This is a pretty major rework of the snapping system.
The GRID_HELPERs now have a separate CONSTRUCTION_MANAGER
which handles some of the state involving "construction
geometry".
This is fed with 'extended' geometry (e.g. "infinite" lines from
segments) for use in generating things like intersection points.
It also handles adding this geoemtry to a GAL view item
(CONSTRUCTION_GEOM) for display to the user.
The process is:
* A TOOL creates a GRID_HELPER
* Optionally, it pre-loads a "persistent" batch of construction
geometry (e.g. for an item's original position)
* The grid helper finds useful snap 'anchors' as before, including
those involving the construction items.
* Other items on the board can be 'activated' by snapping to one
of their main points. Then, if it has construction geometry,
it will be added to the display. At most 2 items of this kind of
geometry are shown, plus the original item, to reduce avoid
too much clutter.
The dashed snap lines state machine is also handled in the
CONSTRUCTION_MANAGER and displayed in the CONSTRUCTION_GEOM item.
Put these in a separate header - they don't need to be available
whenever VECTOR2 is, but they are generic, reusable functions that
can have the corner cases defined and tested.
This is quite fiddly to do in a way that doesn't have wierd
effects, and is shared between ALIGNED and ORTHOGONAL dimensions,
so break it out to a little helper class that handles the
stored state and fiddling with the geometry.
Add direct handling of quadratic beziers to save compute time and number
of points. Update cubic interpolation to reduce number of points
generated for a given smoothness
Cache data on open and used cached data to avoid multiple re-calcs
Remove minimum line length and number of segments and replace with
standard max error level. Allows us to specify the tolerance of bezier
interpolation
Added Distance(VECTOR2) function that returns a double. Removed
superfluous EuclideanNorm, GetLineLength, integer constructor for
EDA_ANGLE (this promotes to double in the CTOR), DistanceLinePoint and
HitTestPoints
Also extended the size for arc calculations that get distances to center
points to avoid overflow
The router preview item can be specific to the part that is being
tuned, rather than the whole net. It's also less visually noisy as
it doesn't dim/undim the rest of the board.
Using kigfx preview items for the status keeps us from having a bunch
of focus issues with the status popup window.
Using a boolean argument just leads to a lot of trailing booleans in the
function calls and is not user friendly. Instead, introduce PostAction()
to send an action that runs after the coroutine (equivalent to passing
false or the default argument), and leave RunAction as the immediate
execution function.
We really don't want to post these events unless the *selected* items
were actually modified, since it results in a redraw of the properties
panel (which disturbs edit state and causes flicker on MSW).
Now the COMMIT system is responsible for sending this event iff the
commit touches items that are selected.
Side note: UpdateMsgPanel is useless on every app except pl_editor, so
it can probably be refactored/removed at some point.
