@tldraw/editor
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tldraw infinite canvas SDK (editor).
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{
"version": 3,
"sources": ["../../../src/lib/primitives/intersect.ts"],
"sourcesContent": ["import { Box } from './Box'\nimport { approximately, approximatelyLte, pointInPolygon } from './utils'\nimport { Vec, VecLike } from './Vec'\n\n// need even more intersections? See https://gist.github.com/steveruizok/35c02d526c707003a5c79761bfb89a52\n\n/**\n * Find the intersection between a line segment and a line segment.\n *\n * @param a1 - The first segment's first point.\n * @param a2 - The first segment's second point.\n * @param b1 - The second segment's first point.\n * @param b2 - The second segment's second point.\n * @public\n */\nexport function intersectLineSegmentLineSegment(\n\ta1: VecLike,\n\ta2: VecLike,\n\tb1: VecLike,\n\tb2: VecLike,\n\tprecision = 1e-10\n) {\n\tconst ABx = a1.x - b1.x\n\tconst ABy = a1.y - b1.y\n\tconst BVx = b2.x - b1.x\n\tconst BVy = b2.y - b1.y\n\tconst AVx = a2.x - a1.x\n\tconst AVy = a2.y - a1.y\n\tconst ua_t = BVx * ABy - BVy * ABx\n\tconst ub_t = AVx * ABy - AVy * ABx\n\tconst u_b = BVy * AVx - BVx * AVy\n\n\tif (approximately(ua_t, 0, precision) || approximately(ub_t, 0, precision)) return null // coincident\n\n\tif (approximately(u_b, 0, precision)) return null // parallel\n\n\tif (u_b !== 0) {\n\t\tconst ua = ua_t / u_b\n\t\tconst ub = ub_t / u_b\n\t\tif (\n\t\t\tapproximatelyLte(0, ua, precision) &&\n\t\t\tapproximatelyLte(ua, 1, precision) &&\n\t\t\tapproximatelyLte(0, ub, precision) &&\n\t\t\tapproximatelyLte(ub, 1, precision)\n\t\t) {\n\t\t\treturn Vec.AddXY(a1, ua * AVx, ua * AVy)\n\t\t}\n\t}\n\n\treturn null // no intersection\n}\n\n/**\n * Find the intersections between a line segment and a circle.\n *\n * @param a1 - The segment's first point.\n * @param a2 - The segment's second point.\n * @param c - The circle's center.\n * @param r - The circle's radius.\n * @public\n */\nexport function intersectLineSegmentCircle(a1: VecLike, a2: VecLike, c: VecLike, r: number) {\n\tconst a = (a2.x - a1.x) * (a2.x - a1.x) + (a2.y - a1.y) * (a2.y - a1.y)\n\tconst b = 2 * ((a2.x - a1.x) * (a1.x - c.x) + (a2.y - a1.y) * (a1.y - c.y))\n\tconst cc =\n\t\tc.x * c.x + c.y * c.y + a1.x * a1.x + a1.y * a1.y - 2 * (c.x * a1.x + c.y * a1.y) - r * r\n\tconst deter = b * b - 4 * a * cc\n\n\tif (deter < 0) return null // outside\n\tif (deter === 0) return null // tangent\n\n\tconst e = Math.sqrt(deter)\n\tconst u1 = (-b + e) / (2 * a)\n\tconst u2 = (-b - e) / (2 * a)\n\n\tif ((u1 < 0 || u1 > 1) && (u2 < 0 || u2 > 1)) {\n\t\treturn null // outside or inside\n\t\t// if ((u1 < 0 && u2 < 0) || (u1 > 1 && u2 > 1)) {\n\t\t// \treturn null // outside\n\t\t// } else return null // inside'\n\t}\n\n\tconst result: VecLike[] = []\n\n\tif (0 <= u1 && u1 <= 1) result.push(Vec.Lrp(a1, a2, u1))\n\tif (0 <= u2 && u2 <= 1) result.push(Vec.Lrp(a1, a2, u2))\n\n\tif (result.length === 0) return null // no intersection\n\n\treturn result\n}\n\n/**\n * Find the intersections between a line segment and a polyline.\n *\n * @param a1 - The segment's first point.\n * @param a2 - The segment's second point.\n * @param points - The points in the polyline.\n * @public\n */\nexport function intersectLineSegmentPolyline(a1: VecLike, a2: VecLike, points: VecLike[]) {\n\tconst result: VecLike[] = []\n\tlet segmentIntersection: VecLike | null\n\n\tfor (let i = 0, n = points.length - 1; i < n; i++) {\n\t\tsegmentIntersection = intersectLineSegmentLineSegment(a1, a2, points[i], points[i + 1])\n\t\tif (segmentIntersection) result.push(segmentIntersection)\n\t}\n\n\tif (result.length === 0) return null // no intersection\n\n\treturn result\n}\n\n/**\n * Find the intersections between a line segment and a closed polygon.\n *\n * @param a1 - The segment's first point.\n * @param a2 - The segment's second point.