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@mbostock
Last active Jun 29, 2016
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Lorenz System
license: gpl-3.0
<!DOCTYPE html>
<meta charset="utf-8">
<style>
body {
background: #000;
}
</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script>
var δτ = 0.003,
ρ = 28,
σ = 10,
β = 8 / 3,
x = .5,
y = .5,
z = 10,
n = 30;
var width = 960,
height = 500;
var canvas = d3.select("body").append("canvas")
.attr("width", width)
.attr("height", height);
var color = d3.scale.linear()
.domain([0, 20, 30, 50])
.range(["yellow", "orange", "brown", "purple"])
.interpolate(d3.interpolateHcl);
var context = canvas.node().getContext("2d");
context.lineWidth = .2;
context.fillStyle = "rgba(0,0,0,.03)";
d3.timer(function() {
context.save();
context.globalCompositeOperation = "lighter";
context.translate(width / 2, height / 2);
context.scale(12, 14);
context.rotate(30);
for (var i = 0; i < n; ++i) {
context.strokeStyle = color(z);
context.beginPath();
context.moveTo(x, y);
x += δτ * σ * (y - x);
y += δτ * (x * (ρ - z) - y);
z += δτ * (x * y - β * z);
context.lineTo(x, y);
context.stroke();
}
context.restore();
});
setInterval(function() {
context.fillRect(0, 0, width, height);
}, 100);
</script>
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