[vtkusers] About Memory Rendering

[Liu Jiquan]

Hi, VTK users,

    I want to draw something directly to "vtkWindow", for example, I want to draw a border around the "vtkWindow". So I code as following:
==========================================================
 CRect oRect;
 GetClientRect(oRect);
 this->SetupMemoryRendering( oRect.Width(),
        oRect.Height(),
        pDC->m_hAttribDC);

 vtkMFCRenderView::OnDraw(pDC);

 vtkWin32OpenGLRenderWindow *pRenderWindow = (vtkWin32OpenGLRenderWindow*)this->GetVTKWindow();
 CDC *pMemoryDC = CDC::FromHandle( pRenderWindow->GetMemoryDC() );
 CPen *pOldPen = NULL;
 CPen oFramePen( PS_SOLID, 1, FOCUS_COLOR_3D );
 pOldPen = pMemoryDC->SelectObject(&oFramePen);
 pMemoryDC->SelectStockObject(NULL_BRUSH);
 pMemoryDC->Rectangle(oRect);
 pMemoryDC->SelectObject(pOldPen);
 pDC->SetStretchBltMode(HALFTONE);
 pDC->StretchBlt( 0, 0, oRect.Width(), oRect.Height(), 
      CDC::FromHandle( pRenderWindow->GetMemoryDC() ),
      0, 0, oRect.Width(), oRect.Height(), SRCCOPY );

 this->ResumeScreenRendering();
============================================================
    The rendering result is no problem, but the rendering speed is decreased very much.
    Is there any other method to draw something into "vtkWindow" directly without using vtk actors?

Regards,
Denver
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.vtk.org/pipermail/vtkusers/attachments/20020716/e4690ac7/attachment.htm>