@esotericsoftware/spine-core
Version:
The official Spine Runtimes for the web.
242 lines • 40.1 kB
JavaScript
/******************************************************************************
* Spine Runtimes License Agreement
* Last updated April 5, 2025. Replaces all prior versions.
*
* Copyright (c) 2013-2025, Esoteric Software LLC
*
* Integration of the Spine Runtimes into software or otherwise creating
* derivative works of the Spine Runtimes is permitted under the terms and
* conditions of Section 2 of the Spine Editor License Agreement:
* http://esotericsoftware.com/spine-editor-license
*
* Otherwise, it is permitted to integrate the Spine Runtimes into software
* or otherwise create derivative works of the Spine Runtimes (collectively,
* "Products"), provided that each user of the Products must obtain their own
* Spine Editor license and redistribution of the Products in any form must
* include this license and copyright notice.
*
* THE SPINE RUNTIMES ARE PROVIDED BY ESOTERIC SOFTWARE LLC "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL ESOTERIC SOFTWARE LLC BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES,
* BUSINESS INTERRUPTION, OR LOSS OF USE, DATA, OR PROFITS) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THE SPINE RUNTIMES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*****************************************************************************/
import { Pool } from "./Utils.js";
export class Triangulator {
convexPolygons = new Array();
convexPolygonsIndices = new Array();
indicesArray = new Array();
isConcaveArray = new Array();
triangles = new Array();
polygonPool = new Pool(() => {
return new Array();
});
polygonIndicesPool = new Pool(() => {
return new Array();
});
triangulate(verticesArray) {
let vertices = verticesArray;
let vertexCount = verticesArray.length >> 1;
let indices = this.indicesArray;
indices.length = 0;
for (let i = 0; i < vertexCount; i++)
indices[i] = i;
let isConcave = this.isConcaveArray;
isConcave.length = 0;
for (let i = 0, n = vertexCount; i < n; ++i)
isConcave[i] = Triangulator.isConcave(i, vertexCount, vertices, indices);
let triangles = this.triangles;
triangles.length = 0;
while (vertexCount > 3) {
// Find ear tip.
let previous = vertexCount - 1, i = 0, next = 1;
while (true) {
outer: if (!isConcave[i]) {
let p1 = indices[previous] << 1, p2 = indices[i] << 1, p3 = indices[next] << 1;
let p1x = vertices[p1], p1y = vertices[p1 + 1];
let p2x = vertices[p2], p2y = vertices[p2 + 1];
let p3x = vertices[p3], p3y = vertices[p3 + 1];
for (let ii = (next + 1) % vertexCount; ii != previous; ii = (ii + 1) % vertexCount) {
if (!isConcave[ii])
continue;
let v = indices[ii] << 1;
let vx = vertices[v], vy = vertices[v + 1];
if (Triangulator.positiveArea(p3x, p3y, p1x, p1y, vx, vy)) {
if (Triangulator.positiveArea(p1x, p1y, p2x, p2y, vx, vy)) {
if (Triangulator.positiveArea(p2x, p2y, p3x, p3y, vx, vy))
break outer;
}
}
}
break;
}
if (next == 0) {
do {
if (!isConcave[i])
break;
i--;
} while (i > 0);
break;
}
previous = i;
i = next;
next = (next + 1) % vertexCount;
}
// Cut ear tip.
triangles.push(indices[(vertexCount + i - 1) % vertexCount]);
triangles.push(indices[i]);
triangles.push(indices[(i + 1) % vertexCount]);
indices.splice(i, 1);
isConcave.splice(i, 1);
vertexCount--;
let previousIndex = (vertexCount + i - 1) % vertexCount;
let nextIndex = i == vertexCount ? 0 : i;
isConcave[previousIndex] = Triangulator.isConcave(previousIndex, vertexCount, vertices, indices);
isConcave[nextIndex] = Triangulator.isConcave(nextIndex, vertexCount, vertices, indices);
}
if (vertexCount == 3) {
triangles.push(indices[2]);
triangles.push(indices[0]);
triangles.push(indices[1]);
}
return triangles;
}
decompose(verticesArray, triangles) {
let vertices = verticesArray;
let convexPolygons = this.convexPolygons;
this.polygonPool.freeAll(convexPolygons);
convexPolygons.length = 0;
let convexPolygonsIndices = this.convexPolygonsIndices;
this.polygonIndicesPool.freeAll(convexPolygonsIndices);
convexPolygonsIndices.length = 0;
let polygonIndices = this.polygonIndicesPool.obtain();
polygonIndices.length = 0;
let polygon = this.polygonPool.obtain();
polygon.length = 0;
// Merge subsequent triangles if they form a triangle fan.
