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Smooth tool: smoothing over a closed path's first anchor keeps its start - #7261
The Smooth tool smooths the stretch of a selected path that a drag passes over. The help page describes dragging over a path again to smooth it further (Smooth tool). When a drag reached the first anchor of a closed path, path.smoothRegion rotated the anchors so an untouched anchor came first, refitted them, and closed the result without rotating back. The smoothed path then started at the first anchor past the drag. A drag over the whole of a closed path could also start it at a corner the refit kept. Dashes and type on the path start from a closed path's first anchor, so they moved along the path.
smooth_subpath (crates/engine/src/cmd/draw2/smooth.rs) now starts a smoothed closed path at its point nearest where the first anchor was, in both closed cases (part of the path in reach, and all of it). When an anchor of the result lies within 0.001 pt of that point, the path starts at that anchor. Otherwise the new start_nearest splits the segment there into two that trace it (a straight segment gets a corner point with no handles), and the new anchor comes first. The outline does not change. Where two points are equally near (within 0.000001 pt), the one earliest along the path before smoothing, counted from its first anchor, is used, and then the first in the smoothed path's order, so a ring whose last anchor lies on its first keeps its first anchor and gets no third anchor there.
A drag that does not reach the first anchor leaves that anchor first, as before.
A path with no finite nearest point is left as the refit returned it.
docs/target-app-parity.md has one line for it next to the Smooth tool entry. No params text or user-visible string changed.
The help page does not say where a smoothed closed path starts; this is VectorCraft's own rule. It changes where a smoothed closed path starts, and so where its dashes and type on the path start.
How it was tested
New engine tests in crates/engine/src/tests/draw2.rs:
smoothing_over_a_closed_paths_first_anchor_keeps_its_start: a drag over anchors 11, 0 and 1 of a 12-anchor ring with a bump at anchor 0 smooths the bump. The path stays closed and starts at its point nearest the old first anchor, and its outline's first move-to is that point. Anchors 2 to 10 keep their places, and undo restores the path. Without the change the path starts 104.2 pt from the old start, and the test fails.
smoothing_a_whole_closed_path_with_a_spike_keeps_its_start: a drag over the whole of a 66-anchor ring with a spike that the refit keeps as a corner leaves the path starting at its point nearest the old first anchor. Without the change the path starts 201.5 pt away at the spike, and the test fails.
smoothing_a_closed_path_away_from_its_first_anchor_keeps_it_first: a drag over anchors 5, 6 and 7 leaves anchor 0 first and unchanged. It passes with and without the change and checks that this case stays as it was.
New unit tests in crates/engine/src/cmd/draw2/smooth.rs:
start_nearest_splits_a_curve_where_it_passes_the_start, start_nearest_starts_at_an_anchor_near_the_start and start_nearest_splits_a_line_with_a_corner_point fail when start_nearest returns the path unchanged.
start_nearest_keeps_the_first_of_two_anchors_on_one_place checks that a ring whose last anchor lies on its first is left as it is.
start_nearest_breaks_a_tie_by_the_order_before_smoothing: the center of a square is equally near the middle of each side, and the square's smoothed copy starts two corners later. The path starts at the middle of the square's first side. It fails when the tie goes to the first point in the smoothed path's order.
start_nearest_leaves_an_open_path_or_a_start_without_a_place checks that an open path and a start that is not a number leave the path unchanged.
Focused checks on the final tree, on Linux. The branch is one commit on main at 08b6cfd3e8 and merges cleanly with it.
It conflicts with open #7243 in crates/engine/src/cmd/draw2/smooth.rs, crates/engine/src/tests/draw2.rs and docs/target-app-parity.md. It also conflicts with open #7262 in docs/target-app-parity.md, and with open #7263 in crates/engine/src/cmd/draw2/smooth.rs, crates/engine/src/tests/draw2.rs and docs/target-app-parity.md.
No panics in shipped code: no unwrap(), expect(), panic!, unreachable!, todo! or unimplemented! outside tests, and no unchecked indexing on data from files, parameters or
messages. Errors are returned as Result and shown to the user
(why and how).
Clean-room: nothing copied from Adobe products or GPL/AGPL code (AGENTS.md).
Every new asset has a row in ASSETS.md.
Summary by CodeRabbit
New Features
Closed-path smoothing now starts at the point on the refitted path nearest the original first anchor when smoothing reaches it. If needed, an anchor is inserted without changing the path outline. Open paths remain unchanged.
