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@mbostock
Last active Mar 17, 2018
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Lorenz Toy
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,
x0 = .5,
y0 = .5,
z0 = 10;
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, 45])
.range(["yellow", "orange", "brown", "purple"])
.interpolate(d3.interpolateHcl);
var context = canvas.node().getContext("2d");
context.globalCompositeOperation = "lighter";
context.translate(width / 2, height / 2);
context.scale(12, 8);
context.lineWidth = .25;
d3.select("canvas").on("mousemove", function() {
var m = d3.mouse(canvas.node());
x0 = (m[0] - width / 2) / 12;
y0 = (m[1] - height / 2) / 8;
z0 = 10;
});
d3.timer(function() {
var x = x0 + (Math.random() - .5) * 4,
y = y0 + (Math.random() - .5) * 4,
z = z0 + (Math.random() - .5) * 4,
n = Math.random() * 30 | 0,
t1 = Math.random() * 500;
d3.timer(function(t0) {
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();
}
return t0 > t1;
});
context.save();
context.setTransform(1, 0, 0, 1, 0, 0);
context.globalCompositeOperation = "source-atop";
context.fillStyle = "rgba(0,0,0,.03)";
context.fillRect(0, 0, width, height);
context.restore();
});
</script>
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