let fanBaseIndex = -1, lastWinding = 0;
for (let i = 0, n = triangles.length; i < n; i += 3) {
let t1 = triangles[i] << 1, t2 = triangles[i + 1] << 1, t3 = triangles[i + 2] << 1;
let x1 = vertices[t1], y1 = vertices[t1 + 1];
let x2 = vertices[t2], y2 = vertices[t2 + 1];
let x3 = vertices[t3], y3 = vertices[t3 + 1];
// If the base of the last triangle is the same as this triangle, check if they form a convex polygon (triangle fan).
let merged = false;
if (fanBaseIndex == t1) {
let o = polygon.length - 4;
let winding1 = Triangulator.winding(polygon[o], polygon[o + 1], polygon[o + 2], polygon[o + 3], x3, y3);
let winding2 = Triangulator.winding(x3, y3, polygon[0], polygon[1], polygon[2], polygon[3]);
if (winding1 == lastWinding && winding2 == lastWinding) {
polygon.push(x3);
polygon.push(y3);
polygonIndices.push(t3);
merged = true;
}
}
// Otherwise make this triangle the new base.
if (!merged) {
if (polygon.length > 0) {
convexPolygons.push(polygon);
convexPolygonsIndices.push(polygonIndices);
}
else {
this.polygonPool.free(polygon);
this.polygonIndicesPool.free(polygonIndices);
}
polygon = this.polygonPool.obtain();
polygon.length = 0;
polygon.push(x1);
polygon.push(y1);
polygon.push(x2);
polygon.push(y2);
polygon.push(x3);
polygon.push(y3);
polygonIndices = this.polygonIndicesPool.obtain();
polygonIndices.length = 0;
polygonIndices.push(t1);
polygonIndices.push(t2);
polygonIndices.push(t3);
lastWinding = Triangulator.winding(x1, y1, x2, y2, x3, y3);
fanBaseIndex = t1;
}
}
if (polygon.length > 0) {
convexPolygons.push(polygon);
convexPolygonsIndices.push(polygonIndices);
}
// Go through the list of polygons and try to merge the remaining triangles with the found triangle fans.
for (let i = 0, n = convexPolygons.length; i < n; i++) {
polygonIndices = convexPolygonsIndices[i];
if (polygonIndices.length == 0)
continue;
let firstIndex = polygonIndices[0];
let lastIndex = polygonIndices[polygonIndices.length - 1];
polygon = convexPolygons[i];
let o = polygon.length - 4;
let prevPrevX = polygon[o], prevPrevY = polygon[o + 1];
let prevX = polygon[o + 2], prevY = polygon[o + 3];
let firstX = polygon[0], firstY = polygon[1];
let secondX = polygon[2], secondY = polygon[3];
let winding = Triangulator.winding(prevPrevX, prevPrevY, prevX, prevY, firstX, firstY);
for (let ii = 0; ii < n; ii++) {
if (ii == i)
continue;
let otherIndices = convexPolygonsIndices[ii];
if (otherIndices.length != 3)
continue;
let otherFirstIndex = otherIndices[0];
let otherSecondIndex = otherIndices[1];
let otherLastIndex = otherIndices[2];
let otherPoly = convexPolygons[ii];
let x3 = otherPoly[otherPoly.length - 2], y3 = otherPoly[otherPoly.length - 1];
if (otherFirstIndex != firstIndex || otherSecondIndex != lastIndex)
continue;
let winding1 = Triangulator.winding(prevPrevX, prevPrevY, prevX, prevY, x3, y3);
let winding2 = Triangulator.winding(x3, y3, firstX, firstY, secondX, secondY);
if (winding1 == winding && winding2 == winding) {
otherPoly.length = 0;
otherIndices.length = 0;
polygon.push(x3);
polygon.push(y3);
polygonIndices.push(otherLastIndex);
prevPrevX = prevX;
prevPrevY = prevY;
prevX = x3;
prevY = y3;
ii = 0;
}
}
}
// Remove empty polygons that resulted from the merge step above.
