picture.cpp

在vc 6.0环境下的一个坦克小游戏

// Picture.cpp: implementation of the CPicture class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "tank.h"
#include "Picture.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

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

CPicture::CPicture()
{
	m_pPicture	= NULL;
}

CPicture::~CPicture()
{
	UnLoad();
}

bool CPicture::Load(CString sResourceType, CString sResource)
{
	bool bResult = false;

	if (m_pPicture != NULL)
		UnLoad();

	if (m_pPicture == NULL)
	{
		BYTE*	pBuff = NULL;
		int		nSize = 0;
		if (GetResource(sResource.GetBuffer(0), sResourceType.GetBuffer(0), pBuff, nSize))
		{
			if (nSize > 0)
			{
				pBuff = new BYTE[nSize];

				if (GetResource(sResource.GetBuffer(0), sResourceType.GetBuffer(0), pBuff, nSize))
				{
					if (LoadFromBuffer(pBuff, nSize))
						bResult = true;
				}

				delete [] pBuff;
			}
		}
	}
	return bResult;
}

bool CPicture::Load(CString sFileName)
{
	bool bResult = false;

	if (m_pPicture != NULL)
		UnLoad();

	if (m_pPicture == NULL)
	{
		CFile			cFile;
		CFileException	e;

		if (cFile.Open(sFileName, CFile::modeRead | CFile::typeBinary, &e))
		{
			BYTE* pBuff = new BYTE[cFile.GetLength()];

			if (cFile.Read(pBuff, cFile.GetLength()) > 0)
			{
				if (LoadFromBuffer(pBuff, cFile.GetLength()))
					bResult = true;
			}

			delete [] pBuff;
		}
	}
	return bResult;
}

void CPicture::UnLoad()
{
	if (m_pPicture != NULL)
	{
		m_pPicture->Release();
		m_pPicture = NULL;
	}
}

bool CPicture::Draw(CDC* pDC)
{
	if (m_pPicture != NULL)
	{
		long hmWidth;
		long hmHeight;
		m_pPicture->get_Width(&hmWidth);
		m_pPicture->get_Height(&hmHeight);

		int nWidth	= MulDiv(hmWidth,	pDC->GetDeviceCaps(LOGPIXELSX), HIMETRIC_INCH);
		int nHeight	= MulDiv(hmHeight,	pDC->GetDeviceCaps(LOGPIXELSY), HIMETRIC_INCH);
		
		return Draw(pDC, 0, 0, nWidth, nHeight);
	}
	return false;
}

bool CPicture::Draw(CDC* pDC, CPoint Pos)
{
	if (m_pPicture != NULL)
	{
		long hmWidth;
		long hmHeight;
		m_pPicture->get_Width(&hmWidth);
		m_pPicture->get_Height(&hmHeight);

		int nWidth	= MulDiv(hmWidth,	pDC->GetDeviceCaps(LOGPIXELSX), HIMETRIC_INCH);
		int nHeight	= MulDiv(hmHeight,	pDC->GetDeviceCaps(LOGPIXELSY), HIMETRIC_INCH);
		
		return Draw(pDC, Pos.x, Pos.y, nWidth, nHeight);
	}
	return false;
}

bool CPicture::Draw(CDC* pDC, CPoint Pos, CSize Size)
//在指定区域中绘制全图
{
	if (m_pPicture != NULL)
	{
		long hmWidth;
		long hmHeight;
		m_pPicture->get_Width(&hmWidth);
		m_pPicture->get_Height(&hmHeight);

		int nWidth	= Size.cx;
		int nHeight	= Size.cy;
		
		return Draw(pDC, Pos.x, Pos.y, nWidth, nHeight);
	}
	return false;
}

bool CPicture::Draw(CDC* pDC, double nSizeRatio)
//按一定比例压缩或扩大图片
{
	if (m_pPicture != NULL)
	{
		long hmWidth;
		long hmHeight;
		m_pPicture->get_Width(&hmWidth);
		m_pPicture->get_Height(&hmHeight);

		int nWidth	= int(MulDiv(hmWidth,	pDC->GetDeviceCaps(LOGPIXELSX), HIMETRIC_INCH) * nSizeRatio);
		int nHeight	= int(MulDiv(hmHeight,	pDC->GetDeviceCaps(LOGPIXELSY), HIMETRIC_INCH) * nSizeRatio);
		
		return Draw(pDC, 0, 0, nWidth, nHeight);
	}
	return false;
}

bool CPicture::Draw(CDC* pDC, CPoint Pos, double nSizeRatio)
//绘制图像中指定部分
{
	if(nSizeRatio>1.0)return false;
	if (m_pPicture != NULL)
	{
		long hmWidth;
		long hmHeight;
		m_pPicture->get_Width(&hmWidth);
		m_pPicture->get_Height(&hmHeight);

