createCanvas(400, 400);

}

​

function draw() {

  if (mouseIsPressed) {

    point(mouseX, mouseY);

  }

}

​

function keyPressed() {

  if (key == 's') {

    save("ex.png");

  }

  if (key == 'b') {

     background(random(255), random(255), random(255)); 

  }

  if (key == 'c') {

    stroke(random(255), random(255), random(255)); 

    line(0, 0, width, 0);

  }

}