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Breakout: Improve collision response between ball and paddle

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When the ball hits the side of the paddle, it would get stuck because
the paddle moves faster than the ball. This commit forces the post-
collision vertical velocity of the ball to be going up and makes sure
that new ball's y-position is higher than in the previous frame.
This commit is contained in:
Damien Firmenich 2021-09-10 16:59:33 +02:00 committed by Andreas Kling
parent d0245b5e6b
commit 61f573fa67
Notes: sideshowbarker 2024-07-18 04:19:32 +09:00 
Author: https://github.com/damienfir 🔰
Commit: https://github.com/SerenityOS/serenity/commit/61f573fa672
Pull-request: https://github.com/SerenityOS/serenity/pull/9938
Reviewed-by: https://github.com/AtkinsSJ ✅
1 changed files with 4 additions and 2 deletions
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6
Userland/Games/Breakout/Game.cpp
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@ -266,8 +266,10 @@ void Game::tick()
update(enclosing_int_rect(new_ball.rect()));
if (new_ball.rect().intersects(m_paddle.rect)) {
new_ball.position.set_y(m_ball.y());
new_ball.velocity.set_y(new_ball.velocity.y() * -1);
if (m_ball.y() < new_ball.y()) {
new_ball.position.set_y(m_ball.y());
}
new_ball.velocity.set_y(fabs(new_ball.velocity.y()) * -1);
float distance_to_middle_of_paddle = new_ball.x() - m_paddle.rect.center().x();
float relative_impact_point = distance_to_middle_of_paddle / m_paddle.rect.width();