		hmWidth=(long)hmWidth*nSizeRatio;
		int nWidth	= int(MulDiv(hmWidth,	pDC->GetDeviceCaps(LOGPIXELSX), HIMETRIC_INCH));
		int nHeight	= int(MulDiv(hmHeight,	pDC->GetDeviceCaps(LOGPIXELSY), HIMETRIC_INCH));
		if (m_pPicture->Render(pDC->m_hDC, Pos.x, Pos.y, nWidth, nHeight, 0, hmHeight, hmWidth, -hmHeight, NULL) == S_OK)
		return TRUE;
	}
	return false;
}

bool CPicture::Draw(CDC* pDC, int x, int y, int cx, int cy)
{
	long hmWidth;
	long hmHeight;
	m_pPicture->get_Width(&hmWidth);
	m_pPicture->get_Height(&hmHeight);

	if (m_pPicture->Render(pDC->m_hDC, x, y, cx, cy, 0, hmHeight, hmWidth, -hmHeight, NULL) == S_OK)
		return true;

	return false;
}


bool CPicture::LoadFromBuffer(BYTE* pBuff, int nSize)
{
	bool bResult = false;

	HGLOBAL hGlobal = GlobalAlloc(GMEM_MOVEABLE, nSize);
	void* pData = GlobalLock(hGlobal);
	memcpy(pData, pBuff, nSize);
	GlobalUnlock(hGlobal);

	IStream* pStream = NULL;

	if (CreateStreamOnHGlobal(hGlobal, TRUE, &pStream) == S_OK)
	{
		HRESULT hr;
		if ((hr = OleLoadPicture(pStream, nSize, FALSE, IID_IPicture, (LPVOID *)&m_pPicture)) == S_OK)
			bResult = true;
	
		pStream->Release();
	}

	return bResult;
}

bool CPicture::GetResource(LPSTR lpName, LPSTR lpType, void* pResource, int& nBufSize)
{ 
	HRSRC		hResInfo;
	HANDLE		hRes;
	HMODULE		hInst	= NULL; 
	LPSTR		lpRes	= NULL; 
	int			nLen	= 0;
	bool		bResult	= FALSE;

	// Find the resource
	hResInfo = FindResource(hInst, lpName, lpType);

	if (hResInfo == NULL) 
		return false;

	// Load the resource
	hRes = LoadResource(hInst, hResInfo);

	if (hRes == NULL) 
		return false;

	// Lock the resource
	lpRes = (char*)LockResource(hRes);

	if (lpRes != NULL)
	{ 
		if (pResource == NULL)
		{
			nBufSize = SizeofResource(hInst, hResInfo);
			bResult = true;
		}
		else
		{
			if (nBufSize >= (int)SizeofResource(hInst, hResInfo))
			{
				memcpy(pResource, lpRes, nBufSize);
				bResult = true;
			}
		} 

		UnlockResource(hRes);  
	}

	// Free the resource
	FreeResource(hRes);

	return bResult;
}

CSize CPicture::GetSize(CDC* pDC)
{
	CSize rcResult = CSize(0,0);
	
	if (m_pPicture != NULL)
	{
		long hmWidth;
		long hmHeight;
		m_pPicture->get_Width(&hmWidth);
		m_pPicture->get_Height(&hmHeight);

		rcResult.cx	= MulDiv(hmWidth,	pDC->GetDeviceCaps(LOGPIXELSX), HIMETRIC_INCH);
		rcResult.cy	= MulDiv(hmHeight,	pDC->GetDeviceCaps(LOGPIXELSY), HIMETRIC_INCH);
	}
	return rcResult;
}

bool CPicture::Draw(CDC *pDC, CPoint pos, int x, int y, CSize size)
{
//绘制指定图中指定区域x,y分别标定于原点的距离
	if (m_pPicture != NULL)
	{
		long hmWidth;
		long hmHeight;
		m_pPicture->get_Width(&hmWidth);
		m_pPicture->get_Height(&hmHeight);

		int nWidth	= int(MulDiv(hmWidth,	pDC->GetDeviceCaps(LOGPIXELSX), HIMETRIC_INCH));
		int nHeight	= int(MulDiv(hmHeight,	pDC->GetDeviceCaps(LOGPIXELSY), HIMETRIC_INCH));
        long tempX=(long)hmWidth*(double(x)/double(nWidth));
		hmWidth=(long)hmWidth*(double(x+size.cx)/double(nWidth));
		long tempY=(long)hmHeight*(double(y)/double(nHeight));
		hmHeight=(long)hmHeight*(double(y+size.cy)/double(nHeight));

//		int w=int(MulDiv((hmWidth-tempX),pDC->GetDeviceCaps(LOGPIXELSX), HIMETRIC_INCH));
//		int h=int(MulDiv((hmHeight-tempY),pDC->GetDeviceCaps(LOGPIXELSY), HIMETRIC_INCH));
		if (m_pPicture->Render(pDC->m_hDC, pos.x, pos.y,size.cx,size.cy, tempX, tempY, hmWidth, -hmHeight, NULL) == S_OK)
		return TRUE;
	}
	return false;
}