#1144: Live Corners round corners between curved segments too

A corner is now any anchor that isn't smooth where two sides meet at an
angle, straight or curved, as in Illustrator. The cut meets each side at
its setback measured along the curve, leaves both sides along their
tangents there, and each curved side is trimmed to what the cuts at its
ends leave of it. The largest radius is still the one taking the cut
halfway along the shorter side, measured along the curve. Corners
between straight sides draw exactly as before.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/mcp.md

@@ -1434,8 +1434,9 @@ size. The journal entry of a scaling command records the `strokes` and `corners`
 ## Live Corners
 
 `object.setLiveShape {id?, ids?, radius?, kind?, corners?, items?}` sets the corners of any path (one undo step): a live
-rectangle's or polygon's, a star's, a pen path's. A corner is an anchor without handles between two straight sides
-(not an open path's ends, not a smooth anchor, not one the sides run straight on through). `radius` (pt) and `kind`
+rectangle's or polygon's, a star's, a pen path's. A corner is an anchor where two sides, straight or curved, meet at an angle
+(not an open path's ends, not a smooth anchor, not one the sides run straight on through); a curved side is trimmed to
+what the cut leaves of it. `radius` (pt) and `kind`
 (`round`, `invertedRound` or `chamfer`) go to the `corners` given, else to the corners holding a Direct-Selected
 anchor (`select.anchors`), else to every corner. `corners` are anchor indices of the path with its corners uncut,
 counting every subpath's anchors in order: a rectangle's 0 top-left, 1 top-right, 2 bottom-right, 3 bottom-left; a

docs/target-app-parity.md

@@ -1,6 +1,6 @@
 # Parity with Adobe Illustrator
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-11 · **Change:** minor (Type advanced: proportional vertical metrics (`vpal`) done, #966; Shape Builder: #893 fixed, merged regions of crossing lines no longer keep seams; scores unchanged while #937 is open; #1034: document-point character controls after object/group scaling; full readiness recomputed as the standard's additive weighted sum, ~62%; per-audience hours; essentials-user score ~75% added; ready-for-real-work re-examined: 50% → 55%, mainstream 65% added; earlier the same day: full re-measure against Illustrator 2026 30.x; merged the ROADMAP's parity estimate, honest assessment and "Shipped so far" into this file) · **Target:** Adobe Illustrator 2026 (30.x; public release notes through 30.7, August 2026)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-11 · **Change:** minor (Drawing tools: Live Corners round corners between curved sides, #1144; Type advanced: proportional vertical metrics (`vpal`) done, #966; Shape Builder: #893 fixed, merged regions of crossing lines no longer keep seams; scores unchanged while #937 is open; #1034: document-point character controls after object/group scaling; full readiness recomputed as the standard's additive weighted sum, ~62%; per-audience hours; essentials-user score ~75% added; ready-for-real-work re-examined: 50% → 55%, mainstream 65% added; earlier the same day: full re-measure against Illustrator 2026 30.x; merged the ROADMAP's parity estimate, honest assessment and "Shipped so far" into this file) · **Target:** Adobe Illustrator 2026 (30.x; public release notes through 30.7, August 2026)
 
