createCanvas(windowWidth, windowHeight);

  background(255,255,255); 

  frameRate(20); 

} // end of the setup() function

​

function draw() { 

​

}

​

function mouseDragged() {

  stroke(0, 0, 100, 60);

  strokeWeight(2);

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

}

​

function keyPressed() {

  noStroke(); 

  fill(mouseX,0,0, mouseY);

  ellipse(mouseX, mouseY, 60, 20);

}

​

function doubleClicked() {

  save('my_drawing.png');

}