RePaint Problem

This is a discussion on RePaint Problem within the Windows Programming forums, part of the Platform Specific Boards category; I have a program that is somewhat like ms Paint. And everytime its repainted w/e was drawn on it gets ...

  1. #1
    Registered User mrafcho001's Avatar
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    RePaint Problem

    I have a program that is somewhat like ms Paint.

    And everytime its repainted w/e was drawn on it gets deleted.
    I know why, thats not the case. I want to know how to keep whatever was drawn there, without it beind deleted everytime its resized or repained.

    Any suggestions how i could do that?

    Thanks

    EDIT:

    By the way im using Win32.
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  2. #2
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    Check out WM_ERASEBKGND.

    Kuphryn

  3. #3
    Registered User mrafcho001's Avatar
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    I dont get it.

    what do i do when i get the message?

    Im guessing that i would have to create a bush out of whats drawn on the screen and repaint with the brush? or what?
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    C++ Enthusiast jmd15's Avatar
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    Just a guess, but maybe when you receive that message make it do nothing and maybe it won't do it's default operation of clearing the background?
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  5. #5
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    How are you 'saving' what was currently on screen?

    Are you using double buffering?

    Need to draw to a Compatible DC and then BitBlt() that to the DC returned from BeginPaint() using the Rect in the paintstruct filled by BeginPaint()
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  6. #6
    Registered User mrafcho001's Avatar
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    Quote Originally Posted by novacain
    How are you 'saving' what was currently on screen?

    Are you using double buffering?

    Need to draw to a Compatible DC and then BitBlt() that to the DC returned from BeginPaint() using the Rect in the paintstruct filled by BeginPaint()
    NVM, i got it all

    I used a memory DC and HBITMAP to store everything i draw and then i move the bitmap from the Memory DC to the Screen DC, but i dont know how to draw the the bitmap to the screen.
    Last edited by mrafcho001; 09-05-2005 at 10:52 AM.
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  7. #7
    train spotter
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    >>but i dont know how to draw the the bitmap to the screen.

    In the WM_PAINT BitBlt() your screen DC to the DC returned (or in the PAINTSTRUCT) from BeginPaint().

    Use the rect in the PAINTSTRUCT for the area to draw to.
    "Man alone suffers so excruciatingly in the world that he was compelled to invent laughter."
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