\n * @param points - The points in the polygon.\n * @public\n */\nexport function intersectLineSegmentPolygon(a1: VecLike, a2: VecLike, points: VecLike[]) {\n\tconst result: VecLike[] = []\n\tlet segmentIntersection: VecLike | null\n\n\tfor (let i = 1, n = points.length; i < n + 1; i++) {\n\t\tsegmentIntersection = intersectLineSegmentLineSegment(\n\t\t\ta1,\n\t\t\ta2,\n\t\t\tpoints[i - 1],\n\t\t\tpoints[i % points.length]\n\t\t)\n\n\t\tif (segmentIntersection) result.push(segmentIntersection)\n\t}\n\n\tif (result.length === 0) return null // no intersection\n\n\treturn result\n}\n\n/**\n * Find the intersections between a circle and a circle.\n *\n * @param c1 - The first circle's center.\n * @param r1 - The first circle's radius.\n * @param c2 - The second circle's center.\n * @param r2 - The second circle's radius.\n * @public\n */\nexport function intersectCircleCircle(c1: VecLike, r1: number, c2: VecLike, r2: number) {\n\tlet dx = c2.x - c1.x\n\tlet dy = c2.y - c1.y\n\tconst d = Math.sqrt(dx * dx + dy * dy),\n\t\tx = (d * d - r2 * r2 + r1 * r1) / (2 * d),\n\t\ty = Math.sqrt(r1 * r1 - x * x)\n\tdx /= d\n\tdy /= d\n\treturn [\n\t\tnew Vec(c1.x + dx * x - dy * y, c1.y + dy * x + dx * y),\n\t\tnew Vec(c1.x + dx * x + dy * y, c1.y + dy * x - dx * y),\n\t]\n}\n\n/**\n * Find the intersections between a circle and a bounding box.\n *\n * @param c - The circle's center.\n * @param r - The circle's radius.\n * @param points - The points in the polygon.\n * @public\n */\nexport function intersectCirclePolygon(c: VecLike, r: number, points: VecLike[]) {\n\tconst result: VecLike[] = []\n\tlet a: VecLike, b: VecLike, int: VecLike[] | null\n\n\tfor (let i = 0, n = points.length; i < n; i++) {\n\t\ta = points[i]\n\t\tb = points[(i + 1) % points.length]\n\t\tint = intersectLineSegmentCircle(a, b, c, r)\n\t\tif (int) result.push(...int)\n\t}\n\n\tif (result.length === 0) return null // no intersection\n\n\treturn result\n}\n\n/**\n * Find the intersections between a circle and a bounding box.\n *\n * @param c - The circle's center.\n * @param r - The circle's radius.\n * @param points - The points in the polyline.\n * @public\n */\nexport function intersectCirclePolyline(c: VecLike, r: number, points: VecLike[]) {\n\tconst result: VecLike[] = []\n\tlet a: VecLike, b: VecLike, int: VecLike[] | null\n\n\tfor (let i = 1, n = points.length; i < n; i++) {\n\t\ta = points[i - 1]\n\t\tb = points[i]\n\t\tint = intersectLineSegmentCircle(a, b, c, r)\n\t\tif (int) result.push(...int)\n\t}\n\n\tif (result.length === 0) return null // no intersection\n\n\treturn result\n}\n\n/**\n * Find the intersections between a polygon and a bounding box.\n *\n * @public\n */\nexport function intersectPolygonBounds(points: VecLike[], bounds: Box) {\n\tconst result: VecLike[] = []\n\tlet segmentIntersection: VecLike[] | null\n\n\tfor (const side of bounds.sides) {\n\t\tsegmentIntersection = intersectLineSegmentPolygon(side[0], side[1], points)\n\t\tif (segmentIntersection) result.push(...segmentIntersection)\n\t}\n\n\tif (result.length === 0) return null // no intersection\n\n\treturn result\n}\n\nfunction ccw(A: VecLike, B: VecLike, C: VecLike) {\n\treturn (C.y - A.y) * (B.x - A.x) > (B.y - A.y) * (C.x - A.x)\n}\n\n/** @public */\nexport function linesIntersect(A: VecLike, B: VecLike, C: VecLike, D: VecLike) {\n\treturn ccw(A, C, D) !== ccw(B, C, D) && ccw(A, B, C) !== ccw(A, B, D)\n}\n\n/**\n * Create a new convex polygon as the intersection of two convex polygons.\n *\n * @param polygonA - An array of points representing the first polygon.\n * @param polygonB - An array of points representing the second polygon.