var ballX;

var ballY;



var speedX;

var speedY;



function setup() {

  createCanvas(500, 500);

  strokeWeight(10);



  ballX = 250;

  speedX = 5;

  

  ballY = 250;

  speedY = 10;

}



function draw() {

  background(208, 208, 208);



  ballX = ballX + speedX;

  ballY = ballY + speedY;



  if (ballX + 10 > 500) {

    speedX = -5;

  }



  if (ballX - 100 < 0) {

    speedX = 10;

  }

  

  if (ballY + 10 > 500) {

    speedY = -5;

  }

  

  if (ballY - 100 < 0) {

    speedY = 10;

  }



  noStroke();

  fill(0, 200, 205);

  ellipse(ballX, ballY, 100);

}