feat: measurement tools (distance, perimeter, area)#654
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Add calibrated measurement tools (distance, perimeter, polygon/rectangle/ ellipse area) with live, zoom-stable labels, scale calibration (incl. draw-to-calibrate), units (mm/cm/m/in/ft/yd/pt), decimal/fractional precision, and an optional secondary unit. Implementation: measurements are ordinary Line/Polyline/Polygon/Square/Circle annotations carrying typed `measurement` metadata; pure math lives in @embedpdf/models; persisted via the /EPDFCustom channel + spec /IT intent (native /Measure dictionary deferred — needs a pdfium WASM rebuild). Rendered across React/Preact/Vue/Svelte, with snippet-viewer UI (Measure mode, toolbar, calibrate dialog, property panel) and hold-Shift angle constraint.
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@MathiasWP is attempting to deploy a commit to the OpenBook Team on Vercel. A member of the Team first needs to authorize it. |
Fill rectangle/ellipse/polygon area measurements with a subtle 45° diagonal hatch (mode === 'area' only) so the enclosed region reads as the measured area. Sized in px/scale so density stays constant across zoom; shared AreaHatch helper with Vue/Svelte mirrors.
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@bobsingor thoughts on adding this? This is the missing piece for us to start using EmbedPDF |
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Adds calibrated measurement tools — distance (line), perimeter (polyline), and area (polygon / rectangle / ellipse) — with live, zoom-stable labels, scale calibration (including draw-to-calibrate), units (mm/cm/m/in/ft/yd/pt), decimal/fractional precision, and an optional secondary unit.
Implementation: measurements are ordinary Line/Polyline/Polygon/Square/Circle annotations carrying typed
measurementmetadata; the unit/geometry math is a pure module in@embedpdf/models. Calibration is persisted via the/EPDFCustomdata channel plus the spec/ITintent (a fully spec-compliant native/Measuredictionary for cross-viewer interop is deferred — it needs a pdfium WASM rebuild). Labels render across React/Preact/Vue/Svelte, and the snippet viewer gets a Measure mode (toolbar, draw-to-calibrate dialog, property panel) plus hold-Shift angle constraint.Resolves #223