{
  "version": 3,
  "sources": ["../../../../../src/lib/shapes/shared/freehand/getStrokePoints.ts"],
  "sourcesContent": ["import { Vec2d, VecLike } from '@tldraw/editor'\nimport type { StrokeOptions, StrokePoint } from './types'\n\nconst MIN_START_PRESSURE = 0.025\nconst MIN_END_PRESSURE = 0.01\n\n/**\n * ## getStrokePoints\n *\n * Get an array of points as objects with an adjusted point, pressure, vector, distance, and\n * runningLength.\n *\n * @param points - An array of points (as `[x, y, pressure]` or `{x, y, pressure}`). Pressure is\n *   optional in both cases.\n * @param options - An object with options.\n * @public\n */\nexport function getStrokePoints(\n\trawInputPoints: VecLike[],\n\toptions: StrokeOptions = {}\n): StrokePoint[] {\n\tconst { streamline = 0.5, size = 16, simulatePressure = false } = options\n\n\t// If we don't have any points, return an empty array.\n\tif (rawInputPoints.length === 0) return []\n\n\t// Find the interpolation level between points.\n\tconst t = 0.15 + (1 - streamline) * 0.85\n\n\t// Whatever the input is, make sure that the points are in number[][].\n\tlet pts = rawInputPoints.map(Vec2d.From)\n\n\tlet pointsRemovedFromNearEnd = 0\n\n\tif (!simulatePressure) {\n\t\t// Strip low pressure points from the start of the array.\n\t\tlet pt = pts[0]\n\t\twhile (pt) {\n\t\t\tif (pt.z >= MIN_START_PRESSURE) break\n\t\t\tpts.shift()\n\t\t\tpt = pts[0]\n\t\t}\n\t}\n\n\tif (!simulatePressure) {\n\t\t// Strip low pressure points from the end of the array.\n\t\tlet pt = pts[pts.length - 1]\n\t\twhile (pt) {\n\t\t\tif (pt.z >= MIN_END_PRESSURE) break\n\t\t\tpts.pop()\n\t\t\tpt = pts[pts.length - 1]\n\t\t}\n\t}\n\n\tif (pts.length === 0)\n\t\treturn [\n\t\t\t{\n\t\t\t\tpoint: Vec2d.From(rawInputPoints[0]),\n\t\t\t\tinput: Vec2d.From(rawInputPoints[0]),\n\t\t\t\tpressure: simulatePressure ? 0.5 : 0.15,\n\t\t\t\tvector: new Vec2d(1, 1),\n\t\t\t\tdistance: 0,\n\t\t\t\trunningLength: 0,\n\t\t\t\tradius: 1,\n\t\t\t},\n\t\t]\n\n\t// Strip points that are too close to the first point.\n\tlet pt = pts[1]\n\twhile (pt) {\n\t\tif (Vec2d.Dist(pt, pts[0]) > size / 3) break\n\t\tpts[0].z = Math.max(pts[0].z, pt.z) // Use maximum pressure\n\t\tpts.splice(1, 1)\n\t\tpt = pts[1]\n\t}\n\n\t// Strip points that are too close to the last point.\n\tconst last = pts.pop()!\n\tpt = pts[pts.length - 1]\n\twhile (pt) {\n\t\tif (Vec2d.Dist(pt, last) > size / 3) break\n\t\tpts.pop()\n\t\tpt = pts[pts.length - 1]\n\t\tpointsRemovedFromNearEnd++\n\t}\n\tpts.push(last)\n\n\tconst isComplete =\n\t\toptions.last ||\n\t\t!options.simulatePressure ||\n\t\t(pts.length > 1 && Vec2d.Dist(pts[pts.length - 1], pts[pts.length - 2]) < size) ||\n\t\tpointsRemovedFromNearEnd > 0\n\n\t// Add extra points between the two, to help avoid \"dash\" lines\n\t// for strokes with tapered start and ends. Don't mutate the\n\t// input array!\n\tif (pts.length === 2 && options.simulatePressure) {\n\t\tconst last = pts[1]\n\t\tpts = pts.slice(0, -1)\n\t\tfor (let i = 1; i < 5; i++) {\n\t\t\tconst next = Vec2d.Lrp(pts[0], last, i / 4)\n\t\t\tnext.z = ((pts[0].z + (last.z - pts[0].z)) * i) / 4\n\t\t\tpts.push(next)\n\t\t}\n\t}\n\n\t// The strokePoints array will hold the points for the stroke.\n\t// Start it out with the first point, which needs no adjustment.\n\tconst strokePoints: StrokePoint[] = [\n\t\t{\n\t\t\tpoint: pts[0],\n\t\t\tinput: pts[0],\n\t\t\tpressure: simulatePressure ? 0.5 : pts[0].z,\n\t\t\tvector: new Vec2d(1, 1),\n\t\t\tdistance: 0,\n\t\t\trunningLength: 0,\n\t\t\tradius: 1,\n\t\t},\n\t]\n\n\t// We use the totalLength to keep track of the total distance\n\tlet totalLength = 0\n\n\t// We're set this to the latest point, so we can use it to calculate\n\t// the distance and vector of the next point.\n\tlet prev = strokePoints[0]\n\n\t// Iterate through all of the points, creating StrokePoints.\n\tlet point: Vec2d, distance: number\n\n\tif (isComplete && streamline > 0) {\n\t\tpts.push(pts[pts.length - 1].clone())\n\t}\n\n\tfor (let i = 1, n = pts.length; i < n; i++) {\n\t\tpoint =\n\t\t\t!t || (options.last && i === n - 1) ? pts[i].clone() : pts[i].clone().lrp(prev.point, 1 - t)\n\n\t\t// If the new point is the same as the previous point, skip ahead.\n\t\tif (prev.point.equals(point)) continue\n\n\t\t// How far is the new point from the previous point?\n\t\tdistance = Vec2d.Dist(point, prev.point)\n\n\t\t// Add this distance to the total \"running length\" of the line.\n\t\ttotalLength += distance\n\n\t\t// At the start of the line, we wait until the new point is a\n\t\t// certain distance away from the original point, to avoid noise\n\n\t\tif (i < 4 && totalLength < size) {\n\t\t\tcontinue\n\t\t}\n\n\t\t// Create a new strokepoint (it will be the new \"previous\" one).\n\t\tprev = {\n\t\t\tinput: pts[i],\n\t\t\t// The adjusted point\n\t\t\tpoint,\n\t\t\t// The input pressure (or .5 if not specified)\n\t\t\tpressure: simulatePressure ? 0.5 : pts[i].z,\n\t\t\t// The vector from the current point to the previous point\n\t\t\tvector: Vec2d.Sub(prev.point, point).uni(),\n\t\t\t// The distance between the current point and the previous point\n\t\t\tdistance,\n\t\t\t// The total distance so far\n\t\t\trunningLength: totalLength,\n\t\t\t// The stroke point's radius\n\t\t\tradius: 1,\n\t\t}\n\n\t\t// Push it to the strokePoints array.\n\t\tstrokePoints.push(prev)\n\t}\n\n\t// Set the vector of the first point to be the same as the second point.\n\tif (strokePoints[1]?.vector) {\n\t\tstrokePoints[0].vector = strokePoints[1].vector.clone()\n\t}\n\n\tif (totalLength < 1) {\n\t\tconst maxPressureAmongPoints = Math.max(0.5, ...strokePoints.map((s) => s.pressure))\n\t\tstrokePoints.forEach((s) => (s.pressure = maxPressureAmongPoints))\n\t}\n\n\treturn strokePoints\n}\n"],
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  "names": ["pt", "last"]
}