Merge branch 'DRCPadFanout' into 'master'

DRC tests for fanout width to pad and fanout symmetry for footprints

See merge request kicad/code/kicad!2140

common/drc_rules.keywords

@@ -55,6 +55,10 @@ thermal_relief_gap
 thermal_spoke_width
 track
 track_angle
+pad_fanout_ratio
+pad_fanout_via_distance
+footprint_fanout_mirror_symmetry
+footprint_fanout_point_symmetry
 track_width
 track_segment_length
 version

pcbnew/CMakeLists.txt

@@ -281,6 +281,7 @@ set( PCBNEW_DRC_SRCS
     drc/drc_test_provider_misc.cpp
     drc/drc_test_provider_text_dims.cpp
     drc/drc_test_provider_track_angle.cpp
+    drc/drc_test_provider_fanout_checks.cpp
     drc/drc_test_provider_track_width.cpp
     drc/drc_test_provider_track_segment_length.cpp
     drc/drc_test_provider_zone_connections.cpp

pcbnew/dialogs/panel_setup_rules.cpp

@@ -226,6 +226,7 @@ void PANEL_SETUP_RULES::onScintillaCharAdded( wxStyledTextEvent &aEvent )
         STRUCT_REF
     };
 
+    // clang-format off: suggestion is less maintainable
     auto isDisallowToken =
             []( const wxString& token ) -> bool
             {
@@ -271,10 +272,15 @@ void PANEL_SETUP_RULES::onScintillaCharAdded( wxStyledTextEvent &aEvent )
                     || token == wxT( "track_width" )
                     || token == wxT( "track_angle" )
                     || token == wxT( "track_segment_length" )
+                    || token == wxT( "pad_fanout_ratio" )
+                    || token == wxT( "pad_fanout_via_distance" )
+                    || token == wxT( "footprint_fanout_mirror_symmetry" )
+                    || token == wxT( "footprint_fanout_point_symmetry" )
                     || token == wxT( "via_count" )
                     || token == wxT( "via_diameter" )
                     || token == wxT( "zone_connection" );
             };
+    // clang-format on: suggestion is less maintainable
 
     std::stack<wxString> sexprs;
     wxString             partial;
@@ -492,6 +498,10 @@ void PANEL_SETUP_RULES::onScintillaCharAdded( wxStyledTextEvent &aEvent )
                           "track_width|"
                           "track_angle|"
                           "track_segment_length|"
+                          "pad_fanout_ratio|"
+                          "pad_fanout_via_distance|"
+                          "footprint_fanout_mirror_symmetry|"
+                          "footprint_fanout_point_symmetry|"
                           "via_count|"
                           "via_diameter|"
                           "zone_connection" );

pcbnew/dialogs/panel_setup_rules_help_2constraints.md

@@ -27,6 +27,10 @@
 | `track_width`             | min/opt/max                                                                                                           | Checks the width of track and arc segments.  An error will be generated for each segment that has a width below the `min` value (if specified) or above the `max` value (if specified).<br>                                                                                                                                                                                                                                                             |
 | `track_angle`             | min/opt/max                                                                                                           | Checks the angle between two connected track segments.  An error will be generated for each connected pair with an angle below the `min` value (if specified) or above the `max` value (if specified).<br>                                                                                                                                                                                                                                              |
 | `track_segment_length`    | min/max                                                                                                               | Checks the length of track and arc segments.  An error will be generated for each segment that has a length below the `min` value (if specified) or above the `max` value (if specified).<br>                                                                                                                                                                                                                                                           |
+| `pad_fanout_ratio`        | max                                                                                                                   | Checks the width of the fanout for a pad stated as a percentage of the pad minor axis length.  An error will be generated for each connected track with a width above the `max` value (if specified).<br>                                                                                                                                                                                                                                                                           |
+| `pad_fanout_via_distance`| min                                                                                                                   | Checks the distance from a pad to the next via. Creates an error if the distance is below the min value. <br>                                                                                                                                                                                                                                                                           |
+| `footprint_fanout_mirror_symmetry`  | max                                                                                                                   | Checks the mirror symmetry of the tracks and thermal spokes connected to the pads of a footprint. A maximum value can be used to fine-tune the allowed deviation from perfect symmetry. An error will be generated for the footprint if the deviation is above the `max` value (if specified). <br>                                                                                                                                                          |\n
+| `footprint_fanout_point_symmetry` | max                                                                                                                   | Checks the point symmetry of the tracks and thermal spokes connected to the pads of a footprint. A maximum value can be used to fine-tune the allowed deviation from perfect symmetry. An error will be generated for the footprint if the deviation is above the `max` value (if specified).  <br>                                                                                                            |\n
 | `via_count`               | max                                                                                                                   | Counts the number of vias on every net matched by the rule condition.  If that number exceeds the constraint `max` value on any matched net, an error will be generated for that net.<br>                                                                                                                                                                                                                                                               |
 | `via_dangling`            |                                                                                                                       | Checks for vias that are unconnected or connected on only one layer.  This constraint does not take a min/opt/max value.  In combination with a severity clause, this constraint can be used to allow or disallow dangling vias in various conditions.<br>                                                                                                                                                                                              |
 | `zone_connection`         | `solid`<br>`thermal_reliefs`<br>`none`                                                                                | Specifies the connection to be made between a zone and a pad.<br>                                                                                                                                                                                                                                                                                                                                                                                       |

pcbnew/drc/drc_item.cpp

@@ -129,6 +129,22 @@ DRC_ITEM DRC_ITEM::trackSegmentLength( DRCE_TRACK_SEGMENT_LENGTH,
         _HKI( "Track segment length" ),
         wxT( "track_segment_length" ) );
 
+DRC_ITEM DRC_ITEM::padFanoutRatio( DRCE_PAD_FANOUT_RATIO,
+        _( "Pad fanout ratio" ),
+        wxT( "pad_fanout_ratio" ) );
+
+DRC_ITEM DRC_ITEM::padFanoutViaDistance( DRCE_PAD_FANOUT_VIA_DISTANCE,
+        _( "Pad fanout via distance" ),
+        wxT( "pad_fanout_via_distance" ) );
+
+DRC_ITEM DRC_ITEM::footprintFanoutMirrorSymmetry( DRCE_FOOTPRINT_FANOUT_MIRROR_SYMMETRY,
+        _( "Footprint fanout mirror symmetry" ),
+        wxT( "footprint_fanout_mirror_symmetry" ) );
+
+DRC_ITEM DRC_ITEM::footprintFanoutPointSymmetry( DRCE_FOOTPRINT_FANOUT_POINT_SYMMETRY,
+        _( "Footprint fanout point symmetry" ),
+        wxT( "footprint_fanout_point_symmetry" ) );
+
 DRC_ITEM DRC_ITEM::annularWidth( DRCE_ANNULAR_WIDTH,
         _HKI( "Annular width" ),
         wxT( "annular_width" ) );
@@ -309,40 +325,44 @@ std::vector<std::reference_wrapper<RC_ITEM>> DRC_ITEM::allItemTypes(
             DRC_ITEM::trackDangling,
             DRC_ITEM::starvedThermal,
 
-            DRC_ITEM::heading_DFM,
-            DRC_ITEM::edgeClearance,
-            DRC_ITEM::holeClearance,
-            DRC_ITEM::holeNearHole,
-            DRC_ITEM::holesCoLocated,
-            DRC_ITEM::trackWidth,
-            DRC_ITEM::trackAngle,
-            DRC_ITEM::trackSegmentLength,
-            DRC_ITEM::annularWidth,
-            DRC_ITEM::drillTooSmall,
-            DRC_ITEM::microviaDrillTooSmall,
-            DRC_ITEM::courtyardsOverlap,
-            DRC_ITEM::missingCourtyard,
-            DRC_ITEM::malformedCourtyard,
-            DRC_ITEM::invalidOutline,
-            DRC_ITEM::copperSliver,
-            DRC_ITEM::solderMaskBridge,
-            DRC_ITEM::connectionWidth,
+        DRC_ITEM::heading_DFM,
+        DRC_ITEM::edgeClearance,
+        DRC_ITEM::holeClearance,
+        DRC_ITEM::holeNearHole,
+        DRC_ITEM::holesCoLocated,
+        DRC_ITEM::trackWidth,
+        DRC_ITEM::trackAngle,
+        DRC_ITEM::trackSegmentLength,
+        DRC_ITEM::padFanoutRatio,
+        DRC_ITEM::padFanoutViaDistance,
+        DRC_ITEM::footprintFanoutMirrorSymmetry,
+        DRC_ITEM::footprintFanoutPointSymmetry,
+        DRC_ITEM::annularWidth,
+        DRC_ITEM::drillTooSmall,
+        DRC_ITEM::microviaDrillTooSmall,
+        DRC_ITEM::courtyardsOverlap,
+        DRC_ITEM::missingCourtyard,
+        DRC_ITEM::malformedCourtyard,
+        DRC_ITEM::invalidOutline,
+        DRC_ITEM::copperSliver,
+        DRC_ITEM::solderMaskBridge,
+        DRC_ITEM::connectionWidth,
 
-            DRC_ITEM::heading_schematic_parity,
-            DRC_ITEM::duplicateFootprints,
-            DRC_ITEM::missingFootprint,
-            DRC_ITEM::extraFootprint,
-            DRC_ITEM::schematicParity,
-            DRC_ITEM::footprintFilters,
-            DRC_ITEM::netConflict,
-            DRC_ITEM::unconnectedItems,
+        DRC_ITEM::heading_schematic_parity,
+        DRC_ITEM::duplicateFootprints,
+        DRC_ITEM::missingFootprint,
+        DRC_ITEM::extraFootprint,
+        DRC_ITEM::schematicParity,
+        DRC_ITEM::footprintFilters,
+        DRC_ITEM::netConflict,
+        DRC_ITEM::unconnectedItems,
 
-            DRC_ITEM::heading_signal_integrity,
-            DRC_ITEM::lengthOutOfRange,
-            DRC_ITEM::skewOutOfRange,
-            DRC_ITEM::viaCountOutOfRange,
-            DRC_ITEM::diffPairGapOutOfRange,
-            DRC_ITEM::diffPairUncoupledLengthTooLong,
+        DRC_ITEM::heading_signal_integrity,
+        DRC_ITEM::lengthOutOfRange,
+        DRC_ITEM::skewOutOfRange,
+        DRC_ITEM::viaCountOutOfRange,
+        DRC_ITEM::diffPairGapOutOfRange,
+        DRC_ITEM::diffPairUncoupledLengthTooLong,
 
             DRC_ITEM::heading_readability,
             DRC_ITEM::silkOverlaps,
@@ -380,6 +400,7 @@ std::vector<std::reference_wrapper<RC_ITEM>> DRC_ITEM::allItemTypes(
 
 std::shared_ptr<DRC_ITEM> DRC_ITEM::Create( int aErrorCode )
 {
+    // clang-format off: suggestion is less organised
     switch( aErrorCode )
     {
     case DRCE_UNCONNECTED_ITEMS:        return std::make_shared<DRC_ITEM>( unconnectedItems );
@@ -402,6 +423,10 @@ std::shared_ptr<DRC_ITEM> DRC_ITEM::Create( int aErrorCode )
     case DRCE_TRACK_WIDTH:              return std::make_shared<DRC_ITEM>( trackWidth );
     case DRCE_TRACK_ANGLE:              return std::make_shared<DRC_ITEM>( trackAngle );
     case DRCE_TRACK_SEGMENT_LENGTH:     return std::make_shared<DRC_ITEM>( trackSegmentLength );
+    case DRCE_PAD_FANOUT_RATIO:         return std::make_shared<DRC_ITEM>( padFanoutRatio );
+    case DRCE_PAD_FANOUT_VIA_DISTANCE:  return std::make_shared<DRC_ITEM>( padFanoutViaDistance );
+    case DRCE_FOOTPRINT_FANOUT_MIRROR_SYMMETRY:   return std::make_shared<DRC_ITEM>( footprintFanoutMirrorSymmetry );
+    case DRCE_FOOTPRINT_FANOUT_POINT_SYMMETRY:  return std::make_shared<DRC_ITEM>( footprintFanoutPointSymmetry );
     case DRCE_ANNULAR_WIDTH:            return std::make_shared<DRC_ITEM>( annularWidth );
     case DRCE_DRILL_OUT_OF_RANGE:       return std::make_shared<DRC_ITEM>( drillTooSmall );
     case DRCE_VIA_DIAMETER:             return std::make_shared<DRC_ITEM>( viaDiameter );
@@ -448,6 +473,7 @@ std::shared_ptr<DRC_ITEM> DRC_ITEM::Create( int aErrorCode )
         wxFAIL_MSG( wxT( "Unknown DRC error code" ) );
         return nullptr;
     }
+    // clang-format on: suggestion is less organised
 }
 
 

pcbnew/drc/drc_item.h

@@ -34,7 +34,9 @@ class DRC_TEST_PROVIDER;
 class PCB_MARKER;
 class BOARD;
 
-enum PCB_DRC_CODE {
+// clang-format off: suggestion is less organised
+enum PCB_DRC_CODE
+{
     DRCE_FIRST = 1,
     DRCE_UNCONNECTED_ITEMS = DRCE_FIRST, // items are unconnected
     DRCE_SHORTING_ITEMS,                 // items short two nets but are not a net-tie
@@ -55,6 +57,10 @@ enum PCB_DRC_CODE {
     DRCE_TRACK_WIDTH,                    // Track width is too small or too large
     DRCE_TRACK_ANGLE,                    // Angle between two connected tracks is too small or too large
     DRCE_TRACK_SEGMENT_LENGTH,           // Track segment is too short or too long
+    DRCE_PAD_FANOUT_RATIO,               // The fanout width from a pad is too large as a percentage of pad width
+    DRCE_PAD_FANOUT_VIA_DISTANCE,        // The distance from a pad to the nearest via connected by copper
+    DRCE_FOOTPRINT_FANOUT_MIRROR_SYMMETRY, // The fanout from a footprint should by symmetric.
+    DRCE_FOOTPRINT_FANOUT_POINT_SYMMETRY,  // The fanout from a footprint should by symmetric.
     DRCE_ANNULAR_WIDTH,                  // Via size and drill leave annular ring too small
     DRCE_CONNECTION_WIDTH,               // Net connection too small
     DRCE_DRILL_OUT_OF_RANGE,             // Too small via or pad drill
@@ -111,6 +117,7 @@ enum PCB_DRC_CODE {
 
