flickering problem

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Started by raptorstrike September 19, 2004 07:37 PM

1 comment, last by sakky 19 years, 7 months ago

181

Author

September 19, 2004 07:37 PM

ok im trying to post the socre on the screen but its flickering so baddly i cant see it maybe i did my double buffering wrong or something because i dont thinks it should be this bad any way heres what i got BTW im using windows dev-c++


#include "breakout.h"
    

BOOL GameInitialize(HINSTANCE hInstance)
{
    _pGame = new GameEngine(hInstance , TEXT("breakout"), TEXT("breakout"), IDI_UFO, IDI_UFO_SM,500, 650);
        if (_pGame == NULL)
        {
            return FALSE;
        }; 
    _pGame->SetFrameRate(40);
    
        _hInstance =hInstance;
        return TRUE;
}
void GameStart(HWND hWindow)
{
    Offscreenbitmap = CreateCompatibleBitmap(GetDC(hWindow),_pGame->GetWidth(), _pGame->GetHeight());
    OffscreenDC = CreateCompatibleDC(GetDC(hWindow));
    RECT BlockBounds = { 0,0,_pGame->GetWidth(), _pGame->GetHeight()};
    for(int j = 0; j<30; j++)
    {
        blockbits[j] = new Bitmap(hDC, IDB_BLOCK , _hInstance);
    };    
    for(int i = 0; i<30; i++)
    {
        blocks = new Sprite(blockbits , BlockBounds , SA_NONE);
        _pGame->AddSprite(blocks);    
    };
    for (int l = 0; l <30; l++)
    { 
        blocks[l]->SetPosition(rand()%500, rand()%450);
        for(int s=0; s < 30; s++)
          if( blocks[l]->TestCollision(blocks) == <span class="cpp-keyword">TRUE</span>)
          {
              <span class="cpp-keyword">if</span> (blocks != blocks[l])
               blocks[l]-&gt;SetPosition(rand()%<span class="cpp-number">500</span>, rand()%<span class="cpp-number">450</span>);
          };    
                      
    };    
        
    RECT BallBounds =  { <span class="cpp-number">0</span> , <span class="cpp-number">0</span> , _pGame-&gt;GetWidth() , _pGame-&gt;GetHeight()};
    RECT PaddleBounds = { <span class="cpp-number">0</span> , <span class="cpp-number">0</span> , _pGame-&gt;GetWidth() , _pGame-&gt;GetHeight()};
    srand(GetTickCount());
    HDC hDC = GetDC(hWindow);
    BackGround = <span class="cpp-keyword">new</span> Bitmap(hDC, IDB_BACKGROUND , _hInstance);
    ballbit = <span class="cpp-keyword">new</span> Bitmap(hDC , IDB_BALL , _hInstance);
    paddlebit = <span class="cpp-keyword">new</span> Bitmap(hDC , IDB_PADDLE , _hInstance);
    ball = <span class="cpp-keyword">new</span> Sprite( ballbit , BallBounds , BA_BOUNCE);
    paddle = <span class="cpp-keyword">new</span> Sprite (paddlebit , PaddleBounds , BA_WRAP);
    ball-&gt;SetVelocity(<span class="cpp-number">0</span>,<span class="cpp-number">5</span>);
    paddle-&gt;SetVelocity(PaddleSpeed,<span class="cpp-number">0</span>);
    paddle-&gt;SetPosition(<span class="cpp-number">250</span>,<span class="cpp-number">600</span>);
    _pGame-&gt;AddSprite(ball);
    _pGame-&gt;AddSprite(paddle);
    
}  
<span class="cpp-keyword">void</span> GameEnd()
{
    _pGame-&gt;CleanupSprites();
    <span class="cpp-comment">//_pGame-&gt;CloseMIDIPlayer();</span>
    <span class="cpp-keyword">delete</span> _pGame;
}
<span class="cpp-keyword">void</span> GameActivate (HWND hWindow)
{
    
