In-class example of if/else, mouse/key events, and functions.

Breakout.pde

// Yong Bakos
// Breakout!

boolean displayStartScreen = true;

final int BALL_SIZE = 20;
final int BALL_SPEED = 4;
int ballX;
int ballY;
int ballXDirection = 1;
int ballYDirection = 1;

final int PADDLE_HEIGHT = 20;
final int PADDLE_WIDTH = 100;
int paddleX;
int paddleY;

void setup() {
  size(400, 400);
  ballX = width * 0.25;
  ballY = height * 0.4;
  paddleX = width / 2;
  paddleY = height - 50;
}

void draw() {
  if (displayStartScreen) {
    background(100, 100, 100);
    textSize(50);
    textAlign(CENTER);
    text("BREAKOUT!", width / 2, height / 2);
    textSize(10);
    text("Click to begin.", width / 2, height / 2 + 100);
  } else {
    background(0);
    // Ball stuff
    ellipse(ballX, ballY, BALL_SIZE, BALL_SIZE);
    ballX = ballX + (ballXDirection * BALL_SPEED);
    ballY = ballY + (ballYDirection * BALL_SPEED);
    if (ballX >= width || ballX <= 0) {
      ballXDirection = ballXDirection * -1;
    }
    if (ballY >= height || ballY <= 0) {
      ballYDirection = ballYDirection * -1;
    }
    // Paddle stuff
    rectMode(CENTER);
    rect(paddleX, paddleY, PADDLE_WIDTH, PADDLE_HEIGHT);
    // TODO: move the paddle

    // TODO: handle bouncing

		// TODO: draw bricks
  }
}

void mousePressed() {
  displayStartScreen = false;
}