​

function setup() {

  createCanvas(400, 400);

  background(255, 0, 0);

}

​

function draw() {

  noStroke();

  circlecolor = color(0, mouseX, mouseY);

  print(circlecolor)

  fill(circlecolor);

  circle(mouseX, mouseY, 20);

}

​

function mousePressed(){

  background('blue');

}

​

​