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  4. What is difference between OnPaint and OnDraw?

What is difference between OnPaint and OnDraw?

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  • H Offline
    H Offline
    Hemant kulkarni
    wrote on last edited by
    #1

    Hi, I am developing a application in which I need to draw the some text and graphics on the view. I can do this in OnPaint as well as in OnDraw. But when one should use OnPaing and when OnDraw()? What is difference between OnPaint and OnDraw? Regards, Hemant Kulkarni.

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    • H Hemant kulkarni

      Hi, I am developing a application in which I need to draw the some text and graphics on the view. I can do this in OnPaint as well as in OnDraw. But when one should use OnPaing and when OnDraw()? What is difference between OnPaint and OnDraw? Regards, Hemant Kulkarni.

      C Offline
      C Offline
      CPallini
      wrote on last edited by
      #2

      OnDraw() is ultimately called by OnPaint(), as you can find inside MFC sources:

      void CView::OnPaint()
      {
      // standard paint routine
      CPaintDC dc(this);
      OnPrepareDC(&dc);
      OnDraw(&dc);
      }

      There you can also see what happens inside OnPrepare(). :)

      If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.

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      • H Hemant kulkarni

        Hi, I am developing a application in which I need to draw the some text and graphics on the view. I can do this in OnPaint as well as in OnDraw. But when one should use OnPaing and when OnDraw()? What is difference between OnPaint and OnDraw? Regards, Hemant Kulkarni.

        N Offline
        N Offline
        Nothend
        wrote on last edited by
        #3

        In the structure of MFC,OnPaint is the member function of Cwnd,OnDraw is the member function of CView Nothend

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        • H Hemant kulkarni

          Hi, I am developing a application in which I need to draw the some text and graphics on the view. I can do this in OnPaint as well as in OnDraw. But when one should use OnPaing and when OnDraw()? What is difference between OnPaint and OnDraw? Regards, Hemant Kulkarni.

          D Offline
          D Offline
          David Crow
          wrote on last edited by
          #4

          Hemant kulkarni wrote:

          What is difference between OnPaint and OnDraw?

          OnPaint() belongs to CWnd and handles the WM_PAINT message, while OnDraw() belongs to CView and is virtual.


          "Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

          "Judge not by the eye but by the heart." - Native American Proverb

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