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earcut - npm Package Compare versions
Comparing version 2.2.3 to 2.2.4
@@ -38,6 +38,6 @@ (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){ | ||
| invSize = Math.max(maxX - minX, maxY - minY); | ||
| invSize = invSize !== 0 ? 1 / invSize : 0; | ||
| invSize = invSize !== 0 ? 32767 / invSize : 0; | ||
| } | ||
| earcutLinked(outerNode, triangles, dim, minX, minY, invSize); | ||
| earcutLinked(outerNode, triangles, dim, minX, minY, invSize, 0); | ||
@@ -106,5 +106,5 @@ return triangles; | ||
| // cut off the triangle | ||
| triangles.push(prev.i / dim); | ||
| triangles.push(ear.i / dim); | ||
| triangles.push(next.i / dim); | ||
| triangles.push(prev.i / dim | 0); | ||
| triangles.push(ear.i / dim | 0); | ||
| triangles.push(next.i / dim | 0); | ||
@@ -152,6 +152,14 @@ removeNode(ear); | ||
| // now make sure we don't have other points inside the potential ear | ||
| var p = ear.next.next; | ||
| var ax = a.x, bx = b.x, cx = c.x, ay = a.y, by = b.y, cy = c.y; | ||
| while (p !== ear.prev) { | ||
| if (pointInTriangle(a.x, a.y, b.x, b.y, c.x, c.y, p.x, p.y) && | ||
| // triangle bbox; min & max are calculated like this for speed | ||
| var x0 = ax < bx ? (ax < cx ? ax : cx) : (bx < cx ? bx : cx), | ||
| y0 = ay < by ? (ay < cy ? ay : cy) : (by < cy ? by : cy), | ||
| x1 = ax > bx ? (ax > cx ? ax : cx) : (bx > cx ? bx : cx), | ||
| y1 = ay > by ? (ay > cy ? ay : cy) : (by > cy ? by : cy); | ||
| var p = c.next; | ||
| while (p !== a) { | ||
| if (p.x >= x0 && p.x <= x1 && p.y >= y0 && p.y <= y1 && | ||
| pointInTriangle(ax, ay, bx, by, cx, cy, p.x, p.y) && | ||
| area(p.prev, p, p.next) >= 0) return false; | ||
@@ -171,11 +179,13 @@ p = p.next; | ||
| var ax = a.x, bx = b.x, cx = c.x, ay = a.y, by = b.y, cy = c.y; | ||
| // triangle bbox; min & max are calculated like this for speed | ||
| var minTX = a.x < b.x ? (a.x < c.x ? a.x : c.x) : (b.x < c.x ? b.x : c.x), | ||
| minTY = a.y < b.y ? (a.y < c.y ? a.y : c.y) : (b.y < c.y ? b.y : c.y), | ||
| maxTX = a.x > b.x ? (a.x > c.x ? a.x : c.x) : (b.x > c.x ? b.x : c.x), | ||
| maxTY = a.y > b.y ? (a.y > c.y ? a.y : c.y) : (b.y > c.y ? b.y : c.y); | ||
| var x0 = ax < bx ? (ax < cx ? ax : cx) : (bx < cx ? bx : cx), | ||
| y0 = ay < by ? (ay < cy ? ay : cy) : (by < cy ? by : cy), | ||
| x1 = ax > bx ? (ax > cx ? ax : cx) : (bx > cx ? bx : cx), | ||
| y1 = ay > by ? (ay > cy ? ay : cy) : (by > cy ? by : cy); | ||
| // z-order range for the current triangle bbox; | ||
| var minZ = zOrder(minTX, minTY, minX, minY, invSize), | ||
| maxZ = zOrder(maxTX, maxTY, minX, minY, invSize); | ||
| var minZ = zOrder(x0, y0, minX, minY, invSize), | ||
| maxZ = zOrder(x1, y1, minX, minY, invSize); | ||
@@ -187,10 +197,8 @@ var p = ear.prevZ, | ||
| while (p && p.z >= minZ && n && n.z <= maxZ) { | ||
| if (p !== ear.prev && p !== ear.next && | ||
| pointInTriangle(a.x, a.y, b.x, b.y, c.x, c.y, p.x, p.y) && | ||
| area(p.prev, p, p.next) >= 0) return false; | ||
| if (p.x >= x0 && p.x <= x1 && p.y >= y0 && p.y <= y1 && p !== a && p !== c && | ||
| pointInTriangle(ax, ay, bx, by, cx, cy, p.x, p.y) && area(p.prev, p, p.next) >= 0) return false; | ||
| p = p.prevZ; | ||
| if (n !== ear.prev && n !== ear.next && | ||
| pointInTriangle(a.x, a.y, b.x, b.y, c.x, c.y, n.x, n.y) && | ||
