/** Reset ball to an initial state */
private void serveBall() {
mBall.x = getWidth() / 2;
mBall.y = getHeight() / 2;
mBall.speed = Ball.SPEED + mBallSpeedModifier;
mBall.randomAngle();
mBall.pause();
}
public BallsFrame() throws HeadlessException {
super("Funny balls");
setLayout(new BorderLayout());
executorService = Executors.newScheduledThreadPool(1);
ballsPanel =
new JPanel() {
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
if (blueBallVisible) {
g.setColor(Color.BLUE);
g.fillOval(blueBall.x, getHeight() / 2, BALL_DIAGONAL, BALL_DIAGONAL);
}
g.setColor(Color.RED);
g.fillOval(redBall.x, getHeight() / 2, BALL_DIAGONAL, BALL_DIAGONAL);
}
};
add(ballsPanel, BorderLayout.CENTER);
blueBallSwitch = new JCheckBox("Collision", true);
blueBallSwitch.addItemListener(
e -> {
if (blueBallVisible = blueBallSwitch.isSelected()) {
int x;
do x = random.nextInt(getWidth() - BALL_DIAGONAL);
while (redBall.x <= x && x <= redBall.rightX()
|| redBall.x <= x + BALL_DIAGONAL && x + BALL_DIAGONAL <= redBall.rightX());
blueBall.x = x;
}
});
add(blueBallSwitch, BorderLayout.SOUTH);
blueBallVisible = true;
moveToRight = true;
setSize(500, 500);
}
@Override
public void draw(Canvas c) {
inner_.dx = this.dx;
inner_.dy = this.dy;
inner_.x = this.x;
inner_.y = this.y;
super.draw(c);
inner_.draw(c);
}
private void startAnimation() {
redBall = new Ball(1);
blueBall = new Ball(getWidth() / 2);
executorService.scheduleAtFixedRate(
() -> {
if (redBall.rightX() >= getWidth()
|| redBall.x <= 0
|| blueBallVisible && redBall.intersectsWith(blueBall)) moveToRight = !moveToRight;
redBall.x += moveToRight ? 1 : -1;
ballsPanel.repaint();
},
1,
5,
TimeUnit.MILLISECONDS);
}
protected void handleBottomFastBounce(Paddle paddle, float px, float py) {
if (mBall.goingDown() == false) return;
float bx = mBall.x;
float by = mBall.y + Ball.RADIUS;
float pbx = px;
float pby = py + Ball.RADIUS;
float dyp = by - paddle.getTop();
float xc = bx + (bx - pbx) * dyp / (pby - by);
if (by > paddle.getTop()
&& pby < paddle.getTop()
&& xc > paddle.getLeft()
&& xc < paddle.getRight()) {
mBall.x = xc;
mBall.y = paddle.getTop() - Ball.RADIUS;
mBall.bouncePaddle(paddle);
playSound(mPaddleSFX);
increaseDifficulty();
}
}
protected void handleTopFastBounce(Paddle paddle, float px, float py) {
if (mBall.goingUp() == false) return;
float tx = mBall.x;
float ty = mBall.y - Ball.RADIUS;
float ptx = px;
float pty = py - Ball.RADIUS;
float dyp = ty - paddle.getBottom();
float xc = tx + (tx - ptx) * dyp / (ty - pty);
if (ty < paddle.getBottom()
&& pty > paddle.getBottom()
&& xc > paddle.getLeft()
&& xc < paddle.getRight()) {
mBall.x = xc;
mBall.y = paddle.getBottom() + Ball.RADIUS;
mBall.bouncePaddle(paddle);
playSound(mPaddleSFX);
increaseDifficulty();
}
}