Independent drawing functions (that don't expect any particular state to
be set up fo them) on the GAL need to reset the GAL properties they
use. This adds GAL::ResetTextAttributes() to make this easier.
This is important, as failing to reset mirroring can cause asserts in
OpenGL.
This is used in the Ruler tool (which previously did it one attribute at
a time) and also the Arc layout assistant, which previously failed to
reset mirroring.
Also reset on GAL construction, as these members appear to be
uninitialised.
This is required as the OpenGL GAL doesn't support mirrored
text, and if the state is not cleared after painting other mirrored
text, this is what is attempted.
Fixes: lp:1677210
* https://bugs.launchpad.net/kicad/+bug/1677210
This uses the two-point geometry manager to split the logic of the ruler
geometry and the preview item display. This allows the ruler to use that
manager's angle snap feature.
This allows to measure between features on a PCB. It uses a preview
EDA_ITEM in common, but due to the use of the IDs, it's currently
Pcbnew/Modedit only.
This also adds several "utils" for graphical functons useful when
drawing preview items on GAL canvases.
Fixes: lp:1467313
* https://bugs.launchpad.net/kicad/+bug/1467313
John Beard
Jon Evans