| area(n.prev, n, n.next) >= 0) return false; | ||
| if (n.x >= x0 && n.x <= x1 && n.y >= y0 && n.y <= y1 && n !== a && n !== c && | ||
| pointInTriangle(ax, ay, bx, by, cx, cy, n.x, n.y) && area(n.prev, n, n.next) >= 0) return false; | ||
| n = n.nextZ; | ||
@@ -201,5 +209,4 @@ } | ||
| while (p && p.z >= minZ) { | ||
| if (p !== ear.prev && p !== ear.next && | ||
| pointInTriangle(a.x, a.y, b.x, b.y, c.x, c.y, p.x, p.y) && | ||
| area(p.prev, p, p.next) >= 0) return false; | ||
| if (p.x >= x0 && p.x <= x1 && p.y >= y0 && p.y <= y1 && p !== a && p !== c && | ||
| pointInTriangle(ax, ay, bx, by, cx, cy, p.x, p.y) && area(p.prev, p, p.next) >= 0) return false; | ||
| p = p.prevZ; | ||
@@ -210,5 +217,4 @@ } | ||
| while (n && n.z <= maxZ) { | ||
| if (n !== ear.prev && n !== ear.next && | ||
| pointInTriangle(a.x, a.y, b.x, b.y, c.x, c.y, n.x, n.y) && | ||
| area(n.prev, n, n.next) >= 0) return false; | ||
| if (n.x >= x0 && n.x <= x1 && n.y >= y0 && n.y <= y1 && n !== a && n !== c && | ||
| pointInTriangle(ax, ay, bx, by, cx, cy, n.x, n.y) && area(n.prev, n, n.next) >= 0) return false; | ||
| n = n.nextZ; | ||
@@ -229,5 +235,5 @@ } | ||
| triangles.push(a.i / dim); | ||
| triangles.push(p.i / dim); | ||
| triangles.push(b.i / dim); | ||
| triangles.push(a.i / dim | 0); | ||
| triangles.push(p.i / dim | 0); | ||
| triangles.push(b.i / dim | 0); | ||
@@ -262,4 +268,4 @@ // remove two nodes involved | ||
| // run earcut on each half | ||
| earcutLinked(a, triangles, dim, minX, minY, invSize); | ||
| earcutLinked(c, triangles, dim, minX, minY, invSize); | ||
| earcutLinked(a, triangles, dim, minX, minY, invSize, 0); | ||
| earcutLinked(c, triangles, dim, minX, minY, invSize, 0); | ||
| return; | ||
@@ -291,3 +297,2 @@ } | ||
| outerNode = eliminateHole(queue[i], outerNode); | ||
| outerNode = filterPoints(outerNode, outerNode.next); | ||
| } | ||
@@ -312,7 +317,4 @@ | ||
| // filter collinear points around the cuts | ||
| var filteredBridge = filterPoints(bridge, bridge.next); | ||
| filterPoints(bridgeReverse, bridgeReverse.next); | ||
| // Check if input node was removed by the filtering | ||
| return outerNode === bridge ? filteredBridge : outerNode; | ||
| return filterPoints(bridge, bridge.next); | ||
| } | ||
@@ -335,7 +337,4 @@ | ||
| qx = x; | ||
| if (x === hx) { | ||
| if (hy === p.y) return p; | ||
| if (hy === p.next.y) return p.next; | ||
| } | ||
| m = p.x < p.next.x ? p : p.next; | ||
| if (x === hx) return m; // hole touches outer segment; pick leftmost endpoint | ||
| } | ||
@@ -348,4 +347,2 @@ } | ||
| if (hx === qx) return m; // hole touches outer segment; pick leftmost endpoint | ||
| // look for points inside the triangle of hole point, segment intersection and endpoint; | ||
@@ -391,3 +388,3 @@ // if there are no points found, we have a valid connection; | ||
| do { | ||
| if (p.z === null) p.z = zOrder(p.x, p.y, minX, minY, invSize); | ||
| if (p.z === 0) p.z = zOrder(p.x, p.y, minX, minY, invSize); | ||
| p.prevZ = p.prev; | ||
@@ -460,4 +457,4 @@ p.nextZ = p.next; | ||
| // coords are transformed into non-negative 15-bit integer range | ||
| x = 32767 * (x - minX) * invSize; | ||
| y = 32767 * (y - minY) * invSize; | ||
| x = (x - minX) * invSize | 0; | ||
| y = (y - minY) * invSize | 0; | ||
@@ -491,5 +488,5 @@ x = (x | (x << 8)) & 0x00FF00FF; | ||
