forked from 1b-agent/opencadstudio-upstream
Hakan SevenandClaude Opus 4.8
9b1a495549
Dashed/dash-dot lines could end in a gap ("empty space at the end"),
especially inside paperspace viewports. The dash pattern was only centred
on each wire, which makes the two ends symmetric but does not force them
onto a solid dash.
Implement AutoCAD "A" (aligned) linetypes: the line begins AND ends on a
solid dash, interior dashes stay nominal, and the two end dashes stretch
symmetrically to absorb the remainder (so parallel lines share an
identical interior). wire_distances computes the end-dash length D and
total length L for a dash-first pattern (D = (L - k*P + a) / 2); the GPU
in_dash walk force-lights the two end regions and phases the interior to
resume right after the start dash. Lines shorter than one pattern period
draw solid.
Only alternating dash-first patterns are aligned; gap/dot-first,
consecutive-dash, NaN-break (plinegen=false) and solid lines keep the
prior behaviour. Native and web (wasm) shaders kept in sync.
Refs #13.
Co-Authored-By: Claude Opus 4.8 <[email protected]>