Clipping Regions and border

This is a discussion on Clipping Regions and border within the Windows Programming forums, part of the Platform Specific Boards category; {SOLVED: found another option SM_C(X/Y)(FIXED/SIZE)FRAME}Hi. I'm trying to create a Clock Application and I'm clipping my window in a circle. ...

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    ... arjunajay's Avatar
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    May 2005
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    Exclamation Clipping Regions and border

    {SOLVED: found another option SM_C(X/Y)(FIXED/SIZE)FRAME}Hi. I'm trying to create a Clock Application and I'm clipping my window in a circle. But somehow, 1 pixel row of the caption and pixel coloumn of the left border is NOT being clipped out. What am I doing wrong here?
    I obtained the caption height, border height & border width from GetSystemMetrics() (SM_CYCAPTION, SM_CYEDGE, SM_CXEDGE).
    But SM_C(X/Y)EDGE gives me a value of 2 while acually my border is 3 pixels wide (WS_EX_WINDOWEDGE style). This is why my caption and left border are showing.
    Is there some other SM_C(X/Y) value which will give me the correct border width?

    P.S. I tried substituting SM_C(X/Y)BORDER instead of EDGE. But It gives a value of 1 rather than 2 or 3 !

    P.S. Yes, this can be rectified by simply adding a '+1' to the values but then I would be hard coding the values which i'm trying to avoid.
    Heres' the simplified code strped to bare minimum(?):
    Code:
    #include<windows.h>
    #include"../clock/res.h"
    
    LRESULT CALLBACK MainProc(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam){
    
    switch(Msg){
    
        case WM_CREATE:
        {
            int border_width  = GetSystemMetrics(SM_CXEDGE),
                border_height = GetSystemMetrics(SM_CYEDGE),
                title_height  = GetSystemMetrics(SM_CYCAPTION);
    
            HRGN hRgn = CreateEllipticRgn(0, 0, 200, 200);
            OffsetRgn(hRgn, border_width, title_height + border_width);
    
            if( !hRgn )
                break;
    
            SetWindowRgn(hWnd, hRgn, TRUE);
            DeleteObject(hRgn);
    
        }
        break;
    
        case WM_DESTROY:
        {
            PostQuitMessage(0);
        }
        break;
    }
    return DefWindowProc(hWnd, Msg, wParam, lParam);
    }
    
    int WINAPI WinMain(
                       HINSTANCE hInst,
                       HINSTANCE hPrev,
                       LPSTR lpCmdLine,
                       int nCmdShow
                       )
    {
        WNDCLASSEX WndCls;
    
        WndCls.cbSize = sizeof(WNDCLASSEX);
        WndCls.style  = 0;
        WndCls.lpfnWndProc = MainProc;
        WndCls.cbClsExtra  = 0;
        WndCls.cbWndExtra  = 0;
        WndCls.hInstance   = hInst;
        WndCls.hIcon   = LoadIcon(hInst, MAKEINTRESOURCE(IDI_ICONSM));
        WndCls.hIconSm = LoadIcon(hInst, MAKEINTRESOURCE(IDI_ICONSM));
        WndCls.hCursor = LoadCursor(NULL, IDC_ARROW);
        WndCls.hbrBackground = HBRUSH( COLOR_DESKTOP + 1);
        WndCls.lpszMenuName  = NULL;
        WndCls.lpszClassName = "MainClass";
    
        if( !RegisterClassEx(&WndCls) ){
            MessageBox(NULL, "Error Registering Class", "Exiting...", MB_OK);
            return 1;
        }
    
        HWND hWnd = CreateWindowEx(WS_EX_WINDOWEDGE, "MainClass", "Clock",
                                   WS_SYSMENU | WS_MINIMIZEBOX,
                                   0, 0, //CW_USEDEFAULT, CW_USEDEFAULT,
                                   210, 250,
                                   NULL, NULL, hInst, NULL);
    
        if( !hWnd ){
            MessageBox(NULL, "Error Creating Window", "Exiting...", MB_OK);
            return 1;
        }
    
        ShowWindow(hWnd, SW_SHOW);
    
        MSG Msg;
    
        while( GetMessage(&Msg, NULL, 0, 0) > 0 ){
            TranslateMessage(&Msg);
            DispatchMessage(&Msg);
        }
    
        return 0;
    }
    The caption & border are seen as yellow below:
    Attachment 6711
    Last edited by arjunajay; 11-04-2006 at 10:13 AM.

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