| function pointInTriangle(ax, ay, bx, by, cx, cy, px, py) { | ||
| return (cx - px) * (ay - py) - (ax - px) * (cy - py) >= 0 && | ||
| (ax - px) * (by - py) - (bx - px) * (ay - py) >= 0 && | ||
| (bx - px) * (cy - py) - (cx - px) * (by - py) >= 0; | ||
| return (cx - px) * (ay - py) >= (ax - px) * (cy - py) && | ||
| (ax - px) * (by - py) >= (bx - px) * (ay - py) && | ||
| (bx - px) * (cy - py) >= (cx - px) * (by - py); | ||
| } | ||
@@ -637,3 +634,3 @@ | ||
| // z-order curve value | ||
| this.z = null; | ||
| this.z = 0; | ||
@@ -707,2 +704,2 @@ // previous and next nodes in z-order | ||
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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 ? 1 / invSize : 0;\n    }\n\n    earcutLinked(outerNode, triangles, dim, minX, minY, invSize);\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);\n            triangles.push(ear.i / dim);\n            triangles.push(next.i / dim);\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 p = ear.next.next;\n\n    while (p !== ear.prev) {\n        if (pointInTriangle(a.x, a.y, b.x, b.y, c.x, c.y, 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    // triangle bbox; min & max are calculated like this for speed\n    var minTX = a.x < b.x ? (a.x < c.x ? a.x : c.x) : (b.x < c.x ? b.x : c.x),\n        minTY = a.y < b.y ? (a.y < c.y ? a.y : c.y) : (b.y < c.y ? b.y : c.y),\n        maxTX = a.x > b.x ? (a.x > c.x ? a.x : c.x) : (b.x > c.x ? b.x : c.x),\n        maxTY = a.y > b.y ? (a.y > c.y ? a.y : c.y) : (b.y > c.y ? b.y : c.y);\n\n    // z-order range for the current triangle bbox;\n    var minZ = zOrder(minTX, minTY, minX, minY, invSize),\n        maxZ = zOrder(maxTX, maxTY, 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 !== ear.prev && p !== ear.next &&\n            pointInTriangle(a.x, a.y, b.x, b.y, c.x, c.y, p.x, p.y) &&\n            area(p.prev, p, p.next) >= 0) return false;\n        p = p.prevZ;\n\n        if (n !== ear.prev && n !== ear.next &&\n            pointInTriangle(a.x, a.y, b.x, b.y, c.x, c.y, n.x, n.y) &&\n            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 !== ear.prev && p !== ear.next &&\n            pointInTriangle(a.x, a.y, b.x, b.y, c.x, c.y, p.x, p.y) &&\n            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 !== ear.prev && n !== ear.next &&\n            pointInTriangle(a.x, a.y, b.x, b.y, c.x, c.y, n.x, n.y) &&\n            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);\n            triangles.push(p.i / dim);\n            triangles.push(b.i / dim);\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);\n                earcutLinked(c, triangles, dim, minX, minY, invSize);\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        outerNode = filterPoints(outerNode, outerNode.next);\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    var filteredBridge = filterPoints(bridge, bridge.next);\n    filterPoints(bridgeReverse, bridgeReverse.next);\n\n    // Check if input node was removed by the filtering\n    return outerNode === bridge ? filteredBridge : outerNode;\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                if (x === hx) {\n                    if (hy === p.y) return p;\n                    if (hy === p.next.y) return p.next;\n                }\n                m = p.x < p.next.x ? p : p.next;\n            }\n        }\n        p = p.next;\n    } while (p !