SketchBook

var rectX = [];
var rectY = [];
var rectWidth = [];
var rectHeight = [];

var colors = [];
var time;

function setup() {
createCanvas(windowWidth,
windowHeight);
angleMode(DEGREES);
rectMode(CENTER);

for (var i = 90; i > 0; i = i - 5) {
rectX[i] = windowWidth / 2;
rectY[i] = windowHeight / 2;
rectWidth[i] = i * (windowHeight / 90);
rectHeight[i] = windowHeight * sin(i);
}

colors.push(color(30,748,536,200));
colors.push(color(567,980,50,200));
colors.push(color(250,470,400,200));
colors.push(color(100,740,980,200));
colors.push(color(200,300,500,200));

time = 0;
}

function draw() {
background(200,250,300);
strokeWeight(50);
stroke(30,90,100,20);

for (var i = 90; i > 0; i = i - 5) {
var c = getColor(i / 90);
fill(c);
rect(rectX[i] + 30 * sin(3.0 * i + time), rectY[i], rectWidth[i], rectHeight[i]);
}

time = time + 1;
}

function getColor(t) {
t = constrain(t, 0.000, 0.9999);
var p = t * (colors.length - 1);
var from = floor(p);
return lerpColor(colors[from], colors[from + 1], p - from);
}