SDL KeyDown and KeyHit functions
Author
Hi, I'm having problems creating the above functions to return true if a particular key has been pressed? These functions need to behave in the same manor as the functions in a popular game engine Blitbasic, so if someone writes:
if(KeyDown(SDLK_RIGHT))
playerY += 1;
and you could also have a game loop set to exit if a particular key was hit
while(!KeyHit(SDLK_ESCAPE))
// run app
This way you give the user the option to choose thier own keys for tasks :)
Thanks.
Author
Thanks for the reply, yes I have taken this avenue before but struggled to actually write the function using this method? I will take another look but it's not looking great so far.
A KeyDown() function might look like this (you could also add in array bounds checking if you like).
As for KeyHit(), is that to test if a key was pressed and then released? If so simply compare the current key state with the previous key state (if key_was_down and key_is_now_up then key_hit).
Edit: Don't forget, SDL_PumpEvents() to update the keyboard state etc.
bool KeyDown(int key){ Uint8 *KeyboardState = SDL_GetKeyState(0); return 1 == KeyboardState[key] ? true : false;}As for KeyHit(), is that to test if a key was pressed and then released? If so simply compare the current key state with the previous key state (if key_was_down and key_is_now_up then key_hit).
Edit: Don't forget, SDL_PumpEvents() to update the keyboard state etc.
Author
Thanks for that, it still returns true, this is the problem, it doesn't matter what method I do it always returns true :(
Author
Yeah I've got a listen function which is called in the loop, in here you could put keyState = SDL_GetKeyState(NULL);
if(keyState[SDK_ESCAPE]==1))
exit(0)
And this would work. So in here I have PumpEvents() does it need to be (NULL) or (0)? Or would that make no difference?
if(keyState[SDK_ESCAPE]==1))
exit(0)
And this would work. So in here I have PumpEvents() does it need to be (NULL) or (0)? Or would that make no difference?
Author
Got it going, thank InsaneBoarder, I had this in the main loop
then the function
Thanks again :)
doReciever(){ while(SDL_PollEvent(&event)) { switch(event.type){ case SDL_QUIT: exit(0); break; } }}then the function
KeyDown(int key){ Uint8 *KeyboardState = SDL_GetKeyState(0); return 1 == KeyboardState[key] ? true : false;}Thanks again :)
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