// The Ball class

class Ball {

  float x;
  float y;
  float r;
  float xspeed;
  float yspeed;
  float ballNumber;
  

  
  Ball(float theBallNumber) {
    ballNumber = theBallNumber;
    xspeed = random(-5,5);
    yspeed = random(-5,5);
    x = width/2;
    y = height/2;
    r = 10;
  }

  void go(float theBoxHeight) {
    render();
    update(theBoxHeight);
  }

  void render() {
    noStroke();
    fill(0,0,0);   // Set ellipse color
    ellipse(x,y,r,r);  // Draw ellipse
  }

  void  update(float theBoxHeight) {
      
    // Radius always decreases back to 10 if it's bigger
    if (r > 10) {
      r--;
    }
    
    // Adjust x,y based on speed
    x = x + xspeed;
    y = y + yspeed;
    
    // Account for bouncing off edges
    if ((x > width) || (x < 0)) {
      xspeed = xspeed * -1;
      r = 30; // Adjust radius when bouncing
    }
    
    if ((y > theBoxHeight) || (y < 0)) {
      yspeed = yspeed * -1;
      r = 30;
    }
  }

}