SketchBook

var A = 1.4;
var B = 2.5;
var C = 1.4;
var D = -2.3;

var time;
var colors = [];

function setup() {
createCanvas(windowWidth,
windowHeight);
background(0,0,0);
noStroke();

colors.push(color(150, 180, 250, 128));
colors.push(color(200, 200, 250, 100));
colors.push(color(255, 160, 225, 10));
colors.push(color(255, 100, 105, 10));
colors.push(color(200, 25, 70, 10));
colors.push(color(95, 25, 55, 5));


time = 0;
}

function draw() {
translate(windowWidth / 2, windowHeight / 2);

var x = random(-3, 3);
var y = random(-3, 3);

for (var i = 0; i < 2000; i++) {
var xx = sin(A * y) - cos(B * x);
var yy = sin(C * x) - cos(D * y);
var c = getColor(time);
fill(c);
ellipse(xx * width * 0.25, yy * height * 0.25, 1);
x = xx;
y = yy;
}

time = time + 0.01;

if (time > 1.0) {
time = 0.0;
C += 0.1;
}
ellipse(6,11,3)
}

function getColor(t) {
var p = t * (colors.length - 1);
var from = floor(p);
return lerpColor(colors[from], colors[from + 1], p - from);
}