​

function setup() {

  createCanvas(windowWidth, windowHeight);

  background(0);

  capture= createCapture();

  capture.hide();

  width=50;

}

​

function draw() {

  if(mouseIsPressed){

  var aspectRatio = capture.height/capture.width;

  var h= width*aspectRatio;

  image(capture,mouseX,mouseY,width,h);

  }

  if(keyIsPressed){

    if(key=='r'){

      background(0);

    }

    if (keyCode == UP_ARROW) {

      width++;

    }

    if (keyCode == DOWN_ARROW) {

      width--;

    }

  }

  noStroke();

  fill(237, 43, 255,50);

  rect(mouseX,mouseY,width,h);

}