earcut.dev.js 55 KB

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  1. (function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.earcut = f()}})(function(){var define,module,exports;return (function(){function r(e,n,t){function o(i,f){if(!n[i]){if(!e[i]){var c="function"==typeof require&&require;if(!f&&c)return c(i,!0);if(u)return u(i,!0);var a=new Error("Cannot find module '"+i+"'");throw a.code="MODULE_NOT_FOUND",a}var p=n[i]={exports:{}};e[i][0].call(p.exports,function(r){var n=e[i][1][r];return o(n||r)},p,p.exports,r,e,n,t)}return n[i].exports}for(var u="function"==typeof require&&require,i=0;i<t.length;i++)o(t[i]);return o}return r})()({1:[function(require,module,exports){
  2. 'use strict';
  3. module.exports = earcut;
  4. module.exports.default = earcut;
  5. function earcut(data, holeIndices, dim) {
  6. dim = dim || 2;
  7. var hasHoles = holeIndices && holeIndices.length,
  8. outerLen = hasHoles ? holeIndices[0] * dim : data.length,
  9. outerNode = linkedList(data, 0, outerLen, dim, true),
  10. triangles = [];
  11. if (!outerNode || outerNode.next === outerNode.prev) return triangles;
  12. var minX, minY, maxX, maxY, x, y, invSize;
  13. if (hasHoles) outerNode = eliminateHoles(data, holeIndices, outerNode, dim);
  14. // if the shape is not too simple, we'll use z-order curve hash later; calculate polygon bbox
  15. if (data.length > 80 * dim) {
  16. minX = maxX = data[0];
  17. minY = maxY = data[1];
  18. for (var i = dim; i < outerLen; i += dim) {
  19. x = data[i];
  20. y = data[i + 1];
  21. if (x < minX) minX = x;
  22. if (y < minY) minY = y;
  23. if (x > maxX) maxX = x;
  24. if (y > maxY) maxY = y;
  25. }
  26. // minX, minY and invSize are later used to transform coords into integers for z-order calculation
  27. invSize = Math.max(maxX - minX, maxY - minY);
  28. invSize = invSize !== 0 ? 32767 / invSize : 0;
  29. }
  30. earcutLinked(outerNode, triangles, dim, minX, minY, invSize, 0);
  31. return triangles;
  32. }
  33. // create a circular doubly linked list from polygon points in the specified winding order
  34. function linkedList(data, start, end, dim, clockwise) {
  35. var i, last;
  36. if (clockwise === (signedArea(data, start, end, dim) > 0)) {
  37. for (i = start; i < end; i += dim) last = insertNode(i, data[i], data[i + 1], last);
  38. } else {
  39. for (i = end - dim; i >= start; i -= dim) last = insertNode(i, data[i], data[i + 1], last);
  40. }
  41. if (last && equals(last, last.next)) {
  42. removeNode(last);
  43. last = last.next;
  44. }
  45. return last;
  46. }
  47. // eliminate colinear or duplicate points
  48. function filterPoints(start, end) {
  49. if (!start) return start;
  50. if (!end) end = start;
  51. var p = start,
  52. again;
  53. do {
  54. again = false;
  55. if (!p.steiner && (equals(p, p.next) || area(p.prev, p, p.next) === 0)) {
  56. removeNode(p);
  57. p = end = p.prev;
  58. if (p === p.next) break;
  59. again = true;
  60. } else {
  61. p = p.next;
  62. }
  63. } while (again || p !== end);
  64. return end;
  65. }
  66. // main ear slicing loop which triangulates a polygon (given as a linked list)
  67. function earcutLinked(ear, triangles, dim, minX, minY, invSize, pass) {
  68. if (!ear) return;
  69. // interlink polygon nodes in z-order
  70. if (!pass && invSize) indexCurve(ear, minX, minY, invSize);
  71. var stop = ear,
  72. prev, next;
  73. // iterate through ears, slicing them one by one
  74. while (ear.prev !== ear.next) {
  75. prev = ear.prev;
  76. next = ear.next;
  77. if (invSize ? isEarHashed(ear, minX, minY, invSize) : isEar(ear)) {
  78. // cut off the triangle
  79. triangles.push(prev.i / dim | 0);
  80. triangles.push(ear.i / dim | 0);
  81. triangles.push(next.i / dim | 0);
  82. removeNode(ear);
  83. // skipping the next vertex leads to less sliver triangles
  84. ear = next.next;
  85. stop = next.next;
  86. continue;
  87. }
  88. ear = next;
  89. // if we looped through the whole remaining polygon and can't find any more ears
  90. if (ear === stop) {
  91. // try filtering points and slicing again
  92. if (!pass) {
  93. earcutLinked(filterPoints(ear), triangles, dim, minX, minY, invSize, 1);
  94. // if this didn't work, try curing all small self-intersections locally
  95. } else if (pass === 1) {
  96. ear = cureLocalIntersections(filterPoints(ear), triangles, dim);
  97. earcutLinked(ear, triangles, dim, minX, minY, invSize, 2);
  98. // as a last resort, try splitting the remaining polygon into two
  99. } else if (pass === 2) {
  100. splitEarcut(ear, triangles, dim, minX, minY, invSize);
  101. }
  102. break;
  103. }
  104. }
  105. }
  106. // check whether a polygon node forms a valid ear with adjacent nodes
  107. function isEar(ear) {
  108. var a = ear.prev,
  109. b = ear,
  110. c = ear.next;
  111. if (area(a, b, c) >= 0) return false; // reflex, can't be an ear
  112. // now make sure we don't have other points inside the potential ear
  113. var ax = a.x, bx = b.x, cx = c.x, ay = a.y, by = b.y, cy = c.y;
  114. // triangle bbox; min & max are calculated like this for speed
  115. var x0 = ax < bx ? (ax < cx ? ax : cx) : (bx < cx ? bx : cx),
  116. y0 = ay < by ? (ay < cy ? ay : cy) : (by < cy ? by : cy),
  117. x1 = ax > bx ? (ax > cx ? ax : cx) : (bx > cx ? bx : cx),
  118. y1 = ay > by ? (ay > cy ? ay : cy) : (by > cy ? by : cy);
  119. var p = c.next;
  120. while (p !== a) {
  121. if (p.x >= x0 && p.x <= x1 && p.y >= y0 && p.y <= y1 &&
  122. pointInTriangle(ax, ay, bx, by, cx, cy, p.x, p.y) &&
  123. area(p.prev, p, p.next) >= 0) return false;
  124. p = p.next;
  125. }
  126. return true;
  127. }
  128. function isEarHashed(ear, minX, minY, invSize) {
  129. var a = ear.prev,
  130. b = ear,
  131. c = ear.next;
