forked from 1b-agent/opencadstudio-upstream
Hakan Seven
0ec6d77cb1
Two bugs from #34: 1. Hovering a circle showed the Center snap as a diamond instead of the conventional circle outline. 2. Hovering a circle also showed Midpoint hits (triangle marker) even though a closed curve has no midpoint. (2) came from a "tessellated curve" fallback in the Midpoint snap path that produced a midpoint for every chord of the polyline approximation. Drop that fallback — only entities with explicit `key_vertices` (Line, LwPolyline) contribute per-segment midpoints now. Curves that DO have a single well-defined midpoint (arcs, and later splines) declare it explicitly via a new `SnapHint::Midpoint`; `arc.rs` emits one at the arc-length centre. (1) — and the broader "everything past Endpoint / Midpoint / Grid was a diamond" inconsistency — fixed by giving every `SnapType` a distinct marker in `SelectionCanvas::draw`: - Center: hollow circle - Node: circle with inscribed X - Quadrant: diamond (unchanged) - Intersection: X - Apparent Intersection: X inside a square - Insertion: two overlapping rectangles (tag glyph) - Perpendicular: right-angle hook - Tangent: circle with a bar across the top - Nearest: hourglass / bowtie - Extension: three dots - Parallel: two parallel diagonal bars - Endpoint / Midpoint / Grid: unchanged Closes #34