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Dimension tool: no construction guides through a first point off the anchors - #7477
#3973 by vecteza gave the Dimension tool's Linear picks Smart Guides, and with it the second point snapped onto the construction guides through the first point. This changes that behavior. By VectorCraft's own rule, the second point now has no construction guides through a first point that is not on an anchor. A click beside a segment straight below such a first point lands on the segment instead of staying on the vertical guide through the first point.
After a first point picked on an anchor, the construction guides through it still apply, as before. The second point still snaps to anchors, centers and alignment lines, and with Snap to Perpendicular or Snap to Tangent on, it lands where the line from the first point meets a segment square or grazes a curve.
DimensionTool::snap_linear (crates/tools/src/dimension.rs) passes Leave::contact for a first point without an anchor link and keeps Leave::segment for one on an anchor. docs/dimensions.md describes the rule. In docs/target-app-parity.md, the example of a point on the vertical construction guide is removed from the line #7092 added, since this change makes it untrue, and a new evidence line follows that line.
How it was tested
crates/tools/src/dimension.rs: a_point_on_a_guide_stays_on_the_guide now checks that beside the edge below a first point off the anchors the pick lands on the edge, and that away from the art it stays at the pointer. New the_second_point_after_an_anchor_lands_on_construction_guides checks that after a first point on an anchor the second point lands on the 45 degree guide, and that the same offset from a first point off the anchors stays at the pointer. New the_second_point_lands_square_to_a_segment_or_grazing_a_curve checks the perpendicular foot on a slanted line and a tangent point on a circle, each with its label and at a place no construction guide reaches, and that with both options off the foot is not taken.
crates/engine/tests/it/dimensions.rs: linear_picks_show_and_snap_to_smart_guides (from Dimension tool: Linear picks show and snap to Smart Guides #3973) now expects the second pick in line with the bottom edge instead of on the vertical through the first point.
a_point_on_a_guide_stays_on_the_guide and linear_picks_show_and_snap_to_smart_guides fail with the old Leave::segment for every first point, and the_second_point_after_an_anchor_lands_on_construction_guides fails with Leave::contact for every first point. The perpendicular and tangent test passes either way and guards the behavior that stays.
cargo test -p vectorcraft-tools -p vectorcraft-engine: 21 test binaries and 2 doc-test runs, 8,193 passed, 0 failed, 4 ignored.
cargo fmt --all -- --check: reports only crates/svg/src/lib.rs:491, which is already on main and which fmt: format crates/svg/src/lib.rs #7400 fixes; no file in this branch.
The full cargo xtask ci runs in this pull request's CI.
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
Bug Fixes
Linear dimensions now snap the second point more predictably: construction guides through the first point apply only when it was picked on an anchor. Perpendicular and tangent snapping remain available, and the pointer stays in place when no snap applies.
Points already on a guide can align with another object’s guide within the Smart Guides tolerance.
Documentation
Clarified Linear dimension snapping behavior and updated related guidance.
…anchors
With Smart Guides on, the Dimension tool's second point snapped onto the
construction guides through the first point (Smart Guides › Construction
Guides), so a click beside a segment straight below a first point that
was not on an anchor stayed on the vertical guide instead of landing on
the segment.
The second point now has no construction guides through a first point
that is not on an anchor. After a first point picked on an anchor, the
construction guides through it still apply. The second point still snaps
to anchors, centers and alignment lines, and with Snap to Perpendicular
or Snap to Tangent on it lands where the line from the first point meets
a segment square or grazes a curve.
Docs: docs/dimensions.md, docs/target-app-parity.md.
The Dimension tool now selects second-point guide-leave behavior based on whether the first point is linked to an anchor. Tests and documentation describe the resulting construction-guide, segment, and curve snapping behavior.
An unlinked first point no longer provides a construction guide that constrains the second point. Perpendicular and tangent snapping remain available. An anchor-linked first point retains construction-guide snapping. Tests and documentation cover these behaviors and guide-alignment cases.
The Dimension tool's second-point snapping change looks consistent with its tests and docs. Before merging, add the dated revision entry that the parity document requires. This is a documentation-only follow-up with no runtime risk.