== outerNode);\n\n    if (!m) return null;\n\n    if (hx === qx) return m; // hole touches outer segment; pick leftmost endpoint\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 === null) 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 = 32767 * (x - minX) * invSize;\n    y = 32767 * (y - minY) * invSize;\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) >= 0 &&\n           (ax - px) * (by - py) - (bx - px) * (ay - py) >= 0 &&\n           (bx - px) * (cy - py) - (cx - px) * (by - py) >= 0;\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 = null;\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"]} | ||
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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"]} |
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| { | ||
| "name": "earcut", | ||
| "version": "2.2.3", | ||
| "version": "2.2.4", | ||
| "description": "The fastest and smallest JavaScript polygon triangulation library for your WebGL apps", | ||
@@ -27,16 +27,13 @@ "main": "src/earcut.js", | ||
| "browserify": "^17.0.0", | ||
| "c8": "^7.7.3", | ||
| "c8": "^7.11.3", | ||
| "coveralls": "^3.1.1", | ||
| "eslint": "^7.30.0", | ||
| "eslint": "^8.19.0", | ||
| "eslint-config-mourner": "^2.0.3", | ||
| "mkdirp": "^1.0.4", | ||
| "tape": "^5.2.2", | ||
| "uglify-js": "^3.13.10", | ||
| "tape": "^5.5.3", | ||
| "uglify-js": "^3.16.2", | ||
| "watchify": "^4.0.0" | ||
| }, | ||
| "eslintConfig": { | ||
| "extends": "mourner", | ||
| "rules": { | ||
| "no-unmodified-loop-condition": 0 | ||
| } | ||
| "extends": "mourner" | ||
| }, | ||
@@ -43,0 +40,0 @@ "repository": { |
| ## Earcut | ||
| The fastest and smallest JavaScript polygon triangulation library. 2.5KB gzipped. | ||
| The fastest and smallest JavaScript polygon triangulation library. 3KB gzipped. | ||
@@ -98,4 +98,4 @@ [](https://travis-ci.org/mapbox/earcut) | ||
| - [development build](https://unpkg.com/earcut@2.2.2/dist/earcut.dev.js) | ||
| - [minified production build](https://unpkg.com/earcut@2.2.2/dist/earcut.min.js) | ||
| - [development build](https://unpkg.com/earcut@2.2.4/dist/earcut.dev.js) | ||
| - [minified production build](https://unpkg.com/earcut@2.2.4/dist/earcut.min.js) | ||
@@ -120,2 +120,11 @@ Running tests: | ||
| ##### 2.2.4 (Jul 5, 2022) | ||
| - Improved performance by 10–15%. | ||
| - Fixed another rare race condition that could lead to an infinite loop. | ||
| ##### 2.2.3 (Jul 8, 2021) | ||
| - Fixed a rare race condition that could lead to an infinite loop. | ||
| ##### 2.2.2 (Jan 21, 2020) | ||
@@ -122,0 +131,0 @@ |
@@ -37,6 +37,6 @@ 'use strict'; | ||
| invSize = Math.max(maxX - minX, maxY - minY); | ||
| invSize = invSize !== 0 ? 1 / invSize : 0; | ||
| invSize = invSize !== 0 ? 32767 / invSize : 0; | ||
| } | ||
| earcutLinked(outerNode, triangles, dim, minX, minY, invSize); | ||
| earcutLinked(outerNode, triangles, dim, minX, minY, invSize, 0); | ||
@@ -105,5 +105,5 @@ return triangles; | ||
| // cut off the triangle | ||
| triangles.push(prev.i / dim); | ||
| triangles.push(ear.i / dim); | ||
| triangles.push(next.i / dim); | ||
| triangles.push(prev.i / dim | 0); | ||
| triangles.push(ear.i / dim | 0); | ||
| triangles.push(next.i / dim | 0); | ||
@@ -151,6 +151,14 @@ removeNode(ear); | ||
