hi guys,
ive just started work on a pac-man clone, and im doing a tile-based system.
ive never worked with this kind of stuff before, and as usual theres not
much help for people using SDL on gamedev (thank god for you guys!)
anyway, heres the problem: i have 32x32 tiles set up and the player himself
is a tile. right now im working on just setting up a background and the
player and having him walk around colliding with walls. well everything is
working good, except, for some WEIRD reason, when i press a directional key
(to move the player), he doesnt just move the amount of spaces he is
supposed to. its almost as if i press the key once and the computer presses
it 5 times for me. if im suposed to move 1 space to the left, i move 5, in
my case i have to move 32 spaces at a time, so when i press a key i pretty
much jump across the screen. i cant figure out WHY tho. im using the EXACT
code i used in my pong clone(NOT tile based), so i dont see what the problem
could be. i added an SDL_Delay(1000) after the player.xPos +=32 etc lines,
AND THIS WORKS! BUT, this is a crappy fix. whats going to happen when i have
enemies moving around the screen and stuff? cant have everything delaying
for a second each frame. another thing that works, is putting ALL of my
input code into a while ( SDL_PollEvent(&event) ), but if i do this, the
player cant hold down the keys.(and besides, i didnt have to do that in my
last game, why does it matter now?) i dont know WHY this is happening, but
could someone maybe help me? here the part of my code which takes input and
moves the player. im using a map array thats 19 by [25] (x) (for
800x600 screen using 32x32 tiles)
void Move_Pac()
{
Uint8* keys; //we start a pointer that points to the keys being pressed
SDL_Event event; //create an event holder
while ( SDL_PollEvent(&event) ) //looks for events
{
if ( event.type == SDL_QUIT ) { data.done = 1; } //if the user pressed
the X on the screeen quit
if ( event.type == SDL_KEYDOWN ) //if the user pressed a key then.....
{
if ( event.key.keysym.sym == SDLK_ESCAPE || event.key.keysym.sym ==
SDLK_q ) { data.done = 1; } //if they pressed escape or q then quit
}
}
//SDL_PumpEvents();
keys = SDL_GetKeyState(NULL);
//first we move the player then the enemy
if ( keys[SDLK_UP])
{
if (map[(player.yPos - 32)/32][player.xPos/32] == OPEN_SPACE)
player.yPos-=32;
}
if ( keys[SDLK_DOWN])
{
if (map[(player.yPos + 32)/32][player.xPos/32] == OPEN_SPACE)
player.yPos+=32;
}
if (keys[SDLK_LEFT])
{
if(map[player.yPos/32][(player.xPos - 32)/32] == OPEN_SPACE)
player.xPos-=32;
}
if (keys[SDLK_RIGHT])
{
if (map[player.yPos/32][(player.xPos + 32)/32] == OPEN_SPACE)
player.xPos+=32;
}
}
please note - if i put this entire function into the while (
SDL_PollEvent(&event) ), this problem will not happen. but if i do this, the
player cant hold down on the keys. they have to release a key and press it
again to move. i just dont understand why this is happening. also if i add
an SDL_Delay(1000), (at the end of each one of these if statements), this
also fixes it, but for some reason if i take out the delay, its as im
pressing the key 4 or 5 times instead of once. if you want more source to
look at (the whole “game” so far is only around 140 lines or so) please let
me know. i appreciate it. thank you everyone!!!_________________________________________________________________
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