Pre-merge checks: 4
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Title check
The title names the main behavior change: the Dimension tool no longer snaps the second point to construction guides through a first point that is not on an anchor. The raw summary and objectives conf…
Description check
The description follows the template's required sections: 'What and why' explains the behavior change and links the prior PR #3973, and 'How it was tested' lists the added and updated tests and the co…
Linked Issues check
Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check
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Full details: Title check
Explanation
The title names the main behavior change: the Dimension tool no longer snaps the second point to construction guides through a first point that is not on an anchor. The raw summary and objectives confirm this is the primary change, and the title is specific and concise.
Full details: Description check
Explanation
The description follows the template's required sections: 'What and why' explains the behavior change and links the prior PR #3973, and 'How it was tested' lists the added and updated tests and the commands run. The checklist is present, with the three items marked that the author could verify. The first checklist item (cargo xtask ci) is left unchecked, and the author explains CI will run it, so this is acceptable. The description is mostly complete.
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Actionable comments posted: 1
Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @docs/target-app-parity.md:
- Line 598: The Feature revisions table does not record the documented Dimension
tool behavior. Add a dated entry referencing the behavior and its regression
evidence, and state whether scores and estimates remain unchanged; leave the
existing status line unchanged.
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Reviewing files that changed from the base of the PR and between a47d7ee and b79ca7b.
Files selected for processing: 5
crates/engine/tests/it/dimensions.rs
crates/tools/src/dimension.rs
crates/tools/src/guides/snap.rs
docs/dimensions.md
docs/target-app-parity.md
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Merged, thanks @dotCooCoo! It passed its CI checks.
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What and why
#3973 by vecteza gave the Dimension tool's Linear picks Smart Guides, and with it the second point snapped onto the construction guides through the first point. This changes that behavior. By VectorCraft's own rule, the second point now has no construction guides through a first point that is not on an anchor. A click beside a segment straight below such a first point lands on the segment instead of staying on the vertical guide through the first point.
After a first point picked on an anchor, the construction guides through it still apply, as before. The second point still snaps to anchors, centers and alignment lines, and with Snap to Perpendicular or Snap to Tangent on, it lands where the line from the first point meets a segment square or grazes a curve.
DimensionTool::snap_linear(crates/tools/src/dimension.rs) passesLeave::contactfor a first point without an anchor link and keepsLeave::segmentfor one on an anchor.docs/dimensions.mddescribes the rule. Indocs/target-app-parity.md, the example of a point on the vertical construction guide is removed from the line #7092 added, since this change makes it untrue, and a new evidence line follows that line.How it was tested
crates/tools/src/dimension.rs:a_point_on_a_guide_stays_on_the_guidenow checks that beside the edge below a first point off the anchors the pick lands on the edge, and that away from the art it stays at the pointer. Newthe_second_point_after_an_anchor_lands_on_construction_guideschecks that after a first point on an anchor the second point lands on the 45 degree guide, and that the same offset from a first point off the anchors stays at the pointer. Newthe_second_point_lands_square_to_a_segment_or_grazing_a_curvechecks the perpendicular foot on a slanted line and a tangent point on a circle, each with its label and at a place no construction guide reaches, and that with both options off the foot is not taken.crates/engine/tests/it/dimensions.rs:linear_picks_show_and_snap_to_smart_guides(from Dimension tool: Linear picks show and snap to Smart Guides #3973) now expects the second pick in line with the bottom edge instead of on the vertical through the first point.a_point_on_a_guide_stays_on_the_guideandlinear_picks_show_and_snap_to_smart_guidesfail with the oldLeave::segmentfor every first point, andthe_second_point_after_an_anchor_lands_on_construction_guidesfails withLeave::contactfor every first point. The perpendicular and tangent test passes either way and guards the behavior that stays.Commands run on this branch:
cargo clippy -p vectorcraft-tools -p vectorcraft-engine --all-targets -- -D warnings: clean.cargo test -p vectorcraft-tools -p vectorcraft-engine: 21 test binaries and 2 doc-test runs, 8,193 passed, 0 failed, 4 ignored.cargo fmt --all -- --check: reports onlycrates/svg/src/lib.rs:491, which is already onmainand which fmt: format crates/svg/src/lib.rs #7400 fixes; no file in this branch.The full
cargo xtask ciruns in this pull request's CI.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