var py=300;

  var diameter = 50;

  var vx = 5;

  var vy = 2;

var score = 0;

​

function setup() {

  createCanvas(600, 600);

  var score = 0;

}

​

function draw() {

  background(100,100,255,50);

  strokeWeight(0);

  px = px + vx;

  py = py + vy;

  ellipse(px, py, 50, 50);

  var radius = diameter / 2;

  if (px > (width - radius)) {

    vx = 0-vx;

  }

  if (py > (height - radius)) {

    vy = 0-vy;

  }

  if (px < radius) {

    vx = 0-vx;

  }

  if (py < radius) {

    vy = 0-vy;

  }

​

  textSize(24);

  text("score: " + score, width/2-50, height/2);

  noStroke();

  fill(255);

  if (mouseY < 500){

  rect(560,mouseY, 30, 100);

  }

  else{

      rect(560,500, 30, 100);

  }

  if (((px +25 >= 560) && (py+25 >= mouseY))){

    vx = (vx + 0.5)*-1;

    vy = (vy +0.2)*-1;

    score = score + 1;

}

}