createCanvas(400, 400);

}

​

rectOn = false //starts as off

​

function draw() {

  background(220);

  if (rectOn == true)

    {

      //what happens when activated

      fill('red')

      rect(125,160,100,150)

    }

  else{

    //what happens when not activated

    fill('white')

    rect(125,160,100,150)

  }

​

  if(mouseX >= 125 && mouseX <= 125+100 &&

    mouseY >= 160 && mouseY <= 160+150 && mouseIsPressed)

  {

     rectOn = true //turn on

  }

​

  //reset -- press r

  if(keyCode == 82)

    {

      rectOn = false //turn off

      keyCode = 0

    }

}