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i < n; i++) {\n            const p = points[i];\n            coords[2 * i] = getX(p);\n            coords[2 * i + 1] = getY(p);\n        }\n\n        return new Delaunator(coords);\n    }\n\n    constructor(coords) {\n        const n = coords.length >> 1;\n        if (n > 0 && typeof coords[0] !== 'number') throw new Error('Expected coords to contain numbers.');\n\n        this.coords = coords;\n\n        // arrays that will store the triangulation graph\n        const maxTriangles = Math.max(2 * n - 5, 0);\n        this._triangles = new Uint32Array(maxTriangles * 3);\n        this._halfedges = new Int32Array(maxTriangles * 3);\n\n        // temporary arrays for tracking the edges of the advancing convex hull\n        this._hashSize = Math.ceil(Math.sqrt(n));\n        this._hullPrev = new Uint32Array(n); // edge to prev edge\n        this._hullNext = new Uint32Array(n); // edge to next edge\n        this._hullTri = new Uint32Array(n); // edge to adjacent triangle\n        this._hullHash = new Int32Array(this._hashSize).fill(-1); // angular edge hash\n\n        // temporary arrays for sorting points\n        this._ids = new Uint32Array(n);\n        this._dists = new Float64Array(n);\n\n        this.update();\n    }\n\n    update() {\n        const {coords, _hullPrev: hullPrev, _hullNext: hullNext, _hullTri: hullTri, _hullHash: hullHash} =  this;\n        const n = coords.length >> 1;\n\n        // populate an array of point indices; calculate input data bbox\n        let minX = Infinity;\n        let minY = Infinity;\n        let maxX = -Infinity;\n        let maxY = -Infinity;\n\n        for (let i = 0; i < n; i++) {\n            const x = coords[2 * i];\n            const y = coords[2 * i + 1];\n            if (x < minX) minX = x;\n            if (y < minY) minY = y;\n            if (x > maxX) maxX = x;\n            if (y > maxY) maxY = y;\n            this._ids[i] = i;\n        }\n        const cx = (minX + maxX) / 2;\n        const cy = (minY + maxY) / 2;\n\n        let minDist = Infinity;\n        let i0, i1, i2;\n\n        // pick a seed point close to the center\n        for (let i = 0; i < n; i++) {\n            const d = dist(cx, cy, coords[2 * i], coords[2 * i + 1]);\n            if (d < minDist) {\n                i0 = i;\n                minDist = d;\n            }\n        }\n        const i0x = coords[2 * i0];\n        const i0y = coords[2 * i0 + 1];\n\n        minDist = Infinity;\n\n        // find the point closest to the seed\n        for (let i = 0; i < n; i++) {\n            if (i === i0) continue;\n            const d = dist(i0x, i0y, coords[2 * i], coords[2 * i + 1]);\n            if (d < minDist && d > 0) {\n                i1 = i;\n                minDist = d;\n            }\n        }\n        let i1x = coords[2 * i1];\n        let i1y = coords[2 * i1 + 1];\n\n        let minRadius = Infinity;\n\n        // find the third point which forms the smallest circumcircle with the first two\n        for (let i = 0; i < n; i++) {\n            if (i === i0 || i === i1) continue;\n            const r = circumradius(i0x, i0y, i1x, i1y, coords[2 * i], coords[2 * i + 1]);\n            if (r < minRadius) {\n                i2 = i;\n                minRadius = r;\n            }\n        }\n        let i2x = coords[2 * i2];\n        let i2y = coords[2 * i2 + 1];\n\n        if (minRadius === Infinity) {\n            // order collinear points by dx (or dy if all x are identical)\n            // and return the list as a hull\n            for (let i = 0; i < n; i++) {\n                this._dists[i] = (coords[2 * i] - coords[0]) || (coords[2 * i + 1] - coords[1]);\n            }\n            quicksort(this._ids, this._dists, 0, n - 1);\n            const hull = new Uint32Array(n);\n            let j = 0;\n            for (let i = 0, d0 = -Infinity; i < n; i++) {\n                const id = this._ids[i];\n                if (this._dists[id] > d0) {\n                    hull[j++] = id;\n                    d0 = this._dists[id];\n                }\n            }\n            this.hull = hull.subarray(0, j);\n            this.triangles = new Uint32Array(0);\n            this.halfedges = new Uint32Array(0);\n            return;\n        }\n\n        // swap the order of the seed points for counter-clockwise orientation\n        if (orient2d(i0x, i0y, i1x, i1y, i2x, i2y) < 0) {\n            const i = i1;\n            const x = i1x;\n            const y = i1y;\n            i1 = i2;\n            i1x = i2x;\n            i1y = i2y;\n            i2 = i;\n            i2x = x;\n            i2y = y;\n        }\n\n        const center = circumcenter(i0x, i0y, i1x, i1y, i2x, i2y);\n        this._cx = center.x;\n        this._cy = center.y;\n\n        for (let i = 0; i < n; i++) {\n            this._dists[i] = dist(coords[2 * i], coords[2 * i + 1], center.x, center.y);\n        }\n\n        // sort the points by distance from the seed triangle circumcenter\n        quicksort(this._ids, this._dists, 0, n - 1);\n\n        // set up the seed triangle as the starting hull\n        this._hullStart = i0;\n        let hullSize = 3;\n\n        hullNext[i0] = hullPrev[i2] = i1;\n        hullNext[i1] = hullPrev[i0] = i2;\n        hullNext[i2] = hullPrev[i1] = i0;\n\n        hullTri[i0] = 0;\n        hullTri[i1] = 1;\n        hullTri[i2] = 2;\n\n        hullHash.fill(-1);\n        hullHash[this._hashKey(i0x, i0y)] = i0;\n        hullHash[this._hashKey(i1x, i1y)] = i1;\n        hullHash[this._hashKey(i2x, i2y)] = i2;\n\n        this.trianglesLen = 0;\n        this._addTriangle(i0, i1, i2, -1, -1, -1);\n\n        for (let k = 0, xp, yp; k < this._ids.length; k++) {\n            const i = this._ids[k];\n            const x = coords[2 * i];\n            const y = coords[2 * i + 1];\n\n            // skip near-duplicate points\n            if (k > 0 && Math.abs(x - xp) <= EPSILON && Math.abs(y - yp) <= EPSILON) continue;\n            xp = x;\n            yp = y;\n\n            // skip seed triangle points\n            if (i === i0 || i === i1 || i === i2) continue;\n\n            // find a visible edge on the convex hull using edge hash\n            let start = 0;\n            for (let j = 0, key = this._hashKey(x, y); j < this._hashSize; j++) {\n                start = hullHash[(key + j) % this._hashSize];\n                if (start !== -1 && start !== hullNext[start]) break;\n            }\n\n            start = hullPrev[start];\n            let e = start, q;\n            while (q = hullNext[e], orient2d(x, y, coords[2 * e], coords[2 * e + 1], coords[2 * q], coords[2 * q + 1]) >= 0) {\n                e = q;\n                if (e === start) {\n                    e = -1;\n                    break;\n                }\n            }\n            if (e === -1) continue; // likely a near-duplicate point; skip it\n\n            // add the first triangle from the point\n            let t = this._addTriangle(e, i, hullNext[e], -1, -1, hullTri[e]);\n\n            // recursively flip triangles from the point until they satisfy the Delaunay condition\n            hullTri[i] = this._legalize(t + 2);\n            hullTri[e] = t; // keep track of boundary triangles on the hull\n            hullSize++;\n\n            // walk forward through the hull, adding more triangles and flipping recursively\n            let n = hullNext[e];\n            while (q = hullNext[n], orient2d(x, y, coords[2 * n], coords[2 * n + 1], coords[2 * q], coords[2 * q + 1]) < 0) {\n                t = this._addTriangle(n, i, q, hullTri[i], -1, hullTri[n]);\n                hullTri[i] = this._legalize(t + 2);\n                hullNext[n] = n; // mark as removed\n                hullSize--;\n                n = q;\n            }\n\n            // walk backward from the other side, adding more triangles and flipping\n            if (e === start) {\n                while (q = hullPrev[e], orient2d(x, y, coords[2 * q], coords[2 * q + 1], coords[2 * e], coords[2 * e + 1]) < 0) {\n                    t = this._addTriangle(q, i, e, -1, hullTri[e], hullTri[q]);\n                    this._legalize(t + 2);\n                    hullTri[q] = t;\n                    hullNext[e] = e; // mark as removed\n                    hullSize--;\n                    e = q;\n                }\n            }\n\n            // update the hull indices\n            this._hullStart = hullPrev[i] = e;\n            hullNext[e] = hullPrev[n] = i;\n            hullNext[i] = n;\n\n            // save the two new edges in the hash table\n            hullHash[this._hashKey(x, y)] = i;\n            hullHash[this._hashKey(coords[2 * e], coords[2 * e + 1])] = e;\n        }\n\n        this.hull = new Uint32Array(hullSize);\n        for (let i = 0, e = this._hullStart; i < hullSize; i++) {\n            this.hull[i] = e;\n            e = hullNext[e];\n        }\n\n        // trim typed triangle mesh arrays\n        this.triangles = this._triangles.subarray(0, this.trianglesLen);\n        this.halfedges = this._halfedges.subarray(0, this.trianglesLen);\n    }\n\n    _hashKey(x, y) {\n        return Math.floor(pseudoAngle(x - this._cx, y - this._cy) * this._hashSize) % this._hashSize;\n    }\n\n    _legalize(a) {\n        const {_triangles: triangles, _halfedges: halfedges, coords} = this;\n\n        let i = 0;\n        let ar = 0;\n\n        // recursion eliminated with a fixed-size stack\n        while (true) {\n            const b = halfedges[a];\n\n            /* if the pair of triangles doesn't satisfy the Delaunay condition\n             * (p1 is inside the circumcircle of [p0, pl, pr]), flip them,\n             * then do the same check/flip recursively for the new pair of triangles\n             *\n             *           pl                    pl\n             *          /||\\                  /  \\\n             *       al/ || \\bl            al/    \\a\n             *        /  ||  \\              /      \\\n             *       /  a||b  \\    flip    /___ar___\\\n             *     p0\\   ||   /p1   =>   p0\\---bl---/p1\n             *        \\  ||  /              \\      /\n             *       ar\\ || /br             b\\    /br\n             *          \\||/                  \\  /\n             *           pr                    pr\n             */\n            const a0 = a - a % 3;\n            ar = a0 + (a + 2) % 3;\n\n            if (b === -1) { // convex hull edge\n                if (i === 0) break;\n                a = EDGE_STACK[--i];\n                continue;\n            }\n\n            const b0 = b - b % 3;\n            const al = a0 + (a + 1) % 3;\n            const bl = b0 + (b + 2) % 3;\n\n            const p0 = triangles[ar];\n            const pr = triangles[a];\n            const pl = triangles[al];\n            const p1 = triangles[bl];\n\n            const illegal = inCircle(\n                coords[2 * p0], coords[2 * p0 + 1],\n                coords[2 * pr], coords[2 * pr + 1],\n                coords[2 * pl], coords[2 * pl + 1],\n                coords[2 * p1], coords[2 * p1 + 1]);\n\n            if (illegal) {\n                triangles[a] = p1;\n                triangles[b] = p0;\n\n                const hbl = halfedges[bl];\n\n                // edge swapped on the other side of the hull (rare); fix the halfedge reference\n                if (hbl === -1) {\n                    let e = this._hullStart;\n                    do {\n                        if (this._hullTri[e] === bl) {\n                            this._hullTri[e] = a;\n                            break;\n                        }\n                        e = this._hullPrev[e];\n                    } while (e !