While thing

This is a discussion on While thing within the C++ Programming forums, part of the General Programming Boards category; > while (right == true) Like has been said already. If right is false, if never gets into the loop. ...

  1. #16
    and the hat of wrongness Salem's Avatar
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    > while (right == true)
    Like has been said already.

    If right is false, if never gets into the loop.
    If right is true, it never gets out of the loop.

    Roughly speaking (5 mins reading the manual), I would try
    - SDL_AddTimer to set a timer.
    - In the timer callback function, call SDL_PushEvent to send a 'user' event, which in this context will mean that time has elapsed.

    Replace the while (right == true) with if (right == true)
    You'll now be getting periodic stimulus of the event queue (through the timer).
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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  2. #17
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    I'm not good at english. I don't really understand what you're saying. Show me some code.
    EDIT:
    What manual?
    Last edited by Livijn; 05-09-2007 at 03:45 PM.

  3. #18
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    This is hard

  4. #19
    Deathray Engineer MacGyver's Avatar
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    Quote Originally Posted by Livijn View Post
    But i want the game to work.
    Everybody wants their stuff to work.

    So why should you succeed in getting it to work? You need to put the effort into it. Playing around with tests is fine if you know what you're doing, but you have to be willing to invest in reading up on the library you're using.

  5. #20
    and the hat of wrongness Salem's Avatar
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    > What manual?
    The one from http://www.libsdl.org/docs.php
    I mean, c'mon - this isn't rocket science.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  6. #21
    Deathray Engineer MacGyver's Avatar
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    Quote Originally Posted by Salem View Post
    I mean, c'mon - this isn't rocket science.
    That would be ironic if his game involves spaceships.

  7. #22
    Frequently Quite Prolix dwks's Avatar
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    You know, if you say the title of this thread quickly it sounds sort of like this. </offtopic>
    dwk

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  8. #23
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    Lol, now it works when i'm moving the mouse. So if i hold down left button without moving the mouse, the piece goes 1 way to the left. If i move the mouse all the time the piece moves exactly like i want it to do without moving the mouse.

  9. #24
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    Understand?

  10. #25
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    Please don't bump threads to get them moved up on the list. If someone has some help to offer, they'll post. Until then, keep working on the problem yourself.

  11. #26
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    Okey! But i am working on it. I've been for the whole day. Only breaks for food and fresh air, which is together something like 2h.

  12. #27
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    >> Okey! But i am working on it. I've been for the whole day.
    Just keep at it. One piece at a time. Break it down as much as you can to narrow down the problem. Good luck.

  13. #28
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    I almsot got it now! When i move the mouse and hold down left or right, it moves! I think it is because the mouse gives the program a new event. Right? So if i would like to do this without moving the mouse. How should i do?

    Code:
    Code:
        //While the user hasn't quit
        while( quit == false )
        {  
            //If there's an event to handle
            while (SDL_PollEvent(&event))
            {
                  if (event.type == SDL_KEYDOWN)
                  {
                                    switch(event.key.keysym.sym)
                                    {
                                                                   case SDLK_LEFT:
                                                                         left = true;
                                                                         break;
                                                                         
                                                                   case SDLK_RIGHT:
                                                                         right = true;
                                                                         break;
                                                                         
                                                                   case SDLK_ESCAPE:
                                                                        quit = true;
                                                                        break;
                   }                 }
                   
                   if (event.type == SDL_KEYUP)
                   {
                                     switch(event.key.keysym.sym)
                                     {
                                                                    case SDLK_LEFT:
                                                                          left = false;
                                                                          SDL_FillRect( screen, NULL, NULL ); 
                                                                          apply_surface( 0, 0, background, screen );
                                                                          piece = load_image( "piece.png" ); 
                                                                          apply_surface( x, y, piece, screen ); 
                                                                          break;
                                                                    
                                                                    case SDLK_RIGHT:
                                                                         right = false;
                                                                         SDL_FillRect( screen, NULL, NULL ); 
                                                                         apply_surface( 0, 0, background, screen );
                                                                         piece = load_image( "piece.png" ); 
                                                                         apply_surface( x, y, piece, screen ); 
                                                                         break;
                                     }
                   }      
                //Check if the right is pressed
                if (right == true)
                {
                             x = x + 1; 
                             SDL_FillRect( screen, NULL, NULL ); 
                             apply_surface( 0, 0, background, screen );
                             piece = load_image( "piece-right.png" ); 
                             apply_surface( x, y, piece, screen ); 
                }
                
                //Check if the left is pressed
                if (left == true)
                {
                             x = x - 1; 
                             SDL_FillRect( screen, NULL, NULL ); 
                             apply_surface( 0, 0, background, screen );
                             piece = load_image( "piece-left.png" ); 
                             apply_surface( x, y, piece, screen ); 
                }
                
                //Apply the square
                apply_surface( 400, 150, square, screen );
                
                }    
                //If the user has Xed out the window
                if( event.type == SDL_QUIT )
                {
                    //Quit the program
                    quit = true;
                }
        
            //Update the screen
            if( SDL_Flip( screen ) == -1 )
            {
                return 1;    
            }
        }
    Last edited by Livijn; 05-10-2007 at 02:42 PM.

  14. #29
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    Bump

  15. #30
    Cat without Hat CornedBee's Avatar
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    Put the if(right == true) (by the way, why don't you simply use if(right) ?) outside the while(SDL_PollEvent...)
    All the buzzt!
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