Pong Art Pattern

let ballX, ballY, ballVelX, ballVelY, ballColor, prevColor;

let ballSize = 30;

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  ballX = random(windowWidth);

  ballY = random(windowHeight);

  ballVelX = random(1, 10);

  ballVelY = random(1, 10);

  ballColor = color(random(255), random(255), random(255));

  prevColor = color(100); 

}

​

function draw() {

  background(prevColor); 

  fill(ballColor);       

​

  ballX += ballVelX;

  ballY += ballVelY;

  ellipse(ballX, ballY, ballSize);

​

  if (ballX > windowWidth - ballSize / 2 || ballX < ballSize / 2) {

    ballVelX *= -1;

    prevColor = ballColor; 

    ballColor = color(random(255), random(255), random(255));

  }

  if (ballY > windowHeight - ballSize / 2 || ballY < ballSize / 2) { 

    ballVelY *= -1;

    prevColor = ballColor;

    ballColor = color(random(255), random(255), random(255));

  }

}

​

function mousePressed() {

 saveCanvas('pattern','png');

}