var centerY;      // this is done outside of a

var speedX;       // function

var speedY;

​

function setup() {

  createCanvas(400, 400);

  centerX = 200;  // assigning its initial value,

  centerY = 200;  // in setup

  speedX = 5;

  speedY = 0;

}

​

function draw() {

  //background(255);

​

  // update the speed (gravity pulls it down)

  speedY = speedY + 0.1;

  // this conditional makes it change its

  // direction (= negative speed) when it

  // is hitting the floor

  if (centerY > 350) {

    speedY = speedY * -0.96;

  }  

​

  // update the position

  centerY = centerY + speedY;

  centerX = centerX + speedX;

​

  // this conditional makes it wrap around

  // the canvas

  if (centerX > 500) {

    centerX = -100;

  }

  ellipse(centerX, centerY, 100, 100);

}

​