var x = 300;

var y = 250;

var changeX = 1;

var changeY = 0;

function setup() {

createCanvas(600, 500);

  background(0)

  stroke (255);

​

}

​

function draw() {

  background(0,0,0,5);

  rect (x,y,30,30);

}

 function keyIsDown() {

  if (key === 'd') {

    x = x + changeX;

  } else if (key === 'a') {

    x = x - changeX;

  }

   changeX = changeX + 0.75;

 }