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GDI 画图进阶

GDI 画图进阶. CMemDC. Memdc.h. Application to use CMemDC: 1. Add the file memdc.h in your project. 2. Add the line #include " memdc.h " to stdafx.h. 3. Add a windows message handler for WM_ERASEBKGND . BOOL CExampleView::OnEraseBkgnd(CDC* pDC) { //return CView::OnEraseBkgnd(pDC);

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GDI 画图进阶

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  1. GDI画图进阶

  2. CMemDC • Memdc.h

  3. Application to use CMemDC: • 1. Add the file memdc.h in your project. • 2. Add the line #include "memdc.h" to stdafx.h. • 3. Add a windows message handler for WM_ERASEBKGND. • BOOL CExampleView::OnEraseBkgnd(CDC* pDC) • { • //return CView::OnEraseBkgnd(pDC); • return FALSE; • } • 4. Change your OnDraw code to the following: • void CExampleView::OnDraw(CDC* dc) • { • CMemDC pDC(dc); • CExampleDoc* pDoc = GetDocument(); • ASSERT_VALID(pDoc); • // TODO: add draw code for native data here - use pDC • //as the device context to draw to • }

  4. 刷新窗口 • 发出消息WM_PAINT，激发OnPaint() and OnDraw() • Invalidate();

  5. GDIUtils.h and GDIUtils.cpp • 封装好的GDI画图类

  6. 定义CPen • Cpen pen( PS_SOLID, 2, RGB(0,0,255) ); • CGDISelectObject<CPen> tmpPen(pDC, &pen); • Or • Cpen pen(PS_NULL, 2, RGB(0,0,255) ); • CGDISelectObject<CPen> tmpPen(pDC, &pen);

  7. 定义CBrush • CBrush brush(RGB( 255,0,0 ) ); • CGDISelectObject<CBrush> tmpBrush(pDC, &brush); • Or • CBrush brush(HS_CROSS, RGB( 255,0,0 ) ); • CGDISelectObject<CBrush> tmpBrush(pDC, &brush); • Or • pDC->SelectStockObject( NULL_BRUSH );

  8. Dialog窗口

  9. CColorDialog • void CMiniDrawView::OnButtonFilledColor() • { • CColorDialog dlg; • if (dlg.DoModal() != IDOK) • return; • m_SelectedPolygons.SetFilledColor( dlg.GetColor() ); • Invalidate(); • }

  10. CFileDialog • void CMiniDrawView::OnButtonSaveToFile() • { • char szFilter[] = "WF Files (*.ply)|*.ply||"; • CFileDialog dlg(false,"ply","*.ply", • OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,szFilter,this); • if(dlg.DoModal()==IDOK) • { • m_SelectedPolygons.SaveToFile(dlg.GetFileName().GetBuffer(128)); • } • }

  11. 自定义Dialog • Cedit • …

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