 The authoritative parity assessment. [`ROADMAP.md`](../ROADMAP.md) summarizes it; [`gaps.md`](gaps.md) is
 the work list made from it. Deep areas have their own checklists: [UI and interaction](ui-parity.md),
@@ -68,7 +68,7 @@ dominate; 3D, graphs and automation are specialist). They sum to 105. Feature de
 | Area | Weight | Done | Main gaps | One agent (h) | Kind |
 |---|---:|---:|---|---:|---|
 | Selection, transform & align tools | 6 | 85% | Free Transform/Scale/Reflect along a rotated box, Start Global Edit, transform nuances | 4–6 | estimated |
-| Drawing tools (Pen, Curvature, Pencil, shapes, Shaper) | 7 | 85% | Shaper construction widget, Pencil/Pen nuances, Blob Brush options, Touch Type, Dimension tool, Live Corners on curved corners; see [ui-parity.md](ui-parity.md) | 8–13 | estimated |
+| Drawing tools (Pen, Curvature, Pencil, shapes, Shaper) | 7 | 85% | Shaper construction widget, Pencil/Pen nuances, Blob Brush options, Touch Type, Dimension tool, Live Corners' Relative rounding; see [ui-parity.md](ui-parity.md) | 8–13 | estimated |
 | Path operations, Pathfinder, Shape Builder, Live Paint | 5 | 80% | Shape Builder misses planar regions in real files (#937), its gap detection and options; Live Paint Gap Options | 4–8 | estimated (lowered from 86%: open issues) |
 | Colour, swatches, gradients, patterns, mesh, recolor | 7 | 92% | 30.0's gradient dither, perceptual blending and gradient presets; freeform and mixed spot/process gradients in SVG/PDF | 4–7 | estimated (lowered from 96%: target moved) |
 | Strokes, brushes, width profiles | 5 | 88% | Art brush Overlap, Pattern brush auto corners, brush libraries, pen pressure on macOS, tilt/bearing/rotation | 8–15 | estimated |
@@ -297,7 +297,7 @@ about 1–1.5 agent-hours each, so the other rows (estimated on the older scale)
 | Area | Weight | Done | Missing (main items) | One agent (h) |
 |---|---:|---:|---|---:|
 | Selection, transform & align tools | 6 | 85% | Free Transform/Scale/Reflect along a rotated box, Start Global Edit, transform nuances (the rotated persistent bounding box is done) | 4–6 |
-| Drawing tools | 7 | 85% | rough-square Shaper recognition and orientation steps corrected; editable Shaper Groups landed; remaining: Shaper construction widget/gesture refinements, pencil and the remaining pen modifier nuances, the freehand Tool Options' Keep selected, Alt to the Smooth tool, Blob Brush Merge Only with Selection and brush angle/roundness, Touch Type, Live Corners on corners between curved sides (and Relative rounding) | 8–13 |
+| Drawing tools | 7 | 85% | rough-square Shaper recognition and orientation steps corrected; editable Shaper Groups landed; remaining: Shaper construction widget/gesture refinements, pencil and the remaining pen modifier nuances, the freehand Tool Options' Keep selected, Alt to the Smooth tool, Blob Brush Merge Only with Selection and brush angle/roundness, Touch Type, Live Corners' Relative rounding | 8–13 |
 | Path operations, Pathfinder, Shape Builder, Live Paint | 5 | 86% | Live Paint gap options, Shape Builder gap detection, options (Tool Options dialog, clicking a stroke in merge mode) and Shift-drag marquee | 3–6 |
 | Colour, swatches, gradients, patterns, mesh, recolor | 7 | 96% | freeform and mixed spot/process gradients in SVG/PDF (exported as stops or process colours), pattern fills in Expand | 2–4 |
 | Strokes, brushes, width profiles | 5 | 90% | the Art brush's Overlap, auto-generated Pattern brush corners and new tile art in Pattern Brush Options (Brush Options for every brush type done), brush libraries (generated in code), pen pressure on macOS (the windowing layer reports none there), brushes driven by pen tilt, bearing and barrel rotation (6D art pens) | 8–15 |
@@ -406,7 +406,7 @@ Moved from the ROADMAP's "Shipped so far" on 2026-10-10. Update it when a featur
   - **Cutting:** Eraser, Scissors, Knife, Mirror & Cut, Line Cut and Rectangle Cut (real geometry, compound paths keep their holes).
   - **Transform:** Rotate, Reflect, Scale, Shear (click or Alt-click snaps the reference point to anchors and centres; Alt-click opens the tool's dialog, and a drag with Alt down at the release, from the press or pressed mid-drag, transforms a copy), Reshape, Free Transform (free and perspective distort and shear, switched by the keys held during a handle drag).
     Align, Distribute, Distribute Spacing, Reflect and Shear return an error for any `horizontal`, `vertical`, `to`, `axis`, `bounds` or `spacing` value they don't take, listing the choices, and Align returns one when a call gives neither `horizontal` nor `vertical`; nothing moves and no undo step is recorded.
-  - **Live Corners:** drag a live rectangle's corner widgets (Selection or Direct Selection) to round all corners, with a radius readout; with Direct Selection, select corner anchors to show and round just those corners (#381). Each corner keeps its own radius and kind (Round, Inverted Round, Chamfer): Alt-click a widget to cycle the kind, double-click it for the Corners dialog, and the Properties and Transform radius fields set the selected corners (`object.setLiveShape {corners, radius, kind}`). Corners stay circular when the rectangle is scaled unevenly or along its own sides when rotated (the radius keeps its size, or scales by the mean scale with Scale Corners on); only a shear distorts them. On a rectangle that isn't square every corner is the same circle: a radius past half the shorter side stops there for all of them, the widgets sit on the corners as drawn and turn the edited corners red at that limit, CSS export writes the drawn radii, and rectangles saved stretched by older versions get circular corners when their corners are next set (#442). Live Corners work on any path's corners too, as on a rectangle's (#511): a star's, a live polygon's (which also shows them to the Selection tool, has a Corner Radius field in the Properties and Transform panels and keeps its radius as its sides change) and a pen path's, wherever two straight sides meet at an anchor. Direct Selection shows the widgets of every corner, or of the corners holding selected anchors; each corner is a circle tangent to both sides, drawn no larger than takes its cut halfway along its shorter side; a path keeps its uncut outline so its corners stay editable, and the same command, dialog, angle preference and View › Hide Corner Widget apply.