     DRCE_LAST = DRCE_NONMIRRORED_TEXT_ON_BACK_LAYER
 };
+// clang-format on: suggestion is less organised
 
 
 class DRC_ITEM : public RC_ITEM
@@ -200,6 +207,10 @@ private:
     static DRC_ITEM trackWidth;
     static DRC_ITEM trackAngle;
     static DRC_ITEM trackSegmentLength;
+    static DRC_ITEM padFanoutRatio;
+    static DRC_ITEM padFanoutViaDistance;
+    static DRC_ITEM footprintFanoutMirrorSymmetry;
+    static DRC_ITEM footprintFanoutPointSymmetry;
     static DRC_ITEM annularWidth;
     static DRC_ITEM drillTooSmall;
     static DRC_ITEM viaDiameter;

pcbnew/drc/drc_rule.h

@@ -79,7 +79,11 @@ enum DRC_CONSTRAINT_T
     ASSERTION_CONSTRAINT,
     CONNECTION_WIDTH_CONSTRAINT,
     TRACK_ANGLE_CONSTRAINT,
-    VIA_DANGLING_CONSTRAINT
+    VIA_DANGLING_CONSTRAINT,
+    PAD_FANOUT_RATIO_CONSTRAINT,
+    PAD_FANOUT_VIA_DISTANCE_CONSTRAINT,
+    FOOTPRINT_FANOUT_MIRROR_SYMMETRY_CONSTRAINT,
+    FOOTPRINT_FANOUT_POINT_SYMMETRY_CONSTRAINT,
 };
 
 

pcbnew/drc/drc_rule_parser.cpp

@@ -502,6 +502,7 @@ void DRC_RULES_PARSER::parseConstraint( DRC_RULE* aRule )
         return;
     }
 
+    // clang-format off: suggestion is less organised
     switch( token )
     {
     case T_assertion:                 c.m_Type = ASSERTION_CONSTRAINT;                 break;
@@ -518,6 +519,10 @@ void DRC_RULES_PARSER::parseConstraint( DRC_RULE* aRule )
     case T_track_width:               c.m_Type = TRACK_WIDTH_CONSTRAINT;               break;
     case T_track_angle:               c.m_Type = TRACK_ANGLE_CONSTRAINT;               break;
     case T_track_segment_length:      c.m_Type = TRACK_SEGMENT_LENGTH_CONSTRAINT;      break;
+    case T_pad_fanout_ratio:          c.m_Type = PAD_FANOUT_RATIO_CONSTRAINT;          break;
+    case T_pad_fanout_via_distance:   c.m_Type = PAD_FANOUT_VIA_DISTANCE_CONSTRAINT;   break;
+    case T_footprint_fanout_mirror_symmetry: c.m_Type = FOOTPRINT_FANOUT_MIRROR_SYMMETRY_CONSTRAINT;  break;
+    case T_footprint_fanout_point_symmetry:  c.m_Type = FOOTPRINT_FANOUT_POINT_SYMMETRY_CONSTRAINT;   break;
     case T_connection_width:          c.m_Type = CONNECTION_WIDTH_CONSTRAINT;          break;
     case T_annular_width:             c.m_Type = ANNULAR_WIDTH_CONSTRAINT;             break;
     case T_via_diameter:              c.m_Type = VIA_DIAMETER_CONSTRAINT;              break;
@@ -545,9 +550,10 @@ void DRC_RULES_PARSER::parseConstraint( DRC_RULE* aRule )
                          "disallow, zone_connection, thermal_relief_gap, thermal_spoke_width, "
                          "min_resolved_spokes, solder_mask_expansion, solder_paste_abs_margin, "
                          "solder_paste_rel_margin, length, skew, via_count, via_dangling, via_diameter, "
-                         "diff_pair_gap or diff_pair_uncoupled" ) );
+                         "pad_fanout_ratio, diff_pair_gap or diff_pair_uncoupled" ) );
         reportError( msg );
     }
+    // clang-format on: suggestion is less organised
 
     if( aRule->FindConstraint( c.m_Type ) )
     {
@@ -558,7 +564,10 @@ void DRC_RULES_PARSER::parseConstraint( DRC_RULE* aRule )
     bool unitless = c.m_Type == VIA_COUNT_CONSTRAINT
                     || c.m_Type == MIN_RESOLVED_SPOKES_CONSTRAINT
                     || c.m_Type == TRACK_ANGLE_CONSTRAINT
-                    || c.m_Type == VIA_DANGLING_CONSTRAINT;
+                    || c.m_Type == VIA_DANGLING_CONSTRAINT
+                    || c.m_Type == PAD_FANOUT_RATIO_CONSTRAINT
+                    || c.m_Type == FOOTPRINT_FANOUT_MIRROR_SYMMETRY_CONSTRAINT
+                    || c.m_Type == FOOTPRINT_FANOUT_POINT_SYMMETRY_CONSTRAINT;
 
     allowsTimeDomain = c.m_Type == LENGTH_CONSTRAINT || c.m_Type == SKEW_CONSTRAINT;
 
@@ -920,4 +929,4 @@ SEVERITY DRC_RULES_PARSER::parseSeverity()
         reportError( _( "Missing ')'." ) );
 