\n * @public\n */\nexport function intersectPolygonPolygon(\n\tpolygonA: VecLike[],\n\tpolygonB: VecLike[]\n): VecLike[] | null {\n\t// Create an empty polygon as result\n\tconst result: Map<string, VecLike> = new Map()\n\tlet a: VecLike, b: VecLike, c: VecLike, d: VecLike\n\n\t// Add all corners of PolygonA that is inside PolygonB to result\n\tfor (let i = 0, n = polygonA.length; i < n; i++) {\n\t\ta = polygonA[i]\n\t\tif (pointInPolygon(a, polygonB)) {\n\t\t\tconst id = getPointId(a)\n\t\t\tif (!result.has(id)) {\n\t\t\t\tresult.set(id, a)\n\t\t\t}\n\t\t}\n\t}\n\t// Add all corners of PolygonB that is inside PolygonA to result\n\tfor (let i = 0, n = polygonB.length; i < n; i++) {\n\t\ta = polygonB[i]\n\t\tif (pointInPolygon(a, polygonA)) {\n\t\t\tconst id = getPointId(a)\n\t\t\tif (!result.has(id)) {\n\t\t\t\tresult.set(id, a)\n\t\t\t}\n\t\t}\n\t}\n\n\t// Add all intersection points to result\n\tfor (let i = 0, n = polygonA.length; i < n; i++) {\n\t\ta = polygonA[i]\n\t\tb = polygonA[(i + 1) % polygonA.length]\n\n\t\tfor (let j = 0, m = polygonB.length; j < m; j++) {\n\t\t\tc = polygonB[j]\n\t\t\td = polygonB[(j + 1) % polygonB.length]\n\t\t\tconst intersection = intersectLineSegmentLineSegment(a, b, c, d)\n\n\t\t\tif (intersection !== null) {\n\t\t\t\tconst id = getPointId(intersection)\n\t\t\t\tif (!result.has(id)) {\n\t\t\t\t\tresult.set(id, intersection)\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\tif (result.size === 0) return null // no intersection\n\n\t// Order all points in the result counter-clockwise.\n\treturn orderClockwise([...result.values()])\n}\n\n/**\n * Find all the points where `polyA` and `polyB` intersect and returns them in an undefined order.\n * To find the polygon that's the intersection of polyA and polyB, use `intersectPolygonPolygon`\n * instead, which orders the points and includes internal points.\n *\n * @param polyA - The first polygon.\n * @param polyB - The second polygon.\n * @param isAClosed - Whether `polyA` is a closed polygon or a polyline.\n * @param isBClosed - Whether `polyB` is a closed polygon or a polyline.\n * @public\n */\nexport function intersectPolys(\n\tpolyA: VecLike[],\n\tpolyB: VecLike[],\n\tisAClosed: boolean,\n\tisBClosed: boolean\n): VecLike[] {\n\tconst result: Map<string, VecLike> = new Map()\n\n\t// Add all intersection points to result\n\tfor (let i = 0, n = isAClosed ? polyA.length : polyA.length - 1; i < n; i++) {\n\t\tconst currentA = polyA[i]\n\t\tconst nextA = polyA[(i + 1) % polyA.length]\n\n\t\tfor (let j = 0, m = isBClosed ? polyB.length : polyB.length - 1; j < m; j++) {\n\t\t\tconst currentB = polyB[j]\n\t\t\tconst nextB = polyB[(j + 1) % polyB.length]\n\t\t\tconst intersection = intersectLineSegmentLineSegment(currentA, nextA, currentB, nextB)\n\n\t\t\tif (intersection !== null) {\n\t\t\t\tconst id = getPointId(intersection)\n\t\t\t\tif (!result.has(id)) {\n\t\t\t\t\tresult.set(id, intersection)\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\treturn [...result.values()]\n}\n\nfunction getPointId(point: VecLike) {\n\treturn `${point.x},${point.y}`\n}\n\nfunction orderClockwise(points: VecLike[]): VecLike[] {\n\tconst C = Vec.Average(points)\n\treturn points.sort((A, B) => Vec.Angle(C, A) - Vec.Angle(C, B))\n}\n\n/** @public */\nexport function polygonsIntersect(a: VecLike[], b: VecLike[]) {\n\tlet a0: VecLike, a1: VecLike, b0: VecLike, b1: VecLike\n\tfor (let i = 0, n = a.length; i < n; i++) {\n\t\ta0 = a[i]\n\t\ta1 = a[(i + 1) % n]\n\t\tfor (let j = 0, m = b.length; j < m; j++) {\n\t\t\tb0 = b[j]\n\t\t\tb1 = b[(j + 1) % m]\n\t\t\tif (linesIntersect(a0, a1, b0, b1)) return true\n\t\t}\n\t}\n\treturn false\n}\n\n/** @public */\nexport function polygonIntersectsPolyline(polygon: VecLike[], polyline: VecLike[]) {\n\tlet a: VecLike, b: VecLike, c: VecLike, d: VecLike\n\tfor (let i = 0, n = polygon.length; i < n; i++) {\n\t\ta = polygon[i]\n\t\tb = polygon[(i + 1) % n]\n\n\t\tfor (let j = 1, m = polyline.length; j < m; j++) {\n\t\t\tc = polyline[j - 1]\n\t\t\td = polyline[j]\n\t\t\tif (linesIntersect(a, b, c, d)) return true\n\t\t}\n\t}\n\treturn false\n}\n"],
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