  132. if (area(a, b, c) >= 0) return false; // reflex, can't be an ear
  133. var ax = a.x, bx = b.x, cx = c.x, ay = a.y, by = b.y, cy = c.y;
  134. // triangle bbox; min & max are calculated like this for speed
  135. var x0 = ax < bx ? (ax < cx ? ax : cx) : (bx < cx ? bx : cx),
  136. y0 = ay < by ? (ay < cy ? ay : cy) : (by < cy ? by : cy),
  137. x1 = ax > bx ? (ax > cx ? ax : cx) : (bx > cx ? bx : cx),
  138. y1 = ay > by ? (ay > cy ? ay : cy) : (by > cy ? by : cy);
  139. // z-order range for the current triangle bbox;
  140. var minZ = zOrder(x0, y0, minX, minY, invSize),
  141. maxZ = zOrder(x1, y1, minX, minY, invSize);
  142. var p = ear.prevZ,
  143. n = ear.nextZ;
  144. // look for points inside the triangle in both directions
  145. while (p && p.z >= minZ && n && n.z <= maxZ) {
  146. if (p.x >= x0 && p.x <= x1 && p.y >= y0 && p.y <= y1 && p !== a && p !== c &&
  147. pointInTriangle(ax, ay, bx, by, cx, cy, p.x, p.y) && area(p.prev, p, p.next) >= 0) return false;
  148. p = p.prevZ;
  149. if (n.x >= x0 && n.x <= x1 && n.y >= y0 && n.y <= y1 && n !== a && n !== c &&
  150. pointInTriangle(ax, ay, bx, by, cx, cy, n.x, n.y) && area(n.prev, n, n.next) >= 0) return false;
  151. n = n.nextZ;
  152. }
  153. // look for remaining points in decreasing z-order
  154. while (p && p.z >= minZ) {
  155. if (p.x >= x0 && p.x <= x1 && p.y >= y0 && p.y <= y1 && p !== a && p !== c &&
  156. pointInTriangle(ax, ay, bx, by, cx, cy, p.x, p.y) && area(p.prev, p, p.next) >= 0) return false;
  157. p = p.prevZ;
  158. }
  159. // look for remaining points in increasing z-order
  160. while (n && n.z <= maxZ) {
  161. if (n.x >= x0 && n.x <= x1 && n.y >= y0 && n.y <= y1 && n !== a && n !== c &&
  162. pointInTriangle(ax, ay, bx, by, cx, cy, n.x, n.y) && area(n.prev, n, n.next) >= 0) return false;
  163. n = n.nextZ;
  164. }
  165. return true;
  166. }
  167. // go through all polygon nodes and cure small local self-intersections
  168. function cureLocalIntersections(start, triangles, dim) {
  169. var p = start;
  170. do {
  171. var a = p.prev,
  172. b = p.next.next;
  173. if (!equals(a, b) && intersects(a, p, p.next, b) && locallyInside(a, b) && locallyInside(b, a)) {
  174. triangles.push(a.i / dim | 0);
  175. triangles.push(p.i / dim | 0);
  176. triangles.push(b.i / dim | 0);
  177. // remove two nodes involved
  178. removeNode(p);
  179. removeNode(p.next);
  180. p = start = b;
  181. }
  182. p = p.next;
  183. } while (p !== start);
  184. return filterPoints(p);
  185. }
  186. // try splitting polygon into two and triangulate them independently
  187. function splitEarcut(start, triangles, dim, minX, minY, invSize) {
  188. // look for a valid diagonal that divides the polygon into two
  189. var a = start;
  190. do {
  191. var b = a.next.next;
  192. while (b !== a.prev) {
  193. if (a.i !== b.i && isValidDiagonal(a, b)) {
  194. // split the polygon in two by the diagonal
  195. var c = splitPolygon(a, b);
  196. // filter colinear points around the cuts
  197. a = filterPoints(a, a.next);
  198. c = filterPoints(c, c.next);
  199. // run earcut on each half
  200. earcutLinked(a, triangles, dim, minX, minY, invSize, 0);
  201. earcutLinked(c, triangles, dim, minX, minY, invSize, 0);
  202. return;
  203. }
  204. b = b.next;
  205. }
  206. a = a.next;
  207. } while (a !== start);
  208. }
  209. // link every hole into the outer loop, producing a single-ring polygon without holes
  210. function eliminateHoles(data, holeIndices, outerNode, dim) {
  211. var queue = [],
  212. i, len, start, end, list;
  213. for (i = 0, len = holeIndices.length; i < len; i++) {
  214. start = holeIndices[i] * dim;
  215. end = i < len - 1 ? holeIndices[i + 1] * dim : data.length;
  216. list = linkedList(data, start, end, dim, false);
  217. if (list === list.next) list.steiner = true;
  218. queue.push(getLeftmost(list));
  219. }
  220. queue.sort(compareX);
  221. // process holes from left to right
  222. for (i = 0; i < queue.length; i++) {
  223. outerNode = eliminateHole(queue[i], outerNode);
  224. }
  225. return outerNode;
  226. }
  227. function compareX(a, b) {
  228. return a.x - b.x;
  229. }
  230. // find a bridge between vertices that connects hole with an outer ring and and link it
  231. function eliminateHole(hole, outerNode) {
  232. var bridge = findHoleBridge(hole, outerNode);
  233. if (!bridge) {
  234. return outerNode;
  235. }
  236. var bridgeReverse = splitPolygon(bridge, hole);
  237. // filter collinear points around the cuts
  238. filterPoints(bridgeReverse, bridgeReverse.next);
  239. return filterPoints(bridge, bridge.next);
  240. }
  241. // David Eberly's algorithm for finding a bridge between hole and outer polygon
  242. function findHoleBridge(hole, outerNode) {
  243. var p = outerNode,
  244. hx = hole.x,
  245. hy = hole.y,
  246. qx = -Infinity,
  247. m;
  248. // find a segment intersected by a ray from the hole's leftmost point to the left;
  249. // segment's endpoint with lesser x will be potential connection point
  250. do {
  251. if (hy <= p.y && hy >= p.next.y && p.next.y !== p.y) {
  252. var x = p.x + (hy - p.y) * (p.next.x - p.x) / (p.next.y - p.y);
  253. if (x <= hx && x > qx) {
  254. qx = x;
  255. m = p.x < p.next.x ? p : p.next;
  256. if (x === hx) return m; // hole touches outer segment; pick leftmost endpoint
  257. }
  258. }
  259. p = p.next;
  260. } while (p !== outerNode);
  261. if (!m) return null;
  262. // look for points inside the triangle of hole point, segment intersection and endpoint;
  263. // if there are no points found, we have a valid connection;
  264. // otherwise choose the point of the minimum angle with the ray as connection point
  265. var stop = m,
  266. mx = m.x,
  267. my = m.y,
  268. tanMin = Infinity,
  269. tan;