     return retVal;
-}
+}

pcbnew/drc/drc_test_provider_fanout_checks.cpp

@@ -0,0 +1,606 @@
+/*
+ * This program source code file is part of KiCad, a free EDA CAD application.
+ *
+ * Copyright (C) 2004-2025 KiCad Developers.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, you may find one here:
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ * or you may search the http://www.gnu.org website for the version 2 license,
+ * or you may write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+#include <cmath>
+#include <thread_pool.h>
+#include "base_units.h"
+#include "core/typeinfo.h"
+#include "geometry/shape_line_chain.h"
+#include "geometry/shape_poly_set.h"
+#include "layer_ids.h"
+#include "math/vector2d.h"
+#include "widgets/report_severity.h"
+#include <pcb_track.h>
+#include <drc/drc_engine.h>
+#include <drc/drc_item.h>
+#include <drc/drc_rule.h>
+#include <drc/drc_test_provider.h>
+#include <pad.h>
+#include <footprint.h>
+#include <math/box2.h>
+#include <connectivity/connectivity_data.h>
+
+
+/*
+    Pad fanout test. Checks the width of tracks connected to a pad.
+    Errors generated:
+    - DRCE_PAD_FANOUT_RATIO
+    - DRCE_PAD_FANOUT_VIA_DISTANCE
+    - DRCE_FOOTPRINT_FANOUT_MIRROR_SYMMETRY
+    - DRCE_FOOTPRINT_FANOUT_POINT_SYMMETRY
+*/
+
+class DRC_TEST_PROVIDER_FANOUT_CHECKS : public DRC_TEST_PROVIDER
+{
+public:
+    DRC_TEST_PROVIDER_FANOUT_CHECKS() {}
+
+    virtual ~DRC_TEST_PROVIDER_FANOUT_CHECKS() {}
+
+    virtual bool Run() override;
+
+    virtual const wxString GetName() const override { return wxT( "pad_fanout" ); };
+};
+
+
+bool DRC_TEST_PROVIDER_FANOUT_CHECKS::Run()
+{
+    if( !m_drcEngine->HasRulesForConstraintType( PAD_FANOUT_RATIO_CONSTRAINT )
+        && !m_drcEngine->HasRulesForConstraintType( FOOTPRINT_FANOUT_MIRROR_SYMMETRY_CONSTRAINT )
+        && !m_drcEngine->HasRulesForConstraintType( FOOTPRINT_FANOUT_POINT_SYMMETRY_CONSTRAINT )
+        && !m_drcEngine->HasRulesForConstraintType( PAD_FANOUT_VIA_DISTANCE_CONSTRAINT ) )
+    {
+        REPORT_AUX( wxT( "No fanout constraints found. Tests not run." ) );
+        return true; // continue with other tests
+    }
+
+    if( !reportPhase( _( "Checking pad fanouts..." ) ) )
+        return false; // DRC cancelled
+
+    auto checkPadViaDistance = [&]( const PAD* pad ) -> bool
+    {
+        if( m_drcEngine->IsCancelled() )
+        {
+            return false;
+        }
+
+        std::shared_ptr<CONNECTIVITY_DATA> connectivity =
+                m_drcEngine->GetBoard()->GetConnectivity();
+
+        std::set<PCB_TRACK*>                              visited;
+        std::queue<std::tuple<PCB_TRACK*, VECTOR2I, int>> next;
+
+        auto constraint = m_drcEngine->EvalRules( PAD_FANOUT_VIA_DISTANCE_CONSTRAINT, pad, nullptr,
+                                                  pad->GetLayer() );
+
+        if( !constraint.m_Value.HasMin() || constraint.GetSeverity() == RPT_SEVERITY_IGNORE )
+            return false;
+
+        int length_limit{ constraint.m_Value.Min() };
+
+        for( auto track : connectivity->GetConnectedTracks( pad ) )
+        {
+            if( track->Type() == PCB_TRACE_T )
+            {
+                auto padOutline = pad->GetEffectivePolygon( track->GetLayer() )->Outline( 0 );
+
+                SHAPE_LINE_CHAIN::INTERSECTIONS intersections;
+
+                padOutline.Intersect( SEG( track->GetStart(), track->GetEnd() ), intersections );
+
+                std::set<VECTOR2I> points;
+
+                for( auto intersection : intersections )
+                {
+                    if( points.contains( intersection.p ) )
+                        continue;
+
+                    points.emplace( intersection.p );
+                }
+
+                for( VECTOR2I p : points )
+                {
+                    next.emplace( track, p, 0 );
+                }
+            }
+        }
+
+        while( !next.empty() )
+        {
+            auto [current, point, length] = next.front();
+            next.pop();
+
+            visited.emplace( current );
+
+            for( auto track : connectivity->GetConnectedTracks( current ) )
+            {
+                std::vector<VECTOR2I> buffer;
+
+                if( track->Type() == PCB_VIA_T )
+                {
+                    if( visited.contains( track ) )
+                        continue;
+
+                    PCB_VIA* via = static_cast<PCB_VIA*>( track );
+
+                    int len = length + ( point - via->GetPosition() ).EuclideanNorm()
+                              - via->GetDrill();
+
+                    if( len < length_limit )
+                    {
+                        visited.emplace( track );
+
+                        std::shared_ptr<DRC_ITEM> drcItem =
+                                DRC_ITEM::Create( DRCE_PAD_FANOUT_VIA_DISTANCE );
+                        wxString msg;
+
+                        msg = formatMsg( _( "(%s min via distance %s; actual %s)" ),
+                                         constraint.GetName(), length_limit, len );
+
+                        drcItem->SetErrorMessage( drcItem->GetErrorText() + wxS( " " ) + msg );
+                        drcItem->SetItems( pad, via );
+                        drcItem->SetViolatingRule( constraint.GetParentRule() );
+
+                        reportViolation( drcItem, pad->GetPosition(), pad->GetLayer() );
+                    }
+                }
+                else if( track->Type() == PCB_ARC_T )
+                {
+                    PCB_ARC* arc = static_cast<PCB_ARC*>( track );
+
+                    SHAPE_ARC arc_shape{ arc->GetStart(), arc->GetMid(), arc->GetEnd(),
+                                         arc->GetWidth() };
+
+                    if( current->Type() == PCB_ARC_T )
+                    {
+                        PCB_ARC*  current_arc = static_cast<PCB_ARC*>( current );
+                        SHAPE_ARC current_arc_shape{ current_arc->GetStart(), current_arc->GetMid(),
+                                                     current_arc->GetEnd(),
+                                                     current_arc->GetWidth() };
+
+                        arc_shape.Intersect( current_arc_shape, &buffer );
+                    }
+                    else
+                    {
+                        arc_shape.IntersectLine( SEG( current->GetStart(), current->GetEnd() ),
+                                                 &buffer );
+                    }
+                }
+                else
+                {
+                    SEG b{ track->GetStart(), track->GetEnd() };
+
+                    if( current->Type() == PCB_ARC_T )
+                    {
+                        PCB_ARC*  current_arc = static_cast<PCB_ARC*>( current );
+                        SHAPE_ARC current_arc_shape{ current_arc->GetStart(), current_arc->GetMid(),
+                                                     current_arc->GetEnd(),
+                                                     current_arc->GetWidth() };
+
+                        current_arc_shape.IntersectLine( b, &buffer );
+                    }
+                    else
+                    {
+                        SEG          a{ current->GetStart(), current->GetEnd() };
+                        OPT_VECTOR2I p = a.Intersect( b );
+
+                        if( !p.has_value() )
+                            continue;
+
+                        buffer.emplace_back( *p );
+                    }
+                }
+
+                if( buffer.empty() )
+                    continue;
+
+                double   shortest = -1;
+                VECTOR2I p;
+
+                for( VECTOR2I c : buffer )
+                {
+                    if( shortest > 0 && c.Distance( point ) >= shortest )
+                        continue;
+                    shortest = c.Distance( point );
+                    p = c;
+                }
+
+                int len = length + shortest;
+
+                if( len > length_limit * 2 )
+                    continue;
+
+                if( visited.contains( track ) )
+                    continue;
+
+                next.emplace( track, p, len );
+            }
+        }
+
+        return true;
+    };
+
+    auto checkPadFanoutRatio = [&]( const PAD* pad ) -> bool
+    {
+        if( m_drcEngine->IsErrorLimitExceeded( DRCE_PAD_FANOUT_RATIO ) )
+        {
+            return false;
+        }
+
+        if( m_drcEngine->IsCancelled() )
+        {
+            return false;
+        }
+
+
+        std::shared_ptr<CONNECTIVITY_DATA> connectivity =
+                m_drcEngine->GetBoard()->GetConnectivity();
+
+
+        for( BOARD_ITEM* other : connectivity->GetConnectedTracks( pad ) )
+        {
+            int      actual;
+            VECTOR2I p0;
+
+            if( other->Type() == PCB_ARC_T )
+            {
+                PCB_ARC* arc = static_cast<PCB_ARC*>( other );
+
+                actual = arc->GetWidth();
+                p0 = arc->GetStart();
+            }
+            else if( other->Type() == PCB_TRACE_T )
+            {
+                PCB_TRACK* track = static_cast<PCB_TRACK*>( other );
+
+                actual = track->GetWidth();
+                p0 = ( track->GetStart() + track->GetEnd() ) / 2;
+            }
+            else
+            {
+                continue;
+            }
+
+            const auto& size_vec = pad->GetSize( other->GetLayer() );
+            int         size = size_vec.x < size_vec.y ? size_vec.x : size_vec.y;
+
+            auto constraint = m_drcEngine->EvalRules( PAD_FANOUT_RATIO_CONSTRAINT, pad, other,
+                                                      other->GetLayer() );
+
+            int constraintWidth = 0;
+
+            if( constraint.GetSeverity() != RPT_SEVERITY_IGNORE )
+            {
+                if( constraint.Value().HasMax() && actual * 100 > constraint.Value().Max() * size )
+                {
+                    constraintWidth =
+                            static_cast<double>( constraint.Value().Max() ) / 100.0 * size;
+
+                    std::shared_ptr<DRC_ITEM> drcItem = DRC_ITEM::Create( DRCE_PAD_FANOUT_RATIO );
+                    wxString                  msg;
+
+                    msg = formatMsg( _( "(%s max fanout width %s; actual %s)" ),
+                                     constraint.GetName(), constraintWidth, actual );
+
+                    drcItem->SetErrorMessage( drcItem->GetErrorText() + wxS( " " ) + msg );
+                    drcItem->SetItems( pad, other );
+                    drcItem->SetViolatingRule( constraint.GetParentRule() );
+
+                    reportViolation( drcItem, p0, other->GetLayer() );
+                }
+            }
+        }
+
+        for( ZONE* zone : m_drcEngine->GetBoard()->Zones() )
+        {
+            for( PCB_LAYER_ID layer : pad->GetLayerSet() )
+            {
+                if( !zone->IsOnLayer( layer ) )
+                    continue;
+
+                if( !zone->GetBoundingBox().Intersects( pad->GetBoundingBox() ) )
+                    continue;
+
+                const std::shared_ptr<SHAPE_POLY_SET>& zoneFill = zone->GetFilledPolysList( layer );
+
+                if( zoneFill->IsEmpty() )
+                    continue;
+
+                auto padOutline = pad->GetEffectivePolygon( layer )->Outline( 0 );
+                auto padBBox = pad->GetBoundingBox();
+
+                int spoke_width =
+                        m_drcEngine->EvalRules( THERMAL_SPOKE_WIDTH_CONSTRAINT, pad, zone, layer )
+                                .m_Value.Min();
+
+                int actual{ 0 };
+
+                for( int jj = 0; jj < zoneFill->OutlineCount(); ++jj )
+                {
+                    std::vector<SHAPE_LINE_CHAIN::INTERSECTION> intersections;
+
+                    // We only need to check for one spoke since the width will be the same for the same zone.
+                    if( zoneFill->Outline( jj ).Intersect( padOutline, intersections, true,
+                                                           &padBBox )
+                        >= 2 )
+                    {
+                        actual = spoke_width;
+                        break;
+                    }
+                }
+
+                const auto& size_vec = pad->GetSize( layer );
+                int         size = size_vec.x < size_vec.y ? size_vec.x : size_vec.y;
+
+                auto constraint =
+                        m_drcEngine->EvalRules( PAD_FANOUT_RATIO_CONSTRAINT, pad, zone, layer );
+
+                int constraintWidth = 0;
+
+                if( constraint.GetSeverity() != RPT_SEVERITY_IGNORE )
+                {
+                    if( constraint.Value().HasMax()
+                        && actual * 100 > constraint.Value().Max() * size )
+                    {
+                        constraintWidth =
+                                static_cast<double>( constraint.Value().Max() ) / 100.0 * size;
+
+                        std::shared_ptr<DRC_ITEM> drcItem =
+                                DRC_ITEM::Create( DRCE_PAD_FANOUT_RATIO );
+                        wxString msg;
+
+                        msg = formatMsg( _( "(%s max fanout width %s; actual %s)" ),
+                                         constraint.GetName(), constraintWidth, actual );
+
+                        drcItem->SetErrorMessage( drcItem->GetErrorText() + wxS( " " ) + msg );
+                        drcItem->SetItems( pad, zone );
+                        drcItem->SetViolatingRule( constraint.GetParentRule() );
+
+                        reportViolation( drcItem, pad->GetPosition(), layer );
+                    }
+                }
+            }
+        }
+
+        return true;
+    };
+
+    auto checkFootprintSymmetry = [&]( const FOOTPRINT* footprint ) -> bool
+    {
+        if( m_drcEngine->IsErrorLimitExceeded( DRCE_FOOTPRINT_FANOUT_MIRROR_SYMMETRY )
+            && m_drcEngine->IsErrorLimitExceeded( DRCE_FOOTPRINT_FANOUT_POINT_SYMMETRY ) )
+        {
+            return false;
+        }
+
+        if( m_drcEngine->IsCancelled() )
+        {
+            return false;
+        }
+
+        // pad fanout symmetry is easiest to be calculated using torque and net force.
+        // Both need to be net zero for the fanout to be symmetric.
+        // Force is calculated using connected width.
+
+        double   torque{ 0 };
+        VECTOR2D force{ 0, 0 };
+
+        for( auto pad : footprint->Pads() )
+        {
+            std::shared_ptr<CONNECTIVITY_DATA> connectivity =
+                    m_drcEngine->GetBoard()->GetConnectivity();
+
+            for( BOARD_ITEM* other : connectivity->GetConnectedTracks( pad ) )
+            {
+                if( other->Type() != PCB_TRACE_T )
+                    continue;
+
+                PCB_TRACK* track = static_cast<PCB_TRACK*>( other );
+
+                const auto shape = pad->GetEffectiveShape( track->GetLayer() );
+
+                VECTOR2D direction = VECTOR2D( track->GetEnd() - track->GetStart() );
+                VECTOR2D p0 = track->GetStart();
+
+                if( !shape->PointInside( track->GetStart() ) )
+                {
+                    if( shape->PointInside( track->GetEnd() ) )
+                    {
+                        p0 = track->GetEnd();
+                        direction = VECTOR2D( track->GetStart() - track->GetEnd() );
+                    }
+                }
+
+                SHAPE_LINE_CHAIN::INTERSECTIONS intersections;
+
+                auto outline = pad->GetEffectivePolygon( track->GetLayer() )->Outline( 0 );
+
+                if( outline.Intersect( SEG( track->GetStart(), track->GetEnd() ), intersections ) )
+                    p0 = intersections[0].p;
+
+                p0 = p0 - footprint->GetPosition();
+
+                direction = direction.Resize( pcbIUScale.IUTomm( track->GetWidth() ) );
+
+                force += direction;
+                torque += pcbIUScale.IUTomm( p0.x ) * direction.y
+                          - pcbIUScale.IUTomm( p0.y ) * direction.x;
+            }
+
+            for( ZONE* zone : m_drcEngine->GetBoard()->Zones() )
+            {
+                for( PCB_LAYER_ID layer : pad->GetLayerSet() )
+                {
+                    if( !zone->IsOnLayer( layer ) )
+                        continue;
+
+                    if( !zone->GetBoundingBox().Intersects( pad->GetBoundingBox() ) )
+                        continue;
+
+                    const std::shared_ptr<SHAPE_POLY_SET>& zoneFill =
+                            zone->GetFilledPolysList( layer );
+
+                    if( zoneFill->IsEmpty() )
+                        continue;
+
+                    auto padOutline = pad->GetEffectivePolygon( layer )->Outline( 0 );
+                    auto padBBox = pad->GetBoundingBox();
+
+                    int spoke_half_width =
+                            m_drcEngine
+                                    ->EvalRules( THERMAL_SPOKE_WIDTH_CONSTRAINT, pad, zone, layer )
+                                    .m_Value.Min()
+                            / 2;
+
+                    for( int jj = 0; jj < zoneFill->OutlineCount(); ++jj )
+                    {
+                        std::vector<SHAPE_LINE_CHAIN::INTERSECTION> intersections;
+
+                        zoneFill->Outline( jj ).Intersect( padOutline, intersections, true,
+                                                           &padBBox );
+
+                        if( intersections.size() < 2 )
+                            continue;
+
+                        std::set<int> our_indices;
+
+                        for( auto intersection : intersections )
+                        {
+                            // Don't double count spoke edges.
+                            if( our_indices.contains( intersection.index_our ) )
+                                continue;
+
+                            our_indices.emplace( intersection.index_our );
+
+                            SEG seg = zoneFill->Outline( jj ).Segment( intersection.index_our );
+                            VECTOR2D direction;
+
+                            if( padOutline.PointInside( seg.A ) )
+                                direction = seg.B - intersection.p;
+                            else
+                                direction = seg.A - intersection.p;
+
+                            direction = direction.Resize( pcbIUScale.IUTomm( spoke_half_width ) );
+
+                            VECTOR2D p0 = intersection.p - footprint->GetPosition();
+
+                            force += direction;
+                            torque += pcbIUScale.IUTomm( p0.x ) * direction.y
+                                      - pcbIUScale.IUTomm( p0.y ) * direction.x;
+                        }
+                    }
+                }
+            }
+        }
+
+        // The "torque" and "force" values are quantities without a clear physical quantity attached.
+        // The factor 1000 is chosen experimentally.
+        int actual_torque = static_cast<int>( std::sqrt( std::abs( torque ) ) * 1000 );
+        int actual_force = static_cast<int>( force.EuclideanNorm() * 1000 );
+
+        auto force_constraint = m_drcEngine->EvalRules( FOOTPRINT_FANOUT_MIRROR_SYMMETRY_CONSTRAINT, footprint, nullptr,
+                                                        footprint->GetLayer() );
+
+        auto torque_constraint = m_drcEngine->EvalRules( FOOTPRINT_FANOUT_POINT_SYMMETRY_CONSTRAINT, footprint, nullptr,
+                                                         footprint->GetLayer() );
+
+        if( force_constraint.m_Value.HasMax() && force_constraint.GetSeverity() != RPT_SEVERITY_IGNORE
+            && !m_drcEngine->IsErrorLimitExceeded( DRCE_FOOTPRINT_FANOUT_MIRROR_SYMMETRY ) )
+        {
+            if( actual_force > force_constraint.m_Value.Max() )
+            {
+                std::shared_ptr<DRC_ITEM> drcItem = DRC_ITEM::Create( DRCE_FOOTPRINT_FANOUT_MIRROR_SYMMETRY );
+                wxString                  msg;
+
+                msg = wxString::Format( _( "(%s fanout mirror asymmetry exceeded %d; actual %d)" ),
+                                        force_constraint.GetName(), force_constraint.m_Value.Max(), actual_force );
+
+                drcItem->SetErrorMessage( drcItem->GetErrorText() + wxS( " " ) + msg );
+                drcItem->SetItems( footprint, nullptr );
+                drcItem->SetViolatingRule( force_constraint.GetParentRule() );
+
+                reportViolation( drcItem, footprint->GetPosition(), footprint->GetLayer() );
+            }
+        }
+        if( torque_constraint.m_Value.HasMax() && torque_constraint.GetSeverity() != RPT_SEVERITY_IGNORE
+            && !m_drcEngine->IsErrorLimitExceeded( DRCE_FOOTPRINT_FANOUT_POINT_SYMMETRY ) )
+        {
+            if( actual_torque > torque_constraint.m_Value.Max() )
+            {
+                std::shared_ptr<DRC_ITEM> drcItem = DRC_ITEM::Create( DRCE_FOOTPRINT_FANOUT_POINT_SYMMETRY );
+                wxString msg;
+
+                msg = wxString::Format( _( "(%s fanout point asymmetry exceeded %d; actual %d)" ),
+                                        torque_constraint.GetName(), torque_constraint.m_Value.Max(), actual_torque );
+
+                drcItem->SetErrorMessage( drcItem->GetErrorText() + wxS( " " ) + msg );
+                drcItem->SetItems( footprint, nullptr );
+                drcItem->SetViolatingRule( torque_constraint.GetParentRule() );
+
+                reportViolation( drcItem, footprint->GetPosition(), footprint->GetLayer() );
+            }
+        }
+
+        return true;
+    };
+
+    const int progressDelta = 250;
+    int       ii = 0;
+
+    thread_pool&                   tp = GetKiCadThreadPool();
+    std::vector<std::future<bool>> returns;
+
+    returns.reserve( m_drcEngine->GetBoard()->GetPads().size()
+                     + m_drcEngine->GetBoard()->Footprints().size() );
+
+    for( PAD* item : m_drcEngine->GetBoard()->GetPads() )
+    {
+        returns.emplace_back( tp.submit( checkPadFanoutRatio, item ) );
+        returns.emplace_back( tp.submit( checkPadViaDistance, item ) );
+    }
+
+    for( FOOTPRINT* item : m_drcEngine->GetBoard()->Footprints() )
+    {
+        returns.emplace_back( tp.submit( checkFootprintSymmetry, item ) );
+    }
+
+    for( std::future<bool>& ret : returns )
+    {
+        std::future_status status = ret.wait_for( std::chrono::milliseconds( 250 ) );
+
+        while( status != std::future_status::ready )
+        {
+            reportProgress( ii++, m_drcEngine->GetBoard()->Tracks().size(), progressDelta );
+            status = ret.wait_for( std::chrono::milliseconds( 250 ) );
+        }
+    }
+
+
+    return !m_drcEngine->IsCancelled();
+}
+
+
+namespace detail
+{
+static DRC_REGISTER_TEST_PROVIDER<DRC_TEST_PROVIDER_FANOUT_CHECKS> dummy;
+}

pcbnew/pcbexpr_evaluator.cpp

@@ -23,6 +23,7 @@
 
 #include "pcbexpr_evaluator.h"
 
