{
  "version": 3,
  "sources": ["../src/entityToPolyline.ts"],
  "sourcesContent": ["import bSpline from './util/bSpline'\nimport createArcForLWPolyine from './util/createArcForLWPolyline'\nimport logger from './util/logger'\n\nimport type {\n  ArcEntity,\n  CircleEntity,\n  ControlPoint,\n  EllipseEntity,\n  EntityToPolylineOptions,\n  HandlerVertex,\n  LeaderEntity,\n  LineEntity,\n  RayEntity,\n  ShapeEntity,\n  SplineEntity,\n  WipeoutEntity,\n  XLineEntity,\n} from './types'\nimport type { PointTuple } from './types/common'\n\n// Re-export types for backward compatibility\nexport type { ControlPoint, EntityToPolylineOptions } from './types'\n\ntype Point = PointTuple\n\n// Local vertex type with required coordinates for runtime processing\ninterface LocalVertex extends HandlerVertex {\n  faces?: number[]\n}\n\n// Local polyline type that uses our vertex with required coordinates\ninterface LocalPolylineEntity {\n  type: string\n  vertices: LocalVertex[]\n  closed?: boolean\n  polyfaceMesh?: boolean\n  polygonMesh?: boolean\n}\n\ntype Entity =\n  | LineEntity\n  | LeaderEntity\n  | RayEntity\n  | XLineEntity\n  | ShapeEntity\n  | WipeoutEntity\n  | (LocalPolylineEntity & { type: 'LWPOLYLINE' | 'POLYLINE' })\n  | {\n      type: 'SOLID' | 'TRACE'\n      corners?: Array<{ x: number; y: number }>\n      points?: Array<{ x: number; y: number }>\n    }\n  | CircleEntity\n  | EllipseEntity\n  | ArcEntity\n  | SplineEntity\n\n/**\n * Rotate a set of points.\n *\n * @param points the points\n * @param angle the rotation angle\n */\nconst rotate = (points: Point[], angle: number): Point[] => {\n  return points.map(function (p) {\n    return [\n      p[0] * Math.cos(angle) - p[1] * Math.sin(angle),\n      p[1] * Math.cos(angle) + p[0] * Math.sin(angle),\n    ]\n  })\n}\n\n/**\n * Interpolate an ellipse\n * @param cx center X\n * @param cy center Y\n * @param rx radius X\n * @param ry radius Y\n * @param start start angle in radians\n * @param start end angle in radians\n */\nconst interpolateEllipse = (\n  cx: number,\n  cy: number,\n  rx: number,\n  ry: number,\n  start: number,\n  end: number,\n  rotationAngle?: number\n): Point[] => {\n  if (end < start) {\n    end += Math.PI * 2\n  }\n\n  // ----- Relative points -----\n\n  // Start point\n  let points: Point[] = []\n  const dTheta = (Math.PI * 2) / 72\n  const EPS = 1e-6\n  for (let theta = start; theta < end - EPS; theta += dTheta) {\n    points.push([Math.cos(theta) * rx, Math.sin(theta) * ry])\n  }\n  points.push([Math.cos(end) * rx, Math.sin(end) * ry])\n\n  // ----- Rotate -----\n  if (rotationAngle) {\n    points = rotate(points, rotationAngle)\n  }\n\n  // ----- Offset center -----\n  points = points.map(function (p): Point {\n    return [cx + p[0], cy + p[1]]\n  })\n\n  return points\n}\n\n/**\n * Interpolate a b-spline. The algorithm examins the knot vector\n * to create segments for interpolation. The parameterisation value\n * is re-normalised back to [0,1] as that is what the lib expects (\n * and t i de-normalised in the b-spline library)\n *\n * @param controlPoints the control points\n * @param degree the b-spline degree\n * @param knots the knot vector\n * @returns the polyline\n */\nexport const interpolateBSpline = (\n  controlPoints: ControlPoint[],\n  degree: number,\n  knots: number[],\n  interpolationsPerSplineSegment?: number,\n  weights?: number[]\n): Point[] => {\n  const polyline: Point[] = []\n  const controlPointsForLib = controlPoints.map(function (p): Point {\n    return [p.x, p.y]\n  })\n\n  const segmentTs = [knots[degree]]\n  const domain: Point = [knots[degree], knots[knots.length - 1 - degree]]\n\n  for (let k = degree + 1; k < knots.length - degree; ++k) {\n    if (segmentTs[segmentTs.length - 1] !