  270. p = m;
  271. do {
  272. if (hx >= p.x && p.x >= mx && hx !== p.x &&
  273. pointInTriangle(hy < my ? hx : qx, hy, mx, my, hy < my ? qx : hx, hy, p.x, p.y)) {
  274. tan = Math.abs(hy - p.y) / (hx - p.x); // tangential
  275. if (locallyInside(p, hole) &&
  276. (tan < tanMin || (tan === tanMin && (p.x > m.x || (p.x === m.x && sectorContainsSector(m, p)))))) {
  277. m = p;
  278. tanMin = tan;
  279. }
  280. }
  281. p = p.next;
  282. } while (p !== stop);
  283. return m;
  284. }
  285. // whether sector in vertex m contains sector in vertex p in the same coordinates
  286. function sectorContainsSector(m, p) {
  287. return area(m.prev, m, p.prev) < 0 && area(p.next, m, m.next) < 0;
  288. }
  289. // interlink polygon nodes in z-order
  290. function indexCurve(start, minX, minY, invSize) {
  291. var p = start;
  292. do {
  293. if (p.z === 0) p.z = zOrder(p.x, p.y, minX, minY, invSize);
  294. p.prevZ = p.prev;
  295. p.nextZ = p.next;
  296. p = p.next;
  297. } while (p !== start);
  298. p.prevZ.nextZ = null;
  299. p.prevZ = null;
  300. sortLinked(p);
  301. }
  302. // Simon Tatham's linked list merge sort algorithm
  303. // http://www.chiark.greenend.org.uk/~sgtatham/algorithms/listsort.html
  304. function sortLinked(list) {
  305. var i, p, q, e, tail, numMerges, pSize, qSize,
  306. inSize = 1;
  307. do {
  308. p = list;
  309. list = null;
  310. tail = null;
  311. numMerges = 0;
  312. while (p) {
  313. numMerges++;
  314. q = p;
  315. pSize = 0;
  316. for (i = 0; i < inSize; i++) {
  317. pSize++;
  318. q = q.nextZ;
  319. if (!q) break;
  320. }
  321. qSize = inSize;
  322. while (pSize > 0 || (qSize > 0 && q)) {
  323. if (pSize !== 0 && (qSize === 0 || !q || p.z <= q.z)) {
  324. e = p;
  325. p = p.nextZ;
  326. pSize--;
  327. } else {
  328. e = q;
  329. q = q.nextZ;
  330. qSize--;
  331. }
  332. if (tail) tail.nextZ = e;
  333. else list = e;
  334. e.prevZ = tail;
  335. tail = e;
  336. }
  337. p = q;
  338. }
  339. tail.nextZ = null;
  340. inSize *= 2;
  341. } while (numMerges > 1);
  342. return list;
  343. }
  344. // z-order of a point given coords and inverse of the longer side of data bbox
  345. function zOrder(x, y, minX, minY, invSize) {
  346. // coords are transformed into non-negative 15-bit integer range
  347. x = (x - minX) * invSize | 0;
  348. y = (y - minY) * invSize | 0;
  349. x = (x | (x << 8)) & 0x00FF00FF;
  350. x = (x | (x << 4)) & 0x0F0F0F0F;
  351. x = (x | (x << 2)) & 0x33333333;
  352. x = (x | (x << 1)) & 0x55555555;
  353. y = (y | (y << 8)) & 0x00FF00FF;
  354. y = (y | (y << 4)) & 0x0F0F0F0F;
  355. y = (y | (y << 2)) & 0x33333333;
  356. y = (y | (y << 1)) & 0x55555555;
  357. return x | (y << 1);
  358. }
  359. // find the leftmost node of a polygon ring
  360. function getLeftmost(start) {
  361. var p = start,
  362. leftmost = start;
  363. do {
  364. if (p.x < leftmost.x || (p.x === leftmost.x && p.y < leftmost.y)) leftmost = p;
  365. p = p.next;
  366. } while (p !== start);
  367. return leftmost;
  368. }
  369. // check if a point lies within a convex triangle
  370. function pointInTriangle(ax, ay, bx, by, cx, cy, px, py) {
  371. return (cx - px) * (ay - py) >= (ax - px) * (cy - py) &&
  372. (ax - px) * (by - py) >= (bx - px) * (ay - py) &&
  373. (bx - px) * (cy - py) >= (cx - px) * (by - py);
  374. }
  375. // check if a diagonal between two polygon nodes is valid (lies in polygon interior)
  376. function isValidDiagonal(a, b) {
  377. return a.next.i !== b.i && a.prev.i !== b.i && !intersectsPolygon(a, b) && // dones't intersect other edges
  378. (locallyInside(a, b) && locallyInside(b, a) && middleInside(a, b) && // locally visible
  379. (area(a.prev, a, b.prev) || area(a, b.prev, b)) || // does not create opposite-facing sectors
  380. equals(a, b) && area(a.prev, a, a.next) > 0 && area(b.prev, b, b.next) > 0); // special zero-length case
  381. }
  382. // signed area of a triangle
  383. function area(p, q, r) {
  384. return (q.y - p.y) * (r.x - q.x) - (q.x - p.x) * (r.y - q.y);
  385. }
  386. // check if two points are equal
  387. function equals(p1, p2) {
  388. return p1.x === p2.x && p1.y === p2.y;
  389. }
  390. // check if two segments intersect
  391. function intersects(p1, q1, p2, q2) {
  392. var o1 = sign(area(p1, q1, p2));
  393. var o2 = sign(area(p1, q1, q2));
  394. var o3 = sign(area(p2, q2, p1));
  395. var o4 = sign(area(p2, q2, q1));
  396. if (o1 !== o2 && o3 !== o4) return true; // general case
  397. if (o1 === 0 && onSegment(p1, p2, q1)) return true; // p1, q1 and p2 are collinear and p2 lies on p1q1
  398. if (o2 === 0 && onSegment(p1, q2, q1)) return true; // p1, q1 and q2 are collinear and q2 lies on p1q1
  399. if (o3 === 0 && onSegment(p2, p1, q2)) return true; // p2, q2 and p1 are collinear and p1 lies on p2q2
  400. if (o4 === 0 && onSegment(p2, q1, q2)) return true; // p2, q2 and q1 are collinear and q1 lies on p2q2
  401. return false;
  402. }
  403. // for collinear points p, q, r, check if point q lies on segment pr
  404. function onSegment(p, q, r) {
  405. return q.x <= Math.max(p.x, r.x) && q.x >= Math.min(p.x, r.x) && q.y <= Math.max(p.y, r.y) && q.y >= Math.min(p.y, r.y);
  406. }
  407. function sign(num) {
  408. return num > 0 ? 1 : num < 0 ? -1 : 0;
  409. }
  410. // check if a polygon diagonal intersects any polygon segments
  411. function intersectsPolygon(a, b) {
  412. var p = a;
  413. do {
  414. if (p.i !== a.i && p.next.i !== a.i && p.i !== b.i && p.next.i !== b.i &&
  415. intersects(p, p.next, a, b)) return true;
  416. p = p.next;
  417. } while (p !== a);
  418. return false;
  419. }
  420. // check if a polygon diagonal is locally inside the polygon
  421. function locallyInside(a, b) {
  422. return area(a.prev, a, a.next) < 0 ?
