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an eternal plotted braid

master
Fr3deric 5 years ago
parent
commit
108a4af74c
  1. 65
      chaostest/braid.html
  2. 49
      chaostest/braid.js

65
chaostest/braid.html

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<!DOCTYPE html>
<title>Braid</title>
<code mode="text/html">
<html>
<head>
<meta charset="utf-8">
<style>
body {
background-color: #ffffcc;
}
</style>
<script type="text/javascript" src="paper.js"></script>
<script type="text/javascript" src="jsoneditor.min.js"></script>
<script type="text/javascript" src="braid.js" canvas="canvas"></script>
<script type="text/javascript">
var params;
function draw() {
paper.project.clear();
var grp = braid(params);
grp.translate(new Point(1.2, 1.2));
grp.scale(190, new Point(0,0));
}
function get_svg() {
return paper.project.exportSVG({asString: true});
}
window.onload = function() {
paper.install(window);
paper.setup(document.getElementById('canvas'));
var editor;
draw();
document.getElementById('download-svg').addEventListener('click', function() {
var svgdata = 'data:image/svg+xml;utf8,' + encodeURIComponent(get_svg());
var a = document.createElement('a');
a.download = 'export.svg';
a.href = svgdata;
document.body.appendChild(a);
a.click();
});
document.getElementById('new').addEventListener('click', function() {
draw();
});
}
</script>
</head>
<body>
<canvas id="canvas" style="width: 500px; height: 500px;" resize></canvas>
<hr>
<button id="download-svg">download svg</button>
<button id="new">new</button>
<br>
<div id="params"></div>
</body>
</html>

49
chaostest/braid.js

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function braid_get_rnd_params() {
return {
num_points: 10,
point_noise: 0.6,
num_connections: 8,
};
}
function braid(params) {
if(typeof params == 'undefined') {
var params = braid_get_rnd_params();
}
let points = [];
for(let i=0; i<params.num_points; i++) {
//const angle = i/params.num_points * 2 * Math.PI + Math.random() * params.point_noise;
const angle = i/params.num_points * 2 * Math.PI + Math.random() * params.point_noise;
const p1 = new Point(Math.sin(angle) + (Math.random() - 0.5) * params.point_noise, Math.cos(angle) + (Math.random() - 0.5) * params.point_noise);
const p2 = new Point(Math.sin(angle) + (Math.random() - 0.5) * params.point_noise, Math.cos(angle) + (Math.random() - 0.5) * params.point_noise);
points.push([p1, p2]);
}
var lines = [];
for(let i=0; i<params.num_points; i++) {
var l = new Path.Line(points[i][0], points[i][1]);
l.strokeColor = 'black';
l.strokeWidth = 5;
lines.push(l);
}
var connections = [];
for(let i=0; i<params.num_points; i++) {
var l1 = lines[i];
var l2 = lines[(i+1) % params.num_points];
for(let j=0; j<params.num_connections; j++) {
var o = j / (params.num_connections - 1);
var cl = new Path.Line(l1.getPointAt(o * l1.length), l2.getPointAt(o * l2.length));
cl.strokeColor = 'black';
connections.push(cl);
}
}
var grp = new paper.Group(lines);
grp.addChildren(connections);
return grp;
}
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