feat: LaTeX labels, decimal coords, ruler angle, shortcut cheatsheet, arrow keys#35
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Text primitives can now contain "\n" to render stacked lines, editable via the in-place canvas editor or the properties panel (both now textareas). Internally the text stores real newlines; the FidoCad file format keeps one physical line per primitive by escaping/unescaping "\n" on save/load, preserving backward compat with existing files that already contain raw backslashes. Rendering, bounding-box/hit-testing, rectangle selection, and the SVG/ PDF/PGF/TikZ exporters all stack additional lines below the first. Math-mode (LaTeX) text is not yet multiline-aware.
Each "\n"-separated line is now laid out through MathLayout independently, so a text primitive can mix math and plain lines (or math on every line) while stacking correctly on canvas, in hit-testing/selection bounds, and in the SVG/PDF exporters (which already laid out per line). All lines share one line-pitch sized to the tallest line's ascent/descent so nothing clips or overlaps.
… arrow keys - Render LaTeX math in macro/primitive Name and value labels (drawText now routes $...$ through layoutMath/drawMathSegments when TeX rendering is on) - Coordinate indicator shows unsnapped X/Y with two decimals - Ruler measurement box reports the angle from horizontal, in logical space - Add a Keyboard Shortcuts cheatsheet to the Help menu (macOS shows Command/ Option); trimmed redundant entries and dropped the non-functional library macro section - New shortcuts: Shift+E / Shift+S toggle an end / start arrowhead on any selected arrow-capable primitive (line, Bezier, complex curve)
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Summary
Five editor improvements, each covered by tests (763 unit tests green, typecheck + lint clean, production build passes).
1. LaTeX in Name/value labels
GraphicPrimitive.drawTextnow routes$...$math throughlayoutMath/drawMathSegmentswhen TeX rendering is active, so macros and every arrow-capable/base primitive render typeset math in their Name and value fields (on-screen and in bitmap/PNG export, which force-enables TeX on the same canvas path). Falls back to plain text when TeX is off or there is no delimiter.2. Two-decimal coordinate indicator
The X:/Y: readout shows
toFixed(2)and is fed unsnapped cursor coordinates, so the decimals carry real sub-grid precision. Snapped placement logic downstream is unchanged.3. Ruler angle
The ruler measurement box gained a third line: the angle from horizontal (e.g.
-53.13°), computed in logical space so it reflects the true drawing geometry regardless of independent X/Y zoom.4. Keyboard Shortcut cheatsheet (Help menu)
A grouped, scrollable modal listing every shortcut, keys rendered as
<kbd>caps. On macOSCtrl/Altdisplay as⌘/⌥. Redundant entries were trimmed (Home, Backspace, duplicate Redo) and the non-functional library-macro section removed.5. Arrowhead shortcuts (new)
Shift+E/Shift+Stoggle an end / start arrowhead on any selected arrow-capable primitive (line, Bézier, complex curve). Handled before the single-key tool/transform bindings so they don't fall through to Ellipse/Mirror. Group-consistent toggle, undo-aware, round-trips through save/load for free.Tests
test/primitives/name-value-latex.test.ts,test/ui/shortcuts-dialog.test.tstest/circuit/keyboard-shortcuts.test.ts(arrow toggles),test/circuit/ruler.test.ts(angle),test/ui/toolbar-controller.test.ts(decimal format)