csurface.cpp

游戏的算法 碰撞检测 开发环境是VC 库DIRECTX8.1

// cSurface.cpp: implementation of the cSurface class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "cSurface.h"

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

cSurface::cSurface()
{
	m_pSurface = NULL;
	m_ColorKey = -1;
}

cSurface::cSurface(HINSTANCE hInst, UINT nResource, int nWidth, int nHeight, COLORREF dwColorKey)
{
	m_pSurface = NULL;
	m_ColorKey = -1;
	
	Create(nWidth, nHeight, dwColorKey);
	this->LoadBitmap(hInst, nResource);
}

cSurface::~cSurface()
{
	if(m_pSurface != NULL)
	{
		OutputDebugString("Surface Destroyed\n");
		m_pSurface->Release();
		m_pSurface = NULL;
	}
}

BOOL cSurface::LoadBitmap(HINSTANCE hInst, UINT nRes, int nX, int nY, int nWidth, int nHeight)
{
    HDC                     hdcImage;
    HDC                     hdc;
    BITMAP                  bm;
    DDSURFACEDESC2          ddsd;
    HRESULT                 hr;

	HBITMAP	hbm;

	hbm = (HBITMAP) LoadImage(hInst, MAKEINTRESOURCE(nRes), IMAGE_BITMAP, nWidth, nHeight, 0L);

    if (hbm == NULL || m_pSurface == NULL)
        return FALSE;

    //确保要重置曲面
    m_pSurface->Restore();

    //要把位图载入到memoryDC中
    hdcImage = CreateCompatibleDC(NULL);
    if (!hdcImage)
        return FALSE;

	//将位图载入到MemoryDC
    SelectObject(hdcImage, hbm);

    //从位图句柄得到位图结构
    GetObject(hbm, sizeof(bm), &bm);

	//获得位图宽度和高度
	if(nWidth == 0)
		nWidth = bm.bmWidth;
	
	if(nHeight == 0)
		nHeight = bm.bmHeight;
    
    //得到曲面大小信息
    ddsd.dwSize = sizeof(ddsd);
    ddsd.dwFlags = DDSD_HEIGHT | DDSD_WIDTH;
    m_pSurface->GetSurfaceDesc(&ddsd);

    if ((hr = m_pSurface->GetDC(&hdc)) == DD_OK)
    {
        StretchBlt(hdc, 0, 0, ddsd.dwWidth, ddsd.dwHeight, hdcImage, nX, nY,
                   nWidth, nHeight, SRCCOPY);
        m_pSurface->ReleaseDC(hdc);
    }
    DeleteDC(hdcImage);

	return TRUE;
}

BOOL cSurface::Create(int nWidth, int nHeight, COLORREF dwColorKey)
{
    DDSURFACEDESC2		ddsd;
	HRESULT				hRet;
    DDCOLORKEY          ddck;

	m_ColorKey = dwColorKey;

    ZeroMemory( &ddsd, sizeof( ddsd ) );

    ddsd.dwSize = sizeof( ddsd );
	ddsd.dwFlags = DDSD_CAPS | DDSD_WIDTH | DDSD_HEIGHT;
    ddsd.ddsCaps.dwCaps = DDSCAPS_OFFSCREENPLAIN |
						  DDSCAPS_SYSTEMMEMORY;
	
	ddsd.dwWidth  = nWidth;
    ddsd.dwHeight = nHeight;

	//根据ddsd对曲面描述，创建一个曲面m_pSurface。
    hRet = GetDirectDraw()->CreateSurface(&ddsd, &m_pSurface, NULL );
    if( hRet != DD_OK )
	{
		DXTRACE_MSG("DirectDraw Surface Creation Failed");
        return FALSE;
	}

	if((int)dwColorKey != -1)
	{
		ddck.dwColorSpaceLowValue = dwColorKey;
		ddck.dwColorSpaceHighValue = 0;
		//设置m_pSurface底色
		m_pSurface->SetColorKey(DDCKEY_SRCBLT, &ddck);
	}

	//设置曲面高度和宽度
	m_Width  = nWidth;
	m_Height = nHeight;

	return TRUE;
}

BOOL cSurface::Draw(LPDIRECTDRAWSURFACE7 lpDest, int iDestX, int iDestY, int iSrcX, int iSrcY, int nWidth, int nHeight)
{
	RECT	rcRect;

	if(nWidth == 0 && nHeight == 0)
	{
		nWidth = m_Width;
		nHeight = m_Height;
	}

	rcRect.left   = iSrcX;
	rcRect.top    = iSrcY;
	rcRect.right  = nWidth  + iSrcX;
	rcRect.bottom = nHeight + iSrcY;

	if((int)m_ColorKey < 0)
	{
		//非透明的彩色拷贝
		lpDest->BltFast(iDestX, iDestY, m_pSurface, &rcRect,  DDBLTFAST_NOCOLORKEY);
	}
	else
	{
		//透明的彩色拷贝
		lpDest->BltFast(iDestX, iDestY, m_pSurface, &rcRect,  DDBLTFAST_SRCCOLORKEY);
	}

	return TRUE;
}

void cSurface::Destroy()
{
	if(m_pSurface != NULL)
	{
		m_pSurface->Release();
		m_pSurface = NULL;
	}
}

UINT cSurface::Height()
{
	return m_Height;
}

UINT cSurface::Width()
{
	return m_Width;
}

LPDIRECTDRAWSURFACE7 cSurface::GetSurface()
{
	return m_pSurface;
}