{
  "version": 3,
  "sources": ["../../../src/lib/overlays/ScribbleOverlayUtil.ts"],
  "sourcesContent": ["import {\n\tEASINGS,\n\tOverlayUtil,\n\tTLCanvasUiColor,\n\tTLOverlay,\n\tTLScribble,\n\tTLThemeColors,\n\tgetSvgPathFromPoints,\n} from '@tldraw/editor'\nimport { getStroke } from '../shapes/shared/freehand/getStroke'\n\n/** @public */\nexport interface TLScribbleOverlay extends TLOverlay {\n\tprops: {\n\t\tscribble: TLScribble\n\t}\n}\n\n// Cache Path2D results for scribbles when inputs have not changed.\n// Keyed by scribble id; invalidated when points length/last point/zoom/size/taper/state change.\ninterface ScribbleCacheEntry {\n\tlen: number\n\tlastX: number\n\tlastY: number\n\tzoom: number\n\tsize: number\n\ttaper: boolean\n\tstate: TLScribble['state']\n\tpath: Path2D\n}\n\n/**\n * Overlay util for scribble strokes (eraser, lasso selection, etc.).\n *\n * @public\n */\nexport class ScribbleOverlayUtil extends OverlayUtil<TLScribbleOverlay> {\n\tstatic override type = 'scribble'\n\toverride options = { zIndex: 600, streamline: 0.32, cacheSize: 500 }\n\n\t// Per-editor cache so multiple <Tldraw /> instances on one page don't\n\t// trample each other's entries. String-keyed (not a WeakMap) because the\n\t// cache key is a logical identity \u2014 `scribble.id` \u2014 not the scribble\n\t// object. Tldraw's store replaces record objects on every update, so a\n\t// WeakMap keyed on the `TLScribble` instance would cache-miss every frame.\n\t// Lifetime is bounded by the Util instance plus the `cacheSize` cap below.\n\tprivate _scribblePathCache = new Map<string, ScribbleCacheEntry>()\n\n\toverride isActive(): boolean {\n\t\treturn this.editor.getInstanceState().scribbles.length > 0\n\t}\n\n\toverride getOverlays(): TLScribbleOverlay[] {\n\t\treturn this.editor.getInstanceState().scribbles.map((scribble) => ({\n\t\t\tid: `scribble:${scribble.id}`,\n\t\t\ttype: 'scribble',\n\t\t\tprops: { scribble },\n\t\t}))\n\t}\n\n\toverride render(ctx: CanvasRenderingContext2D, overlays: TLScribbleOverlay[]): void {\n\t\tconst zoom = this.editor.getZoomLevel()\n\t\tconst colors = this.editor.getCurrentTheme().colors[this.editor.getColorMode()]\n\n\t\tfor (const overlay of overlays) {\n\t\t\tconst { scribble } = overlay.props\n\t\t\tconst ptsLen = scribble.points.length\n\t\t\tif (!ptsLen) continue\n\n\t\t\tconst last = scribble.points[ptsLen - 1]\n\t\t\tconst cached = this._scribblePathCache.get(scribble.id)\n\t\t\tlet path: Path2D\n\t\t\tif (\n\t\t\t\tcached &&\n\t\t\t\tcached.len === ptsLen &&\n\t\t\t\tcached.lastX === last.x &&\n\t\t\t\tcached.lastY === last.y &&\n\t\t\t\tcached.zoom === zoom &&\n\t\t\t\tcached.size === scribble.size &&\n\t\t\t\tcached.taper === scribble.taper &&\n\t\t\t\tcached.state === scribble.state\n\t\t\t) {\n\t\t\t\tpath = cached.path\n\t\t\t} else {\n\t\t\t\tconst stroke = getStroke(scribble.points, {\n\t\t\t\t\tsize: scribble.size / zoom,\n\t\t\t\t\tstart: { taper: scribble.taper, easing: EASINGS.linear },\n\t\t\t\t\tlast: scribble.state === 'complete' || scribble.state === 'stopping',\n\t\t\t\t\tsimulatePressure: false,\n\t\t\t\t\tstreamline: this.options.streamline,\n\t\t\t\t})\n\n\t\t\t\tlet d: string\n\t\t\t\tif (stroke.length < 4) {\n\t\t\t\t\tconst r = scribble.size / zoom / 2\n\t\t\t\t\tconst { x, y } = last\n\t\t\t\t\td = `M ${x - r},${y} a ${r},${r} 0 1,0 ${r * 2},0 a ${r},${r} 0 1,0 ${-r * 2},0`\n\t\t\t\t} else {\n\t\t\t\t\td = getSvgPathFromPoints(stroke)\n\t\t\t\t}\n\n\t\t\t\tpath = new Path2D(d)\n\t\t\t\tthis._scribblePathCache.set(scribble.id, {\n\t\t\t\t\tlen: ptsLen,\n\t\t\t\t\tlastX: last.x,\n\t\t\t\t\tlastY: last.y,\n\t\t\t\t\tzoom,\n\t\t\t\t\tsize: scribble.size,\n\t\t\t\t\ttaper: scribble.taper,\n\t\t\t\t\tstate: scribble.state,\n\t\t\t\t\tpath,\n\t\t\t\t})\n\t\t\t\tif (this._scribblePathCache.size > this.options.cacheSize) this._scribblePathCache.clear()\n\t\t\t}\n\n\t\t\tctx.fillStyle = resolveCanvasUiColor(colors, scribble.color)\n\t\t\tctx.globalAlpha = scribble.opacity\n\t\t\tctx.fill(path)\n\t\t\tctx.globalAlpha = 1\n\t\t}\n\t}\n}\n\n/** @internal */\nfunction resolveCanvasUiColor(colors: TLThemeColors, color: TLCanvasUiColor): string {\n\tswitch (color) {\n\t\tcase 'accent':\n\t\tcase 'selection-stroke':\n\t\t\treturn colors.selectionStroke\n\t\tcase 'selection-fill':\n\t\t\treturn colors.selectionFill\n\t\tcase 'white':\n\t\t\treturn colors.selectedContrast\n\t\tcase 'black':\n\t\t\treturn colors.text\n\t\tcase 'laser':\n\t\t\treturn colors.laser\n\t\tcase 'muted-1':\n\t\t\treturn colors.brushFill\n\t\tdefault:\n\t\t\treturn colors.text\n\t}\n}\n"],
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