/* ***************************
Challenge 3: Motion
Designed By: Andy Grove
Creates a ball that starts in the middle of the canvas and
bounces off the edges of the canvas

What needs to be fixed to get this to work?
What changes could be made to make this code more professional?
****************************** */
int backgroundColor =255;
float BALLX=width/2;
float BALLY=height/2;
float ballXVelocity = random(1,10);
float ballYVelocity = random(1,10);
final int ball_color = 200;
float ball_size=80.0;

void setup() {
  size(1280, 800);
}

void draw() {
  background(backgroundColor);
  fill(ball_color);
  ellipse( BALLX, BALLY, ball_size, ball_size);
  //use velocity to simulate motion
  BALLX = BALLX + ballXVelocity;
  BALLY = BALLY+ ballYVelocity;
  //reverse direction when the ball hits the left/right edges of the canvas
  if (BALLX >= width - 40 || BALLX <= 0 + 40){
    ballXVelocity = ballXVelocity * (1);
    ballYVelocity = ballYVelocity * (-1);
  }
  //reverse direction when the ball hits the top/bottom edges of the canvas
  if (BALLY >= height - 40 || BALLY <= 0 + 40){
    ballXVelocity = ballXVelocity * (-1);
    ballYVelocity = ballYVelocity * (1);
  }
}