createCanvas(600, 400);

  // background

  background(255, 255, 0);

}

​

function draw() {

​

​

  // ellipse

  noStroke();

  fill(0, 255, 255);

  ellipse(mouseX, mouseY, 50, 50);

​

  // rectangle

​

  //   fill(255,0,255);

  //   rect(mouseX,mouseY,50,50);

​

​

}

​

​

function mousePressed() {

  background(255, 255, 0);

}