// ref: me-psychadelic

let x, y;

let r, g, b;

​

function setup() {

  createCanvas(600, 400);

  background(255);

}

​

function draw(a) {

​

  r = map(mouseY, 0, 400, 0, 400);

  b = map(mouseX, 0, 300, 150, 0);

 //background(0, b, r, 30);

  noStroke();

  fill(random(255), 0, random(255), random(100));

  circle(mouseX, r, b);

}

​

function mousePressed(){

  background(255);

}