Having awful trouble getting background color of window to white

This is a discussion on Having awful trouble getting background color of window to white within the Windows Programming forums, part of the Platform Specific Boards category; Hello I am trying to get my program to have a white window, however when I include the following it ...

  1. #1
    Shadow12345
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    Having awful trouble getting background color of window to white

    Hello I am trying to get my program to have a white window, however when I include the following it still doesn't work (shows up black)

    wc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);

    and i am not sure what I am doing wrong

    also I have an opengl viewport in my program, I don't know if that is what is messing it up, or if I have supplied enough information for anyone to be able to actually help me at all.

  2. #2
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    Try using this in place of your GetStockObject call...

    Code:
    (HBRUSH)(COLOR_WINDOW + 1);
    Edit: Well GetStockObject( WHITE_BRUSH ) should work just as good. Maybe its OpenGL specific like when you fill or clear the back buffer. I haven't done a ton of OpenGL ( only Direct3D ).
    Last edited by MrWizard; 12-13-2002 at 10:09 PM.

  3. #3
    Guest Sebastiani's Avatar
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    Sometimes you have to force the brush, ie: call PatBlt() explicitly.

    Try this:

    HBRUSH brush = (HBRUSH)GetStckObject(WHITE_BRUSH);
    HBRUSH old = (HBRUSH)SelectObject(hdc, brush);
    RECT rc; GetClientRect(hwnd, &rc);
    PatBlt(hdc, 0, 0, rc.right-rc.left, rc.bottom-rc.top, PATCOPY);
    SelectObject(hdc, old);
    InvalidateRect(hwnd, &rc, TRUE);

    Or maybe even GL is overwriting yours. That would make things more complicated unless you are using your own paint handler....
    Code:
    #include <cmath>
    #include <complex>
    bool flip(bool value)
    {
           return std::pow
        (
            std::complex<float>(std::exp(1.0)), 
            std::complex<float>(0, 1) * std::complex<float>(std::atan(1.0)*(1 << (value + 2)))
        ).real() < 0;
    }

  4. #4
    erstwhile
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    >>an opengl viewport<<

    I think you need to change the gl colour; look for glClearColor and set its colour to white eg:
    Code:
    glClearColor(1.0f,1.0f,1.0f,0.5f);
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  5. #5
    Shadow12345
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    I think you need to change the gl colour; look for glClearColor and set its colour to white eg:
    the point is being able to have the gl color buffer hold any value without worrying about it changing the color of the window.

    here is a picture of the problem, i will then try sebastiani's suggestion
    Attached Images Attached Images  

  6. #6
    Guest Sebastiani's Avatar
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    Yes but the value of the gl color buffer controls the brush fill, so why not use Kens suggestion to change it. Seems simpler than my solution anyway.
    Code:
    #include <cmath>
    #include <complex>
    bool flip(bool value)
    {
           return std::pow
        (
            std::complex<float>(std::exp(1.0)), 
            std::complex<float>(0, 1) * std::complex<float>(std::atan(1.0)*(1 << (value + 2)))
        ).real() < 0;
    }

  7. #7
    Shadow12345
    Guest
    Yes but the value of the gl color buffer controls the brush fill, so why not use Kens suggestion to change it. Seems simpler than my solution anyway.
    I dont exactly know what you mean, I have a feeling the reverse is true also. Whatever color I choose for the glcolor buffer using glClearColor ends up being the color for not only the background in my opengl rendering viewport, but also the background color of the Window as well. I set the glviewport color to green, the window is green, I set the viewport color to black, the window is black. That is my problem.

  8. #8
    Emotionally Unstable DarkViper's Avatar
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    Code:
    WndClass.hbrBackground = (HBRUSH) (COLOR_WINDOW+1);
    that makes it white by default, but how do you make the default window background color to something like red?
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  9. #9
    Shadow12345
    Guest
    that makes it white by default, but how do you make the default window background color to something like red?
    By looking here:
    Here

  10. #10
    Registered User
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    WndClass.hbrBackground = (HBRUSH) (COLOR_WINDOW+1);--------------------------------------------------------------------------------


    that makes it white by default, but how do you make the default window background color to something like red?

    Use the CreateSolidBrush API and to create a COLORREF use the RGB macro Red would be RGB(255, 0, 0);
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  11. #11
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    WM_PAINT

    SetClassLong(hwnd, GCL_HBRBACKGROUND, (LONG)CreateSolidBrush(RGB(255, 255, 255)));

    is it what u wanted?

  12. #12
    Unregistered Leeman_s's Avatar
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    btw i'd suggest using windows media player vs. winamp. just a personal opinion heh.

  13. #13
    Emotionally Unstable DarkViper's Avatar
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    hey cool! that would work! sweet!

    and btw, i used WinAmp, or kazaa, whichever is most available
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