  423. area(a, b, a.next) >= 0 && area(a, a.prev, b) >= 0 :
  424. area(a, b, a.prev) < 0 || area(a, a.next, b) < 0;
  425. }
  426. // check if the middle point of a polygon diagonal is inside the polygon
  427. function middleInside(a, b) {
  428. var p = a,
  429. inside = false,
  430. px = (a.x + b.x) / 2,
  431. py = (a.y + b.y) / 2;
  432. do {
  433. if (((p.y > py) !== (p.next.y > py)) && p.next.y !== p.y &&
  434. (px < (p.next.x - p.x) * (py - p.y) / (p.next.y - p.y) + p.x))
  435. inside = !inside;
  436. p = p.next;
  437. } while (p !== a);
  438. return inside;
  439. }
  440. // link two polygon vertices with a bridge; if the vertices belong to the same ring, it splits polygon into two;
  441. // if one belongs to the outer ring and another to a hole, it merges it into a single ring
  442. function splitPolygon(a, b) {
  443. var a2 = new Node(a.i, a.x, a.y),
  444. b2 = new Node(b.i, b.x, b.y),
  445. an = a.next,
  446. bp = b.prev;
  447. a.next = b;
  448. b.prev = a;
  449. a2.next = an;
  450. an.prev = a2;
  451. b2.next = a2;
  452. a2.prev = b2;
  453. bp.next = b2;
  454. b2.prev = bp;
  455. return b2;
  456. }
  457. // create a node and optionally link it with previous one (in a circular doubly linked list)
  458. function insertNode(i, x, y, last) {
  459. var p = new Node(i, x, y);
  460. if (!last) {
  461. p.prev = p;
  462. p.next = p;
  463. } else {
  464. p.next = last.next;
  465. p.prev = last;
  466. last.next.prev = p;
  467. last.next = p;
  468. }
  469. return p;
  470. }
  471. function removeNode(p) {
  472. p.next.prev = p.prev;
  473. p.prev.next = p.next;
  474. if (p.prevZ) p.prevZ.nextZ = p.nextZ;
  475. if (p.nextZ) p.nextZ.prevZ = p.prevZ;
  476. }
  477. function Node(i, x, y) {
  478. // vertex index in coordinates array
  479. this.i = i;
  480. // vertex coordinates
  481. this.x = x;
  482. this.y = y;
  483. // previous and next vertex nodes in a polygon ring
  484. this.prev = null;
  485. this.next = null;
  486. // z-order curve value
  487. this.z = 0;
  488. // previous and next nodes in z-order
  489. this.prevZ = null;
  490. this.nextZ = null;
  491. // indicates whether this is a steiner point
  492. this.steiner = false;
  493. }
  494. // return a percentage difference between the polygon area and its triangulation area;
  495. // used to verify correctness of triangulation
  496. earcut.deviation = function (data, holeIndices, dim, triangles) {
  497. var hasHoles = holeIndices && holeIndices.length;
  498. var outerLen = hasHoles ? holeIndices[0] * dim : data.length;
  499. var polygonArea = Math.abs(signedArea(data, 0, outerLen, dim));
  500. if (hasHoles) {
  501. for (var i = 0, len = holeIndices.length; i < len; i++) {
  502. var start = holeIndices[i] * dim;
  503. var end = i < len - 1 ? holeIndices[i + 1] * dim : data.length;
  504. polygonArea -= Math.abs(signedArea(data, start, end, dim));
  505. }
  506. }
  507. var trianglesArea = 0;
  508. for (i = 0; i < triangles.length; i += 3) {
  509. var a = triangles[i] * dim;
  510. var b = triangles[i + 1] * dim;
  511. var c = triangles[i + 2] * dim;
  512. trianglesArea += Math.abs(
  513. (data[a] - data[c]) * (data[b + 1] - data[a + 1]) -
  514. (data[a] - data[b]) * (data[c + 1] - data[a + 1]));
  515. }
  516. return polygonArea === 0 && trianglesArea === 0 ? 0 :
  517. Math.abs((trianglesArea - polygonArea) / polygonArea);
  518. };
  519. function signedArea(data, start, end, dim) {
  520. var sum = 0;
  521. for (var i = start, j = end - dim; i < end; i += dim) {
  522. sum += (data[j] - data[i]) * (data[i + 1] + data[j + 1]);
  523. j = i;
  524. }
  525. return sum;
  526. }
  527. // turn a polygon in a multi-dimensional array form (e.g. as in GeoJSON) into a form Earcut accepts
  528. earcut.flatten = function (data) {
  529. var dim = data[0][0].length,
  530. result = {vertices: [], holes: [], dimensions: dim},
  531. holeIndex = 0;
  532. for (var i = 0; i < data.length; i++) {
  533. for (var j = 0; j < data[i].length; j++) {
  534. for (var d = 0; d < dim; d++) result.vertices.push(data[i][j][d]);
  535. }
  536. if (i > 0) {
  537. holeIndex += data[i - 1].length;
  538. result.holes.push(holeIndex);
  539. }
  540. }
  541. return result;
  542. };
  543. },{}]},{},[1])(1)
  544. });
  545. //# sourceMappingURL=data:application/json;charset=utf-8;base64,{"version":3,"sources":["node_modules/browser-pack/_prelude.js","src/earcut.js"],"names":[],"mappings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file":"generated.js","sourceRoot":"","sourcesContent":["(function(){function r(e,n,t){function o(i,f){if(!n[i]){if(!e[i]){var c=\"function\"==typeof require&&require;if(!f&&c)return c(i,!0);if(u)return u(i,!0);var a=new Error(\"Cannot find module '\"+i+\"'\");throw a.code=\"MODULE_NOT_FOUND\",a}var p=n[i]={exports:{}};e[i][0].call(p.exports,function(r){var n=e[i][1][r];return o(n||r)},p,p.exports,r,e,n,t)}return n[i].exports}for(var u=\"function\"==typeof require&&require,i=0;i<t.length;i++)o(t[i]);return o}return r})()","'use strict';\n\nmodule.exports = earcut;\nmodule.exports.default = earcut;\n\nfunction earcut(data, holeIndices, dim) {\n\n    dim = dim || 2;\n\n    var hasHoles = holeIndices && holeIndices.length,\n        outerLen = hasHoles ? holeIndices[0] * dim : data.length,\n        outerNode = linkedList(data, 0, outerLen, dim, true),\n        triangles = [];\n\n    if (!outerNode || outerNode.next === outerNode.prev) return triangles;\n\n    var minX, minY, maxX, maxY, x, y, invSize;\n\n    if (hasHoles) outerNode = eliminateHoles(data, holeIndices, outerNode, dim);\n\n    // if the shape is not too simple, we'll use z-order curve hash later; calculate polygon bbox\n    if (data.length > 80 * dim) {\n        minX = maxX = data[0];\n        minY = maxY = data[1];\n\n        for (var i = dim; i < outerLen; i += dim) {\n            x = data[i];\n            y = data[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        }\n\n        // minX, minY and invSize are later used to transform coords into integers for z-order calculation\n        invSize = Math.max(maxX - minX, maxY - minY);\n        invSize = invSize !== 0 ? 32767 / invSize : 0;\n    }\n\n    earcutLinked(outerNode, triangles, dim, minX, minY, invSize, 0);\n\n    return triangles;\n}\n\n// create a circular doubly linked list from polygon points in the specified winding order\nfunction linkedList(data, start, end, dim, clockwise) {\n    var i, last;\n\n    if (clockwise === (signedArea(data, start, end, dim) > 0)) {\n        for (i = start; i < end; i += dim) last = insertNode(i, data[i], data[i + 1], last);\n    } else {\n        for (i = end - dim; i >= start; i -= dim) last = insertNode(i, data[i], data[i + 1], last);\n    }\n\n    if (last && equals(last, last.next)) {\n        removeNode(last);\n        last = last.next;\n    }\n\n    return last;\n}\n\n// eliminate colinear or duplicate points\nfunction filterPoints(start, end) {\n    if (!start) return start;\n    if (!end) end = start;\n\n    var p = start,\n        again;\n    do {\n        again = false;\n\n        if (!p.steiner && (equals(p, p.next) || area(p.prev, p, p.next) === 0)) {\n            removeNode(p);\n            p = end = p.prev;\n            if (p === p.next) break;\n            again = true;\n\n        } else {\n            p = p.next;\n        }\n    } while (again || p !== end);\n\n    return end;\n}\n\n// main ear slicing loop which triangulates a polygon (given as a linked list)\nfunction earcutLinked(ear, triangles, dim, minX, minY, invSize, pass) {\n    if (!ear) return;\n\n    // interlink polygon nodes in z-order\n    if (!pass && invSize) indexCurve(ear, minX, minY, invSize);\n\n    var stop = ear,\n        prev, next;\n\n    // iterate through ears, slicing them one by one\n    while (ear.prev !== ear.next) {\n        prev = ear.prev;\n        next = ear.next;\n\n        if (invSize ? isEarHashed(ear, minX, minY, invSize) : isEar(ear)) {\n            // cut off the triangle\n            triangles.push(prev.i / dim | 0);\n            triangles.push(ear.i / dim | 0);\n            triangles.push(next.i / dim | 0);\n\n            removeNode(ear);\n\n            // skipping the next vertex leads to less sliver triangles\n            ear = next.next;\n            stop = next.next;\n\n            continue;\n        }\n\n        ear = next;\n\n        // if we looped through the whole remaining polygon and can't find any more ears\n        if (ear === stop) {\n            // try filtering points and slicing again\n            if (!pass) {\n                earcutLinked(filterPoints(ear), triangles, dim, minX, minY, invSize, 1);\n\n            // if this didn't work, try curing all small self-intersections locally\n            } else if (pass === 1) {\n                ear = cureLocalIntersections(filterPoints(ear), triangles, dim);\n                earcutLinked(ear, triangles, dim, minX, minY, invSize, 2);\n\n            // as a last resort, try splitting the remaining polygon into two\n            } else if (pass === 2) {\n                splitEarcut(ear, triangles, dim, minX, minY, invSize);\n            }\n\n            break;\n        }\n    }\n}\n\n// check whether a polygon node forms a valid ear with adjacent nodes\nfunction isEar(ear) {\n    var a = ear.prev,\n        b = ear,\n        c = ear.next;\n\n    if (area(a, b, c) >= 0) return false; // reflex, can't be an ear\n\n    // now make sure we don't have other points inside the potential ear\n    var ax = a.x, bx = b.x, cx = c.x, ay = a.y, by = b.y, cy = c.y;\n\n    // triangle bbox; min & max are calculated like this for speed\n    var x0 = ax < bx ? (ax < cx ? ax : cx) : (bx < cx ? bx : cx),\n        y0 = ay < by ? (ay < cy ? ay : cy) : (by < cy ? by : cy),\n        x1 = ax > bx ? (ax > cx ? ax : cx) : (bx > cx ? bx : cx),\n        y1 = ay > by ? (ay > cy ? ay : cy) : (by > cy ? by : cy);\n\n    var p = c.next;\n    while (p !