Curves drawn by randomly placing actors on the canvas, and walking them in a direction determined by the perlin noise function at their location. The continuity of the underlying noise function causes paths to converge together.
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<style> | |
body { | |
background: rgb(255, 255, 255); | |
} | |
</style> | |
<body> | |
<script src="http://d3js.org/d3.v3.min.js"></script> | |
<script src="/d2fn/raw/8777d620caef32959713/perlin.js"></script> | |
<script> | |
var width = 960, | |
height = 500, | |
noiseScale = 0.003, | |
actorStepLength = 1, | |
numActors = 10000, | |
step = 0, | |
steps = 150; | |
var canvas = d3.select("body") | |
.append("canvas") | |
.attr({width: width, height: height}); | |
var context = canvas.node().getContext("2d"); | |
context.fillStyle = "rgb(0, 0, 0)"; | |
context.fillRect(-1, -1, width, height); | |
var actors = []; | |
for(var i = 0; i < numActors; i++) { | |
actors.push(actor(width, height, noiseScale, actorStepLength)); | |
} | |
var opacity = easeInOut(steps); | |
d3.timer(function() { | |
if(++step > steps) { | |
console.log("done with animation"); | |
return true; | |
} | |
context.lineWidth = 1; | |
context.globalCompositeOperation = 'lighter'; | |
context.beginPath(); | |
for(var i in actors) { | |
var a = actors[i]; | |
var ln = a.step(); | |
var alpha = 0.6*opacity.get(); | |
context.strokeStyle = "rgba(49, 130, 189, " + alpha + ")"; | |
context.moveTo(ln.x1, ln.y1); | |
context.lineTo(ln.x2, ln.y2); | |
} | |
context.stroke(); | |
opacity.step(); | |
}); | |
function actor(width, height, noiseScale, stepLength) { | |
var x = Math.random() * width, | |
y = Math.random() * height; | |
var noise = perlin.noise(noiseScale); | |
return { | |
// get the last point and the next point | |
step: function() { | |
var t = noise(x, y) * Math.PI * 5; | |
var x1 = x, | |
y1 = y; | |
x = x + stepLength * Math.cos(t); | |
y = y + stepLength * Math.sin(t); | |
return { | |
x1: x1, | |
y1: y1, | |
x2: x, | |
y2: y | |
} | |
} | |
} | |
} | |
function easeInOut(steps) { | |
var n = 0; | |
var val = 0; | |
return { | |
step: | |
function() { | |
val = 0.5*(1-Math.cos(2 * Math.PI * (n++) / steps)); | |
}, | |
get: | |
function() { | |
return val; | |
} | |
}; | |
} | |
</script> |
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