+#include "eda_units.h"
 #include <cstdio>
 #include <memory>
 #include <mutex>
@@ -672,8 +673,9 @@ BOARD* PCBEXPR_CONTEXT::GetBoard() const
 const std::vector<wxString>& PCBEXPR_UNIT_RESOLVER::GetSupportedUnits() const
 {
     static const std::vector<wxString> pcbUnits = { wxT( "mil" ), wxT( "mm" ), wxT( "in" ),
-                                                    wxT( "deg" ), wxT( "fs" ), wxT( "ps" ) };
-
+                                                    wxT( "fs" ), wxT( "ps" ),
+                                                    wxT( "deg" ), wxT( "rad" ),
+                                                    wxT( "%" ) };
 
     return pcbUnits;
 }
@@ -681,14 +683,15 @@ const std::vector<wxString>& PCBEXPR_UNIT_RESOLVER::GetSupportedUnits() const
 
 wxString PCBEXPR_UNIT_RESOLVER::GetSupportedUnitsMessage() const
 {
-    return _( "must be mm, in, mil, deg, fs, or ps" );
+    return _( "must be mm, in, mil, fs, ps, deg, rad or %" );
 }
 
 
 const std::vector<EDA_UNITS>& PCBEXPR_UNIT_RESOLVER::GetSupportedUnitsTypes() const
 {
-    static const std::vector<EDA_UNITS> pcbUnits = { EDA_UNITS::MILS,    EDA_UNITS::MM, EDA_UNITS::INCH,
-                                                     EDA_UNITS::DEGREES, EDA_UNITS::FS, EDA_UNITS::PS };
+    static const std::vector<EDA_UNITS> pcbUnits = { EDA_UNITS::MILS,     EDA_UNITS::MM,     EDA_UNITS::INCH,
+                                                     EDA_UNITS::FS,       EDA_UNITS::PS,     EDA_UNITS::DEGREES,
+                                                     EDA_UNITS::UNSCALED, EDA_UNITS::PERCENT };
 
     return pcbUnits;
 }
@@ -703,9 +706,11 @@ double PCBEXPR_UNIT_RESOLVER::Convert( const wxString& aString, int unitId ) con
     case 0: return EDA_UNIT_UTILS::UI::DoubleValueFromString( pcbIUScale, EDA_UNITS::MILS, aString );
     case 1: return EDA_UNIT_UTILS::UI::DoubleValueFromString( pcbIUScale, EDA_UNITS::MM, aString );
     case 2: return EDA_UNIT_UTILS::UI::DoubleValueFromString( pcbIUScale, EDA_UNITS::INCH, aString );
-    case 3: return v;
-    case 4: return EDA_UNIT_UTILS::UI::DoubleValueFromString( pcbIUScale, EDA_UNITS::FS, aString );
-    case 5: return EDA_UNIT_UTILS::UI::DoubleValueFromString( pcbIUScale, EDA_UNITS::PS, aString );
+    case 3: return EDA_UNIT_UTILS::UI::DoubleValueFromString( pcbIUScale, EDA_UNITS::FS, aString );
+    case 4: return EDA_UNIT_UTILS::UI::DoubleValueFromString( pcbIUScale, EDA_UNITS::PS, aString );
+    case 5: return EDA_UNIT_UTILS::UI::DoubleValueFromString( pcbIUScale, EDA_UNITS::DEGREES, aString );
+    case 6: return v;
+    case 7: return EDA_UNIT_UTILS::UI::DoubleValueFromString( pcbIUScale, EDA_UNITS::PERCENT, aString );
     default: return v;
     }
 };

pcbnew/pcbexpr_functions.cpp

@@ -21,6 +21,7 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
  */
 
+#include "core/typeinfo.h"
 #include <algorithm>
 #include <cstdio>
 #include <memory>
@@ -1367,7 +1368,12 @@ static void hasComponentClassFunc( LIBEVAL::CONTEXT* aCtx, void* self )
                     footprint = item->GetParentFootprint();
 
                 if( !footprint )
-                    return 0.0;
+                {
+                    if( item->Type() == PCB_PAD_T )
+                        footprint = dynamic_cast<PAD*>( item )->GetParentFootprint();
+                    else
+                        return 0.0;
+                }
 
                 const COMPONENT_CLASS* compClass = footprint->GetComponentClass();
 

pcbnew/tools/board_inspection_tool.cpp

@@ -21,6 +21,7 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
  */
 
+#include "drc/drc_rule.h"
 #include <bitmaps.h>
 #include <pcb_group.h>
 #include <tool/tool_manager.h>
@@ -310,17 +311,18 @@ wxString BOARD_INSPECTION_TOOL::InspectDRCErrorMenuText( const std::shared_ptr<R
         return menuDescription( PCB_ACTIONS::inspectClearance );
     }
     else if( aDRCItem->GetErrorCode() == DRCE_TEXT_HEIGHT
-            || aDRCItem->GetErrorCode() == DRCE_TEXT_THICKNESS
-            || aDRCItem->GetErrorCode() == DRCE_DIFF_PAIR_UNCOUPLED_LENGTH_TOO_LONG
-            || aDRCItem->GetErrorCode() == DRCE_TRACK_WIDTH
-            || aDRCItem->GetErrorCode() == DRCE_TRACK_ANGLE
-            || aDRCItem->GetErrorCode() == DRCE_TRACK_SEGMENT_LENGTH
-            || aDRCItem->GetErrorCode() == DRCE_VIA_DIAMETER
-            || aDRCItem->GetErrorCode() == DRCE_ANNULAR_WIDTH
-            || aDRCItem->GetErrorCode() == DRCE_DRILL_OUT_OF_RANGE
-            || aDRCItem->GetErrorCode() == DRCE_MICROVIA_DRILL_OUT_OF_RANGE
-            || aDRCItem->GetErrorCode() == DRCE_CONNECTION_WIDTH
-            || aDRCItem->GetErrorCode() == DRCE_ASSERTION_FAILURE )
+             || aDRCItem->GetErrorCode() == DRCE_TEXT_THICKNESS
+             || aDRCItem->GetErrorCode() == DRCE_DIFF_PAIR_UNCOUPLED_LENGTH_TOO_LONG
+             || aDRCItem->GetErrorCode() == DRCE_TRACK_WIDTH
+             || aDRCItem->GetErrorCode() == DRCE_TRACK_ANGLE
+             || aDRCItem->GetErrorCode() == DRCE_TRACK_SEGMENT_LENGTH
+             || aDRCItem->GetErrorCode() == DRCE_PAD_FANOUT_RATIO
+             || aDRCItem->GetErrorCode() == DRCE_VIA_DIAMETER
+             || aDRCItem->GetErrorCode() == DRCE_ANNULAR_WIDTH
+             || aDRCItem->GetErrorCode() == DRCE_DRILL_OUT_OF_RANGE
+             || aDRCItem->GetErrorCode() == DRCE_MICROVIA_DRILL_OUT_OF_RANGE
+             || aDRCItem->GetErrorCode() == DRCE_CONNECTION_WIDTH
+             || aDRCItem->GetErrorCode() == DRCE_ASSERTION_FAILURE )
     {
         return menuDescription( PCB_ACTIONS::inspectConstraints );
     }
@@ -449,6 +451,21 @@ void BOARD_INSPECTION_TOOL::InspectDRCError( const std::shared_ptr<RC_ITEM>& aDR
                                      reportMax( m_frame, constraint ) ) );
         break;
 
+    case DRCE_PAD_FANOUT_RATIO:
+        r = dialog->AddHTMLPage( _( "Pad fanout ratio" ) );
+        reportHeader( _( "Pad fanout ratio resolution for:" ), a, r );
+
+        if( compileError )
+            reportCompileError( r );
+
+        constraint = drcEngine->EvalRules( PAD_FANOUT_RATIO_CONSTRAINT, a, b, layer, r );
+
+        r->Report( "" );
+        r->Report( wxString::Format( _( "Resolved fanout ratio constraints: min %s; max %s." ),
+                                     reportMin( m_frame, constraint ),
+                                     reportMax( m_frame, constraint ) ) );
+        break;
+
     case DRCE_TRACK_ANGLE:
         r = dialog->AddHTMLPage( _( "Track Angle" ) );
         reportHeader( _( "Track Angle resolution for:" ), a, r );

qa/data/pcbnew/fanout_checks/footprint_fanout_combined.kicad_dru

@@ -0,0 +1,9 @@
+(version 1)
+
+(rule "test footprint fanout point symmetry"
+	(constraint footprint_fanout_point_symmetry (max 100))
+)
+
+(rule "test footprint fanout mirror symmetry"
+	(constraint footprint_fanout_mirror_symmetry (max 100))
+)

qa/data/pcbnew/fanout_checks/footprint_fanout_combined.kicad_pro

@@ -0,0 +1,288 @@
+{
+  "board": {
+    "3dviewports": [],
+    "design_settings": {
+      "defaults": {
+        "apply_defaults_to_fp_fields": false,
+        "apply_defaults_to_fp_shapes": false,
+        "apply_defaults_to_fp_text": false,
+        "board_outline_line_width": 0.05,
+        "copper_line_width": 0.2,
+        "copper_text_italic": false,
+        "copper_text_size_h": 1.5,
+        "copper_text_size_v": 1.5,
+        "copper_text_thickness": 0.3,
+        "copper_text_upright": false,
+        "courtyard_line_width": 0.05,
+        "dimension_precision": 4,
+        "dimension_units": 3,
+        "dimensions": {
+          "arrow_length": 1270000,
+          "extension_offset": 500000,
+          "keep_text_aligned": true,
+          "suppress_zeroes": false,
+          "text_position": 0,
+          "units_format": 1
+        },
+        "fab_line_width": 0.1,
+        "fab_text_italic": false,
+        "fab_text_size_h": 1.0,
+        "fab_text_size_v": 1.0,
+        "fab_text_thickness": 0.15,
+        "fab_text_upright": false,
+        "other_line_width": 0.1,
+        "other_text_italic": false,
+        "other_text_size_h": 1.0,
+        "other_text_size_v": 1.0,
+        "other_text_thickness": 0.15,
+        "other_text_upright": false,
+        "pads": {
+          "drill": 0.0,
+          "height": 0.6,
+          "width": 1.575
+        },
+        "silk_line_width": 0.1,
+        "silk_text_italic": false,
+        "silk_text_size_h": 1.0,
+        "silk_text_size_v": 1.0,
+        "silk_text_thickness": 0.1,
+        "silk_text_upright": false,
+        "zones": {
+          "min_clearance": 0.5
+        }
+      },
+      "diff_pair_dimensions": [],
+      "drc_exclusions": [],
+      "meta": {
+        "version": 2
+      },
+      "rule_severities": {
+        "annular_width": "ignore",
+        "clearance": "ignore",
+        "connection_width": "ignore",
+        "copper_edge_clearance": "ignore",
+        "copper_sliver": "ignore",
+        "courtyards_overlap": "ignore",
+        "creepage": "ignore",
+        "diff_pair_gap_out_of_range": "ignore",
+        "diff_pair_uncoupled_length_too_long": "ignore",
+        "drill_out_of_range": "ignore",
+        "duplicate_footprints": "ignore",
+        "extra_footprint": "ignore",
+        "footprint": "ignore",
+        "footprint_fanout_mirror_symmetry": "error",
+        "footprint_fanout_point_symmetry": "error",
+        "footprint_filters_mismatch": "ignore",
+        "footprint_symbol_mismatch": "ignore",
+        "footprint_type_mismatch": "ignore",
+        "hole_clearance": "ignore",
+        "hole_near_hole": "error",
+        "hole_to_hole": "ignore",
+        "holes_co_located": "ignore",
+        "invalid_outline": "ignore",
+        "isolated_copper": "ignore",
+        "item_on_disabled_layer": "ignore",
+        "items_not_allowed": "ignore",
+        "length_out_of_range": "ignore",
+        "lib_footprint_issues": "ignore",
+        "lib_footprint_mismatch": "ignore",
+        "malformed_courtyard": "ignore",
+        "microvia_drill_out_of_range": "ignore",
+        "mirrored_text_on_front_layer": "ignore",
+        "missing_courtyard": "ignore",
+        "missing_footprint": "ignore",
+        "net_conflict": "ignore",
+        "nonmirrored_text_on_back_layer": "ignore",
+        "npth_inside_courtyard": "ignore",
+        "pad_fanout_ratio": "ignore",
+        "pad_fanout_via_distance": "ignore",
+        "padstack": "ignore",
+        "pth_inside_courtyard": "ignore",
+        "shorting_items": "ignore",
+        "silk_edge_clearance": "ignore",
+        "silk_over_copper": "ignore",
+        "silk_overlap": "ignore",
+        "skew_out_of_range": "ignore",
+        "solder_mask_bridge": "ignore",
+        "starved_thermal": "ignore",
+        "text_height": "ignore",
+        "text_thickness": "ignore",
+        "through_hole_pad_without_hole": "ignore",
+        "too_many_vias": "ignore",
+        "track_angle": "ignore",
+        "track_dangling": "ignore",
+        "track_segment_length": "ignore",
+        "track_width": "ignore",
+        "tracks_crossing": "ignore",
+        "unconnected_items": "ignore",
+        "unresolved_variable": "ignore",
+        "via_dangling": "ignore",
+        "zones_intersect": "ignore"
+      },
+      "rules": {
+        "max_error": 0.005,
+        "min_clearance": 0.0,
+        "min_connection": 0.0,
+        "min_copper_edge_clearance": 0.5,
+        "min_groove_width": 0.0,
+        "min_hole_clearance": 0.25,
+        "min_hole_to_hole": 0.25,
+        "min_microvia_diameter": 0.2,
+        "min_microvia_drill": 0.1,
+        "min_resolved_spokes": 1,
+        "min_silk_clearance": 0.0,
+        "min_text_height": 0.8,
+        "min_text_thickness": 0.08,
+        "min_through_hole_diameter": 0.3,
+        "min_track_width": 0.0,
+        "min_via_annular_width": 0.1,
+        "min_via_diameter": 0.5,
+        "solder_mask_to_copper_clearance": 0.0,
+        "use_height_for_length_calcs": true
+      },
+      "teardrop_options": [
+        {
+          "td_onpthpad": true,
+          "td_onroundshapesonly": false,
+          "td_onsmdpad": true,
+          "td_ontrackend": false,
+          "td_onvia": true
+        }
+      ],
+      "teardrop_parameters": [
+        {
+          "td_allow_use_two_tracks": true,
+          "td_curve_segcount": 0,
+          "td_height_ratio": 1.0,
+          "td_length_ratio": 0.5,
+          "td_maxheight": 2.0,
+          "td_maxlen": 1.0,
+          "td_on_pad_in_zone": false,
+          "td_target_name": "td_round_shape",
+          "td_width_to_size_filter_ratio": 0.9
+        },
+        {
+          "td_allow_use_two_tracks": true,
+          "td_curve_segcount": 0,
+          "td_height_ratio": 1.0,
+          "td_length_ratio": 0.5,
+          "td_maxheight": 2.0,
+          "td_maxlen": 1.0,
+          "td_on_pad_in_zone": false,
+          "td_target_name": "td_rect_shape",
+          "td_width_to_size_filter_ratio": 0.9
+        },
+        {
+          "td_allow_use_two_tracks": true,
+          "td_curve_segcount": 0,
+          "td_height_ratio": 1.0,
+          "td_length_ratio": 0.5,
+          "td_maxheight": 2.0,
+          "td_maxlen": 1.0,
+          "td_on_pad_in_zone": false,
+          "td_target_name": "td_track_end",
+          "td_width_to_size_filter_ratio": 0.9
+        }
+      ],
+      "track_widths": [],
+      "tuning_pattern_settings": {
+        "diff_pair_defaults": {
+          "corner_radius_percentage": 80,
+          "corner_style": 1,
+          "max_amplitude": 1.0,
+          "min_amplitude": 0.2,
+          "single_sided": false,
+          "spacing": 1.0
+        },
+        "diff_pair_skew_defaults": {
+          "corner_radius_percentage": 80,
+          "corner_style": 1,
+          "max_amplitude": 1.0,
+          "min_amplitude": 0.2,
+          "single_sided": false,
+          "spacing": 0.6
+        },
+        "single_track_defaults": {
+          "corner_radius_percentage": 80,
+          "corner_style": 1,
+          "max_amplitude": 1.0,
+          "min_amplitude": 0.2,
+          "single_sided": false,
+          "spacing": 0.6
+        }
+      },
+      "via_dimensions": [],
+      "zones_allow_external_fillets": false
+    },
+    "ipc2581": {
+      "dist": "",
+      "distpn": "",
+      "internal_id": "",
+      "mfg": "",
+      "mpn": ""
+    },
+    "layer_pairs": [],
+    "layer_presets": [],
+    "viewports": []
+  },
+  "boards": [],
+  "cvpcb": {
+    "equivalence_files": []
+  },
+  "libraries": {
+    "pinned_footprint_libs": [],
+    "pinned_symbol_libs": []
+  },
+  "meta": {
+    "filename": "footprint_fanout_combined.kicad_pro",
+    "version": 3
+  },
+  "net_settings": {
+    "classes": [
+      {
+        "bus_width": 12,
+        "clearance": 0.2,
+        "diff_pair_gap": 0.25,
+        "diff_pair_via_gap": 0.25,
+        "diff_pair_width": 0.2,
+        "line_style": 0,
+        "microvia_diameter": 0.3,
+        "microvia_drill": 0.1,
+        "name": "Default",
+        "pcb_color": "rgba(0, 0, 0, 0.000)",
+        "priority": 2147483647,
+        "schematic_color": "rgba(0, 0, 0, 0.000)",
+        "track_width": 0.2,
+        "via_diameter": 0.6,
+        "via_drill": 0.3,
+        "wire_width": 6
+      }
+    ],
+    "meta": {
+      "version": 4
+    },
+    "net_colors": null,
+    "netclass_assignments": null,
+    "netclass_patterns": []
+  },
+  "pcbnew": {
+    "last_paths": {
+      "gencad": "",
+      "idf": "",
+      "netlist": "",
+      "plot": "",
+      "pos_files": "",
+      "specctra_dsn": "",
+      "step": "",
+      "svg": "",
+      "vrml": ""
+    },
+    "page_layout_descr_file": ""
+  },
+  "schematic": {
+    "legacy_lib_dir": "",
+    "legacy_lib_list": []
+  },
+  "sheets": [],
+  "text_variables": {}
+}

