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Pong: Improve AI paddle movement

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Begin and end triggers for AI paddle to start moving prevent it from
continually jerking around the ball's position. It still moves in steps
of paddle.speed though, but overall experience is smoother.
This commit is contained in:
Dmitrii Ubskii 2021-05-16 22:19:49 +03:00 committed by Linus Groh
parent 7c67c9b45f
commit bb76bcde57
Notes: sideshowbarker 2024-07-18 17:49:38 +09:00 
Author: https://github.com/dmitrii-ubskii
Commit: https://github.com/SerenityOS/serenity/commit/bb76bcde57f
Pull-request: https://github.com/SerenityOS/serenity/pull/7196
Reviewed-by: https://github.com/linusg
1 changed files with 24 additions and 10 deletions
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34
Userland/Games/Pong/Game.cpp
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@ -141,18 +141,32 @@ void Game::round_over(int winner)
void Game::calculate_move()
{
if ((m_ball.y() + m_ball.radius) < (m_player2_paddle.rect.y() + (m_player2_paddle.rect.height() / 2))) {
m_player2_paddle.moving_up = true;
m_player2_paddle.moving_down = false;
return;
int player_2_paddle_top = m_player2_paddle.rect.top();
int player_2_paddle_bottom = m_player2_paddle.rect.bottom();
int ball_position = m_ball.y() + m_ball.radius;
// AI paddle begins moving when the ball crosses the begin_trigger,
// but stops only if it crosses the end_trigger. end_trigger forces
// overcorrection, so that the paddle moves more smoothly.
int begin_trigger = m_player2_paddle.rect.height() / 4;
int end_trigger = m_player2_paddle.rect.height() / 2;
if (m_player2_paddle.moving_up) {
if (player_2_paddle_top + end_trigger < ball_position)
m_player2_paddle.moving_up = false;
} else {
if (player_2_paddle_top + begin_trigger > ball_position)
m_player2_paddle.moving_up = true;
}
if ((m_ball.y() + m_ball.radius) > (m_player2_paddle.rect.y() + (m_player2_paddle.rect.height() / 2))) {
m_player2_paddle.moving_up = false;
m_player2_paddle.moving_down = true;
return;
if (m_player2_paddle.moving_down) {
if (player_2_paddle_bottom - end_trigger > ball_position)
m_player2_paddle.moving_down = false;
} else {
if (player_2_paddle_bottom - begin_trigger < ball_position)
m_player2_paddle.moving_down = true;
}
m_player2_paddle.moving_up = false;
m_player2_paddle.moving_down = false;
}
void Game::tick()