コード例 #1
0
  public void paint(Graphics g) {
    // set up the double buffering to make the game animation nice and smooth
    Graphics2D twoDGraph = (Graphics2D) g;

    // take a snap shop of the current screen and same it as an image
    // that is the exact same width and height as the current screen
    if (back == null) back = (BufferedImage) (createImage(getWidth(), getHeight()));

    // create a graphics reference to the back ground image
    // we will draw all changes on the background image
    Graphics graphToBack = back.createGraphics();

    if (lives < 1) {
      ball.setXSpeed(0);
      ball.setYSpeed(0);
      paddle.setSpeed(0);
      graphToBack.drawString("GAME OVER", 387, 30);
    } else if (bricks.isEmpty()) {
      ball.setXSpeed(0);
      ball.setYSpeed(0);
      paddle.setSpeed(0);
      graphToBack.drawString("YOU WIN", 387, 30);
    }

    ball.moveAndDraw(graphToBack);
    paddle.draw(graphToBack);
    for (Block x : bricks) {
      x.draw(graphToBack);
    }
    graphToBack.setColor(Color.white);
    graphToBack.drawString(score + ":" + lives, 387, 15);

    if (ball.didCollide(left) || ball.didCollide(right)) {
      ball.setXSpeed(-ball.getXSpeed());
    }

    if (ball.didCollide(top)) {
      ball.setYSpeed(-ball.getYSpeed());
    }

    if (ball.didCollide(bottom)) {
      ball.draw(graphToBack, Color.white);
      ball.setXSpeed(2);
      ball.setYSpeed(2);
      ball.setX(400);
      ball.setY(500);
      lives--;
      ball.setYSpeed(-ball.getYSpeed());
    }

    // see if the ball hits the paddle
    if (ball.didCollide(paddle)) ball.setYSpeed(-ball.getYSpeed());

    // brick collision
    for (Block x : bricks) {
      if (x.didCollide(ball)) {
        score++;
        x.draw(graphToBack, Color.white);
        bricks.remove(x);
        if (ball.didCollideTop(x) || ball.didCollideBottom(x)) ball.setYSpeed(-ball.getYSpeed());
        else ball.setXSpeed(-ball.getXSpeed());
      }
    }
    // see if the paddles need to be moved
    graphToBack.setColor(Color.black);
    graphToBack.drawString(score + ":" + lives, 387, 15);

    if (keys[0]) paddle.moveLeftAndDraw(graphToBack);
    if (keys[1]) paddle.moveRightAndDraw(graphToBack);

    twoDGraph.drawImage(back, null, 0, 0);
  }