qa/data/pcbnew/fanout_checks/footprint_fanout_mirror_symmetry.kicad_dru

@@ -0,0 +1,5 @@
+(version 1)
+
+(rule "test footprint fanout mirror symmetry"
+	(constraint footprint_fanout_mirror_symmetry (max 100))
+)

qa/data/pcbnew/fanout_checks/footprint_fanout_mirror_symmetry.kicad_pro

@@ -0,0 +1,288 @@
+{
+  "board": {
+    "3dviewports": [],
+    "design_settings": {
+      "defaults": {
+        "apply_defaults_to_fp_fields": false,
+        "apply_defaults_to_fp_shapes": false,
+        "apply_defaults_to_fp_text": false,
+        "board_outline_line_width": 0.05,
+        "copper_line_width": 0.2,
+        "copper_text_italic": false,
+        "copper_text_size_h": 1.5,
+        "copper_text_size_v": 1.5,
+        "copper_text_thickness": 0.3,
+        "copper_text_upright": false,
+        "courtyard_line_width": 0.05,
+        "dimension_precision": 4,
+        "dimension_units": 3,
+        "dimensions": {
+          "arrow_length": 1270000,
+          "extension_offset": 500000,
+          "keep_text_aligned": true,
+          "suppress_zeroes": false,
+          "text_position": 0,
+          "units_format": 1
+        },
+        "fab_line_width": 0.1,
+        "fab_text_italic": false,
+        "fab_text_size_h": 1.0,
+        "fab_text_size_v": 1.0,
+        "fab_text_thickness": 0.15,
+        "fab_text_upright": false,
+        "other_line_width": 0.1,
+        "other_text_italic": false,
+        "other_text_size_h": 1.0,
+        "other_text_size_v": 1.0,
+        "other_text_thickness": 0.15,
+        "other_text_upright": false,
+        "pads": {
+          "drill": 0.0,
+          "height": 1.4,
+          "width": 1.025
+        },
+        "silk_line_width": 0.1,
+        "silk_text_italic": false,
+        "silk_text_size_h": 1.0,
+        "silk_text_size_v": 1.0,
+        "silk_text_thickness": 0.1,
+        "silk_text_upright": false,
+        "zones": {
+          "min_clearance": 0.5
+        }
+      },
+      "diff_pair_dimensions": [],
+      "drc_exclusions": [],
+      "meta": {
+        "version": 2
+      },
+      "rule_severities": {
+        "annular_width": "ignore",
+        "clearance": "ignore",
+        "connection_width": "ignore",
+        "copper_edge_clearance": "ignore",
+        "copper_sliver": "ignore",
+        "courtyards_overlap": "ignore",
+        "creepage": "ignore",
+        "diff_pair_gap_out_of_range": "ignore",
+        "diff_pair_uncoupled_length_too_long": "ignore",
+        "drill_out_of_range": "ignore",
+        "duplicate_footprints": "ignore",
+        "extra_footprint": "ignore",
+        "footprint": "ignore",
+        "footprint_fanout_mirror_symmetry": "error",
+        "footprint_fanout_torque": "ignore",
+        "footprint_filters_mismatch": "ignore",
+        "footprint_symbol_mismatch": "ignore",
+        "footprint_type_mismatch": "ignore",
+        "hole_clearance": "ignore",
+        "hole_near_hole": "error",
+        "hole_to_hole": "ignore",
+        "holes_co_located": "ignore",
+        "invalid_outline": "ignore",
+        "isolated_copper": "ignore",
+        "item_on_disabled_layer": "ignore",
+        "items_not_allowed": "ignore",
+        "length_out_of_range": "ignore",
+        "lib_footprint_issues": "ignore",
+        "lib_footprint_mismatch": "ignore",
+        "malformed_courtyard": "ignore",
+        "microvia_drill_out_of_range": "ignore",
+        "mirrored_text_on_front_layer": "ignore",
+        "missing_courtyard": "ignore",
+        "missing_footprint": "ignore",
+        "net_conflict": "ignore",
+        "nonmirrored_text_on_back_layer": "ignore",
+        "npth_inside_courtyard": "ignore",
+        "pad_fanout_ratio": "ignore",
+        "pad_fanout_via_distance": "ignore",
+        "padstack": "ignore",
+        "pth_inside_courtyard": "ignore",
+        "shorting_items": "ignore",
+        "silk_edge_clearance": "ignore",
+        "silk_over_copper": "ignore",
+        "silk_overlap": "ignore",
+        "skew_out_of_range": "ignore",
+        "solder_mask_bridge": "ignore",
+        "starved_thermal": "ignore",
+        "text_height": "ignore",
+        "text_thickness": "ignore",
+        "through_hole_pad_without_hole": "ignore",
+        "too_many_vias": "ignore",
+        "track_angle": "ignore",
+        "track_dangling": "ignore",
+        "track_segment_length": "ignore",
+        "track_width": "ignore",
+        "tracks_crossing": "ignore",
+        "unconnected_items": "ignore",
+        "unresolved_variable": "ignore",
+        "via_dangling": "ignore",
+        "zones_intersect": "ignore"
+      },
+      "rules": {
+        "max_error": 0.005,
+        "min_clearance": 0.0,
+        "min_connection": 0.0,
+        "min_copper_edge_clearance": 0.5,
+        "min_groove_width": 0.0,
+        "min_hole_clearance": 0.25,
+        "min_hole_to_hole": 0.25,
+        "min_microvia_diameter": 0.2,
+        "min_microvia_drill": 0.1,
+        "min_resolved_spokes": 1,
+        "min_silk_clearance": 0.0,
+        "min_text_height": 0.8,
+        "min_text_thickness": 0.08,
+        "min_through_hole_diameter": 0.3,
+        "min_track_width": 0.0,
+        "min_via_annular_width": 0.1,
+        "min_via_diameter": 0.5,
+        "solder_mask_to_copper_clearance": 0.0,
+        "use_height_for_length_calcs": true
+      },
+      "teardrop_options": [
+        {
+          "td_onpthpad": true,
+          "td_onroundshapesonly": false,
+          "td_onsmdpad": true,
+          "td_ontrackend": false,
+          "td_onvia": true
+        }
+      ],
+      "teardrop_parameters": [
+        {
+          "td_allow_use_two_tracks": true,
+          "td_curve_segcount": 0,
+          "td_height_ratio": 1.0,
+          "td_length_ratio": 0.5,
+          "td_maxheight": 2.0,
+          "td_maxlen": 1.0,
+          "td_on_pad_in_zone": false,
+          "td_target_name": "td_round_shape",
+          "td_width_to_size_filter_ratio": 0.9
+        },
+        {
+          "td_allow_use_two_tracks": true,
+          "td_curve_segcount": 0,
+          "td_height_ratio": 1.0,
+          "td_length_ratio": 0.5,
+          "td_maxheight": 2.0,
+          "td_maxlen": 1.0,
+          "td_on_pad_in_zone": false,
+          "td_target_name": "td_rect_shape",
+          "td_width_to_size_filter_ratio": 0.9
+        },
+        {
+          "td_allow_use_two_tracks": true,
+          "td_curve_segcount": 0,
+          "td_height_ratio": 1.0,
+          "td_length_ratio": 0.5,
+          "td_maxheight": 2.0,
+          "td_maxlen": 1.0,
+          "td_on_pad_in_zone": false,
+          "td_target_name": "td_track_end",
+          "td_width_to_size_filter_ratio": 0.9
+        }
+      ],
+      "track_widths": [],
+      "tuning_pattern_settings": {
+        "diff_pair_defaults": {
+          "corner_radius_percentage": 80,
+          "corner_style": 1,
+          "max_amplitude": 1.0,
+          "min_amplitude": 0.2,
+          "single_sided": false,
+          "spacing": 1.0
+        },
+        "diff_pair_skew_defaults": {
+          "corner_radius_percentage": 80,
+          "corner_style": 1,
+          "max_amplitude": 1.0,
+          "min_amplitude": 0.2,
+          "single_sided": false,
+          "spacing": 0.6
+        },
+        "single_track_defaults": {
+          "corner_radius_percentage": 80,
+          "corner_style": 1,
+          "max_amplitude": 1.0,
+          "min_amplitude": 0.2,
+          "single_sided": false,
+          "spacing": 0.6
+        }
+      },
+      "via_dimensions": [],
+      "zones_allow_external_fillets": false
+    },
+    "ipc2581": {
+      "dist": "",
+      "distpn": "",
+      "internal_id": "",
+      "mfg": "",
+      "mpn": ""
+    },
+    "layer_pairs": [],
+    "layer_presets": [],
+    "viewports": []
+  },
+  "boards": [],
+  "cvpcb": {
+    "equivalence_files": []
+  },
+  "libraries": {
+    "pinned_footprint_libs": [],
+    "pinned_symbol_libs": []
+  },
+  "meta": {
+    "filename": "footprint_fanout_mirror_symmetry.kicad_pro",
+    "version": 3
+  },
+  "net_settings": {
+    "classes": [
+      {
+        "bus_width": 12,
+        "clearance": 0.2,
+        "diff_pair_gap": 0.25,
+        "diff_pair_via_gap": 0.25,
+        "diff_pair_width": 0.2,
+        "line_style": 0,
+        "microvia_diameter": 0.3,
+        "microvia_drill": 0.1,
+        "name": "Default",
+        "pcb_color": "rgba(0, 0, 0, 0.000)",
+        "priority": 2147483647,
+        "schematic_color": "rgba(0, 0, 0, 0.000)",
+        "track_width": 0.2,
+        "via_diameter": 0.6,
+        "via_drill": 0.3,
+        "wire_width": 6
+      }
+    ],
+    "meta": {
+      "version": 4
+    },
+    "net_colors": null,
+    "netclass_assignments": null,
+    "netclass_patterns": []
+  },
+  "pcbnew": {
+    "last_paths": {
+      "gencad": "",
+      "idf": "",
+      "netlist": "",
+      "plot": "",
+      "pos_files": "",
+      "specctra_dsn": "",
+      "step": "",
+      "svg": "",
+      "vrml": ""
+    },
+    "page_layout_descr_file": ""
+  },
+  "schematic": {
+    "legacy_lib_dir": "",
+    "legacy_lib_list": []
+  },
+  "sheets": [],
+  "text_variables": {}
+}

qa/data/pcbnew/fanout_checks/footprint_fanout_point_symmetry.kicad_dru

@@ -0,0 +1,5 @@
+(version 1)
+
+(rule "test footprint fanout point symmetry"
+	(constraint footprint_fanout_point_symmetry (max 100))
+)