Bug Fixes
Importing .ai and EPS files now keeps envelope text editable when pixel-based checks pass; otherwise, the drawn artwork is retained.
When a drag reached the first anchor of a closed path, the smoothed path
started at the first anchor past the drag, and a drag over the whole
path could start it at a corner the refit kept. Dashes and type on the
path then started somewhere else.
The smoothed path now starts at its point nearest where the first anchor
was: at an anchor there, or at a new anchor split into the segment
there, which leaves the outline as it is. Of points equally near, the
one earliest along the path before smoothing, from its first anchor,
is used. A drag that does not reach the first anchor leaves it first,
as before.
Part of storytold#2224.
Reviewing files that changed from the base of the PR and between 74f55b0 and e012d80.
Files selected for processing: 3
crates/engine/src/cmd/draw2/smooth.rs
crates/engine/src/tests/draw2.rs
docs/target-app-parity.md
No actionable comments were generated in the recent review.
Walkthrough
Closed-path smoothing now adjusts the path start to the refitted point nearest its original first anchor. It snaps to a nearby anchor or inserts an anchor by splitting a segment. Open paths and partially smoothed paths whose first untouched anchor is already first retain their existing start.
Changes: Closed-path smoothing start position
Layer / File(s)
Summary
Find and position the nearest point crates/engine/src/cmd/draw2/smooth.rs
The helper selects the nearest finite point, resolves ties by path order, snaps to a nearby anchor or splits a segment, and rotates the path. Tests cover curve and line splitting, snapping, tie-breaking, and unchanged inputs.
Apply start positioning during smoothing crates/engine/src/cmd/draw2/smooth.rs, crates/engine/src/tests/draw2.rs, docs/target-app-parity.md
Fully smoothed closed paths use the helper. Partially smoothed paths use it unless the first untouched anchor is already first. Tests cover nearest-start behavior, unchanged anchors, closure, and undo. The parity documentation describes the start rule.
This change moves a smoothed closed path's start point to the point nearest its original first anchor, without changing the outline. It affects only where dashes and text on a path begin, and drags that don't reach the first anchor behave as before. No actionable merge-blocking risks were found, and the change is covered by new tests.
Pre-merge checks: 4
Check name
Status
Explanation
Title check
The title names the main change: smoothing over a closed path's first anchor now keeps the path's start at that anchor. It matches the smooth_subpath change and the new tests. The wording is slightly …
Description check
The description follows the template sections: What and why, How it was tested, and Checklist. It explains the change, the rules for tie-breaking and snapping, the new tests, and the verification comm…
Linked Issues check
Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check
Check skipped because no linked issues were found for this pull request.
Full details: Title check
Explanation
The title names the main change: smoothing over a closed path's first anchor now keeps the path's start at that anchor. It matches the smooth_subpath change and the new tests. The wording is slightly awkward but the title is specific and accurate.
Full details: Description check
Explanation
The description follows the template sections: What and why, How it was tested, and Checklist. It explains the change, the rules for tie-breaking and snapping, the new tests, and the verification commands. Gaps: the 'cargo xtask ci' checkbox is unchecked and the CI run is only noted as pending, and the 'Every new asset' and 'Clean-room' items are checked without an asset change being described. These are minor and do not make the description largely incomplete.
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Reviewing files that changed from the base of the PR and between cccc17d and 74f55b0.
Files selected for processing: 3
crates/engine/src/cmd/draw2/smooth.rs
crates/engine/src/tests/draw2.rs
docs/target-app-parity.md
Files skipped from review as they are similar to previous changes: 1
docs/target-app-parity.md
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Actionable comments posted: 1
Fix comments: Fix CodeRabbit comments on this PR
Prompt to fix all issues
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only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at @docs/target-app-parity.md:
- Line 1121: Update the status line and feature revision history in the document
to reflect the Smooth tool behavior described in the new entry. Keep the
existing wording and organization of both sections, and include the behavior’s
closed-path start-point rule.
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Reviewing files that changed from the base of the PR and between 08b6cfd and fb476ca.
Files selected for processing: 3
crates/engine/src/cmd/draw2/smooth.rs
crates/engine/src/tests/draw2.rs
docs/target-app-parity.md
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Merged, thanks @dotCooCoo! It passed its CI checks.
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Part of #2224.
