[Legacy canvas] pcbnew: show center-point, start/end-points of arcs + nodes of lines

[madworm]

I find myself creating routing paths more often lately.

Taking the board outline (rounded edges) as a reference, it's getting tedious to determine the center-points for arcs, as well as their starting- and end-points. More or less the same issue with polygon lines.

A visual indicator of where these points are would help immensely. Indicators should show up for existing arc/lines as well as while creating new ones. Possibly have this configurable via display settings.

See the mockup image.

[madworm (madworm-de-inkscape)]

A few additions:

1) To avoid a cluttered-up look, it would be good to only show these handles when needed (i.e. by pressing a hotkey), or when the cursor is in their vicinity.

2) Unfortunately the grid is not always aligned to handles, so optional snapping (global config and / or hotkey) to them would be nice. Much like snapping to pads and tracks.

[Jeff Young (jeyjey)]

This has been implemented in the OpenGL canvas.

[Nick Østergaard (nickoe)]

I think it is better to consider this bug generally and say it is fixed in opengl. It is not going to be implemented in the legacy canvas unless someone unexpectedly proposes a patch. The legacy canvas are to be abandoned soon.