qa/data/pcbnew/fanout_checks/footprint_fanout_point_symmetry.kicad_pro

@@ -0,0 +1,288 @@
+{
+  "board": {
+    "3dviewports": [],
+    "design_settings": {
+      "defaults": {
+        "apply_defaults_to_fp_fields": false,
+        "apply_defaults_to_fp_shapes": false,
+        "apply_defaults_to_fp_text": false,
+        "board_outline_line_width": 0.05,
+        "copper_line_width": 0.2,
+        "copper_text_italic": false,
+        "copper_text_size_h": 1.5,
+        "copper_text_size_v": 1.5,
+        "copper_text_thickness": 0.3,
+        "copper_text_upright": false,
+        "courtyard_line_width": 0.05,
+        "dimension_precision": 4,
+        "dimension_units": 3,
+        "dimensions": {
+          "arrow_length": 1270000,
+          "extension_offset": 500000,
+          "keep_text_aligned": true,
+          "suppress_zeroes": false,
+          "text_position": 0,
+          "units_format": 1
+        },
+        "fab_line_width": 0.1,
+        "fab_text_italic": false,
+        "fab_text_size_h": 1.0,
+        "fab_text_size_v": 1.0,
+        "fab_text_thickness": 0.15,
+        "fab_text_upright": false,
+        "other_line_width": 0.1,
+        "other_text_italic": false,
+        "other_text_size_h": 1.0,
+        "other_text_size_v": 1.0,
+        "other_text_thickness": 0.15,
+        "other_text_upright": false,
+        "pads": {
+          "drill": 0.0,
+          "height": 1.4,
+          "width": 1.025
+        },
+        "silk_line_width": 0.1,
+        "silk_text_italic": false,
+        "silk_text_size_h": 1.0,
+        "silk_text_size_v": 1.0,
+        "silk_text_thickness": 0.1,
+        "silk_text_upright": false,
+        "zones": {
+          "min_clearance": 0.5
+        }
+      },
+      "diff_pair_dimensions": [],
+      "drc_exclusions": [],
+      "meta": {
+        "version": 2
+      },
+      "rule_severities": {
+        "annular_width": "ignore",
+        "clearance": "ignore",
+        "connection_width": "ignore",
+        "copper_edge_clearance": "ignore",
+        "copper_sliver": "ignore",
+        "courtyards_overlap": "ignore",
+        "creepage": "ignore",
+        "diff_pair_gap_out_of_range": "ignore",
+        "diff_pair_uncoupled_length_too_long": "ignore",
+        "drill_out_of_range": "ignore",
+        "duplicate_footprints": "ignore",
+        "extra_footprint": "ignore",
+        "footprint": "ignore",
+        "footprint_fanout_mirror_symmetry": "ignore",
+        "footprint_fanout_point_symmetry": "error",
+        "footprint_filters_mismatch": "ignore",
+        "footprint_symbol_mismatch": "ignore",
+        "footprint_type_mismatch": "ignore",
+        "hole_clearance": "ignore",
+        "hole_near_hole": "error",
+        "hole_to_hole": "ignore",
+        "holes_co_located": "ignore",
+        "invalid_outline": "ignore",
+        "isolated_copper": "ignore",
+        "item_on_disabled_layer": "ignore",
+        "items_not_allowed": "ignore",
+        "length_out_of_range": "ignore",
+        "lib_footprint_issues": "ignore",
+        "lib_footprint_mismatch": "ignore",
+        "malformed_courtyard": "ignore",
+        "microvia_drill_out_of_range": "ignore",
+        "mirrored_text_on_front_layer": "ignore",
+        "missing_courtyard": "ignore",
+        "missing_footprint": "ignore",
+        "net_conflict": "ignore",
+        "nonmirrored_text_on_back_layer": "ignore",
+        "npth_inside_courtyard": "ignore",
+        "pad_fanout_ratio": "ignore",
+        "pad_fanout_via_distance": "ignore",
+        "padstack": "ignore",
+        "pth_inside_courtyard": "ignore",
+        "shorting_items": "ignore",
+        "silk_edge_clearance": "ignore",
+        "silk_over_copper": "ignore",
+        "silk_overlap": "ignore",
+        "skew_out_of_range": "ignore",
+        "solder_mask_bridge": "ignore",
+        "starved_thermal": "ignore",
+        "text_height": "ignore",
+        "text_thickness": "ignore",
+        "through_hole_pad_without_hole": "ignore",
+        "too_many_vias": "ignore",
+        "track_angle": "ignore",
+        "track_dangling": "ignore",
+        "track_segment_length": "ignore",
+        "track_width": "ignore",
+        "tracks_crossing": "ignore",
+        "unconnected_items": "ignore",
+        "unresolved_variable": "ignore",
+        "via_dangling": "ignore",
+        "zones_intersect": "ignore"
+      },
+      "rules": {
+        "max_error": 0.005,
+        "min_clearance": 0.0,
+        "min_connection": 0.0,
+        "min_copper_edge_clearance": 0.5,
+        "min_groove_width": 0.0,
+        "min_hole_clearance": 0.25,
+        "min_hole_to_hole": 0.25,
+        "min_microvia_diameter": 0.2,
+        "min_microvia_drill": 0.1,
+        "min_resolved_spokes": 2,
+        "min_silk_clearance": 0.0,
+        "min_text_height": 0.8,
+        "min_text_thickness": 0.08,
+        "min_through_hole_diameter": 0.3,
+        "min_track_width": 0.0,
+        "min_via_annular_width": 0.1,
+        "min_via_diameter": 0.5,
+        "solder_mask_to_copper_clearance": 0.0,
+        "use_height_for_length_calcs": true
+      },
+      "teardrop_options": [
+        {
+          "td_onpthpad": true,
+          "td_onroundshapesonly": false,
+          "td_onsmdpad": true,
+          "td_ontrackend": false,
+          "td_onvia": true
+        }
+      ],
+      "teardrop_parameters": [
+        {
+          "td_allow_use_two_tracks": true,
+          "td_curve_segcount": 0,
+          "td_height_ratio": 1.0,
+          "td_length_ratio": 0.5,
+          "td_maxheight": 2.0,
+          "td_maxlen": 1.0,
+          "td_on_pad_in_zone": false,
+          "td_target_name": "td_round_shape",
+          "td_width_to_size_filter_ratio": 0.9
+        },
+        {
+          "td_allow_use_two_tracks": true,
+          "td_curve_segcount": 0,
+          "td_height_ratio": 1.0,
+          "td_length_ratio": 0.5,
+          "td_maxheight": 2.0,
+          "td_maxlen": 1.0,
+          "td_on_pad_in_zone": false,
+          "td_target_name": "td_rect_shape",
+          "td_width_to_size_filter_ratio": 0.9
+        },
+        {
+          "td_allow_use_two_tracks": true,
+          "td_curve_segcount": 0,
+          "td_height_ratio": 1.0,
+          "td_length_ratio": 0.5,
+          "td_maxheight": 2.0,
+          "td_maxlen": 1.0,
+          "td_on_pad_in_zone": false,
+          "td_target_name": "td_track_end",
+          "td_width_to_size_filter_ratio": 0.9
+        }
+      ],
+      "track_widths": [],
+      "tuning_pattern_settings": {
+        "diff_pair_defaults": {
+          "corner_radius_percentage": 80,
+          "corner_style": 1,
+          "max_amplitude": 1.0,
+          "min_amplitude": 0.2,
+          "single_sided": false,
+          "spacing": 1.0
+        },
+        "diff_pair_skew_defaults": {
+          "corner_radius_percentage": 80,
+          "corner_style": 1,
+          "max_amplitude": 1.0,
+          "min_amplitude": 0.2,
+          "single_sided": false,
+          "spacing": 0.6
+        },
+        "single_track_defaults": {
+          "corner_radius_percentage": 80,
+          "corner_style": 1,
+          "max_amplitude": 1.0,
+          "min_amplitude": 0.2,
+          "single_sided": false,
+          "spacing": 0.6
+        }
+      },
+      "via_dimensions": [],
+      "zones_allow_external_fillets": false
+    },
+    "ipc2581": {
+      "dist": "",
+      "distpn": "",
+      "internal_id": "",
+      "mfg": "",
+      "mpn": ""
+    },
+    "layer_pairs": [],
+    "layer_presets": [],
+    "viewports": []
+  },
+  "boards": [],
+  "cvpcb": {
+    "equivalence_files": []
+  },
+  "libraries": {
+    "pinned_footprint_libs": [],
+    "pinned_symbol_libs": []
+  },
+  "meta": {
+    "filename": "footprint_fanout_point_symmetry.kicad_pro",
+    "version": 3
+  },
+  "net_settings": {
+    "classes": [
+      {
+        "bus_width": 12,
+        "clearance": 0.2,
+        "diff_pair_gap": 0.25,
+        "diff_pair_via_gap": 0.25,
+        "diff_pair_width": 0.2,
+        "line_style": 0,
+        "microvia_diameter": 0.3,
+        "microvia_drill": 0.1,
+        "name": "Default",
+        "pcb_color": "rgba(0, 0, 0, 0.000)",
+        "priority": 2147483647,
+        "schematic_color": "rgba(0, 0, 0, 0.000)",
+        "track_width": 0.2,
+        "via_diameter": 0.6,
+        "via_drill": 0.3,
+        "wire_width": 6
+      }
+    ],
+    "meta": {
+      "version": 4
+    },
+    "net_colors": null,
+    "netclass_assignments": null,
+    "netclass_patterns": []
+  },
+  "pcbnew": {
+    "last_paths": {
+      "gencad": "",
+      "idf": "",
+      "netlist": "",
+      "plot": "",
+      "pos_files": "",
+      "specctra_dsn": "",
+      "step": "",
+      "svg": "",
+      "vrml": ""
+    },
+    "page_layout_descr_file": ""
+  },
+  "schematic": {
+    "legacy_lib_dir": "",
+    "legacy_lib_list": []
+  },
+  "sheets": [],
+  "text_variables": {}
+}

qa/data/pcbnew/fanout_checks/pad_fanout_ratio.kicad_dru

@@ -0,0 +1,5 @@
+(version 1)
+
+(rule "test pad fanout ratio"
+	(constraint pad_fanout_ratio (max 45%))
+)

