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[SDK Documentation] [Creating a complete game: Breakout]

 
Creating a complete game: Breakout

This document has been updated for use with GapiDraw 4.0 or later.
Last updated on October 6, 2008.

 

Step 9 : Random shine effects

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We will now make our game look a bit more interesting, and to do so we will add a special shine effect to the bricks. This is a small animation of 6 frames, and looks as follows:

Shine
The six frames making up our Shine animation.

We will make it so that at random intervals one of the bricks gets highlighted using the above animation. We will of course filter away the purple colors using a color key so that only the white "shine" remains.

First, download the file shine.png and save it to your Breakout\Common\res folder. Then add it to your Visual Studio project as a PNG image and name it IDB_BRICKSHINE.

Add the following code to myapplication.h:

class CMyApplication : public CGapiApplication
{
    ...
    CGapiSurface* m_pBrickShine;
    ...
}

Add the following code to myapplication.cpp:

CMyApplication::CMyApplication(const GDAPPCONFIG& config) : CGapiApplication(config)
{
    ...
    m_pBrickShine = new CGapiSurface(GetGlobal());
    ...
}
 
CMyApplication::~CMyApplication()
{
    ...
    delete m_pBrickShine;
    ...
}
 
HRESULT CMyApplication::CreateVidMemSurfaces(CGapiSurface* pBackBuffer, HINSTANCE hInstance)
{
    ...
    m_pBrickShine->CreateSurface(0, hInstance, IDB_BRICKSHINE, _T("PNG"));
    m_pBrickShine->SetColorKey(RGB(255, 0, 255));
    ...
}
 
HRESULT CMyApplication::GameDrawObjects(CGapiSurface* pBackBuffer)
{
    ...
    // Set brickshine
    DWORD dwUpdateInterval = (m_config.dwMaxFPS > 0) ? m_config.dwMaxFPS * 2 : 60;
    if ((DWORD)((float)rand()/(float)RAND_MAX*(float) dwUpdateInterval) == (m_config.dwMaxFPS >> 1))
    {
        DWORD dwBrickIndex = (DWORD)((float)rand()/(float)RAND_MAX*(float)(GAMEPARAM_NUMLINES * m_dwGameBricksPerLine));
        if (m_pBricks[dwBrickIndex].bShowBrick)
        {
            m_pBricks[dwBrickIndex].dwShineIndex = GAMEPARAM_NUMSHINE;
        }
    }
    
    // Draw brickshine
    for (dwY=0; dwY < GAMEPARAM_NUMLINES; dwY++)
    {
        for (dwX=0; dwX < m_dwGameBricksPerLine; dwX++)
        {
            DWORD dwBrickIndex = dwY * m_dwGameBricksPerLine + dwX;
            if (m_pBricks[dwBrickIndex].bShowBrick && (m_pBricks[dwBrickIndex].dwShineIndex > 0))
            {
                DWORD dwLeft = GAMEPARAM_BORDERWIDTH + dwBrickOffsetX + dwX * (GAMEPARAM_BRICKWIDTH + GAMEPARAM_BRICKSPACE);
                DWORD dwTop = GAMEPARAM_BRICKOFFSETY  + dwY * (GAMEPARAM_BRICKHEIGHT + GAMEPARAM_BRICKSPACE);
                DWORD dwXOffset = (GAMEPARAM_NUMSHINE - m_pBricks[dwBrickIndex].dwShineIndex) * GAMEPARAM_BRICKWIDTH;
                pBackBuffer->BltFast(dwLeft, dwTop, m_pBrickShine, CRect(dwXOffset, 0, dwXOffset+GAMEPARAM_BRICKWIDTH, GAMEPARAM_BRICKHEIGHT), GDBLTFAST_KEYSRC, NULL);
                m_pBricks[dwBrickIndex].dwShineIndex--;
            }
        }
    }
    return S_OK;
}

Shiny bricks done!

Let's move on to show some text!