createCanvas(500, 600);

  background(255);

  colorMode(HSB);

}

​

function draw() {

}

​

function mousePressed() {

  fill(mouseX, 255, 255);

  ellipse(mouseX - 50, mouseY, 50, 50); 

  ellipse(mouseX + 50, mouseY, 50, 50); 

  ellipse(mouseX, mouseY + 50, 50, 50); 

}

​

function keyTyped() {

 if(key == 'c'){

   background(255);

 }

}

​

/*

function mouseDragged() {

  if(mouseX < width / 2 && mouseY < height / 2) {

    fill(255, 0, 0);

  }

  if(mouseX > width / 2 && mouseY < height / 2) {

    fill(0, 0, 255);

  }

  if(mouseX < width / 2 && mouseY > height / 2) {

    fill(0, 255, 0); 

  }

  if(mouseX > width / 2 && mouseY > height / 2) {

    fill(255, 255, 0);

  }

  ellipse(mouseX, mouseY, 50, 50);

}

*/