== this._hullStart);\n                }\n                this._link(a, hbl);\n                this._link(b, halfedges[ar]);\n                this._link(ar, bl);\n\n                const br = b0 + (b + 1) % 3;\n\n                // don't worry about hitting the cap: it can only happen on extremely degenerate input\n                if (i < EDGE_STACK.length) {\n                    EDGE_STACK[i++] = br;\n                }\n            } else {\n                if (i === 0) break;\n                a = EDGE_STACK[--i];\n            }\n        }\n\n        return ar;\n    }\n\n    _link(a, b) {\n        this._halfedges[a] = b;\n        if (b !== -1) this._halfedges[b] = a;\n    }\n\n    // add a new triangle given vertex indices and adjacent half-edge ids\n    _addTriangle(i0, i1, i2, a, b, c) {\n        const t = this.trianglesLen;\n\n        this._triangles[t] = i0;\n        this._triangles[t + 1] = i1;\n        this._triangles[t + 2] = i2;\n\n        this._link(t, a);\n        this._link(t + 1, b);\n        this._link(t + 2, c);\n\n        this.trianglesLen += 3;\n\n        return t;\n    }\n}\n\n// monotonically increases with real angle, but doesn't need expensive trigonometry\nfunction pseudoAngle(dx, dy) {\n    const p = dx / (Math.abs(dx) + Math.abs(dy));\n    return (dy > 0 ? 3 - p : 1 + p) / 4; // [0..1]\n}\n\nfunction dist(ax, ay, bx, by) {\n    const dx = ax - bx;\n    const dy = ay - by;\n    return dx * dx + dy * dy;\n}\n\nfunction inCircle(ax, ay, bx, by, cx, cy, px, py) {\n    const dx = ax - px;\n    const dy = ay - py;\n    const ex = bx - px;\n    const ey = by - py;\n    const fx = cx - px;\n    const fy = cy - py;\n\n    const ap = dx * dx + dy * dy;\n    const bp = ex * ex + ey * ey;\n    const cp = fx * fx + fy * fy;\n\n    return dx * (ey * cp - bp * fy) -\n           dy * (ex * cp - bp * fx) +\n           ap * (ex * fy - ey * fx) < 0;\n}\n\nfunction circumradius(ax, ay, bx, by, cx, cy) {\n    const dx = bx - ax;\n    const dy = by - ay;\n    const ex = cx - ax;\n    const ey = cy - ay;\n\n    const bl = dx * dx + dy * dy;\n    const cl = ex * ex + ey * ey;\n    const d = 0.5 / (dx * ey - dy * ex);\n\n    const x = (ey * bl - dy * cl) * d;\n    const y = (dx * cl - ex * bl) * d;\n\n    return x * x + y * y;\n}\n\nfunction circumcenter(ax, ay, bx, by, cx, cy) {\n    const dx = bx - ax;\n    const dy = by - ay;\n    const ex = cx - ax;\n    const ey = cy - ay;\n\n    const bl = dx * dx + dy * dy;\n    const cl = ex * ex + ey * ey;\n    const d = 0.5 / (dx * ey - dy * ex);\n\n    const x = ax + (ey * bl - dy * cl) * d;\n    const y = ay + (dx * cl - ex * bl) * d;\n\n    return {x, y};\n}\n\nfunction quicksort(ids, dists, left, right) {\n    if (right - left <= 20) {\n        for (let i = left + 1; i <= right; i++) {\n            const temp = ids[i];\n            const tempDist = dists[temp];\n            let j = i - 1;\n            while (j >= left && dists[ids[j]] > tempDist) ids[j + 1] = ids[j--];\n            ids[j + 1] = temp;\n        }\n    } else {\n        const median = (left + right) >> 1;\n        let i = left + 1;\n        let j = right;\n        swap(ids, median, i);\n        if (dists[ids[left]] > dists[ids[right]]) swap(ids, left, right);\n        if (dists[ids[i]] > dists[ids[right]]) swap(ids, i, right);\n        if (dists[ids[left]] > dists[ids[i]]) swap(ids, left, i);\n\n        const temp = ids[i];\n        const tempDist = dists[temp];\n        while (true) {\n            do i++; while (dists[ids[i]] < tempDist);\n            do j--; while (dists[ids[j]] > tempDist);\n            if (j < i) break;\n            swap(ids, i, j);\n        }\n        ids[left + 1] = ids[j];\n        ids[j] = temp;\n\n        if (right - i + 1 >= j - left) {\n            quicksort(ids, dists, i, right);\n            quicksort(ids, dists, left, j - 1);\n        } else {\n            quicksort(ids, dists, left, j - 1);\n            quicksort(ids, dists, i, right);\n        }\n    }\n}\n\nfunction swap(arr, i, j) {\n    const tmp = arr[i];\n    arr[i] = arr[j];\n    arr[j] = tmp;\n}\n\nfunction defaultGetX(p) {\n    return p[0];\n}\nfunction defaultGetY(p) {\n    return p[1];\n}\n"],"names":[],"sourceRoot":""}