for (let i = convexPolygons.length - 1; i >= 0; i--) {
polygon = convexPolygons[i];
if (polygon.length == 0) {
convexPolygons.splice(i, 1);
this.polygonPool.free(polygon);
polygonIndices = convexPolygonsIndices[i];
convexPolygonsIndices.splice(i, 1);
this.polygonIndicesPool.free(polygonIndices);
}
}
return convexPolygons;
}
static isConcave(index, vertexCount, vertices, indices) {
let previous = indices[(vertexCount + index - 1) % vertexCount] << 1;
let current = indices[index] << 1;
let next = indices[(index + 1) % vertexCount] << 1;
return !this.positiveArea(vertices[previous], vertices[previous + 1], vertices[current], vertices[current + 1], vertices[next], vertices[next + 1]);
}
static positiveArea(p1x, p1y, p2x, p2y, p3x, p3y) {
return p1x * (p3y - p2y) + p2x * (p1y - p3y) + p3x * (p2y - p1y) >= 0;
}
static winding(p1x, p1y, p2x, p2y, p3x, p3y) {
let px = p2x - p1x, py = p2y - p1y;
return p3x * py - p3y * px + px * p1y - p1x * py >= 0 ? 1 : -1;
}
}
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* Spine Runtimes License Agreement\n * Last updated April 5, 2025. Replaces all prior versions.\n *\n * Copyright (c) 2013-2025, Esoteric Software LLC\n *\n * Integration of the Spine Runtimes into software or otherwise creating\n * derivative works of the Spine Runtimes is permitted under the terms and\n * conditions of Section 2 of the Spine Editor License Agreement:\n * http://esotericsoftware.com/spine-editor-license\n *\n * Otherwise, it is permitted to integrate the Spine Runtimes into software\n * or otherwise create derivative works of the Spine Runtimes (collectively,\n * \"Products\"), provided that each user of the Products must obtain their own\n * Spine Editor license and redistribution of the Products in any form must\n * include this license and copyright notice.\n *\n * THE SPINE RUNTIMES ARE PROVIDED BY ESOTERIC SOFTWARE LLC \"AS IS\" AND ANY\n * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED\n * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE\n * DISCLAIMED. IN NO EVENT SHALL ESOTERIC SOFTWARE LLC BE LIABLE FOR ANY\n * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES\n * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES,\n * BUSINESS INTERRUPTION, OR LOSS OF USE, DATA, OR PROFITS) HOWEVER CAUSED AND\n * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\n * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF\n * THE SPINE RUNTIMES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\n *****************************************************************************/\n\nimport { NumberArrayLike, Pool } from \"./Utils.js\";\n\nexport class Triangulator {\n\tprivate convexPolygons = new Array<Array<number>>();\n\tprivate convexPolygonsIndices = new Array<Array<number>>();\n\n\tprivate indicesArray = new Array<number>();\n\tprivate isConcaveArray = new Array<boolean>();\n\tprivate triangles = new Array<number>();\n\n\tprivate