VC 透明位圖 實現透明位圖類

TransparentImage.h 文件

 

////////////////////////////////////////////////////////
#ifndef __TRANSPARENTIMAGE_H_TRANSPARENTIMAGE_42A6E395_97E4_11D3_B6F0_005004024A9E
#define __TRANSPARENTIMAGE_H_TRANSPARENTIMAGE_42A6E395_97E4_11D3_B6F0_005004024A9E
#if _MSC_VER >= 1000
#pragma once
#endif
class CTransparentImage : public CStatic
{
public:
 CTransparentImage();
 virtual ~CTransparentImage();
protected:
 //{{AFX_MSG( CTransparentImage)
 //afx_msg void OnPaint();
 //}}AFX_MSG
 DECLARE_MESSAGE_MAP()
protected:
 COLORREF m_maskColor;
 UINT m_nBitmapID;
 int m_nTop;
 int m_nLeft;
 CString m_strText;
public:
 afx_msg void OnPaint();
 void SetMaskColor(COLORREF maskColor);
 void SetBitmapID(UINT nID);
};
//{{AFX_INSERT_LOCATION}}
#endif

 

TransparentImage.cpp 文件

//////////////////////////////////////////////////////////////
#include "StdAfx.h"
#include "resource.h"
#include "TransparentImage.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__ ;
#endif

CTransparentImage::CTransparentImage()
{
 m_nBitmapID = 0;
 m_nTop = 0;
 m_nLeft = 0;
 m_maskColor = RGB(212,208,200);
}

CTransparentImage::~CTransparentImage()
{
}

BEGIN_MESSAGE_MAP(CTransparentImage, CStatic)
 //{{AFX_MSG_MAP( CTransparentImage )
 ON_WM_PAINT()
 //}}AFX_MSG_MAP
END_MESSAGE_MAP()

void CTransparentImage::OnPaint()
{
 CPaintDC pDC(this);
 CRect rect;
 GetClientRect(&rect);
 CBitmap FootballBMP;
 FootballBMP.LoadBitmap(m_nBitmapID);
 CDC ImageDC;
 ImageDC.CreateCompatibleDC(&pDC);
 CBitmap *pOldImageBMP = ImageDC.SelectObject(&FootballBMP);
 TransparentBlt(pDC.m_hDC, 0, 0, rect.Width(),rect.Height(), ImageDC.m_hDC, 0, 0, rect.Width(),rect.Height(),  m_maskColor);
 ImageDC.SelectObject(pOldImageBMP);
 FootballBMP.DeleteObject();
}

// 設置位圖資源
void CTransparentImage::SetBitmapID(UINT nID)
{
 m_nBitmapID = nID;
}

// 設置圖片背景所需顏色，從而實現圖片背景顏色和圖片外背景色一致

void CTransparentImage::SetMaskColor(COLORREF maskColor)
{
 m_maskColor = maskColor;
}