​

function setup() {

  createCanvas(400, 400);

  background(200)

}

​

function mousePressed(){

   num += 30

  if (num > 255) num = 0

  fill(num, 255-num, num)

  triangle(mouseX, mouseY-10, mouseX-10, mouseY+10, mouseX+10, mouseY+10)

  fill(255-num, num, 255-num)

  rect(mouseX-5, mouseY-2, 10, 10)

}