polygonPool = new Pool<Array<number>>(() => {\n\t\treturn new Array<number>();\n\t});\n\n\tprivate polygonIndicesPool = new Pool<Array<number>>(() => {\n\t\treturn new Array<number>();\n\t});\n\n\tpublic triangulate (verticesArray: NumberArrayLike): Array<number> {\n\t\tlet vertices = verticesArray;\n\t\tlet vertexCount = verticesArray.length >> 1;\n\n\t\tlet indices = this.indicesArray;\n\t\tindices.length = 0;\n\t\tfor (let i = 0; i < vertexCount; i++)\n\t\t\tindices[i] = i;\n\n\t\tlet isConcave = this.isConcaveArray;\n\t\tisConcave.length = 0;\n\t\tfor (let i = 0, n = vertexCount; i < n; ++i)\n\t\t\tisConcave[i] = Triangulator.isConcave(i, vertexCount, vertices, indices);\n\n\t\tlet triangles = this.triangles;\n\t\ttriangles.length = 0;\n\n\t\twhile (vertexCount > 3) {\n\t\t\t// Find ear tip.\n\t\t\tlet previous = vertexCount - 1, i = 0, next = 1;\n\t\t\twhile (true) {\n\t\t\t\touter:\n\t\t\t\tif (!isConcave[i]) {\n\t\t\t\t\tlet p1 = indices[previous] << 1, p2 = indices[i] << 1, p3 = indices[next] << 1;\n\t\t\t\t\tlet p1x = vertices[p1], p1y = vertices[p1 + 1];\n\t\t\t\t\tlet p2x = vertices[p2], p2y = vertices[p2 + 1];\n\t\t\t\t\tlet p3x = vertices[p3], p3y = vertices[p3 + 1];\n\t\t\t\t\tfor (let ii = (next + 1) % vertexCount; ii != previous; ii = (ii + 1) % vertexCount) {\n\t\t\t\t\t\tif (!isConcave[ii]) continue;\n\t\t\t\t\t\tlet v = indices[ii] << 1;\n\t\t\t\t\t\tlet vx = vertices[v], vy = vertices[v + 1];\n\t\t\t\t\t\tif (Triangulator.positiveArea(p3x, p3y, p1x, p1y, vx, vy)) {\n\t\t\t\t\t\t\tif (Triangulator.positiveArea(p1x, p1y, p2x, p2y, vx, vy)) {\n\t\t\t\t\t\t\t\tif (Triangulator.positiveArea(p2x, p2y, p3x, p3y, vx, vy)) break outer;\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\n\t\t\t\tif (next == 0) {\n\t\t\t\t\tdo {\n\t\t\t\t\t\tif (!isConcave[i]) break;\n\t\t\t\t\t\ti--;\n\t\t\t\t\t} while (i > 0);\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\n\t\t\t\tprevious = i;\n\t\t\t\ti = next;\n\t\t\t\tnext = (next + 1) % vertexCount;\n\t\t\t}\n\n\t\t\t// Cut ear tip.\n\t\t\ttriangles.push(indices[(vertexCount + i - 1) % vertexCount]);\n\t\t\ttriangles.push(indices[i]);\n\t\t\ttriangles.push(indices[(i + 1) % vertexCount]);\n\t\t\tindices.splice(i, 1);\n\t\t\tisConcave.splice(i, 1);\n\t\t\tvertexCount--;\n\n\t\t\tlet previousIndex = (vertexCount + i - 1) % vertexCount;\n\t\t\tlet nextIndex = i == vertexCount ? 0 : i;\n\t\t\tisConcave[previousIndex] = Triangulator.isConcave(previousIndex, vertexCount, vertices, indices);\n\t\t\tisConcave[nextIndex] = Triangulator.isConcave(nextIndex, vertexCount, vertices, indices);\n\t\t}\n\n\t\tif (vertexCount == 3) {\n\t\t\ttriangles.push(indices[2]);\n\t\t\ttriangles.push(indices[0]);\n\t\t\ttriangles.push(indices[1]);\n\t\t}\n\n\t\treturn triangles;\n\t}\n\n\tdecompose (verticesArray: Array<number>, triangles: Array<number>): Array<Array<number>> {\n\t\tlet vertices = verticesArray;\n\t\tlet convexPolygons = this.convexPolygons;\n\t\tthis.polygonPool.freeAll(convexPolygons);\n\t\tconvexPolygons.length = 0;\n\n\t\tlet convexPolygonsIndices = this.convexPolygonsIndices;\n\t\tthis.polygonIndicesPool.freeAll(convexPolygonsIndices);\n\t\tconvexPolygonsIndices.length = 0;\n\n\t\tlet polygonIndices = this.polygonIndicesPool.obtain();\n\t\tpolygonIndices.length = 0;\n\n\t\tlet polygon = this.polygonPool.obtain();\n\t\tpolygon.length = 0;\n\n\t\t// Merge subsequent triangles if they form a triangle fan.\n\t\tlet fanBaseIndex = -1, lastWinding = 0;\n\t\tfor (let i = 0, n = triangles.length; i < n; i += 3) {\n\t\t\tlet t1 = triangles[i] << 1, t2 = triangles[i + 1] << 1, t3 = triangles[i + 2] << 1;\n\t\t\tlet x1 = vertices[t1], y1 = vertices[t1 + 1];\n\t\t\tlet x2 = vertices[t2], y2 = vertices[t2 + 1];\n\t\t\tlet x3 = vertices[t3], y3 = vertices[t3 + 1];\n\n\t\t\t// If the base of the last triangle is the same as this triangle, check if they form a convex polygon (triangle fan).\n\t\t\tlet merged = false;\n\t\t\tif (fanBaseIndex == t1) {\n\t\t\t\tlet o = polygon.length - 4;\n\t\t\t\tlet winding1 = Triangulator.winding(polygon[o], polygon[o + 1], polygon[o + 2], polygon[o + 3], x3, y3);\n\t\t\t\tlet winding2 = Triangulator.winding(x3, y3, polygon[0], polygon[1], polygon[2], polygon[3]);\n\t\t\t\tif (winding1 == lastWinding && winding2 == lastWinding) {\n\t\t\t\t\tpolygon.push(x3);\n\t\t\t\t\tpolygon.push(y3);\n\t\t\t\t\tpolygonIndices.push(t3);\n\t\t\t\t\tmerged = true;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Otherwise make this triangle the new base.\n\t\t\tif (!merged) {\n\t\t\t\tif (polygon.length > 0) {\n\t\t\t\t\tconvexPolygons.push(polygon);\n\t\t\t\t\tconvexPolygonsIndices.push(polygonIndices);\n\t\t\t\t} else {\n\t\t\t\t\tthis.polygonPool.free(polygon)\n\t\t\t\t\tthis.polygonIndicesPool.free(polygonIndices);\n\t\t\t\t}\n\t\t\t\tpolygon = this.polygonPool.obtain();\n\t\t\t\tpolygon.length = 0;\n\t\t\t\tpolygon.push(x1);\n\t\t\t\tpolygon.push(y1);\n\t\t\t\tpolygon.push(x2);\n\t\t\t\tpolygon.push(y2);\n\t\t\t\tpolygon.push(x3);\n\t\t\t\tpolygon.push(y3);\n\t\t\t\tpolygonIndices = this.polygonIndicesPool.obtain();\n\t\t\t\tpolygonIndices.length = 0;\n\t\t\t\tpolygonIndices.push(t1);\n\t\t\t\tpolygonIndices.push(t2);\n\t\t\t\tpolygonIndices.push(t3);\n\t\t\t\tlastWinding = Triangulator.winding(x1, y1, x2, y2, x3, y3);\n\t\t\t\tfanBaseIndex = t1;\n\t\t\t}\n\t\t}\n\n\t\tif (polygon.length > 0) {\n\t\t\tconvexPolygons.push(polygon);\n\t\t\tconvexPolygonsIndices.push(polygonIndices);\n\t\t}\n\n\t\t// Go through the list of polygons and try to merge the remaining triangles with the found triangle fans.