This makes it easier to control what snap points you are aiming for
without accidentally activating objects just by mousing near them
on the way to somewhere else.
When working near snap anchors, which come and go
rapidly, it's often useful to see what snaps have been
calculated. Add an advanced config to show these
(EnableSnapAnchorsDebug) on an overlay layer.
With more polish this could be a hotkey or something.
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.
The disable grid hotkey should allow the snap scale to be completely
determined by the snapSize and world scale. This prevents snapRange
from overriding in the case where grid is disabled.
Additionally, we disallow grid snapping when the grid scale is not
visible. This means that when zoomed out sufficiently to not show the
minor ticks, these minor ticks will not override a snap
Fixes https://gitlab.com/kicad/code/kicad/issues/12303
The automatic wire tool was not working in the gridless mode because the
grid snapping on/off logic present in `EE_GRID_HELPER`, based on the
value of `m_enableGrid`, was not taking into account that another check,
but for the global KiCad setting, would be performed in the `Align()`
method, which is inherited from `GRID_HELPER`.
I've modified all tests of `m_enableGrid` value to also take the global
setting into account, and moved checks for it to `Align()` method, as
it's more consistent this way.
I've also removed an override of the `Align()` method in the
`PCB_GRID_HELPER` class, as it was made redundant by my changes.
Fixes https://gitlab.com/kicad/code/kicad/issues/7402