== a) {\n        if (p.x >= x0 && p.x <= x1 && p.y >= y0 && p.y <= y1 &&\n            pointInTriangle(ax, ay, bx, by, cx, cy, p.x, p.y) &&\n            area(p.prev, p, p.next) >= 0) return false;\n        p = p.next;\n    }\n\n    return true;\n}\n\nfunction isEarHashed(ear, minX, minY, invSize) {\n    var a = ear.prev,\n        b = ear,\n        c = ear.next;\n\n    if (area(a, b, c) >= 0) return false; // reflex, can't be an ear\n\n    var ax = a.x, bx = b.x, cx = c.x, ay = a.y, by = b.y, cy = c.y;\n\n    // triangle bbox; min & max are calculated like this for speed\n    var x0 = ax < bx ? (ax < cx ? ax : cx) : (bx < cx ? bx : cx),\n        y0 = ay < by ? (ay < cy ? ay : cy) : (by < cy ? by : cy),\n        x1 = ax > bx ? (ax > cx ? ax : cx) : (bx > cx ? bx : cx),\n        y1 = ay > by ? (ay > cy ? ay : cy) : (by > cy ? by : cy);\n\n    // z-order range for the current triangle bbox;\n    var minZ = zOrder(x0, y0, minX, minY, invSize),\n        maxZ = zOrder(x1, y1, minX, minY, invSize);\n\n    var p = ear.prevZ,\n        n = ear.nextZ;\n\n    // look for points inside the triangle in both directions\n    while (p && p.z >= minZ && n && n.z <= maxZ) {\n        if (p.x >= x0 && p.x <= x1 && p.y >= y0 && p.y <= y1 && p !== a && p !== c &&\n            pointInTriangle(ax, ay, bx, by, cx, cy, p.x, p.y) && area(p.prev, p, p.next) >= 0) return false;\n        p = p.prevZ;\n\n        if (n.x >= x0 && n.x <= x1 && n.y >= y0 && n.y <= y1 && n !== a && n !== c &&\n            pointInTriangle(ax, ay, bx, by, cx, cy, n.x, n.y) && area(n.prev, n, n.next) >= 0) return false;\n        n = n.nextZ;\n    }\n\n    // look for remaining points in decreasing z-order\n    while (p && p.z >= minZ) {\n        if (p.x >= x0 && p.x <= x1 && p.y >= y0 && p.y <= y1 && p !== a && p !== c &&\n            pointInTriangle(ax, ay, bx, by, cx, cy, p.x, p.y) && area(p.prev, p, p.next) >= 0) return false;\n        p = p.prevZ;\n    }\n\n    // look for remaining points in increasing z-order\n    while (n && n.z <= maxZ) {\n        if (n.x >= x0 && n.x <= x1 && n.y >= y0 && n.y <= y1 && n !== a && n !== c &&\n            pointInTriangle(ax, ay, bx, by, cx, cy, n.x, n.y) && area(n.prev, n, n.next) >= 0) return false;\n        n = n.nextZ;\n    }\n\n    return true;\n}\n\n// go through all polygon nodes and cure small local self-intersections\nfunction cureLocalIntersections(start, triangles, dim) {\n    var p = start;\n    do {\n        var a = p.prev,\n            b = p.next.next;\n\n        if (!equals(a, b) && intersects(a, p, p.next, b) && locallyInside(a, b) && locallyInside(b, a)) {\n\n            triangles.push(a.i / dim | 0);\n            triangles.push(p.i / dim | 0);\n            triangles.push(b.i / dim | 0);\n\n            // remove two nodes involved\n            removeNode(p);\n            removeNode(p.next);\n\n            p = start = b;\n        }\n        p = p.next;\n    } while (p !== start);\n\n    return filterPoints(p);\n}\n\n// try splitting polygon into two and triangulate them independently\nfunction splitEarcut(start, triangles, dim, minX, minY, invSize) {\n    // look for a valid diagonal that divides the polygon into two\n    var a = start;\n    do {\n        var b = a.next.next;\n        while (b !== a.prev) {\n            if (a.i !== b.i && isValidDiagonal(a, b)) {\n                // split the polygon in two by the diagonal\n                var c = splitPolygon(a, b);\n\n                // filter colinear points around the cuts\n                a = filterPoints(a, a.next);\n                c = filterPoints(c, c.next);\n\n                // run earcut on each half\n                earcutLinked(a, triangles, dim, minX, minY, invSize, 0);\n                earcutLinked(c, triangles, dim, minX, minY, invSize, 0);\n                return;\n            }\n            b = b.next;\n        }\n        a = a.next;\n    } while (a !== start);\n}\n\n// link every hole into the outer loop, producing a single-ring polygon without holes\nfunction eliminateHoles(data, holeIndices, outerNode, dim) {\n    var queue = [],\n        i, len, start, end, list;\n\n    for (i = 0, len = holeIndices.length; i < len; i++) {\n        start = holeIndices[i] * dim;\n        end = i < len - 1 ? holeIndices[i + 1] * dim : data.length;\n        list = linkedList(data, start, end, dim, false);\n        if (list === list.next) list.steiner = true;\n        queue.push(getLeftmost(list));\n    }\n\n    queue.sort(compareX);\n\n    // process holes from left to right\n    for (i = 0; i < queue.length; i++) {\n        outerNode = eliminateHole(queue[i], outerNode);\n    }\n\n    return outerNode;\n}\n\nfunction compareX(a, b) {\n    return a.x - b.x;\n}\n\n// find a bridge between vertices that connects hole with an outer ring and and link it\nfunction eliminateHole(hole, outerNode) {\n    var bridge = findHoleBridge(hole, outerNode);\n    if (!bridge) {\n        return outerNode;\n    }\n\n    var bridgeReverse = splitPolygon(bridge, hole);\n\n    // filter collinear points around the cuts\n    filterPoints(bridgeReverse, bridgeReverse.next);\n    return filterPoints(bridge, bridge.next);\n}\n\n// David Eberly's algorithm for finding a bridge between hole and outer polygon\nfunction findHoleBridge(hole, outerNode) {\n    var p = outerNode,\n        hx = hole.x,\n        hy = hole.y,\n        qx = -Infinity,\n        m;\n\n    // find a segment intersected by a ray from the hole's leftmost point to the left;\n    // segment's endpoint with lesser x will be potential connection point\n    do {\n        if (hy <= p.y && hy >= p.next.y && p.next.y !== p.y) {\n            var x = p.x + (hy - p.y) * (p.next.x - p.x) / (p.next.y - p.y);\n            if (x <= hx && x > qx) {\n                qx = x;\n                m = p.x < p.next.x ? p : p.next;\n                if (x === hx) return m; // hole touches outer segment; pick leftmost endpoint\n            }\n        }\n        p = p.next;\n    } while (p !