var CircleX=0;

var CircleY=0;

var ColorR = 0;

​

function setup() {

  createCanvas(1024, 768);

    background(0, 0, 0);

}

​

function draw() {

    fill(0,0,0)

    strokeWeight(2);

    stroke(ColorR, ColorR, 255);

    ellipse(CircleX, CircleY, CircleSize, CircleSize);

    CircleSize = CircleSize + 1;

    CircleX = CircleX + PI;

    CircleY = CircleY + 1;

    ColorR = ColorR +5;

}