The width between two width points was a straight line, so a variable-width
stroke turned a corner at every width point.
- Each side of a width profile now follows a monotone cubic (Fritsch-Carlson)
through its points: no kink at a point, flat at a point wider or narrower
than both neighbours, never past either point of a span. Points on one line
stay on it and two-point tapers are unchanged; stacked points still step.
- widest() counts each span's wider left and wider right, since the two sides
needn't peak together.
- The outliner samples straight runs between width points closely enough to
follow the curve to the drawing tolerance (at most 64 samples per span and
4,096 per piece); straight spans get none.
- Tests that expected straight-line widths now expect the curve. The stroke
gradient coverage test uses Teardrop instead of Wave until #5964 is fixed.
Add Anchor Points builds the new anchor list in one pass, Swatch Library add looks names up in sets, full_documents dedups placed keys with a set, width profile lookups and mark insertion use binary search, and the symbolism tools cap and thin the previews of a long drag as Liquify does.
The canvas keeps a hairline visible by raising a stroke's weight to half a device pixel. A width profile multiplies that weight, so a 1 pt stroke with a 6x width point swelled to twice its size at 25% zoom and shrank back on zooming in. The minimum now goes to the profile's widest point instead; plain strokes are unchanged.
Review follow-ups:
- items_per_target maps each requested row on its own. Rows deleted or
duplicated together, one shared and one not, fell back to the literal
indices in every object, so the other objects could lose the wrong
items. The first object takes its own rows; each other object takes
its copies of the shared ones only.
- effect.dialog takes `aligned` (the panel passes it on a mixed
selection's shared effect row), and its OK and preview run
effect.setParams with it, so the dialog edits each object's own copy
of the effect instead of the first object's index in every object.
Tests: removing a shared stroke with an unshared fill leaves the other
object's fills; an aligned dialog's command carries `aligned`.
With several objects selected whose appearances differ in anything (two
circles whose fills differ but whose stroke and effect are the same),
the Appearance panel showed only "Mixed Appearances": no stroke, effect
or opacity row, so attributes the objects share couldn't be edited
together. It now lists what they share, as the issue describes:
- `vectorcraft_doc::appearance::SharedStack` (with `align`, a stacking-
order longest-common-subsequence match) gives the fills, strokes and
object-level effects every object has an equal copy of, and where each
is in every object's own stack.
- The panel's object row names the objects' common kind ("Path",
"Ellipse"; "Mixed Objects" only when kinds differ, as the Control bar
does), with an italic "Mixed Appearances" row under it when they
differ, then only the shared rows with their usual controls. The
Opacity row reads "Mixed" when opacity or blend mode differ (an edit
sets them all). The object row shows no fill chip when the fills
differ. Rows aren't dragged in a mixed selection: where a row would go
in each of several different stacks isn't one place.
- The engine maps a shared row to each object's own item: the active
item (a row of the first selected object's stack) always does, so the
Color, Stroke and Transparency panels edit every object's matching
item, and the item and effect commands do with `aligned: true`
(appearance.setItem / removeItem / duplicateItem, effect.remove /
duplicate / setParams / lightingPreset, transparency.set), each as
one undo step. moveItem and effect.move refuse aligned rows of
differing stacks. Without `aligned`, explicit indices keep their
meaning for single objects and scripts.
- "Mixed" is added to every catalog.
Tests: the shared stack of the issue's case, of a stroke at another
index, of nothing alike and of equal stacks, and that matches never
cross; editing the shared stroke edits both strokes (at index 1 and 2)
in one undo step that restores both, also through stroke.set on the
active row; removing a shared effect and adding a fill reach both, and
reordering differing stacks is refused; the panel lists kind, note,
Stroke, Feather and Opacity, not Fill, the full stack for alike objects
and "Mixed Objects" for a path and type. The existing object-row test
now expects the kind for two rectangles and the shared rows when their
opacity differs.
Sven Lafebre