index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>body {padding: 0; margin: 0;}</style>
</head>
<body>
<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.5.5/p5.min.js"></script>
<script>
function Point() {
this.x = width / 2;
this.y = height / 2;
}
Point.prototype.copy = function() {
var point = new Point();
point.x = this.x;
point.y = this.y;
return point;
}
Point.prototype.step = function() {
var angle = random(-PI, PI);
this.x += cos(angle) * 1;
this.y += sin(angle) * 1;
}
Point.prototype.draw = function() {
ellipse(this.x, this.y, 2);
}
var points = [];
function restart() {
points = [];
for (var i = 0; i < 1; i++) {
points.push(new Point());
}
}
function setup() {
background(255);
createCanvas(windowWidth, windowHeight);
restart();
}
function windowResized() {
background(255);
resizeCanvas(windowWidth, windowHeight);
restart();
}
function draw() {
noStroke();
fill(0, 0, 0, 8);
for (var t = 0; t < 50; t++) {
for (var i = 0; i < points.length; i++) {
points[i].step();
points[i].draw();
}
if (points.length < 100 && random() < 0.001) {
points.push(points[Math.floor(random(points.length))].copy());
}
}
}
</script>
</body>
</html>