== knots[k]) {\n      segmentTs.push(knots[k])\n    }\n  }\n\n  interpolationsPerSplineSegment = interpolationsPerSplineSegment || 25\n  for (let i = 1; i < segmentTs.length; ++i) {\n    const uMin = segmentTs[i - 1]\n    const uMax = segmentTs[i]\n    for (let k = 0; k <= interpolationsPerSplineSegment; ++k) {\n      const u = (k / interpolationsPerSplineSegment) * (uMax - uMin) + uMin\n      // Clamp t to 0, 1 to handle numerical precision issues\n      let t = (u - domain[0]) / (domain[1] - domain[0])\n      t = Math.max(t, 0)\n      t = Math.min(t, 1)\n      const p = bSpline(t, degree, controlPointsForLib, knots, weights)\n      polyline.push([p[0], p[1]])\n    }\n  }\n  return polyline\n}\n\nexport const polyfaceOutline = (entity: LocalPolylineEntity): Point[][] => { // NOSONAR\n  const vertices: Array<{ x: number; y: number }> = []\n  const faces: Array<{ indices: number[]; hiddens: boolean[] }> = []\n\n  for (const v of entity.vertices) {\n    if (v.faces) {\n      const face: { indices: number[]; hiddens: boolean[] } = {\n        indices: [],\n        hiddens: [],\n      }\n      for (const i of v.faces) {\n        if (i === 0) {\n          break\n        }\n        // Negative indices signify hidden edges\n        face.indices.push(i < 0 ? -i - 1 : i - 1)\n        face.hiddens.push(i < 0)\n      }\n      if ([3, 4].includes(face.indices.length)) faces.push(face)\n    } else {\n      vertices.push({ x: v.x, y: v.y })\n    }\n  }\n\n  // If a segment starts at the end of a previous line, continue it\n  const polylines: number[][] = []\n  const segment = (a: number, b: number): void => {\n    for (const prev of polylines) {\n      if (prev.slice(-1)[0] === a) {\n        prev.push(b)\n        return\n      }\n    }\n    polylines.push([a, b])\n  }\n\n  for (const face of faces) {\n    for (let beg = 0; beg < face.indices.length; beg++) {\n      if (face.hiddens[beg]) {\n        continue\n      }\n      const end = (beg + 1) % face.indices.length\n      segment(face.indices[beg], face.indices[end])\n    }\n  }\n\n  // Sometimes segments are not sequential, in that case\n  // we need to find if they can mend gaps between others\n  for (const a of polylines) {\n    for (const b of polylines) {\n      if (a !== b && a[0] === b.slice(-1)[0]) {\n        b.push(...a.slice(1))\n        a.splice(0, a.length)\n        break\n      }\n    }\n  }\n\n  return polylines\n    .filter((l) => l.length)\n    .map((l) => l.map((i) => vertices[i]).map((v) => [v.x, v.y]))\n}\n\n/**\n * Convert a parsed DXF entity to a polyline. These can be used to render the\n * the DXF in SVG, Canvas, WebGL etc., without depending on native support\n * of primitive objects (ellispe, spline etc.)\n */\nexport default function entityToPolyline( // NOSONAR\n  entity: Entity,\n  options?: EntityToPolylineOptions,\n): Point[] {\n  options = options || {}\n  let polyline: Point[] | undefined\n\n  const INFINITE_LINE_LENGTH = 1000\n\n  const normalize2 = (x: number, y: number): { x: number; y: number } | null => {\n    const len = Math.hypot(x, y)\n    if (len === 0) return null\n    return { x: x / len, y: y / len }\n  }\n\n  if (entity.type === 'LINE') {\n    polyline = [\n      [entity.start.x, entity.start.y],\n      [entity.end.x, entity.end.y],\n    ]\n  }\n\n  if (entity.type === 'LEADER') {\n    if (entity.vertices.length >= 2) {\n      polyline = entity.vertices.map((v) => [v.x, v.y])\n    } else {\n      logger.warn('LEADER entity with insufficient vertices')\n      polyline = []\n    }\n  }\n\n  if (entity.type === 'RAY') {\n    const dir = normalize2(entity.direction.x, entity.direction.y)\n    if (dir === null) {\n      logger.warn('RAY entity with zero direction vector')\n      polyline = []\n    } else {\n      polyline = [\n        [entity.start.x, entity.start.y],\n        [\n          entity.start.x + dir.x * INFINITE_LINE_LENGTH,\n          entity.start.y + dir.y * INFINITE_LINE_LENGTH,\n        ],\n      ]\n    }\n  }\n\n  if (entity.type === 'XLINE') {\n    const dir = normalize2(entity.direction.x, entity.direction.y)\n    if (dir === null) {\n      logger.warn('XLINE entity with zero direction vector')\n      polyline = []\n    } else {\n      polyline = [\n        [\n          entity.basePoint.x - dir.x * INFINITE_LINE_LENGTH,\n          entity.basePoint.y - dir.y * INFINITE_LINE_LENGTH,\n        ],\n        [\n          entity.basePoint.x + dir.x * INFINITE_LINE_LENGTH,\n          entity.basePoint.y + dir.y * INFINITE_LINE_LENGTH,\n        ],\n      ]\n    }\n  }\n\n  if (entity.type === 'SHAPE') {\n    const x = entity.insertionPoint?.x ?? 0\n    const y = entity.insertionPoint?.y ?? 0\n    const size = entity.size ?? 0\n    const scaleX = entity.relativeXScale ?? 