\n\t\tfor (let i = 0, n = convexPolygons.length; i < n; i++) {\n\t\t\tpolygonIndices = convexPolygonsIndices[i];\n\t\t\tif (polygonIndices.length == 0) continue;\n\t\t\tlet firstIndex = polygonIndices[0];\n\t\t\tlet lastIndex = polygonIndices[polygonIndices.length - 1];\n\n\t\t\tpolygon = convexPolygons[i];\n\t\t\tlet o = polygon.length - 4;\n\t\t\tlet prevPrevX = polygon[o], prevPrevY = polygon[o + 1];\n\t\t\tlet prevX = polygon[o + 2], prevY = polygon[o + 3];\n\t\t\tlet firstX = polygon[0], firstY = polygon[1];\n\t\t\tlet secondX = polygon[2], secondY = polygon[3];\n\t\t\tlet winding = Triangulator.winding(prevPrevX, prevPrevY, prevX, prevY, firstX, firstY);\n\n\t\t\tfor (let ii = 0; ii < n; ii++) {\n\t\t\t\tif (ii == i) continue;\n\t\t\t\tlet otherIndices = convexPolygonsIndices[ii];\n\t\t\t\tif (otherIndices.length != 3) continue;\n\t\t\t\tlet otherFirstIndex = otherIndices[0];\n\t\t\t\tlet otherSecondIndex = otherIndices[1];\n\t\t\t\tlet otherLastIndex = otherIndices[2];\n\n\t\t\t\tlet otherPoly = convexPolygons[ii];\n\t\t\t\tlet x3 = otherPoly[otherPoly.length - 2], y3 = otherPoly[otherPoly.length - 1];\n\n\t\t\t\tif (otherFirstIndex != firstIndex || otherSecondIndex != lastIndex) continue;\n\t\t\t\tlet winding1 = Triangulator.winding(prevPrevX, prevPrevY, prevX, prevY, x3, y3);\n\t\t\t\tlet winding2 = Triangulator.winding(x3, y3, firstX, firstY, secondX, secondY);\n\t\t\t\tif (winding1 == winding && winding2 == winding) {\n\t\t\t\t\totherPoly.length = 0;\n\t\t\t\t\totherIndices.length = 0;\n\t\t\t\t\tpolygon.push(x3);\n\t\t\t\t\tpolygon.push(y3);\n\t\t\t\t\tpolygonIndices.push(otherLastIndex);\n\t\t\t\t\tprevPrevX = prevX;\n\t\t\t\t\tprevPrevY = prevY;\n\t\t\t\t\tprevX = x3;\n\t\t\t\t\tprevY = y3;\n\t\t\t\t\tii = 0;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\t// Remove empty polygons that resulted from the merge step above.\n\t\tfor (let i = convexPolygons.length - 1; i >= 0; i--) {\n\t\t\tpolygon = convexPolygons[i];\n\t\t\tif (polygon.length == 0) {\n\t\t\t\tconvexPolygons.splice(i, 1);\n\t\t\t\tthis.polygonPool.free(polygon);\n\t\t\t\tpolygonIndices = convexPolygonsIndices[i]\n\t\t\t\tconvexPolygonsIndices.splice(i, 1)\n\t\t\t\tthis.polygonIndicesPool.free(polygonIndices);\n\t\t\t}\n\t\t}\n\n\t\treturn convexPolygons;\n\t}\n\n\tprivate static isConcave (index: number, vertexCount: number, vertices: NumberArrayLike, indices: NumberArrayLike): boolean {\n\t\tlet previous = indices[(vertexCount + index - 1) % vertexCount] << 1;\n\t\tlet current = indices[index] << 1;\n\t\tlet next = indices[(index + 1) % vertexCount] << 1;\n\t\treturn !this.positiveArea(vertices[previous], vertices[previous + 1], vertices[current], vertices[current + 1], vertices[next],\n\t\t\tvertices[next + 1]);\n\t}\n\n\tprivate static positiveArea (p1x: number, p1y: number, p2x: number, p2y: number, p3x: number, p3y: number): boolean {\n\t\treturn p1x * (p3y - p2y) + p2x * (p1y - p3y) + p3x * (p2y - p1y) >= 0;\n\t}\n\n\tprivate static winding (p1x: number, p1y: number, p2x: number, p2y: number, p3x: number, p3y: number): number {\n\t\tlet px = p2x - p1x, py = p2y - p1y;\n\t\treturn p3x * py - p3y * px + px * p1y - p1x * py >= 0 ? 1 : -1;\n\t}\n}\n"]}