feat: smart elbow arrows — perpendicular routing, rounded corners, style filters - #113
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feat: smart elbow arrows — perpendicular routing, rounded corners, style filters#113Amark19 wants to merge 4 commits into
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Two elbow-arrow gaps vs eraser.io/Excalidraw: - Style filters (width/style/colour) never applied to an elbow arrow. The panel's applyToActive only styled a `line` connector, skipping the elbow's `polyline` — so changing width/dash/colour did nothing. Now it styles both connector types. - The elbow connector had sharp corners. It now renders with rounded corners (a short quadratic fillet at each bend, capped to the leg length) plus round line joins/caps, matching the eraser/Excalidraw look. The route's first/last points stay exact, so endpoints/binding/hit-testing are unchanged. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Elbow arrows routed as a plain dominant-axis mid-bend that ignored which side of each shape the endpoint sat on, so they cut diagonally toward a midpoint instead of leaving the shape square-on. Now a bound elbow records each end's exit direction (the outward edge normal, via binding's rerouteArrow) and the router stubs out perpendicular to each edge, then connects the stubs with a clean right-angled path (facing/perpendicular/opposed cases handled, collinear points collapsed). Free-drawn elbows and live endpoint drags still use the plain mid-bend. Combined with the rounded corners this matches the eraser.io/Excalidraw elbow look. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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A bound elbow froze its exit side to wherever it was first dropped, so moving a shape to the opposite side forced an ugly wrap-around (the arrow looped out and the tip could land off-canvas). Elbow re-routing now chooses each end's exit side dynamically from the shapes' relative positions — attaching at the midpoint of the edge that FACES the other end and exiting perpendicular — like eraser.io/Excalidraw. Straight arrows still keep their dropped attach point. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
…jog) Elbow arrows now route with the shapes themselves as obstacles (grid + A*): - an arrow between distant nodes goes AROUND intervening boxes instead of cutting through them; - treating the arrow's own two endpoints as obstacles means it can no longer coil back inside them when shapes are dragged close/overlapping; - nearly-aligned facing ports snap to a straight run, killing the tiny jog. Pathfinding runs only over shapes near the arrow (kept cheap) and falls back to the built-in perpendicular mid-bend when it can't connect the ports. New utils/orthRoute.js owns the router; binding feeds it the obstacle set and a pre-computed scene route flows through setArrowEndpoints -> applyEndpointsLocal. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This was referenced Aug 24, 2026
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Brings elbow arrows up to eraser.io/Excalidraw quality.
What changed
lineconnector; it now styles the elbow'spolylinetoo (width/style/colour + head recolour).Verified in-browser
sw 3→6,dash null→[24,18],stroke→red, head recoloured.Follow-up (not in this PR)
Obstacle-aware routing (paths that go around intervening shapes) and a curved arrow type / midpoint bend handles remain as larger, separate work.
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