== outerNode);\n\n    if (!m) return null;\n\n    // look for points inside the triangle of hole point, segment intersection and endpoint;\n    // if there are no points found, we have a valid connection;\n    // otherwise choose the point of the minimum angle with the ray as connection point\n\n    var stop = m,\n        mx = m.x,\n        my = m.y,\n        tanMin = Infinity,\n        tan;\n\n    p = m;\n\n    do {\n        if (hx >= p.x && p.x >= mx && hx !== p.x &&\n                pointInTriangle(hy < my ? hx : qx, hy, mx, my, hy < my ? qx : hx, hy, p.x, p.y)) {\n\n            tan = Math.abs(hy - p.y) / (hx - p.x); // tangential\n\n            if (locallyInside(p, hole) &&\n                (tan < tanMin || (tan === tanMin && (p.x > m.x || (p.x === m.x && sectorContainsSector(m, p)))))) {\n                m = p;\n                tanMin = tan;\n            }\n        }\n\n        p = p.next;\n    } while (p !== stop);\n\n    return m;\n}\n\n// whether sector in vertex m contains sector in vertex p in the same coordinates\nfunction sectorContainsSector(m, p) {\n    return area(m.prev, m, p.prev) < 0 && area(p.next, m, m.next) < 0;\n}\n\n// interlink polygon nodes in z-order\nfunction indexCurve(start, minX, minY, invSize) {\n    var p = start;\n    do {\n        if (p.z === 0) p.z = zOrder(p.x, p.y, minX, minY, invSize);\n        p.prevZ = p.prev;\n        p.nextZ = p.next;\n        p = p.next;\n    } while (p !== start);\n\n    p.prevZ.nextZ = null;\n    p.prevZ = null;\n\n    sortLinked(p);\n}\n\n// Simon Tatham's linked list merge sort algorithm\n// http://www.chiark.greenend.org.uk/~sgtatham/algorithms/listsort.html\nfunction sortLinked(list) {\n    var i, p, q, e, tail, numMerges, pSize, qSize,\n        inSize = 1;\n\n    do {\n        p = list;\n        list = null;\n        tail = null;\n        numMerges = 0;\n\n        while (p) {\n            numMerges++;\n            q = p;\n            pSize = 0;\n            for (i = 0; i < inSize; i++) {\n                pSize++;\n                q = q.nextZ;\n                if (!q) break;\n            }\n            qSize = inSize;\n\n            while (pSize > 0 || (qSize > 0 && q)) {\n\n                if (pSize !== 0 && (qSize === 0 || !q || p.z <= q.z)) {\n                    e = p;\n                    p = p.nextZ;\n                    pSize--;\n                } else {\n                    e = q;\n                    q = q.nextZ;\n                    qSize--;\n                }\n\n                if (tail) tail.nextZ = e;\n                else list = e;\n\n                e.prevZ = tail;\n                tail = e;\n            }\n\n            p = q;\n        }\n\n        tail.nextZ = null;\n        inSize *= 2;\n\n    } while (numMerges > 1);\n\n    return list;\n}\n\n// z-order of a point given coords and inverse of the longer side of data bbox\nfunction zOrder(x, y, minX, minY, invSize) {\n    // coords are transformed into non-negative 15-bit integer range\n    x = (x - minX) * invSize | 0;\n    y = (y - minY) * invSize | 0;\n\n    x = (x | (x << 8)) & 0x00FF00FF;\n    x = (x | (x << 4)) & 0x0F0F0F0F;\n    x = (x | (x << 2)) & 0x33333333;\n    x = (x | (x << 1)) & 0x55555555;\n\n    y = (y | (y << 8)) & 0x00FF00FF;\n    y = (y | (y << 4)) & 0x0F0F0F0F;\n    y = (y | (y << 2)) & 0x33333333;\n    y = (y | (y << 1)) & 0x55555555;\n\n    return x | (y << 1);\n}\n\n// find the leftmost node of a polygon ring\nfunction getLeftmost(start) {\n    var p = start,\n        leftmost = start;\n    do {\n        if (p.x < leftmost.x || (p.x === leftmost.x && p.y < leftmost.y)) leftmost = p;\n        p = p.next;\n    } while (p !== start);\n\n    return leftmost;\n}\n\n// check if a point lies within a convex triangle\nfunction pointInTriangle(ax, ay, bx, by, cx, cy, px, py) {\n    return (cx - px) * (ay - py) >= (ax - px) * (cy - py) &&\n           (ax - px) * (by - py) >= (bx - px) * (ay - py) &&\n           (bx - px) * (cy - py) >= (cx - px) * (by - py);\n}\n\n// check if a diagonal between two polygon nodes is valid (lies in polygon interior)\nfunction isValidDiagonal(a, b) {\n    return a.next.i !== b.i && a.prev.i !== b.i && !intersectsPolygon(a, b) && // dones't intersect other edges\n           (locallyInside(a, b) && locallyInside(b, a) && middleInside(a, b) && // locally visible\n            (area(a.prev, a, b.prev) || area(a, b.prev, b)) || // does not create opposite-facing sectors\n            equals(a, b) && area(a.prev, a, a.next) > 0 && area(b.prev, b, b.next) > 0); // special zero-length case\n}\n\n// signed area of a triangle\nfunction area(p, q, r) {\n    return (q.y - p.y) * (r.x - q.x) - (q.x - p.x) * (r.y - q.y);\n}\n\n// check if two points are equal\nfunction equals(p1, p2) {\n    return p1.x === p2.x && p1.y === p2.y;\n}\n\n// check if two segments intersect\nfunction intersects(p1, q1, p2, q2) {\n    var o1 = sign(area(p1, q1, p2));\n    var o2 = sign(area(p1, q1, q2));\n    var o3 = sign(area(p2, q2, p1));\n    var o4 = sign(area(p2, q2, q1));\n\n    if (o1 !== o2 && o3 !