+  - **Live Corners:** drag a live rectangle's corner widgets (Selection or Direct Selection) to round all corners, with a radius readout; with Direct Selection, select corner anchors to show and round just those corners (#381). Each corner keeps its own radius and kind (Round, Inverted Round, Chamfer): Alt-click a widget to cycle the kind, double-click it for the Corners dialog, and the Properties and Transform radius fields set the selected corners (`object.setLiveShape {corners, radius, kind}`). Corners stay circular when the rectangle is scaled unevenly or along its own sides when rotated (the radius keeps its size, or scales by the mean scale with Scale Corners on); only a shear distorts them. On a rectangle that isn't square every corner is the same circle: a radius past half the shorter side stops there for all of them, the widgets sit on the corners as drawn and turn the edited corners red at that limit, CSS export writes the drawn radii, and rectangles saved stretched by older versions get circular corners when their corners are next set (#442). Live Corners work on any path's corners too, as on a rectangle's (#511): a star's, a live polygon's (which also shows them to the Selection tool, has a Corner Radius field in the Properties and Transform panels and keeps its radius as its sides change) and a pen path's, wherever two sides meet at an angle at an anchor that isn't smooth: curved sides too, trimmed to what the cut leaves of them (#1144). Direct Selection shows the widgets of every corner, or of the corners holding selected anchors; each corner is a circle tangent to both sides, drawn no larger than takes its cut halfway along its shorter side; a path keeps its uncut outline so its corners stay editable, and the same command, dialog, angle preference and View › Hide Corner Widget apply.
   - **Pen:** Alt pressed in the middle of dragging out an anchor splits its handles and keeps the curve already shaped into it (only the outgoing handle follows the pointer); Space held while dragging out an anchor moves it, handles and all. A press on the first anchor of the path being drawn closes it whatever the drag then does: the drag shapes the closing curve (symmetric handles, Alt breaks them) and the release closes the path wherever it ends (#501). Clicking the last anchor of the path being drawn retracts its outgoing handle (convert cursor), and dragging from it pulls out a new one on its own. Auto Add/Delete: over a selected path, a click on a segment adds an anchor and a click on an anchor deletes it (add and delete cursors); Shift held, or Preferences › General › Disable Auto Add/Delete, starts a new path instead. Alt held over a handle end or an anchor of a selected path (the one being drawn too) works as the Anchor Point tool, with its convert cursor: dragging a handle moves it alone, clicking a smooth anchor makes it a corner, dragging an anchor pulls out new symmetric handles, dragging a segment reshapes it; drawing then goes on. Cmd (Ctrl) held drags with the selection tool chosen last, Direct Selection until one is (handles, anchors and segments of the path being drawn or another), and the Pen then goes on drawing its path while that stays selected; the pointer shows that tool's while Cmd is held. The same holds for agents (`pointer_gesture` with `mods.cmd`), as the borrowing now lives in the engine (#494).
   - **Path editing (#494):** the handles shown are the handles that drag: Direct Selection drags those of a path selected as a whole (as the Pen leaves it), the Anchor Point tool and Pen+Alt no longer grab handles that Show handles when multiple anchors are selected hides, a handle shorter than the tolerance leaves its anchor to be picked, and the anchor tools pick within Selection & Anchor Display › Tolerance. A dragged segment keeps a smooth anchor at either end smooth. With Direct Selection, the Pen, the Curvature and the anchor tools, a path selected as a whole shows all its anchors selected, and the Control bar and the Properties panel offer Convert (corner, smooth) for them too; Remove and Cut wait for anchors direct-selected (#504). A handle drag gathers its snap targets once per drag (it took 21 ms per pointer move on a 20,000-path document, now 1 ms; `vectorcraft-cli perf` measures handle and segment drags on a 5,000-anchor path).
   - **Graphs:** Column, Stacked Column, Bar, Stacked Bar, Line, Area, Scatter, Pie and Radar graph tools with Graph Data and Graph Type. A series starts in greyscale; Group Selection's fill and stroke are kept separately on the graph and reapplied when its data, type or size changes, and through save, open and undo. Graph Type's Override Calculated Values (both `axisMin` and `axisMax`) uses exactly that value-axis range, split into the tick count (5 when automatic). Line graphs take Edge-to-Edge Lines (off by default: the points sit at the centres of their categories; graphs saved before the option keep their edge-to-edge lines), and radar graphs follow Mark Data Points and Connect Data Points. Blank cells (an empty CSV cell or `null`) are values left out, not zeros: columns, bars and stacked segments skip them, lines and scatter lines break around them and the value axis ignores them, while area, pie and radar draw them as 0; a number in straight quotes is a label, and the data window writes it back quoted. Graph types combine: Graph Type on series picked with Group Selection (or `series` indexes) draws them as their own type, with column, stacked column, line and area mixing on the vertical value axis and bar and stacked bar on the horizontal one; stacked columns take one slot of the cluster, lines draw in front of columns and areas behind. The value axis goes on the left, the right or both sides (column, stacked column, line, area and scatter graphs; bar graphs keep theirs along the bottom), and Separate Scales gives the series assigned to the right axis a scale of their own with its own tick values. Each value axis takes tick marks of no, short or full (across the plot) length and a count per division, and a prefix and suffix for its numbers; the category axis takes tick marks too (none by default), at or between its labels. Graph Design, Column and Marker artwork remain open.
@@ -460,6 +460,7 @@ Moved from the ROADMAP's "Shipped so far" on 2026-10-10. Update it when a featur
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-11 | minor | Drawing tools: Live Corners on corners between curved sides (#1144) leaves the missing list; score and hours unchanged at this rounding (estimated) |
 | 2026-10-11 | minor | Type advanced: Proportional Metrics in vertical type (`vpal`, #966) leaves the missing list; score and hours unchanged at this rounding (estimated) |
 | 2026-10-11 | minor | Shape Builder #893 fixed (planar-map faces share their corners exactly, so merges leave no seams); Path operations stays 80% and Shape Builder 70% while #937 is open (estimated) |
 | 2026-10-10 | minor | Merged main: initial live Revolve landed (#846). 3D 0% → ~8% (50–85 h), menu stubs 28 → 27; depth, readiness and totals unchanged within rounding |

