www.gusucode.com > VC++ 实现位图透明效果示例 > VC++ 实现位图透明效果示例/gusucode/TransparentPicView.cpp
//Download by http://www.NewXing.com // TransparentPicView.cpp : implementation of the CTransparentPicView class // #include "stdafx.h" #include "TransparentPic.h" #include "TransparentPicDoc.h" #include "TransparentPicView.h" #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif ///////////////////////////////////////////////////////////////////////////// // CTransparentPicView IMPLEMENT_DYNCREATE(CTransparentPicView, CView) BEGIN_MESSAGE_MAP(CTransparentPicView, CView) //{{AFX_MSG_MAP(CTransparentPicView) // NOTE - the ClassWizard will add and remove mapping macros here. // DO NOT EDIT what you see in these blocks of generated code! //}}AFX_MSG_MAP // Standard printing commands ON_COMMAND(ID_FILE_PRINT, CView::OnFilePrint) ON_COMMAND(ID_FILE_PRINT_DIRECT, CView::OnFilePrint) ON_COMMAND(ID_FILE_PRINT_PREVIEW, CView::OnFilePrintPreview) END_MESSAGE_MAP() ///////////////////////////////////////////////////////////////////////////// // CTransparentPicView construction/destruction CTransparentPicView::CTransparentPicView() { // TODO: add construction code here } CTransparentPicView::~CTransparentPicView() { } BOOL CTransparentPicView::PreCreateWindow(CREATESTRUCT& cs) { // TODO: Modify the Window class or styles here by modifying // the CREATESTRUCT cs return CView::PreCreateWindow(cs); } ///////////////////////////////////////////////////////////////////////////// // CTransparentPicView drawing void CTransparentPicView::OnDraw(CDC* pDC) { CTransparentPicDoc* pDoc = GetDocument(); ASSERT_VALID(pDoc); //画底层位图 CBitmap bmp; bmp.LoadBitmap(IDB_BITMAP1); BITMAP bm; bmp.GetBitmap(&bm); int nWidth=bm.bmWidth,nHeight=bm.bmHeight; CDC MemDC; MemDC.CreateCompatibleDC(pDC); CBitmap* pOldBmp = MemDC.SelectObject(&bmp); pDC->BitBlt(0,0,nWidth,nHeight,&MemDC,0,0,SRCCOPY); MemDC.SelectObject(pOldBmp); //画上层透明位图 DrawTransparent(pDC,0,0,RGB(0,0,0)); // TODO: add draw code for native data here } ///////////////////////////////////////////////////////////////////////////// // CTransparentPicView printing BOOL CTransparentPicView::OnPreparePrinting(CPrintInfo* pInfo) { // default preparation return DoPreparePrinting(pInfo); } void CTransparentPicView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/) { // TODO: add extra initialization before printing } void CTransparentPicView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/) { // TODO: add cleanup after printing } ///////////////////////////////////////////////////////////////////////////// // CTransparentPicView diagnostics #ifdef _DEBUG void CTransparentPicView::AssertValid() const { CView::AssertValid(); } void CTransparentPicView::Dump(CDumpContext& dc) const { CView::Dump(dc); } CTransparentPicDoc* CTransparentPicView::GetDocument() // non-debug version is inline { ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CTransparentPicDoc))); return (CTransparentPicDoc*)m_pDocument; } #endif //_DEBUG ///////////////////////////////////////////////////////////////////////////// // CTransparentPicView message handlers void CTransparentPicView::DrawTransparent(CDC *pDC, int x, int y, COLORREF crColour) { COLORREF crOldBack=pDC->SetBkColor(RGB(255,255,255)); COLORREF crOldText=pDC->SetTextColor(RGB(0,0,0)); CDC dcImage, dcMask; CBitmap bmp; bmp.LoadBitmap(IDB_BITMAP2); //IDB_BITMAP1是待显示位图的资源ID BITMAP bm;bmp.GetBitmap(&bm); int nWidth=bm.bmWidth,nHeight=bm.bmHeight; //为图像及mask各创建一个DC dcImage.CreateCompatibleDC(pDC); dcMask.CreateCompatibleDC(pDC); //把图像装入image DC CBitmap* pOldBitmapImage=dcImage.SelectObject(&bmp); //为“掩码”位图创建一个单色bitmap CBitmap bitmapMask; bitmapMask.CreateBitmap(nWidth, nHeight, 1, 1, NULL); //把mask位图装入mask DC CBitmap* pOldBitmapMask = dcMask.SelectObject(&bitmapMask); //用透明色创建“掩码”位图 dcImage.SetBkColor(crColour);//crColor是位图中的透明色 dcMask.BitBlt(0, 0, nWidth, nHeight, &dcImage, 0, 0, SRCCOPY);//分3步进行实际的绘制 pDC->BitBlt(x, y, nWidth, nHeight, &dcImage, 0, 0, SRCINVERT); pDC->BitBlt(x, y, nWidth, nHeight, &dcMask, 0, 0, SRCAND); pDC->BitBlt(x, y, nWidth, nHeight, &dcImage, 0, 0, SRCINVERT); //恢复原先设置 dcImage.SelectObject(pOldBitmapImage); dcMask.SelectObject(pOldBitmapMask); pDC->SetBkColor(crOldBack); pDC->SetTextColor(crOldText); }