bouncing ball

int xPos;

int yPos;

int velocityX;

int velocityY;

​

void setup() {

  size(500, 400);

  background(255, 100, 255);

  xPos = 100;

  yPos = 200;

  velocityX = 3;

  velocityY= 4;

}

​

void draw() {

  xPos += velocityX;

  yPos += velocityY;

  if (xPos > (width -25) || xPos < 25) {

    velocityX*=-1;

  }

  if (yPos > (height -25) || yPos < 25) {

    velocityY*=-1;

  }

  stroke(100, 50, 0, 63);

  strokeWeight(10);

  ellipse(xPos, yPos, 50, 50);

}

​

​