| // now make sure we don't have other points inside the potential ear | ||
| var p = ear.next.next; | ||
| var ax = a.x, bx = b.x, cx = c.x, ay = a.y, by = b.y, cy = c.y; | ||
| while (p !== ear.prev) { | ||
| if (pointInTriangle(a.x, a.y, b.x, b.y, c.x, c.y, p.x, p.y) && | ||
| // triangle bbox; min & max are calculated like this for speed | ||
| var x0 = ax < bx ? (ax < cx ? ax : cx) : (bx < cx ? bx : cx), | ||
| y0 = ay < by ? (ay < cy ? ay : cy) : (by < cy ? by : cy), | ||
| x1 = ax > bx ? (ax > cx ? ax : cx) : (bx > cx ? bx : cx), | ||
| y1 = ay > by ? (ay > cy ? ay : cy) : (by > cy ? by : cy); | ||
| var p = c.next; | ||
| while (p !== a) { | ||
| if (p.x >= x0 && p.x <= x1 && p.y >= y0 && p.y <= y1 && | ||
| pointInTriangle(ax, ay, bx, by, cx, cy, p.x, p.y) && | ||
| area(p.prev, p, p.next) >= 0) return false; | ||
@@ -170,11 +178,13 @@ p = p.next; | ||
| var ax = a.x, bx = b.x, cx = c.x, ay = a.y, by = b.y, cy = c.y; | ||
| // triangle bbox; min & max are calculated like this for speed | ||
| var minTX = a.x < b.x ? (a.x < c.x ? a.x : c.x) : (b.x < c.x ? b.x : c.x), | ||
| minTY = a.y < b.y ? (a.y < c.y ? a.y : c.y) : (b.y < c.y ? b.y : c.y), | ||
| maxTX = a.x > b.x ? (a.x > c.x ? a.x : c.x) : (b.x > c.x ? b.x : c.x), | ||
| maxTY = a.y > b.y ? (a.y > c.y ? a.y : c.y) : (b.y > c.y ? b.y : c.y); | ||
| var x0 = ax < bx ? (ax < cx ? ax : cx) : (bx < cx ? bx : cx), | ||
| y0 = ay < by ? (ay < cy ? ay : cy) : (by < cy ? by : cy), | ||
| x1 = ax > bx ? (ax > cx ? ax : cx) : (bx > cx ? bx : cx), | ||
| y1 = ay > by ? (ay > cy ? ay : cy) : (by > cy ? by : cy); | ||
| // z-order range for the current triangle bbox; | ||
| var minZ = zOrder(minTX, minTY, minX, minY, invSize), | ||
| maxZ = zOrder(maxTX, maxTY, minX, minY, invSize); | ||
| var minZ = zOrder(x0, y0, minX, minY, invSize), | ||
| maxZ = zOrder(x1, y1, minX, minY, invSize); | ||
@@ -186,10 +196,8 @@ var p = ear.prevZ, | ||
| while (p && p.z >= minZ && n && n.z <= maxZ) { | ||
| if (p !== ear.prev && p !== ear.next && | ||
| pointInTriangle(a.x, a.y, b.x, b.y, c.x, c.y, p.x, p.y) && | ||
| area(p.prev, p, p.next) >= 0) return false; | ||
| if (p.x >= x0 && p.x <= x1 && p.y >= y0 && p.y <= y1 && p !== a && p !== c && | ||
| pointInTriangle(ax, ay, bx, by, cx, cy, p.x, p.y) && area(p.prev, p, p.next) >= 0) return false; | ||
| p = p.prevZ; | ||
| if (n !== ear.prev && n !== ear.next && | ||
| pointInTriangle(a.x, a.y, b.x, b.y, c.x, c.y, n.x, n.y) && | ||
| area(n.prev, n, n.next) >= 0) return false; | ||
| if (n.x >= x0 && n.x <= x1 && n.y >= y0 && n.y <= y1 && n !== a && n !== c && | ||
| pointInTriangle(ax, ay, bx, by, cx, cy, n.x, n.y) && area(n.prev, n, n.next) >= 0) return false; | ||
| n = n.nextZ; | ||
@@ -200,5 +208,4 @@ } | ||
| while (p && p.z >= minZ) { | ||
| if (p !== ear.prev && p !== ear.next && | ||
| pointInTriangle(a.x, a.y, b.x, b.y, c.x, c.y, p.x, p.y) && | ||
| area(p.prev, p, p.next) >= 0) return false; | ||
| if (p.x >= x0 && p.x <= x1 && p.y >= y0 && p.y <= y1 && p !== a && p !== c && | ||
| pointInTriangle(ax, ay, bx, by, cx, cy, p.x, p.y) && area(p.prev, p, p.next) >= 0) return false; | ||
| p = p.prevZ; | ||
@@ -209,5 +216,4 @@ } | ||
| while (n && n.z <= maxZ) { | ||
| if (n !== ear.prev && n !== ear.next && | ||
| pointInTriangle(a.x, a.y, b.x, b.y, c.x, c.y, n.x, n.y) && | ||