}   
<span class="cpp-keyword">void</span> GameDeactivate  (HWND hWindow)
{
    
}  
<span class="cpp-keyword">void</span> GamePaint( HDC hDC)
{
    TCHAR szText[<span class="cpp-number">64</span>];
    RECT rect = { <span class="cpp-number">237</span>, <span class="cpp-number">360</span>, <span class="cpp-number">301</span> };
    wsprintf(szText, <span class="cpp-literal">"%d"</span>, score);
    DrawText(hDC, szText, -<span class="cpp-number">1</span>, &amp;rect, DT_SINGLELINE | DT_CENTER | DT_VCENTER);
    BackGround-&gt;Draw(hDC, <span class="cpp-number">0</span> , <span class="cpp-number">0</span> , <span class="cpp-keyword">TRUE</span>);
    _pGame-&gt;DrawSprites(hDC);
}
<span class="cpp-keyword">void</span> GameCycle ()
{
     DrawText(hDC, szText, -<span class="cpp-number">1</span>, &amp;rect, DT_SINGLELINE | DT_CENTER | DT_VCENTER);
    _pGame-&gt;UpdateSprites();
    <span class="cpp-comment">//ball-&gt;Update();</span>
    <span class="cpp-comment">//paddle-&gt;Update();</span>
    InvalidateRect(_pGame-&gt;GetWindow(), NULL, <span class="cpp-keyword">FALSE</span>);
    HWND hWIndow =_pGame-&gt;GetWindow();
    HDC hDC = GetDC(hWindow);
    GamePaint(OffscreenDC);
    BitBlt(hDC, <span class="cpp-number">0</span>, <span class="cpp-number">0</span>, _pGame-&gt;GetWidth(), _pGame-&gt; GetHeight(), OffscreenDC, <span class="cpp-number">0</span>, <span class="cpp-number">0</span>, SRCCOPY);
    ReleaseDC(hWindow, hDC);
    <span class="cpp-keyword">if</span>(PaddleSpeed != <span class="cpp-number">0</span> &amp;&amp; PaddleSpeed &lt; <span class="cpp-number">0</span>)
    PaddleSpeed++;
    <span class="cpp-keyword">if</span>(PaddleSpeed != <span class="cpp-number">0</span> &amp;&amp; PaddleSpeed &gt; <span class="cpp-number">0</span>)
    PaddleSpeed–;
    paddle-&gt;SetVelocity(PaddleSpeed,<span class="cpp-number">0</span>);
}
<span class="cpp-keyword">void</span> HandleKeys()
{
    <span class="cpp-keyword">if</span>(GetAsyncKeyState(VK_LEFT) &lt; <span class="cpp-number">0</span>)
    {
        PaddleSpeed = -<span class="cpp-number">7</span>;
        paddle-&gt;SetVelocity(PaddleSpeed, <span class="cpp-number">0</span>);
    };  
    <span class="cpp-keyword">if</span>(GetAsyncKeyState(VK_RIGHT) &lt; <span class="cpp-number">0</span>)
    {
        PaddleSpeed = <span class="cpp-number">7</span>;
        paddle-&gt;SetVelocity(PaddleSpeed, <span class="cpp-number">0</span>);
    };      
    
}
<span class="cpp-keyword">void</span> MouseButtonDown(<span class="cpp-keyword">int</span> x, <span class="cpp-keyword">int</span> y, <span class="cpp-keyword">BOOL</span> bLeft)
{}
<span class="cpp-keyword">void</span> MouseButtonUp(<span class="cpp-keyword">int</span> x, <span class="cpp-keyword">int</span> y, <span class="cpp-keyword">BOOL</span> bLeft)
{}
<span class="cpp-keyword">void</span> MouseMove(<span class="cpp-keyword">int</span> x, <span class="cpp-keyword">int</span> y)
{} 
<span class="cpp-keyword">BOOL</span> SpriteCollision(Sprite* pSpriteHitter, Sprite* pSpriteHittee)
{
  <span class="cpp-keyword">if</span>(pSpriteHitter-&gt;GetBitmap() == ballbit &amp;&amp; pSpriteHittee-&gt;GetBitmap() == paddlebit)
  {
      <span class="cpp-keyword">if</span>(PaddleSpeed != <span class="cpp-number">0</span>)
      ball-&gt;SetVelocity(-PaddleSpeed,-<span class="cpp-number">5</span>);
      <span class="cpp-keyword">else</span> ball-&gt;SetVelocity(<span class="cpp-number">0</span>,-<span class="cpp-number">5</span>); 
  }
  <span class="cpp-keyword">for</span>(<span class="cpp-keyword">int</span> i = <span class="cpp-number">0</span>; i &lt; <span class="cpp-number">30</span>; i++)
  {
      <span class="cpp-keyword">if</span>(pSpriteHitter-&gt;GetBitmap() == ballbit &amp;&amp; pSpriteHittee-&gt;GetBitmap() == blockbits<span style="font-weight:bold;"> &amp;&amp; pSpriteHittee-&gt;IsHidden() != <span class="cpp-keyword">TRUE</span>)
      {
      
           ball-&gt;SetVelocity(<span class="cpp-number">0</span>,<span class="cpp-number">5</span>);
           pSpriteHittee-&gt;SetHidden(<span class="cpp-keyword">TRUE</span>);
      };    
  }; 
  <span class="cpp-keyword">return</span> <span class="cpp-keyword">false</span>;

}              


</pre></div><!–ENDSCRIPT–>

____________________________"This just in, 9 out of 10 americans agree that 1 out of 10 americans will disagree with the other 9"- Colin Mochrie

flounder

100

September 19, 2004 09:10 PM

i'm using that same engine as you (can't remember the name of the book it came with, though it was blue book). anyways i get that flickering problem too, i think its because of the windows api, though i really have no idea

agogsoft

sakky

100

September 19, 2004 09:34 PM

You are calling InvalidateRect after you draw the text. That may be your problem. Try calling before you draw any thing and see if that helps

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