qa/data/pcbnew/fanout_checks/pad_fanout_ratio.kicad_pro

@@ -0,0 +1,301 @@
+{
+  "board": {
+    "3dviewports": [],
+    "design_settings": {
+      "defaults": {
+        "apply_defaults_to_fp_fields": false,
+        "apply_defaults_to_fp_shapes": false,
+        "apply_defaults_to_fp_text": false,
+        "board_outline_line_width": 0.05,
+        "copper_line_width": 0.2,
+        "copper_text_italic": false,
+        "copper_text_size_h": 1.5,
+        "copper_text_size_v": 1.5,
+        "copper_text_thickness": 0.3,
+        "copper_text_upright": false,
+        "courtyard_line_width": 0.05,
+        "dimension_precision": 4,
+        "dimension_units": 3,
+        "dimensions": {
+          "arrow_length": 1270000,
+          "extension_offset": 500000,
+          "keep_text_aligned": true,
+          "suppress_zeroes": false,
+          "text_position": 0,
+          "units_format": 1
+        },
+        "fab_line_width": 0.1,
+        "fab_text_italic": false,
+        "fab_text_size_h": 1.0,
+        "fab_text_size_v": 1.0,
+        "fab_text_thickness": 0.15,
+        "fab_text_upright": false,
+        "other_line_width": 0.1,
+        "other_text_italic": false,
+        "other_text_size_h": 1.0,
+        "other_text_size_v": 1.0,
+        "other_text_thickness": 0.15,
+        "other_text_upright": false,
+        "pads": {
+          "drill": 0.0,
+          "height": 1.4,
+          "width": 1.025
+        },
+        "silk_line_width": 0.1,
+        "silk_text_italic": false,
+        "silk_text_size_h": 1.0,
+        "silk_text_size_v": 1.0,
+        "silk_text_thickness": 0.1,
+        "silk_text_upright": false,
+        "zones": {
+          "min_clearance": 0.5
+        }
+      },
+      "diff_pair_dimensions": [
+        {
+          "gap": 0.0,
+          "via_gap": 0.0,
+          "width": 0.0
+        }
+      ],
+      "drc_exclusions": [],
+      "meta": {
+        "version": 2
+      },
+      "rule_severities": {
+        "annular_width": "ignore",
+        "clearance": "ignore",
+        "connection_width": "ignore",
+        "copper_edge_clearance": "ignore",
+        "copper_sliver": "ignore",
+        "courtyards_overlap": "ignore",
+        "creepage": "ignore",
+        "diff_pair_gap_out_of_range": "ignore",
+        "diff_pair_uncoupled_length_too_long": "ignore",
+        "drill_out_of_range": "ignore",
+        "duplicate_footprints": "ignore",
+        "extra_footprint": "ignore",
+        "footprint": "ignore",
+        "footprint_fanout_mirror_symmetry": "ignore",
+        "footprint_fanout_point_symmetry": "ignore",
+        "footprint_filters_mismatch": "ignore",
+        "footprint_symbol_mismatch": "ignore",
+        "footprint_type_mismatch": "ignore",
+        "hole_clearance": "ignore",
+        "hole_near_hole": "error",
+        "hole_to_hole": "ignore",
+        "holes_co_located": "ignore",
+        "invalid_outline": "ignore",
+        "isolated_copper": "ignore",
+        "item_on_disabled_layer": "ignore",
+        "items_not_allowed": "ignore",
+        "length_out_of_range": "ignore",
+        "lib_footprint_issues": "ignore",
+        "lib_footprint_mismatch": "ignore",
+        "malformed_courtyard": "ignore",
+        "microvia_drill_out_of_range": "ignore",
+        "mirrored_text_on_front_layer": "ignore",
+        "missing_courtyard": "ignore",
+        "missing_footprint": "ignore",
+        "net_conflict": "ignore",
+        "nonmirrored_text_on_back_layer": "ignore",
+        "npth_inside_courtyard": "ignore",
+        "pad_fanout_ratio": "error",
+        "pad_fanout_via_distance": "ignore",
+        "padstack": "ignore",
+        "pth_inside_courtyard": "ignore",
+        "shorting_items": "ignore",
+        "silk_edge_clearance": "ignore",
+        "silk_over_copper": "ignore",
+        "silk_overlap": "ignore",
+        "skew_out_of_range": "ignore",
+        "solder_mask_bridge": "ignore",
+        "starved_thermal": "ignore",
+        "text_height": "ignore",
+        "text_thickness": "ignore",
+        "through_hole_pad_without_hole": "ignore",
+        "too_many_vias": "ignore",
+        "track_angle": "ignore",
+        "track_dangling": "ignore",
+        "track_segment_length": "ignore",
+        "track_width": "ignore",
+        "tracks_crossing": "ignore",
+        "unconnected_items": "ignore",
+        "unresolved_variable": "ignore",
+        "via_dangling": "ignore",
+        "zones_intersect": "ignore"
+      },
+      "rules": {
+        "max_error": 0.005,
+        "min_clearance": 0.0,
+        "min_connection": 0.0,
+        "min_copper_edge_clearance": 0.5,
+        "min_groove_width": 0.0,
+        "min_hole_clearance": 0.25,
+        "min_hole_to_hole": 0.25,
+        "min_microvia_diameter": 0.2,
+        "min_microvia_drill": 0.1,
+        "min_resolved_spokes": 2,
+        "min_silk_clearance": 0.0,
+        "min_text_height": 0.8,
+        "min_text_thickness": 0.08,
+        "min_through_hole_diameter": 0.3,
+        "min_track_width": 0.0,
+        "min_via_annular_width": 0.1,
+        "min_via_diameter": 0.5,
+        "solder_mask_to_copper_clearance": 0.0,
+        "use_height_for_length_calcs": true
+      },
+      "teardrop_options": [
+        {
+          "td_onpthpad": true,
+          "td_onroundshapesonly": false,
+          "td_onsmdpad": true,
+          "td_ontrackend": false,
+          "td_onvia": true
+        }
+      ],
+      "teardrop_parameters": [
+        {
+          "td_allow_use_two_tracks": true,
+          "td_curve_segcount": 0,
+          "td_height_ratio": 1.0,
+          "td_length_ratio": 0.5,
+          "td_maxheight": 2.0,
+          "td_maxlen": 1.0,
+          "td_on_pad_in_zone": false,
+          "td_target_name": "td_round_shape",
+          "td_width_to_size_filter_ratio": 0.9
+        },
+        {
+          "td_allow_use_two_tracks": true,
+          "td_curve_segcount": 0,
+          "td_height_ratio": 1.0,
+          "td_length_ratio": 0.5,
+          "td_maxheight": 2.0,
+          "td_maxlen": 1.0,
+          "td_on_pad_in_zone": false,
+          "td_target_name": "td_rect_shape",
+          "td_width_to_size_filter_ratio": 0.9
+        },
+        {
+          "td_allow_use_two_tracks": true,
+          "td_curve_segcount": 0,
+          "td_height_ratio": 1.0,
+          "td_length_ratio": 0.5,
+          "td_maxheight": 2.0,
+          "td_maxlen": 1.0,
+          "td_on_pad_in_zone": false,
+          "td_target_name": "td_track_end",
+          "td_width_to_size_filter_ratio": 0.9
+        }
+      ],
+      "track_widths": [
+        0.0
+      ],
+      "tuning_pattern_settings": {
+        "diff_pair_defaults": {
+          "corner_radius_percentage": 80,
+          "corner_style": 1,
+          "max_amplitude": 1.0,
+          "min_amplitude": 0.2,
+          "single_sided": false,
+          "spacing": 1.0
+        },
+        "diff_pair_skew_defaults": {
+          "corner_radius_percentage": 80,
+          "corner_style": 1,
+          "max_amplitude": 1.0,
+          "min_amplitude": 0.2,
+          "single_sided": false,
+          "spacing": 0.6
+        },
+        "single_track_defaults": {
+          "corner_radius_percentage": 80,
+          "corner_style": 1,
+          "max_amplitude": 1.0,
+          "min_amplitude": 0.2,
+          "single_sided": false,
+          "spacing": 0.6
+        }
+      },
+      "via_dimensions": [
+        {
+          "diameter": 0.0,
+          "drill": 0.0
+        }
+      ],
+      "zones_allow_external_fillets": false
+    },
+    "ipc2581": {
+      "dist": "",
+      "distpn": "",
+      "internal_id": "",
+      "mfg": "",
+      "mpn": ""
+    },
+    "layer_pairs": [],
+    "layer_presets": [],
+    "viewports": []
+  },
+  "boards": [],
+  "cvpcb": {
+    "equivalence_files": []
+  },
+  "libraries": {
+    "pinned_footprint_libs": [],
+    "pinned_symbol_libs": []
+  },
+  "meta": {
+    "filename": "pad_fanout_ratio.kicad_pro",
+    "version": 3
+  },
+  "net_settings": {
+    "classes": [
+      {
+        "bus_width": 12,
+        "clearance": 0.2,
+        "diff_pair_gap": 0.25,
+        "diff_pair_via_gap": 0.25,
+        "diff_pair_width": 0.2,
+        "line_style": 0,
+        "microvia_diameter": 0.3,
+        "microvia_drill": 0.1,
+        "name": "Default",
+        "pcb_color": "rgba(0, 0, 0, 0.000)",
+        "priority": 2147483647,
+        "schematic_color": "rgba(0, 0, 0, 0.000)",
+        "track_width": 0.2,
+        "via_diameter": 0.6,
+        "via_drill": 0.3,
+        "wire_width": 6
+      }
+    ],
+    "meta": {
+      "version": 4
+    },
+    "net_colors": null,
+    "netclass_assignments": null,
+    "netclass_patterns": []
+  },
+  "pcbnew": {
+    "last_paths": {
+      "gencad": "",
+      "idf": "",
+      "netlist": "",
+      "plot": "",
+      "pos_files": "",
+      "specctra_dsn": "",
+      "step": "",
+      "svg": "",
+      "vrml": ""
+    },
+    "page_layout_descr_file": ""
+  },
+  "schematic": {
+    "legacy_lib_dir": "",
+    "legacy_lib_list": []
+  },
+  "sheets": [],
+  "text_variables": {}
+}

qa/data/pcbnew/fanout_checks/pad_fanout_via_distance.kicad_dru

@@ -0,0 +1,5 @@
+(version 1)
+
+(rule "test pad fanout length"
+	(constraint pad_fanout_via_distance (min 1mm))
+)

qa/data/pcbnew/fanout_checks/pad_fanout_via_distance.kicad_pcb

@@ -0,0 +1,741 @@
+(kicad_pcb
+	(version 20241229)
+	(generator "pcbnew")
+	(generator_version "9.99")
+	(general
+		(thickness 1.6)
+		(legacy_teardrops no)
+	)
+	(paper "A4")
+	(layers
+		(0 "F.Cu" signal)
+		(2 "B.Cu" signal)
+		(9 "F.Adhes" user "F.Adhesive")
+		(11 "B.Adhes" user "B.Adhesive")
+		(13 "F.Paste" user)
+		(15 "B.Paste" user)
+		(5 "F.SilkS" user "F.Silkscreen")
+		(7 "B.SilkS" user "B.Silkscreen")
+		(1 "F.Mask" user)
+		(3 "B.Mask" user)
+		(17 "Dwgs.User" user "User.Drawings")
+		(19 "Cmts.User" user "User.Comments")
+		(21 "Eco1.User" user "User.Eco1")
+		(23 "Eco2.User" user "User.Eco2")
+		(25 "Edge.Cuts" user)
+		(27 "Margin" user)
+		(31 "F.CrtYd" user "F.Courtyard")
+		(29 "B.CrtYd" user "B.Courtyard")
+		(35 "F.Fab" user)
+		(33 "B.Fab" user)
+		(39 "User.1" user)
+		(41 "User.2" user)
+		(43 "User.3" user)
+		(45 "User.4" user)
+		(47 "User.5" user)
+		(49 "User.6" user)
+		(51 "User.7" user)
+		(53 "User.8" user)
+		(55 "User.9" user)
+	)
+	(setup
+		(stackup
+			(layer "F.SilkS"
+				(type "Top Silk Screen")
+			)
+			(layer "F.Paste"
+				(type "Top Solder Paste")
+			)
+			(layer "F.Mask"
+				(type "Top Solder Mask")
+				(thickness 0.01)
+			)
+			(layer "F.Cu"
+				(type "copper")
+				(thickness 0.035)
+			)
+			(layer "dielectric 1"
+				(type "core")
+				(thickness 1.51)
+				(material "FR4")
+				(epsilon_r 4.5)
+				(loss_tangent 0.02)
+			)
+			(layer "B.Cu"
+				(type "copper")
+				(thickness 0.035)
+			)
+			(layer "B.Mask"
+				(type "Bottom Solder Mask")
+				(thickness 0.01)
+			)
+			(layer "B.Paste"
+				(type "Bottom Solder Paste")
+			)
+			(layer "B.SilkS"
+				(type "Bottom Silk Screen")
+			)
+			(copper_finish "None")
+			(dielectric_constraints no)
+		)
+		(pad_to_mask_clearance 0)
+		(allow_soldermask_bridges_in_footprints no)
+		(tenting front back)
+		(pcbplotparams
+			(layerselection 0x00000000_00000000_55555555_5755f5ff)
+			(plot_on_all_layers_selection 0x00000000_00000000_00000000_00000000)
+			(disableapertmacros no)
+			(usegerberextensions no)
+			(usegerberattributes yes)
+			(usegerberadvancedattributes yes)
+			(creategerberjobfile yes)
+			(dashed_line_dash_ratio 12.000000)
+			(dashed_line_gap_ratio 3.000000)
+			(svgprecision 4)
+			(plotframeref no)
+			(mode 1)
+			(useauxorigin no)
+			(hpglpennumber 1)
+			(hpglpenspeed 20)
+			(hpglpendiameter 15.000000)
+			(pdf_front_fp_property_popups yes)
+			(pdf_back_fp_property_popups yes)
+			(pdf_metadata yes)
+			(pdf_single_document no)
+			(dxfpolygonmode yes)
+			(dxfimperialunits yes)
+			(dxfusepcbnewfont yes)
+			(psnegative no)
+			(psa4output no)
+			(plot_black_and_white yes)
+			(plotinvisibletext no)
+			(sketchpadsonfab no)
+			(plotpadnumbers no)
+			(hidednponfab no)
+			(sketchdnponfab yes)
+			(crossoutdnponfab yes)
+			(subtractmaskfromsilk no)
+			(outputformat 1)
+			(mirror no)
+			(drillshape 1)
+			(scaleselection 1)
+			(outputdirectory "")
+		)
+	)
+	(net 0 "")
+	(net 1 "a")
+	(net 2 "b")
+	(footprint "Resistor_SMD:R_0805_2012Metric"
+		(layer "F.Cu")
+		(uuid "55007e31-7536-4ac1-a51a-ac7eeb872e88")
+		(at 115 120)
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+		(tags "resistor")
+		(property "Reference" "REF**"
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+		(pad "1" smd roundrect
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+			(layers "F.Cu" "F.Mask" "F.Paste")
+			(roundrect_rratio 0.243902)
+			(net 2 "b")
+			(uuid "073f6d2f-5a52-4842-937e-38e4e0653d3b")
+		)
+		(pad "2" smd roundrect
+			(at 0.9125 0)
+			(size 1.025 1.4)
+			(layers "F.Cu" "F.Mask" "F.Paste")
+			(roundrect_rratio 0.243902)
+			(net 2 "b")
+			(uuid "c16a197f-ac4c-4484-84b9-8c132414a58f")
+		)
+		(embedded_fonts no)
+		(model "${KICAD8_3DMODEL_DIR}/Resistor_SMD.3dshapes/R_0805_2012Metric.wrl"
+			(offset
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+			)
+			(scale
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+			(rotate
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+		)
+	)
+	(footprint "Resistor_SMD:R_0805_2012Metric"
+		(layer "F.Cu")
+		(uuid "95804b84-291a-4d91-b270-fc874932a705")
+		(at 115 115)
+		(descr "Resistor SMD 0805 (2012 Metric), square (rectangular) end terminal, IPC_7351 nominal, (Body size source: IPC-SM-782 page 72, https://www.pcb-3d.com/wordpress/wp-content/uploads/ipc-sm-782a_amendment_1_and_2.pdf), generated with kicad-footprint-generator")
+		(tags "resistor")
+		(property "Reference" "REF**"
+			(at 0 -1.65 0)
+			(layer "F.SilkS")
+			(hide yes)
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+		(property "Datasheet" ""
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+			(unlocked yes)
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+					(thickness 0.15)
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+			(end 0.227064 -0.735)
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+		)
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+			(layers "F.Cu" "F.Mask" "F.Paste")
+			(roundrect_rratio 0.243902)
+			(net 1 "a")
+			(uuid "bd2a90a2-d53e-4f5f-baea-886a12d2cdf9")
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+		(pad "2" smd roundrect
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+			(layers "F.Cu" "F.Mask" "F.Paste")
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+			(net 1 "a")
+			(uuid "a5178535-c334-4d2a-8f1a-37bb469733b1")
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+		(embedded_fonts no)
+		(model "${KICAD8_3DMODEL_DIR}/Resistor_SMD.3dshapes/R_0805_2012Metric.wrl"
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+			)
+			(scale
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+			)
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+	)
+	(gr_line
+		(start 130 150)
+		(end 100 150)
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+			(type default)
+		)
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+		(uuid "6fb7d833-f07b-4c6b-8cc4-4f516667c624")
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+	)
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+	)
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+		(end 117 115)
+		(width 0.381)
+		(layer "F.Cu")
+		(net 1)
+		(uuid "1ab94135-e54e-405a-b68a-597cdd3f46d6")
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+		(end 112.5 115)
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+		(end 112.5 113)
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+		(end 117.5 113.5)
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+		(layer "F.Cu")
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+		(end 115.9125 120)
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+		(layer "F.Cu")
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+		(end 113 120)
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+		(end 117.4 119.2)
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+		(layer "F.Cu")
+		(net 2)
+		(uuid "fd74fe00-db48-44ab-b69b-1e34506debb0")
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+	(via
+		(at 116.3 118.8)
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+		(drill 0.3)
+		(layers "F.Cu" "B.Cu")
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+		(uuid "61d09800-fe0b-4c58-ae05-f6f9d7fd639a")
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+	(via
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+		(layers "F.Cu" "B.Cu")
+		(net 2)
+		(uuid "8938687d-21dc-47dc-b99b-361f13186405")
+	)
+	(embedded_fonts no)
+)

