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index.html
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<!DOCTYPE html>
<html>
<head>
<title>Delaunator, the fastest JavaScript library for Delaunay triangulation of 2D points</title>
<style>
body { margin: 0; text-align: center; font-family: sans-serif; }
canvas { border: 1px solid #ccc; position: relative; }
a, a:visited { color: #09f }
</style>
</head>
<body>
<h2><a href="https://github.com/mapbox/delaunator">delaunator</a> demo</h2>
<canvas id="canvas"></canvas>
<script>var module = {};</script>
<script src="index.js"></script>
<script>
var points = [[168, 180], [168, 178], [168, 179], [168, 181], [168, 183], [167, 183], [167, 184], [165, 184], [162, 186], [164, 188], [161, 188], [160, 191], [158, 193], [156, 193], [152, 195], [152, 198], [150, 198], [147, 198], [148, 205], [150, 210], [148, 210], [148, 208], [145, 206], [142, 206], [140, 206], [138, 206], [135, 206], [135, 209], [131, 209], [131, 211], [127, 211], [124, 210], [120, 207], [120, 204], [120, 202], [124, 201], [123, 201], [125, 198], [125, 194], [127, 194], [127, 191], [130, 191], [132, 189], [134, 189], [134, 186], [136, 184], [134, 182], [134, 179], [134, 176], [136, 174], [139, 174], [141, 177], [142, 176], [144, 176], [147, 178], [148, 176], [151, 178], [154, 178], [153, 175], [152, 174], [152, 170], [152, 168], [150, 166], [148, 166], [147, 165], [145, 162], [146, 160], [146, 157], [146, 155], [144, 155], [142, 152], [140, 150], [138, 150], [138, 148], [140, 145], [140, 142], [140, 138], [139, 138], [137, 138], [135, 138], [133, 135], [132, 132], [129, 132], [128, 132], [124, 132], [124, 130], [123, 130], [118, 126], [116, 124], [112, 122], [109, 122], [105, 122], [102, 124], [100, 124], [97, 124], [95, 126], [92, 127], [89, 127], [88, 130], [85, 132], [80, 134], [72, 134], [69, 134], [65, 138], [64, 138], [58, 137], [56, 133], [52, 133], [51, 133], [48, 133], [44, 133], [41, 131], [38, 130], [35, 130], [32, 127], [30, 127], [27, 127], [24, 127], [24, 126], [23, 124], [20, 122], [17, 122], [16, 118], [15, 116], [15, 110], [18, 108], [20, 102], [24, 97], [28, 102], [28, 98], [26, 97], [28, 94], [27, 85], [29, 79], [32, 76], [39, 70], [44, 66], [48, 65], [53, 61], [53, 58], [51, 54], [54, 54], [52, 48], [51, 43], [48, 42], [49, 38], [48, 34], [51, 30], [53, 33], [58, 30], [61, 30], [60, 27], [64, 26], [68, 24], [74, 24], [80, 24], [85, 26], [92, 26], [96, 29], [103, 32], [109, 33], [112, 37], [116, 37], [120, 37], [124, 35], [126, 35], [128, 38], [132, 38], [134, 41], [138, 38], [140, 36], [142, 40], [144, 43], [145, 41], [149, 41], [155, 41], [159, 41], [161, 46], [165, 46], [164, 42], [164, 39], [164, 34], [167, 30], [173, 24], [178, 24], [184, 24], [189, 26], [195, 21], [195, 20], [199, 20], [203, 20], [207, 17], [211, 17], [216, 17], [218, 16], [222, 22], [225, 27], [228, 31], [226, 34], [224, 34], [226, 39], [228, 43], [230, 46], [236, 46], [242, 46], [243, 50], [245, 50], [247, 54], [247, 56], [248, 60], [248, 65], [253, 66], [255, 64], [260, 64], [264, 67], [268, 71], [272, 66], [275, 66], [281, 61], [285, 66], [286, 70], [292, 74], [294, 74], [296, 74], [296, 71], [301, 74], [307, 74], [311, 78], [315, 74], [315, 77], [319, 77], [322, 82], [328, 82], [331, 81], [331, 84], [333, 86], [333, 90], [330, 95], [326, 98], [328, 99], [332, 98], [333, 101], [331, 104], [329, 104], [327, 106], [329, 111], [332, 116], [333, 119], [333, 122], [332, 126], [332, 130], [327, 130], [321, 130], [317, 130], [315, 