Alt already deleted regions and pieces of open lines, but erase mode had
no edges of closed shapes, no distinct pointer, highlighted regions in the
merge-mode grey, only noticed Alt on a mouse move, and an erase drag could
flip mode at release. Like the reference app's erase mode:
- pathops::shape_builder(shapes, edges) returns a BuilderArrangement; with
`edges` it also cuts the outlines of closed (and filled open) paths
wherever other paths meet them. pathops::cut_out removes such a piece
from a path: a closed subpath opens there, an open one splits or
shortens, a piece all the way round takes its subpath, and a filled open
path's invisible closing edge never comes back as a visible segment.
Specks where paths only touch cut nothing; a zero-length input is no
longer the source of edges running through it. encloses_area is shared
with the tool's closing of filled open paths.
- BuilderMap (with_edges) hit-tests edges like line pieces (nearest wins);
an erase gesture that crosses an edge into a region deletes the region,
not the edge (erased_edges).
- shapeBuilder.merge {erase}: deletes the edges touched within tolerance
(from every shape along them), after the regions; returns `edges`.
shapeBuilder.regions lists `edges` (bounds, source). One undo step.
- Shape Builder tool: Alt held switches to erase mode and back on release:
red mesh/edge highlights of what will be deleted, a minus pointer
(Cursor::ShapeBuilder / ShapeBuilderErase, a plus in merge mode); a drag
keeps the mode it started in. The canvas re-hovers the tool when a
modifier changes, so the highlight follows Alt without a mouse move.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The Shape Builder only used the filled areas of the selected paths, so a
stroke-only line or open path across a shape did nothing. Like the
reference app's Shape Builder, open paths now act as cutting edges:
- pathops::shape_builder: with an open path in the selection, the
regions are the Live Paint planar map's faces (every path an edge), so a
line across a shape splits it and lines can enclose a region of their
own; it also returns each open path cut where other paths meet it. Closed
shapes alone, more than SHAPE_BUILDER_MAX_SEGMENTS segments, or a map
that can't be built fall back to the filled-area arrangement.
- Filled open paths count as closed (an invisible closing edge) where that
encloses an area; unfilled open paths and straight lines stay edges.
- shapeBuilder.merge: merging or deleting regions on both sides of a line
piece removes that piece (the line is split, its other pieces kept); an
area only lines enclose takes the current fill and the front-most
object's look. Alt (erase) within `tolerance` of a line piece deletes it.
Returns `lines` (pieces deleted).
- shapeBuilder.regions also lists the line pieces.
- The tool shares BuilderMap/Touched with the command, highlights the line
piece under the pointer while Alt is held and passes its tolerance.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The Live Paint Bucket now fills areas enclosed by any paths. Crossing
lines enclose faces it can fill, a line across a shape splits that shape's
face in two, and an area enclosed by paths becomes a face even when nothing
fills it (it starts unfilled). Edges are the paths cut wherever another path
meets them, keeping their stroke, so Shift-click paints each piece. Closed
shapes give the same faces as before.
Root cause: Live Paint built its faces from the Pathfinder regions, which
divide the filled areas of closed shapes. An open path counted only as the
area it would fill if closed, which for a straight line is nothing, so lines
divided nothing and the bucket found no face to fill. A new planar map in
vectorcraft-pathops (live_paint) sweeps every path as an edge: an open path
goes in traced there and back, with crossing counts that never cancel; faces
are walked on the resulting graph (holes included), and their fills and the
edges' sources are found geometrically. The sweep runs in an exactly sheared
frame, because it mishandles a horizontal line traced there and back.
Make, Merge, the bucket and Live Paint Selection all use it;
interior_point moves to vectorcraft-pathops with it.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
David Whiting