Update ruler drawing for zero corners

[pascalpp]

Summary

• Draw horizontal and vertical ruler ticks from the selected zero corner instead of assuming top-left geometry.
• Mirror tick labels, unit labels, and mouse-number values for right/bottom zero corners.
• Keep mouse number labels clear of resize handles on either horizontal edge.

Validation

• xcodebuild -project "Free Ruler.xcodeproj" -scheme "Free Ruler" test -only-testing:FreeRulerTests

Part of #192. Addresses #196.

[Copilot]

Pull request overview

Updates ruler layout/drawing to support all four “zero corner” configurations (top-left/top-right/bottom-left/bottom-right) by centralizing orientation-dependent geometry and mirroring tick/label/mouse-readout math accordingly. This aligns with the broader work in #192 and directly addresses the drawing requirements in #196.

Changes:

• Introduces ZeroCornerGeometry plus RulerGrowthDirection/RulerSide to derive growth direction, tick/label sides, resize sides, and frame math from the selected zero corner.
• Refactors horizontal/vertical tick rendering and mouse/unit label placement to use the new geometry (including mirrored readout values for flipped corners).
• Updates resize-handle placement and resize-frame math to support resizing from either end depending on the active zero corner, with expanded unit test coverage for geometry and drawing helpers.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
Free Ruler/Ruler.swift	Adds ZeroCornerGeometry and updates default-frame calculations to be zero-corner aware.
Free Ruler/RulerController.swift	Align/reset positioning now uses zero-corner geometry for consistent placement.
Free Ruler/HorizontalRule.swift	Draws ticks/labels from the active zero edge and mirrors mouse/unit label logic for flipped corners.
Free Ruler/VerticalRule.swift	Draws ticks/labels from the active zero edge and mirrors mouse/unit label logic for flipped corners.
Free Ruler/ResizeHandleView.swift	Moves resize handle to the correct far edge and updates resizing math to work from either end.
FreeRulerTests/RulerCoreTests.swift	Adds tests for zero-corner geometry, draw helper math, mirrored readouts, and resize behavior.
Free Ruler/de.lproj/MainMenu.strings	Adds localization entries for the “Flip” menu/menu-item.
Free Ruler/es.lproj/MainMenu.strings	Adds localization entries for the “Flip” menu/menu-item.
Free Ruler/fi.lproj/MainMenu.strings	Adds localization entries for the “Flip” menu/menu-item.
Free Ruler/ja.lproj/MainMenu.strings	Adds localization entries for the “Flip” menu/menu-item.
Free Ruler/zh-hans.lproj/MainMenu.strings	Adds localization entries for the “Flip” menu/menu-item.

Comments suppressed due to low confidence (1)

Free Ruler/VerticalRule.swift:170

• mouseNumberLabelRect always resolves collisions with the resize handle by pushing the mouse label upward (increasing origin.y). When the vertical resize handle is on the top edge (e.g. bottom zero-corners), this can push the label into/above the handle or even off the visible bounds. Adjust the collision logic to account for whether the handle is on the top or bottom half of the ruler and clamp the label rect accordingly.

        if let resizeHandleExclusionFrame = resizeHandleExclusionFrame {
            let minLabelBottom = resizeHandleExclusionFrame.maxY + mouseTickLabelResizeHandleSpacing
            labelRect.origin.y = max(labelRect.origin.y, minLabelBottom)
        }

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[pascalpp]

• Handle grouped zero-corner flips #204 : 2 dependent PRs (#205 , #216 )
• Cover direction-aware resizing #203
• Update ruler drawing for zero corners #202 👈 (View in Graphite)
• Introduce zero corner geometry helpers #207
• Make rulers flippable #199 : 1 other dependent PR (#201 )
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

Comments suppressed due to low confidence (1)

Free Ruler/VerticalRule.swift:170

• mouseNumberLabelRect only avoids the resize handle when it’s on the bottom edge (it always pushes the label upward). With non-default zero corners, the vertical resize handle can be on the top edge (see ZeroCornerGeometry.resizeSide(for: .vertical)), which can cause the mouse number label to overlap the handle. Update the exclusion logic to handle both top and bottom handles (similar to the horizontal ruler’s midX check).

        if let resizeHandleExclusionFrame = resizeHandleExclusionFrame {
            let minLabelBottom = resizeHandleExclusionFrame.maxY + mouseTickLabelResizeHandleSpacing
            labelRect.origin.y = max(labelRect.origin.y, minLabelBottom)
        }

[pascalpp]

[codex reviewer] Findings:

[P1] The vertical mouse-number exclusion still assumes the resize handle is at the bottom. For .bottomLeft / .bottomRight, the vertical handle moves to the top, but mouseNumberLabelRect always raises labelRect.origin.y to at least resizeHandleFrame.maxY + spacing. Near a top-side handle that can put the label above the ruler bounds, so the mouse number disappears instead of moving below the handle. Please branch on the handle side, or clamp with a top-side constraint, when the vertical resize handle is above the tick label.