docs/ui-parity.md

@@ -1,6 +1,6 @@
 # UI and interaction parity
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-11 · **Change:** minor (several artboards selected at once, #1139; earlier: the Edit Toolbar drawer, #1018) · **Target:** Adobe Illustrator 2026 (30.x)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-11 · **Change:** minor (Live Corners round corners between curved sides, #1144; earlier: several artboards selected at once, #1139) · **Target:** Adobe Illustrator 2026 (30.x)
 
 How VectorCraft's tools, handles, snapping and panels behave next to Illustrator's. A vector illustrator's
 trust is in the details: where a handle lands, what Shift and Alt do mid-drag, what a smart guide snaps to,
@@ -70,7 +70,7 @@ tools, never checked side by side) isn't captured row by row.
 | Convert selected anchors to corner/smooth from the Control bar and Properties | done | |
 | Cut path at selected anchors, Remove Anchor Points, Delete removes segments | done | |
 | Live Corners widgets (radius readout, Alt-click cycles kind, double-click the Corners dialog) | done | clicking a widget without pre-selecting the anchor (#908) missing |
-| Corners between curved sides, Relative rounding | missing | |
+| Corners between curved sides (#1144), Relative rounding | partial | Relative rounding missing |
 | Isolation mode by double-click, breadcrumbs, Esc to exit | done | |
 | "Magnetic" moves of selected anchors with a modifier (#955 request) | missing | not an Illustrator feature as documented; under discussion |
 
@@ -169,6 +169,7 @@ re-measure of the panels added since.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-11 | minor | Live Corners: corners between curved sides round too, the curve trimmed to what the cut leaves (#1144); score unchanged (estimated) |
 | 2026-10-11 | minor | Artboards: Shift-click selects several, which move, copy and delete together (#1139); score unchanged (estimated) |
 | 2026-10-11 | minor | Edit Toolbar opens the All Tools drawer beside the toolbar instead of a centred dialog, dims the tools the toolbar holds, and edits the toolbar by drag and drop while it is open (#1018); score unchanged (estimated) |
 | 2026-10-11 | minor | Direct Selection: dragging a path selected whole by an anchor moves it whole; Alt-drag copies by an anchor too, toggles during the drag and snaps onto the original (#1104); score unchanged (estimated) |