The paddle's movement is determined by the currently held keys. A key
is no longer considered held when a matching keyup_event() fires.
However, the event does not fire when the timer has stopped (e.g. due to
a game over condition), which can result in the paddle keeping its
former direction and moving on its own -- even after the player started
a new game. Therefore, any held keys will be cleared explicitly.
When the player runs into a game over condition, Game's timer is
stopped. In order for reset() to work properly, the timer has to be
started again. The condition is tracked via a new member variable,
`m_game_over`. To prevent confusion, game_over() has been renamed to
show_game_over_message().
When I play Pong, I don't really pay attention to whether my mouse is in
the Pong window. That means that sometimes, annoyingly, the window loses
my mouse, and I lose control of the paddle. Gasp! D:
This commit teaches Pong the wonders of global mouse tracking, thus
enabling the player to focus solely on the game.
- Make the ball chill out a bit by reducing its x velocity by 1.
- Make the AI dumber. It now relaxes until the ball is coming towards it
and is in its half of the court.
Just because you're the player, doesn't mean you can cheat ;)
- Limit paddle speed when following mouse cursor.
- Unhide pointer -- can't grab it, can't see when it's about to leave
the window otherwise.
- Add last pointer y position indication for the player paddle.
- Prevent the paddle from following the mouse when Up or Down is being
held (avoid controls fighting).
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.
SPDX License Identifiers are a more compact / standardized
way of representing file license information.
See: https://spdx.dev/resources/use/#identifiers
This was done with the `ambr` search and replace tool.
ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