134], [312, 134], [308, 138], [306, 138], [306, 144], [306, 149], [306, 152], [301, 152], [297, 154], [295, 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174], [182, 171], [178, 171], [173, 174], [169, 174], [169, 175], [169, 179], [167, 182], [164, 186], [160, 192], [155, 195], [152, 198], [150, 198], [148, 198], [148, 202], [151, 208], [148, 210], [146, 208], [144, 205], [140, 205], [137, 208], [132, 208], [132, 210], [127, 210], [124, 210], [120, 206], [120, 202], [123, 202], [124, 201], [124, 198], [128, 195], [131, 191], [133, 187], [135, 183], [130, 203], [129, 208], [123, 203], [129, 203], [129, 198], [133, 198], [136, 200], [142, 200], [143, 199], [143, 197], [137, 196], [136, 194], [133, 194], [136, 186], [136, 182], [141, 186], [144, 186], [150, 186], [150, 190], [155, 190], [159, 188], [156, 182], [151, 182], [144, 182], [164, 176], [161, 177], [157, 177], [166, 176], [168, 165], [175, 167], [180, 167], [188, 159], [195, 164], [195, 162], [187, 162], [178, 163], [173, 166], [168, 170], [156, 170], [157, 165], [164, 165], [164, 161], [170, 159], [167, 158], [159, 154], [149, 151], [145, 145], [145, 138], [152, 138], [152, 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[230, 223], [230, 213], [175, 32], [172, 32], [171, 38], [184, 30]];
console.time('delaunay');
var delaunay = new Delaunator(points);
console.timeEnd('delaunay');
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
var minX = Infinity;
var minY = Infinity;
var maxX = -Infinity;
var maxY = -Infinity;
for (var i = 0; i < points.length; i++) {
var x = points[i][0];
var y = points[i][1];
if (x < minX) minX = x;
if (y < minY) minY = y;
if (x > maxX) maxX = x;
if (y > maxY) maxY = y;
}
var padding = 5;
var w = 1024;
var h = (w - 2 * padding) * (maxY - minY) / (maxX - minX) + 2 * padding;
canvas.style.width = w + 'px';
canvas.style.height = h + 'px';
canvas.width = w;
canvas.height = h;
if (window.devicePixelRatio >= 2) {
canvas.width = w * 2;
canvas.height = h * 2;
ctx.scale(2, 2);
}
var ratio = (w - 2 * padding) / Math.max(maxX - minX, maxY - minY);
ctx.lineJoin = 'round';
ctx.lineCap = 'round';
var updated = true;
canvas.onmousemove = function (e) {
points.push([
(e.layerX - padding) / ratio + minX,
(e.layerY - padding) / ratio + minY
]);
console.time('delaunay');
delaunay = new Delaunator(points);
console.timeEnd('delaunay');
updated = true;
}
function getX(i) {
return padding + ratio * (points[i][0] - minX);
}
function getY(i) {
return padding + ratio * (points[i][1] - minY);
}
function frame() {
requestAnimationFrame(frame);
draw();
}
frame();
function draw() {
if (!updated) return;
updated = false;
ctx.clearRect(0, 0, w, h);
var triangles = delaunay.triangles;
var hull = delaunay.hull;
ctx.beginPath();
for (var i = 0; i < triangles.length; i += 3) {
var p0 = triangles[i];
var p1 = triangles[i + 1];
var p2 = triangles[i + 2];
ctx.moveTo(getX(p0), getY(p0));
ctx.lineTo(getX(p1), getY(p1));
ctx.lineTo(getX(p2), getY(p2));
ctx.closePath();
}
ctx.strokeStyle = 'rgba(0,200,0,1)';
ctx.lineWidth = 0.5;
ctx.stroke();
// ctx.fillStyle = 'rgba(255,255,0,0.1)';
// ctx.fill();
ctx.beginPath();
ctx.moveTo(getX(hull.i), getY(hull.i));
var e = hull;
do {
ctx.lineTo(getX(e.next.i), getY(e.next.i));
e = e.next;
} while (e !== hull);
ctx.lineWidth = 1;
ctx.strokeStyle = 'red';
ctx.stroke();
ctx.fillStyle = 'black';
ctx.beginPath();
for (var i = 0; i < points.length; i++) {
ctx.rect(getX(i) - 1.5, getY(i) - 1.5, 3, 3);
}
ctx.fill();
}
</script>
</body>
</html>