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MemDC.h
资源名称:Exam7_4.rar [点击查看]
上传用户:tonybian
上传日期:2007-01-18
资源大小:328k
文件大小:3k
源码类别:
图形图象
开发平台:
WINDOWS
- #if !defined(AFX_CMemDC_H__F666A491_3847_11D3_A58E_00805FC1DE10__INCLUDED_)
- #define AFX_CMemDC_H__F666A491_3847_11D3_A58E_00805FC1DE10__INCLUDED_
- class CMemDC : public CDC {
- private:
- CBitmap m_bitmap; // Offscreen bitmap
- CBitmap* m_oldBitmap; // bitmap originally found in CMemDC
- CDC* m_pDC; // Saves CDC passed in constructor
- CRect m_rect; // Rectangle of drawing area.
- BOOL m_bMemDC; // TRUE if CDC really is a Memory DC.
- public:
- /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// Function Header
- CMemDC(CDC* pDC, CRect rect = CRect(0,0,0,0)) : CDC(), m_oldBitmap(NULL), m_pDC(pDC)
- //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
- {
- ASSERT(m_pDC != NULL); // If you asserted here, you passed in a NULL CDC.
- m_bMemDC = !pDC->IsPrinting();
- if (m_bMemDC){
- // Create a Memory DC
- CreateCompatibleDC(pDC);
- if ( rect == CRect(0,0,0,0) )
- pDC->GetClipBox(&m_rect);
- else
- m_rect = rect;
- m_bitmap.CreateCompatibleBitmap(pDC, m_rect.Width(), m_rect.Height());
- m_oldBitmap = SelectObject(&m_bitmap);
- SetWindowOrg(m_rect.left, m_rect.top);
- } else {
- // Make a copy of the relevent parts of the current DC for printing
- m_bPrinting = pDC->m_bPrinting;
- m_hDC = pDC->m_hDC;
- m_hAttribDC = pDC->m_hAttribDC;
- }
- }
- /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// Function Header
- ~CMemDC()
- //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
- {
- if (m_bMemDC) {
- // Copy the offscreen bitmap onto the screen.
- m_pDC->BitBlt(m_rect.left, m_rect.top, m_rect.Width(), m_rect.Height(),
- this, m_rect.left, m_rect.top, SRCCOPY);
- //Swap back the original bitmap.
- SelectObject(m_oldBitmap);
- } else {
- // All we need to do is replace the DC with an illegal value,
- // this keeps us from accidently deleting the handles associated with
- // the CDC that was passed to the constructor.
- m_hDC = m_hAttribDC = NULL;
- }
- }
- // Allow usage as a pointer
- CMemDC* operator->() {return this;}
- // Allow usage as a pointer
- operator CMemDC*() {return this;}
- };
- #endif
- // End CMemDC
- //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////