== o4) return true; // general case\n\n    if (o1 === 0 && onSegment(p1, p2, q1)) return true; // p1, q1 and p2 are collinear and p2 lies on p1q1\n    if (o2 === 0 && onSegment(p1, q2, q1)) return true; // p1, q1 and q2 are collinear and q2 lies on p1q1\n    if (o3 === 0 && onSegment(p2, p1, q2)) return true; // p2, q2 and p1 are collinear and p1 lies on p2q2\n    if (o4 === 0 && onSegment(p2, q1, q2)) return true; // p2, q2 and q1 are collinear and q1 lies on p2q2\n\n    return false;\n}\n\n// for collinear points p, q, r, check if point q lies on segment pr\nfunction onSegment(p, q, r) {\n    return q.x <= Math.max(p.x, r.x) && q.x >= Math.min(p.x, r.x) && q.y <= Math.max(p.y, r.y) && q.y >= Math.min(p.y, r.y);\n}\n\nfunction sign(num) {\n    return num > 0 ? 1 : num < 0 ? -1 : 0;\n}\n\n// check if a polygon diagonal intersects any polygon segments\nfunction intersectsPolygon(a, b) {\n    var p = a;\n    do {\n        if (p.i !== a.i && p.next.i !== a.i && p.i !== b.i && p.next.i !== b.i &&\n                intersects(p, p.next, a, b)) return true;\n        p = p.next;\n    } while (p !== a);\n\n    return false;\n}\n\n// check if a polygon diagonal is locally inside the polygon\nfunction locallyInside(a, b) {\n    return area(a.prev, a, a.next) < 0 ?\n        area(a, b, a.next) >= 0 && area(a, a.prev, b) >= 0 :\n        area(a, b, a.prev) < 0 || area(a, a.next, b) < 0;\n}\n\n// check if the middle point of a polygon diagonal is inside the polygon\nfunction middleInside(a, b) {\n    var p = a,\n        inside = false,\n        px = (a.x + b.x) / 2,\n        py = (a.y + b.y) / 2;\n    do {\n        if (((p.y > py) !== (p.next.y > py)) && p.next.y !== p.y &&\n                (px < (p.next.x - p.x) * (py - p.y) / (p.next.y - p.y) + p.x))\n            inside = !inside;\n        p = p.next;\n    } while (p !== a);\n\n    return inside;\n}\n\n// link two polygon vertices with a bridge; if the vertices belong to the same ring, it splits polygon into two;\n// if one belongs to the outer ring and another to a hole, it merges it into a single ring\nfunction splitPolygon(a, b) {\n    var a2 = new Node(a.i, a.x, a.y),\n        b2 = new Node(b.i, b.x, b.y),\n        an = a.next,\n        bp = b.prev;\n\n    a.next = b;\n    b.prev = a;\n\n    a2.next = an;\n    an.prev = a2;\n\n    b2.next = a2;\n    a2.prev = b2;\n\n    bp.next = b2;\n    b2.prev = bp;\n\n    return b2;\n}\n\n// create a node and optionally link it with previous one (in a circular doubly linked list)\nfunction insertNode(i, x, y, last) {\n    var p = new Node(i, x, y);\n\n    if (!last) {\n        p.prev = p;\n        p.next = p;\n\n    } else {\n        p.next = last.next;\n        p.prev = last;\n        last.next.prev = p;\n        last.next = p;\n    }\n    return p;\n}\n\nfunction removeNode(p) {\n    p.next.prev = p.prev;\n    p.prev.next = p.next;\n\n    if (p.prevZ) p.prevZ.nextZ = p.nextZ;\n    if (p.nextZ) p.nextZ.prevZ = p.prevZ;\n}\n\nfunction Node(i, x, y) {\n    // vertex index in coordinates array\n    this.i = i;\n\n    // vertex coordinates\n    this.x = x;\n    this.y = y;\n\n    // previous and next vertex nodes in a polygon ring\n    this.prev = null;\n    this.next = null;\n\n    // z-order curve value\n    this.z = 0;\n\n    // previous and next nodes in z-order\n    this.prevZ = null;\n    this.nextZ = null;\n\n    // indicates whether this is a steiner point\n    this.steiner = false;\n}\n\n// return a percentage difference between the polygon area and its triangulation area;\n// used to verify correctness of triangulation\nearcut.deviation = function (data, holeIndices, dim, triangles) {\n    var hasHoles = holeIndices && holeIndices.length;\n    var outerLen = hasHoles ? holeIndices[0] * dim : data.length;\n\n    var polygonArea = Math.abs(signedArea(data, 0, outerLen, dim));\n    if (hasHoles) {\n        for (var i = 0, len = holeIndices.length; i < len; i++) {\n            var start = holeIndices[i] * dim;\n            var end = i < len - 1 ? holeIndices[i + 1] * dim : data.length;\n            polygonArea -= Math.abs(signedArea(data, start, end, dim));\n        }\n    }\n\n    var trianglesArea = 0;\n    for (i = 0; i < triangles.length; i += 3) {\n        var a = triangles[i] * dim;\n        var b = triangles[i + 1] * dim;\n        var c = triangles[i + 2] * dim;\n        trianglesArea += Math.abs(\n            (data[a] - data[c]) * (data[b + 1] - data[a + 1]) -\n            (data[a] - data[b]) * (data[c + 1] - data[a + 1]));\n    }\n\n    return polygonArea === 0 && trianglesArea === 0 ? 0 :\n        Math.abs((trianglesArea - polygonArea) / polygonArea);\n};\n\nfunction signedArea(data, start, end, dim) {\n    var sum = 0;\n    for (var i = start, j = end - dim; i < end; i += dim) {\n        sum += (data[j] - data[i]) * (data[i + 1] + data[j + 1]);\n        j = i;\n    }\n    return sum;\n}\n\n// turn a polygon in a multi-dimensional array form (e.g. as in GeoJSON) into a form Earcut accepts\nearcut.flatten = function (data) {\n    var dim = data[0][0].length,\n        result = {vertices: [], holes: [], dimensions: dim},\n        holeIndex = 0;\n\n    for (var i = 0; i < data.length; i++) {\n        for (var j = 0; j < data[i].length; j++) {\n            for (var d = 0; d < dim; d++) result.vertices.push(data[i][j][d]);\n        }\n        if (i > 0) {\n            holeIndex += data[i - 1].length;\n            result.holes.push(holeIndex);\n        }\n    }\n    return result;\n};\n"]}