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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 <noreply@anthropic.com>
This commit is contained in:
bflatastic
2026-10-05 05:47:54 +07:00
co-authored by Claude Opus 5.5
parent ccdb1b30f6
commit 025d758abe
26 changed files with 1317 additions and 32 deletions
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docs/mcp.md
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@@ -729,3 +729,18 @@ resets it.
{"name":"run_command","arguments":{"command":"stroke.set","params":{"cap":"round","dash":[6,3]}}}
{"name":"run_command","arguments":{"command":"appearance.newArt","params":{}}}
```
## Gradients on strokes
A linear or radial gradient on a stroke lies within it (placed on the page like a fill's gradient: the default), along
it (from the start of each subpath to its end) or across it (from the stroke's left edge to its right edge, left of the
path's direction; an inside or outside stroke spans the side it shows on). `paint.editGradient {stroke: true,
strokeMode: "within"|"along"|"across"}` sets it (the Gradient panel's Stroke buttons), and `document.inspect` reports it
as `strokeOptions.gradientMode`. Width profiles, dashes and arrowheads keep working: the gradient runs on through gaps
and into the heads. Outline Stroke and Expand turn such a stroke into gradient meshes clipped to its outline; SVG and PDF
write it as slices of linear gradients clipped to the outline (`vectorcraft_svg::export_with_report` and the PDF
report warn about it).
```json
{"name":"run_command","arguments":{"command":"paint.editGradient","params":{"stroke":true,"strokeMode":"along"}}}
```