| area(n.prev, n, n.next) >= 0) return false; | ||
| if (n.x >= x0 && n.x <= x1 && n.y >= y0 && n.y <= y1 && n !== a && n !== c && | ||
| pointInTriangle(ax, ay, bx, by, cx, cy, n.x, n.y) && area(n.prev, n, n.next) >= 0) return false; | ||
| n = n.nextZ; | ||
@@ -228,5 +234,5 @@ } | ||
| triangles.push(a.i / dim); | ||
| triangles.push(p.i / dim); | ||
| triangles.push(b.i / dim); | ||
| triangles.push(a.i / dim | 0); | ||
| triangles.push(p.i / dim | 0); | ||
| triangles.push(b.i / dim | 0); | ||
@@ -261,4 +267,4 @@ // remove two nodes involved | ||
| // run earcut on each half | ||
| earcutLinked(a, triangles, dim, minX, minY, invSize); | ||
| earcutLinked(c, triangles, dim, minX, minY, invSize); | ||
| earcutLinked(a, triangles, dim, minX, minY, invSize, 0); | ||
| earcutLinked(c, triangles, dim, minX, minY, invSize, 0); | ||
| return; | ||
@@ -290,3 +296,2 @@ } | ||
| outerNode = eliminateHole(queue[i], outerNode); | ||
| outerNode = filterPoints(outerNode, outerNode.next); | ||
| } | ||
@@ -311,7 +316,4 @@ | ||
| // filter collinear points around the cuts | ||
| var filteredBridge = filterPoints(bridge, bridge.next); | ||
| filterPoints(bridgeReverse, bridgeReverse.next); | ||
| // Check if input node was removed by the filtering | ||
| return outerNode === bridge ? filteredBridge : outerNode; | ||
| return filterPoints(bridge, bridge.next); | ||
| } | ||
@@ -334,7 +336,4 @@ | ||
| qx = x; | ||
| if (x === hx) { | ||
| if (hy === p.y) return p; | ||
| if (hy === p.next.y) return p.next; | ||
| } | ||
| m = p.x < p.next.x ? p : p.next; | ||
| if (x === hx) return m; // hole touches outer segment; pick leftmost endpoint | ||
| } | ||
@@ -347,4 +346,2 @@ } | ||
| if (hx === qx) return m; // hole touches outer segment; pick leftmost endpoint | ||
| // look for points inside the triangle of hole point, segment intersection and endpoint; | ||
@@ -390,3 +387,3 @@ // if there are no points found, we have a valid connection; | ||
| do { | ||
| if (p.z === null) p.z = zOrder(p.x, p.y, minX, minY, invSize); | ||
| if (p.z === 0) p.z = zOrder(p.x, p.y, minX, minY, invSize); | ||
| p.prevZ = p.prev; | ||
@@ -459,4 +456,4 @@ p.nextZ = p.next; | ||
| // coords are transformed into non-negative 15-bit integer range | ||
| x = 32767 * (x - minX) * invSize; | ||
| y = 32767 * (y - minY) * invSize; | ||
| x = (x - minX) * invSize | 0; | ||
| y = (y - minY) * invSize | 0; | ||
@@ -490,5 +487,5 @@ x = (x | (x << 8)) & 0x00FF00FF; | ||
| function pointInTriangle(ax, ay, bx, by, cx, cy, px, py) { | ||
| return (cx - px) * (ay - py) - (ax - px) * (cy - py) >= 0 && | ||
| (ax - px) * (by - py) - (bx - px) * (ay - py) >= 0 && | ||
| (bx - px) * (cy - py) - (cx - px) * (by - py) >= 0; | ||
| return (cx - px) * (ay - py) >= (ax - px) * (cy - py) && | ||
| (ax - px) * (by - py) >= (bx - px) * (ay - py) && | ||
| (bx - px) * (cy - py) >= (cx - px) * (by - py); | ||
| } | ||
@@ -636,3 +633,3 @@ | ||
| // z-order curve value | ||
| this.z = null; | ||
| this.z = 0; | ||
@@ -639,0 +636,0 @@ // previous and next nodes in z-order |
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Improved metrics
- Total package byte prevSize
- increased by0.88%
95170
- Number of lines in readme file
- increased by3.64%
256
Worsened metrics
- Lines of code
- decreased by-0.4%
1250
No dependency changes