VS2005 painter程序关键点

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在视图类中使用CClientDC绘图

CClientDC pDC = new CClientDC(this);pDC->MoveTo(...)pDC->LineTo(...)pDC->SelectStockObject(...)pDC->Rectangle(....)

改变鼠标外观

BOOL CPainterView::PreCreateWindow(CREATESTRUCT &cs){    cs.lpszClass = AfxRegisterWndClass(...);}

删除原来的图形

nOldMode = pDC->GetROP2();pDC->SetROP2(R2_NOT);通过使用像素反色重新绘制原来图形（删除）绘制新图形pDC->SetROP2(nOldMode);

CMetaFileDC与CMetaFile

CMetaFileDC用于将绘图内容保存到内存，以便之后的重绘操作。

重绘操作

/*获取MetaFile句柄，重绘*/HMETAFILE MetaFileHandle = pDoc->pMetaFileDC->Close();pDC->PlayMetaFile(MetaFileHandle);/*获取当前MetaFileDC*/CMetaFileDC *ReplacementMetaFile = new CMetaFileDC();ReplacementMetaFile->Create();ReplacementMetaFile->PlayMetaFile(MetaFileHandle);/*保存当前MetaFileDC*/DeleteMetaFile(MetaFileHandle);delete pDC->pMetaFileDC;pDC->pMetaFileDC = ReplacementMetaFile;

保存到文件

CopyMetaFile(MetaFileHandle,_T("painter.wmf"));

从文件获取

HMETAFILE MetaFileHandle  = GetMetaFile(_T("painter.wmf"));CMetaFileDC *ReplacementMetaFile = new CMetaFileDC();ReplacementMetaFile->Create();ReplacementMetaFile->PlayMetaFile(MetaFileHandle);DeleteMetaFile(MetaFileHandle);delete pDC->pMetaFileDC;pDC->pMetaFileDC = ReplacementMetaFile;Invalidate();