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Re: pong paddles are not going equally fast

by kcott (Archbishop)
on Jul 23, 2020 at 11:16 UTC ( [id://11119705]=note: print w/replies, xml ) Need Help??


in reply to pong paddles are not going equally fast

[Disclaimer: I am not a user of SDL and I do not have it installed. The following is untested guesswork (actually, perl -c says "syntax OK", but untested beyond that).]

After looking at your posted code, I had a similar thought to what ++bliako wrote.

I can see that you've copied the code from "[PDF] SDL::Manual": a visual inspection shows no problems there.

Try replacing this entire call:

$app->add_event_handler(sub { ... });

with

{ my %paddle_move; my $key_joiner; BEGIN { $key_joiner = '~'; %paddle_move = ( SDL_KEYDOWN . $key_joiner . SDLK_UP, -2, SDL_KEYDOWN . $key_joiner . SDLK_DOWN, 2, SDL_KEYUP . $key_joiner . SDLK_UP, 0, SDL_KEYUP . $key_joiner . SDLK_DOWN, 0, ); } $app->add_event_handler(sub { my $event = shift; my $paddle_key = $event->type . $key_joiner . $event->key_sym; if (exists $paddle_move{$paddle_key}) { $player1->{v_y} = $paddle_move{$paddle_key}; } }); }

That will set up all of the possible values for $player1->{v_y} once, at compile time. Assigning those values now only requires a single if condition, instead of the multiple if and elsif conditions you currently have.

— Ken

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