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Lorenz Toy
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| license: gpl-3.0 |
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| <!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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