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M3.83: gradients within, along or across a stroke

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The Gradient panel's Stroke buttons now work: with the Stroke proxy on a
linear or radial gradient they lay it within the stroke (placed on the
page, as before), along the path (start to end of each subpath) or across
it (left edge to right edge; inside/outside strokes span their visible
side). `paint.editGradient {stroke: true, strokeMode}` sets it (new art
too with nothing selected); `document.inspect` reports
strokeOptions.gradientMode. Model: StrokeLayer.gradient_mode (default
Within, not written).

Shared geometry in effects::stroke::gradient: ribs on the bisectors of
the flattened path (fans round sharp corners, widened under arrowheads,
following width profiles) cut slices each painted with a linear piece of
the gradient (Gradient::span). The canvas and raster export clip them to
the stroke's outline and arrowheads, grown a pixel and composited with
copy so there are no seams and translucent stops paint once. SVG and PDF
write the same slices clipped to the outline, with a warning (new
vectorcraft_svg::export_with_report). Outline Stroke and Expand make
gradient meshes clipped to the outline. Mesh quads now grow along their
edges so thin quads show no seams. Dashes, profiles and arrowheads keep
working in both modes.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
This commit is contained in:
bflatasticandClaude Opus 5.5 committed 2026-10-05 05:47:54 +07:00
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commit 025d758abe
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+1317 -32
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ASSETS.md
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@@ -131,6 +131,9 @@ Generated-in-code art is original and has no file to list. This covers the defau
| `assets/icons/dc-grad-freeform.svg` | VectorCraft contributors | Original work, drawn for VectorCraft | MIT OR Apache-2.0 | |
| `assets/icons/dc-grad-linear.svg` | VectorCraft contributors | Original work, drawn for VectorCraft | MIT OR Apache-2.0 | |
| `assets/icons/dc-grad-radial.svg` | VectorCraft contributors | Original work, drawn for VectorCraft | MIT OR Apache-2.0 | |
| `assets/icons/dc-grad-stroke-across.svg` | VectorCraft contributors | Original work, drawn for VectorCraft | MIT OR Apache-2.0 | |
| `assets/icons/dc-grad-stroke-along.svg` | VectorCraft contributors | Original work, drawn for VectorCraft | MIT OR Apache-2.0 | |
| `assets/icons/dc-grad-stroke-within.svg` | VectorCraft contributors | Original work, drawn for VectorCraft | MIT OR Apache-2.0 | |
| `assets/icons/dc-gradient.svg` | VectorCraft contributors | Original work, drawn for VectorCraft | MIT OR Apache-2.0 | |
| `assets/icons/dc-graphic-styles.svg` | VectorCraft contributors | Original work, drawn for VectorCraft | MIT OR Apache-2.0 | |
| `assets/icons/dc-grid-view.svg` | VectorCraft contributors | Original work, drawn for VectorCraft | MIT OR Apache-2.0 | |