tldraw/dist-esm/lib/shapes/shared/freehand/svgInk.mjs.map

A tiny little drawing editor.

{
  "version": 3,
  "sources": ["../../../../../src/lib/shapes/shared/freehand/svgInk.ts"],
  "sourcesContent": ["import { Vec, VecLike, assert, average, precise, toDomPrecision } from '@tldraw/editor'\nimport { getStrokeOutlineTracks } from './getStrokeOutlinePoints'\nimport { getStrokePoints } from './getStrokePoints'\nimport { setStrokePointRadii } from './setStrokePointRadii'\nimport { StrokeOptions, StrokePoint } from './types'\n\nexport function svgInk(rawInputPoints: VecLike[], options: StrokeOptions = {}) {\n\tconst { start = {}, end = {} } = options\n\tconst { cap: capStart = true } = start\n\tconst { cap: capEnd = true } = end\n\tassert(!start.taper && !end.taper, 'cap taper not supported here')\n\tassert(!start.easing && !end.easing, 'cap easing not supported here')\n\tassert(capStart && capEnd, 'cap must be true')\n\n\tconst points = getStrokePoints(rawInputPoints, options)\n\tsetStrokePointRadii(points, options)\n\tconst partitions = partitionAtElbows(points)\n\tlet svg = ''\n\tfor (const partition of partitions) {\n\t\tsvg += renderPartition(partition, options)\n\t}\n\n\treturn svg\n}\n\nfunction partitionAtElbows(points: StrokePoint[]): StrokePoint[][] {\n\tif (points.length <= 2) return [points]\n\n\tconst result: StrokePoint[][] = []\n\tlet currentPartition: StrokePoint[] = [points[0]]\n\tlet prevV = Vec.Sub(points[1].point, points[0].point).uni()\n\tlet nextV: Vec\n\tlet dpr: number\n\tlet prevPoint: StrokePoint, thisPoint: StrokePoint, nextPoint: StrokePoint\n\tfor (let i = 1, n = points.length; i < n - 1; i++) {\n\t\tprevPoint = points[i - 1]\n\t\tthisPoint = points[i]\n\t\tnextPoint = points[i + 1]\n\n\t\tnextV = Vec.Sub(nextPoint.point, thisPoint.point).uni()\n\t\tdpr = Vec.Dpr(prevV, nextV)\n\t\tprevV = nextV\n\n\t\tif (dpr < -0.8) {\n\t\t\t// always treat such acute angles as elbows\n\t\t\t// and use the extended .input point as the elbow point for swooshiness in fast zaggy lines\n\t\t\tconst elbowPoint = {\n\t\t\t\t...thisPoint,\n\t\t\t\tpoint: thisPoint.input,\n\t\t\t}\n\t\t\tcurrentPartition.push(elbowPoint)\n\t\t\tresult.push(cleanUpPartition(currentPartition))\n\t\t\tcurrentPartition = [elbowPoint]\n\t\t\tcontinue\n\t\t}\n\t\tcurrentPartition.push(thisPoint)\n\n\t\tif (dpr > 0.7) {\n\t\t\t// Not an elbow\n\t\t\tcontinue\n\t\t}\n\n\t\t// so now we have a reasonably acute angle but it might not be an elbow if it's far\n\t\t// away from it's neighbors, angular dist is a normalized representation of how far away the point is from it's neighbors\n\t\t// (normalized by the radius)\n\t\tif (\n\t\t\t(Vec.Dist2(prevPoint.point, thisPoint.point) + Vec.Dist2(thisPoint.point, nextPoint.point)) /\n\t\t\t\t((prevPoint.radius + thisPoint.radius + nextPoint.radius) / 3) ** 2 <\n\t\t\t1.5\n\t\t) {\n\t\t\t// if this point is kinda close to its neighbors and it has a reasonably\n\t\t\t// acute angle, it's probably a hard elbow\n\t\t\tcurrentPartition.push(thisPoint)\n\t\t\tresult.push(cleanUpPartition(currentPartition))\n\t\t\tcurrentPartition = [thisPoint]\n\t\t\tcontinue\n\t\t}\n\t}\n\tcurrentPartition.push(points[points.length - 1])\n\tresult.push(cleanUpPartition(currentPartition))\n\n\treturn result\n}\n\nfunction