1\n    const length = size * scaleX\n    polyline = [\n      [x, y],\n      [x + length, y],\n    ]\n  }\n\n  if (entity.type === 'WIPEOUT') {\n    const verts = entity.clipBoundaryVertices\n    if (!verts || verts.length < 2) {\n      logger.warn('WIPEOUT entity with missing clip boundary vertices')\n      polyline = []\n    } else {\n      const insX = entity.insertionPoint?.x ?? 0\n      const insY = entity.insertionPoint?.y ?? 0\n\n      const ux = entity.uVector?.x ?? 1\n      const uy = entity.uVector?.y ?? 0\n\n      const vx = entity.vVector?.x ?? 0\n      const vy = entity.vVector?.y ?? 1\n\n      polyline = verts.map((p) => [\n        insX + ux * p.x + vx * p.y,\n        insY + uy * p.x + vy * p.y,\n      ])\n\n      if (polyline.length > 0) {\n        const first = polyline[0]\n        const last = polyline[polyline.length - 1]\n        if (first[0] !== last[0] || first[1] !== last[1]) {\n          polyline.push(first)\n        }\n      }\n    }\n  }\n\n  if (entity.type === 'LWPOLYLINE' || entity.type === 'POLYLINE') {\n    polyline = []\n    if (entity.polyfaceMesh) {\n      // Only return the first polyline because we can't return many\n      polyline.push(...polyfaceOutline(entity)[0])\n    } else if (entity.polygonMesh) {\n      // Do not attempt to render polygon meshes\n    } else if (entity.vertices.length) {\n      if (entity.closed) {\n        entity.vertices = entity.vertices.concat(entity.vertices[0])\n      }\n      for (let i = 0, il = entity.vertices.length; i < il - 1; ++i) {\n        const from: Point = [entity.vertices[i].x, entity.vertices[i].y]\n        const to: Point = [entity.vertices[i + 1].x, entity.vertices[i + 1].y]\n        polyline.push(from)\n        if (entity.vertices[i].bulge) {\n          polyline = polyline.concat(\n            createArcForLWPolyine(from, to, entity.vertices[i].bulge!),\n          )\n        }\n        // The last iteration of the for loop\n        if (i === il - 2) {\n          polyline.push(to)\n        }\n      }\n    } else {\n      logger.warn('Polyline entity with no vertices')\n    }\n  }\n\n  if (entity.type === 'CIRCLE') {\n    polyline = interpolateEllipse(\n      entity.x,\n      entity.y,\n      entity.r,\n      entity.r,\n      0,\n      Math.PI * 2,\n    )\n    if (entity.extrusionZ === -1) {\n      polyline = polyline.map(function (p): Point {\n        return [-p[0], p[1]]\n      })\n    }\n  }\n\n  if (entity.type === 'ELLIPSE') {\n    const rx = Math.hypot(entity.majorX, entity.majorY)\n    const ry = entity.axisRatio * rx\n    const majorAxisRotation = -Math.atan2(-entity.majorY, entity.majorX)\n    polyline = interpolateEllipse(\n      entity.x,\n      entity.y,\n      rx,\n      ry,\n      entity.startAngle,\n      entity.endAngle,\n      majorAxisRotation,\n    )\n    if (entity.extrusionZ === -1) {\n      polyline = polyline.map(function (p): Point {\n        return [-p[0], p[1]]\n      })\n    }\n  }\n\n  if (entity.type === 'ARC') {\n    // Why on earth DXF has degree start & end angles for arc,\n    // and radian start & end angles for ellipses is a mystery\n    polyline = interpolateEllipse(\n      entity.x,\n      entity.y,\n      entity.r,\n      entity.r,\n      entity.startAngle,\n      entity.endAngle,\n    )\n\n    // I kid you not, ARCs and ELLIPSEs handle this differently,\n    // as evidenced by how AutoCAD actually renders these entities\n    if (entity.extrusionZ === -1) {\n      polyline = polyline.map(function (p): Point {\n        return [-p[0], p[1]]\n      })\n    }\n  }\n\n  if (entity.type === 'SPLINE') {\n    polyline = interpolateBSpline(\n      entity.controlPoints,\n      entity.degree,\n      entity.knots,\n      options.interpolationsPerSplineSegment,\n      entity.weights,\n    )\n  }\n\n  if (entity.type === 'SOLID' || entity.type === 'TRACE') {\n    const corners = entity.corners ?? entity.points\n    if (corners && corners.length >= 4) {\n      polyline = [\n        [corners[0].x, corners[0].y],\n        [corners[1].x, corners[1].y],\n        [corners[2].x, corners[2].y],\n        [corners[3].x, corners[3].y],\n        [corners[0].x, corners[0].y],\n      ]\n    }\n  }\n\n  if (!polyline) {\n    logger.warn('unsupported entity for converting to polyline:', entity.type)\n    return []\n  }\n  return polyline\n}\n"],
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}