ball = {
	x: 100,
	y: 100,
	dx: -10,
	dy: 10,
	r : 80,
};

ball.update = function(){
  this.y += this.dy;
  this.x += ball.dx;
}

function setup() {
  // put setup code here
  createCanvas(400, 400);
  frameRate(30);

}

function draw() {
  // update code here
  ball.dy -= (ball.y - height/2)/20;
  ball.dx -= (ball.x - width/2)/20;
  ball.update();
  // put drawing code here
  background(220);
  stroke(0,0,255);
  strokeWeight(4);
  line(width/2, height/2, ball.x, ball.y);
  noStroke();
  ellipse(ball.x,ball.y,ball.r);
}