cleanUpPartition(partition: StrokePoint[]) {\n\t// clean up start of partition (remove points that are too close to the start)\n\tconst startPoint = partition[0]\n\tlet nextPoint: StrokePoint\n\twhile (partition.length > 2) {\n\t\tnextPoint = partition[1]\n\t\tif (\n\t\t\tVec.Dist2(startPoint.point, nextPoint.point) <\n\t\t\t(((startPoint.radius + nextPoint.radius) / 2) * 0.5) ** 2\n\t\t) {\n\t\t\tpartition.splice(1, 1)\n\t\t} else {\n\t\t\tbreak\n\t\t}\n\t}\n\t// clean up end of partition in the same fashion\n\tconst endPoint = partition[partition.length - 1]\n\tlet prevPoint: StrokePoint\n\twhile (partition.length > 2) {\n\t\tprevPoint = partition[partition.length - 2]\n\t\tif (\n\t\t\tVec.Dist2(endPoint.point, prevPoint.point) <\n\t\t\t(((endPoint.radius + prevPoint.radius) / 2) * 0.5) ** 2\n\t\t) {\n\t\t\tpartition.splice(partition.length - 2, 1)\n\t\t} else {\n\t\t\tbreak\n\t\t}\n\t}\n\t// now readjust the cap point vectors to point to their nearest neighbors\n\tif (partition.length > 1) {\n\t\tpartition[0] = {\n\t\t\t...partition[0],\n\t\t\tvector: Vec.Sub(partition[0].point, partition[1].point).uni(),\n\t\t}\n\t\tpartition[partition.length - 1] = {\n\t\t\t...partition[partition.length - 1],\n\t\t\tvector: Vec.Sub(\n\t\t\t\tpartition[partition.length - 2].point,\n\t\t\t\tpartition[partition.length - 1].point\n\t\t\t).uni(),\n\t\t}\n\t}\n\treturn partition\n}\n\nfunction circlePath(cx: number, cy: number, r: number) {\n\treturn (\n\t\t'M ' +\n\t\tcx +\n\t\t' ' +\n\t\tcy +\n\t\t' m -' +\n\t\tr +\n\t\t', 0 a ' +\n\t\tr +\n\t\t',' +\n\t\tr +\n\t\t' 0 1,1 ' +\n\t\tr * 2 +\n\t\t',0 a ' +\n\t\tr +\n\t\t',' +\n\t\tr +\n\t\t' 0 1,1 -' +\n\t\tr * 2 +\n\t\t',0'\n\t)\n}\n\nfunction renderPartition(strokePoints: StrokePoint[], options: StrokeOptions = {}): string {\n\tif (strokePoints.length === 0) return ''\n\tif (strokePoints.length === 1) {\n\t\treturn circlePath(strokePoints[0].point.x, strokePoints[0].point.y, strokePoints[0].radius)\n\t}\n\n\tconst { left, right } = getStrokeOutlineTracks(strokePoints, options)\n\tright.reverse()\n\tlet svg = `M${precise(left[0])}T`\n\n\t// draw left track\n\tfor (let i = 1; i < left.length; i++) {\n\t\tsvg += average(left[i - 1], left[i])\n\t}\n\t// draw end cap arc\n\t{\n\t\tconst point = strokePoints[strokePoints.length - 1]\n\t\tconst radius = point.radius\n\t\tconst direction = point.vector.clone().per().neg()\n\t\tconst arcStart = Vec.Add(point.point, Vec.Mul(direction, radius))\n\t\tconst arcEnd = Vec.Add(point.point, Vec.Mul(direction, -radius))\n\t\tsvg += `${precise(arcStart)}A${toDomPrecision(radius)},${toDomPrecision(\n\t\t\tradius\n\t\t)} 0 0 1 ${precise(arcEnd)}T`\n\t}\n\t// draw right track\n\tfor (let i = 1; i < right.length; i++) {\n\t\tsvg += average(right[i - 1], right[i])\n\t}\n\t// draw start cap arc\n\t{\n\t\tconst point = strokePoints[0]\n\t\tconst radius = point.radius\n\t\tconst direction = point.vector.clone().per()\n\t\tconst arcStart = Vec.Add(point.point, Vec.Mul(direction, radius))\n\t\tconst arcEnd = Vec.Add(point.point, Vec.Mul(direction, -radius))\n\t\tsvg += `${precise(arcStart)}A${toDomPrecision(radius)},${toDomPrecision(\n\t\t\tradius\n\t\t)} 0 0 1 ${precise(arcEnd)}Z`\n\t}\n\treturn svg\n}\n"],
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