qa/data/pcbnew/fanout_checks/pad_fanout_via_distance.kicad_pro

@@ -0,0 +1,288 @@
+{
+  "board": {
+    "3dviewports": [],
+    "design_settings": {
+      "defaults": {
+        "apply_defaults_to_fp_fields": false,
+        "apply_defaults_to_fp_shapes": false,
+        "apply_defaults_to_fp_text": false,
+        "board_outline_line_width": 0.05,
+        "copper_line_width": 0.2,
+        "copper_text_italic": false,
+        "copper_text_size_h": 1.5,
+        "copper_text_size_v": 1.5,
+        "copper_text_thickness": 0.3,
+        "copper_text_upright": false,
+        "courtyard_line_width": 0.05,
+        "dimension_precision": 4,
+        "dimension_units": 3,
+        "dimensions": {
+          "arrow_length": 1270000,
+          "extension_offset": 500000,
+          "keep_text_aligned": true,
+          "suppress_zeroes": false,
+          "text_position": 0,
+          "units_format": 1
+        },
+        "fab_line_width": 0.1,
+        "fab_text_italic": false,
+        "fab_text_size_h": 1.0,
+        "fab_text_size_v": 1.0,
+        "fab_text_thickness": 0.15,
+        "fab_text_upright": false,
+        "other_line_width": 0.1,
+        "other_text_italic": false,
+        "other_text_size_h": 1.0,
+        "other_text_size_v": 1.0,
+        "other_text_thickness": 0.15,
+        "other_text_upright": false,
+        "pads": {
+          "drill": 0.0,
+          "height": 1.4,
+          "width": 1.025
+        },
+        "silk_line_width": 0.1,
+        "silk_text_italic": false,
+        "silk_text_size_h": 1.0,
+        "silk_text_size_v": 1.0,
+        "silk_text_thickness": 0.1,
+        "silk_text_upright": false,
+        "zones": {
+          "min_clearance": 0.5
+        }
+      },
+      "diff_pair_dimensions": [],
+      "drc_exclusions": [],
+      "meta": {
+        "version": 2
+      },
+      "rule_severities": {
+        "annular_width": "ignore",
+        "clearance": "ignore",
+        "connection_width": "ignore",
+        "copper_edge_clearance": "ignore",
+        "copper_sliver": "ignore",
+        "courtyards_overlap": "ignore",
+        "creepage": "ignore",
+        "diff_pair_gap_out_of_range": "ignore",
+        "diff_pair_uncoupled_length_too_long": "ignore",
+        "drill_out_of_range": "ignore",
+        "duplicate_footprints": "ignore",
+        "extra_footprint": "ignore",
+        "footprint": "ignore",
+        "footprint_fanout_mirror_symmetry": "ignore",
+        "footprint_fanout_point_symmetry": "ignore",
+        "footprint_filters_mismatch": "ignore",
+        "footprint_symbol_mismatch": "ignore",
+        "footprint_type_mismatch": "ignore",
+        "hole_clearance": "ignore",
+        "hole_near_hole": "error",
+        "hole_to_hole": "ignore",
+        "holes_co_located": "ignore",
+        "invalid_outline": "ignore",
+        "isolated_copper": "ignore",
+        "item_on_disabled_layer": "ignore",
+        "items_not_allowed": "ignore",
+        "length_out_of_range": "ignore",
+        "lib_footprint_issues": "ignore",
+        "lib_footprint_mismatch": "ignore",
+        "malformed_courtyard": "ignore",
+        "microvia_drill_out_of_range": "ignore",
+        "mirrored_text_on_front_layer": "ignore",
+        "missing_courtyard": "ignore",
+        "missing_footprint": "ignore",
+        "net_conflict": "ignore",
+        "nonmirrored_text_on_back_layer": "ignore",
+        "npth_inside_courtyard": "ignore",
+        "pad_fanout_ratio": "ignore",
+        "pad_fanout_via_distance": "error",
+        "padstack": "ignore",
+        "pth_inside_courtyard": "ignore",
+        "shorting_items": "ignore",
+        "silk_edge_clearance": "ignore",
+        "silk_over_copper": "ignore",
+        "silk_overlap": "ignore",
+        "skew_out_of_range": "ignore",
+        "solder_mask_bridge": "ignore",
+        "starved_thermal": "ignore",
+        "text_height": "ignore",
+        "text_thickness": "ignore",
+        "through_hole_pad_without_hole": "ignore",
+        "too_many_vias": "ignore",
+        "track_angle": "ignore",
+        "track_dangling": "ignore",
+        "track_segment_length": "ignore",
+        "track_width": "ignore",
+        "tracks_crossing": "ignore",
+        "unconnected_items": "ignore",
+        "unresolved_variable": "ignore",
+        "via_dangling": "ignore",
+        "zones_intersect": "ignore"
+      },
+      "rules": {
+        "max_error": 0.005,
+        "min_clearance": 0.0,
+        "min_connection": 0.0,
+        "min_copper_edge_clearance": 0.5,
+        "min_groove_width": 0.0,
+        "min_hole_clearance": 0.25,
+        "min_hole_to_hole": 0.25,
+        "min_microvia_diameter": 0.2,
+        "min_microvia_drill": 0.1,
+        "min_resolved_spokes": 2,
+        "min_silk_clearance": 0.0,
+        "min_text_height": 0.8,
+        "min_text_thickness": 0.08,
+        "min_through_hole_diameter": 0.3,
+        "min_track_width": 0.0,
+        "min_via_annular_width": 0.1,
+        "min_via_diameter": 0.5,
+        "solder_mask_to_copper_clearance": 0.0,
+        "use_height_for_length_calcs": true
+      },
+      "teardrop_options": [
+        {
+          "td_onpthpad": true,
+          "td_onroundshapesonly": false,
+          "td_onsmdpad": true,
+          "td_ontrackend": false,
+          "td_onvia": true
+        }
+      ],
+      "teardrop_parameters": [
+        {
+          "td_allow_use_two_tracks": true,
+          "td_curve_segcount": 0,
+          "td_height_ratio": 1.0,
+          "td_length_ratio": 0.5,
+          "td_maxheight": 2.0,
+          "td_maxlen": 1.0,
+          "td_on_pad_in_zone": false,
+          "td_target_name": "td_round_shape",
+          "td_width_to_size_filter_ratio": 0.9
+        },
+        {
+          "td_allow_use_two_tracks": true,
+          "td_curve_segcount": 0,
+          "td_height_ratio": 1.0,
+          "td_length_ratio": 0.5,
+          "td_maxheight": 2.0,
+          "td_maxlen": 1.0,
+          "td_on_pad_in_zone": false,
+          "td_target_name": "td_rect_shape",
+          "td_width_to_size_filter_ratio": 0.9
+        },
+        {
+          "td_allow_use_two_tracks": true,
+          "td_curve_segcount": 0,
+          "td_height_ratio": 1.0,
+          "td_length_ratio": 0.5,
+          "td_maxheight": 2.0,
+          "td_maxlen": 1.0,
+          "td_on_pad_in_zone": false,
+          "td_target_name": "td_track_end",
+          "td_width_to_size_filter_ratio": 0.9
+        }
+      ],
+      "track_widths": [],
+      "tuning_pattern_settings": {
+        "diff_pair_defaults": {
+          "corner_radius_percentage": 80,
+          "corner_style": 1,
+          "max_amplitude": 1.0,
+          "min_amplitude": 0.2,
+          "single_sided": false,
+          "spacing": 1.0
+        },
+        "diff_pair_skew_defaults": {
+          "corner_radius_percentage": 80,
+          "corner_style": 1,
+          "max_amplitude": 1.0,
+          "min_amplitude": 0.2,
+          "single_sided": false,
+          "spacing": 0.6
+        },
+        "single_track_defaults": {
+          "corner_radius_percentage": 80,
+          "corner_style": 1,
+          "max_amplitude": 1.0,
+          "min_amplitude": 0.2,
+          "single_sided": false,
+          "spacing": 0.6
+        }
+      },
+      "via_dimensions": [],
+      "zones_allow_external_fillets": false
+    },
+    "ipc2581": {
+      "dist": "",
+      "distpn": "",
+      "internal_id": "",
+      "mfg": "",
+      "mpn": ""
+    },
+    "layer_pairs": [],
+    "layer_presets": [],
+    "viewports": []
+  },
+  "boards": [],
+  "cvpcb": {
+    "equivalence_files": []
+  },
+  "libraries": {
+    "pinned_footprint_libs": [],
+    "pinned_symbol_libs": []
+  },
+  "meta": {
+    "filename": "pad_fanout_via_distance.kicad_pro",
+    "version": 3
+  },
+  "net_settings": {
+    "classes": [
+      {
+        "bus_width": 12,
+        "clearance": 0.2,
+        "diff_pair_gap": 0.25,
+        "diff_pair_via_gap": 0.25,
+        "diff_pair_width": 0.2,
+        "line_style": 0,
+        "microvia_diameter": 0.3,
+        "microvia_drill": 0.1,
+        "name": "Default",
+        "pcb_color": "rgba(0, 0, 0, 0.000)",
+        "priority": 2147483647,
+        "schematic_color": "rgba(0, 0, 0, 0.000)",
+        "track_width": 0.2,
+        "via_diameter": 0.6,
+        "via_drill": 0.3,
+        "wire_width": 6
+      }
+    ],
+    "meta": {
+      "version": 4
+    },
+    "net_colors": null,
+    "netclass_assignments": null,
+    "netclass_patterns": []
+  },
+  "pcbnew": {
+    "last_paths": {
+      "gencad": "",
+      "idf": "",
+      "netlist": "",
+      "plot": "",
+      "pos_files": "",
+      "specctra_dsn": "",
+      "step": "",
+      "svg": "",
+      "vrml": ""
+    },
+    "page_layout_descr_file": ""
+  },
+  "schematic": {
+    "legacy_lib_dir": "",
+    "legacy_lib_list": []
+  },
+  "sheets": [],
+  "text_variables": {}
+}

qa/tests/pcbnew/CMakeLists.txt

@@ -75,6 +75,7 @@ set( QA_PCBNEW_SRCS
     drc/test_drc_lengths.cpp
     drc/test_drc_unconnected_items_exclusion_loss.cpp
     drc/test_drc_via_dangling.cpp
+    drc/test_drc_fanout_checks.cpp
 
     pcb_io/altium/test_altium_rule_transformer.cpp
     pcb_io/altium/test_altium_pcblib_import.cpp

qa/tests/pcbnew/drc/test_drc_fanout_checks.cpp

@@ -0,0 +1,104 @@
+/*
+ * This program source code file is part of KiCad, a free EDA CAD application.
+ *
+ * Copyright The KiCad Developers, see AUTHORS.txt for contributors.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, you may find one here:
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ * or you may search the http://www.gnu.org website for the version 2 license,
+ * or you may write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+#include <qa_utils/wx_utils/unit_test_utils.h>
+#include <pcbnew_utils/board_test_utils.h>
+#include <board.h>
+#include <board_design_settings.h>
+#include <pad.h>
+#include <pcb_track.h>
+#include <pcb_marker.h>
+#include <footprint.h>
+#include <drc/drc_item.h>
+#include <settings/settings_manager.h>
+
+
+struct DRC_REGRESSION_TEST_FIXTURE
+{
+    // clang-format off
+    DRC_REGRESSION_TEST_FIXTURE() :
+            m_settingsManager( true /* headless */ )
+    { }
+    // clang-format on
+
+    SETTINGS_MANAGER       m_settingsManager;
+    std::unique_ptr<BOARD> m_board;
+};
+
+
+BOOST_FIXTURE_TEST_CASE( DRCFanoutChecks, DRC_REGRESSION_TEST_FIXTURE )
+{
+    // Check for errors in pad and footprint fanout.
+
+    // clang-format off
+    std::vector<std::pair<wxString, int>> tests =
+    {
+        { "fanout_checks/pad_fanout_ratio", 4 },
+        { "fanout_checks/footprint_fanout_combined", 8 },
+        { "fanout_checks/footprint_fanout_point_symmetry", 4 },
+        { "fanout_checks/footprint_fanout_mirror_symmetry", 4 },
+        { "fanout_checks/pad_fanout_via_distance", 2 },
+    };
+    // clang-format on
+
+    for( const std::pair<wxString, int>& test : tests )
+    {
+        KI_TEST::LoadBoard( m_settingsManager, test.first, m_board );
+        KI_TEST::FillZones( m_board.get() );
+
+        std::vector<DRC_ITEM>  violations;
+        BOARD_DESIGN_SETTINGS& bds = m_board->GetDesignSettings();
+
+        bds.m_DRCEngine->SetViolationHandler(
+                [&]( const std::shared_ptr<DRC_ITEM>& aItem, VECTOR2I aPos, int aLayer,
+                     DRC_CUSTOM_MARKER_HANDLER* aCustomHandler )
+                {
+                    if( bds.GetSeverity( aItem->GetErrorCode() ) == SEVERITY::RPT_SEVERITY_ERROR )
+                        violations.push_back( *aItem );
+                } );
+
+        bds.m_DRCEngine->RunTests( EDA_UNITS::MM, true, false );
+
+        if( violations.size() == test.second )
+        {
+            BOOST_CHECK_EQUAL( 1, 1 ); // quiet "did not check any assertions" warning
+            BOOST_TEST_MESSAGE( wxString::Format( "DRC skew: %s, passed", test.first ) );
+        }
+        else
+        {
+            UNITS_PROVIDER unitsProvider( pcbIUScale, EDA_UNITS::INCH );
+
+            std::map<KIID, EDA_ITEM*> itemMap;
+            m_board->FillItemMap( itemMap );
+
+            for( const DRC_ITEM& item : violations )
+            {
+                BOOST_TEST_MESSAGE(
+                        item.ShowReport( &unitsProvider, RPT_SEVERITY_ERROR, itemMap ) );
+            }
+
+            BOOST_ERROR( wxString::Format( "DRC skew: %s, failed (violations found %d expected %d)",
+                                           test.first, (int) violations.size(), test.second ) );
+        }
+    }
+}