What and why
The Smooth tool smooths the stretch of a selected path that a drag passes over. The help page describes dragging over a path again to smooth it further (Smooth tool). When a drag reached the first anchor of a closed path,
path.smoothRegionrotated the anchors so an untouched anchor came first, refitted them, and closed the result without rotating back. The smoothed path then started at the first anchor past the drag. A drag over the whole of a closed path could also start it at a corner the refit kept. Dashes and type on the path start from a closed path's first anchor, so they moved along the path.smooth_subpath(crates/engine/src/cmd/draw2/smooth.rs) now starts a smoothed closed path at its point nearest where the first anchor was, in both closed cases (part of the path in reach, and all of it). When an anchor of the result lies within 0.001 pt of that point, the path starts at that anchor. Otherwise the newstart_nearestsplits the segment there into two that trace it (a straight segment gets a corner point with no handles), and the new anchor comes first. The outline does not change. Where two points are equally near (within 0.000001 pt), the one earliest along the path before smoothing, counted from its first anchor, is used, and then the first in the smoothed path's order, so a ring whose last anchor lies on its first keeps its first anchor and gets no third anchor there.docs/target-app-parity.mdhas one line for it next to the Smooth tool entry. No params text or user-visible string changed.The help page does not say where a smoothed closed path starts; this is VectorCraft's own rule. It changes where a smoothed closed path starts, and so where its dashes and type on the path start.
How it was tested
New engine tests in
crates/engine/src/tests/draw2.rs:smoothing_over_a_closed_paths_first_anchor_keeps_its_start: a drag over anchors 11, 0 and 1 of a 12-anchor ring with a bump at anchor 0 smooths the bump. The path stays closed and starts at its point nearest the old first anchor, and its outline's first move-to is that point. Anchors 2 to 10 keep their places, and undo restores the path. Without the change the path starts 104.2 pt from the old start, and the test fails.smoothing_a_whole_closed_path_with_a_spike_keeps_its_start: a drag over the whole of a 66-anchor ring with a spike that the refit keeps as a corner leaves the path starting at its point nearest the old first anchor. Without the change the path starts 201.5 pt away at the spike, and the test fails.smoothing_a_closed_path_away_from_its_first_anchor_keeps_it_first: a drag over anchors 5, 6 and 7 leaves anchor 0 first and unchanged. It passes with and without the change and checks that this case stays as it was.New unit tests in
crates/engine/src/cmd/draw2/smooth.rs:start_nearest_splits_a_curve_where_it_passes_the_start,start_nearest_starts_at_an_anchor_near_the_startandstart_nearest_splits_a_line_with_a_corner_pointfail whenstart_nearestreturns the path unchanged.start_nearest_keeps_the_first_of_two_anchors_on_one_placechecks that a ring whose last anchor lies on its first is left as it is.start_nearest_breaks_a_tie_by_the_order_before_smoothing: the center of a square is equally near the middle of each side, and the square's smoothed copy starts two corners later. The path starts at the middle of the square's first side. It fails when the tie goes to the first point in the smoothed path's order.start_nearest_leaves_an_open_path_or_a_start_without_a_placechecks that an open path and a start that is not a number leave the path unchanged.Focused checks on the final tree, on Linux. The branch is one commit on
mainat08b6cfd3e8and merges cleanly with it.cargo fmt --all -- --checkcargo clippy -p vectorcraft-engine --all-targets -- -D warningscargo check --workspace --testscargo test -p vectorcraft-engine --lib -- smooth draw2: 215 passed, 0 failed.cargo xtask brands,cargo xtask layers(30 crates) andcargo xtask assets(337 files).cargo xtask ciruns in this pull request's CI.It conflicts with open #7243 in
crates/engine/src/cmd/draw2/smooth.rs,crates/engine/src/tests/draw2.rsanddocs/target-app-parity.md. It also conflicts with open #7262 indocs/target-app-parity.md, and with open #7263 incrates/engine/src/cmd/draw2/smooth.rs,crates/engine/src/tests/draw2.rsanddocs/target-app-parity.md.Checklist
cargo xtask cipasses (fmt, clippy, tests, assets, brands, layers, wasm).unwrap(),expect(),panic!,unreachable!,todo!orunimplemented!outside tests, and no unchecked indexing on data from files, parameters ormessages. Errors are returned as
Resultand shown to the user(why and how).
ASSETS.md.Summary by CodeRabbit
.aiand EPS files now keeps envelope text editable when pixel-based checks pass; otherwise, the drawn artwork is retained.