Dynamic Texture Creation/Generation

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Hi guys,
I created a texture protoype for a logistic software I currently work on, to visualize free and taken storage capacities of holding areas for a company in the neighbourhood.

The prototype looks something like this: Texture Prototype
The texture is then mapped on an object and assigned to a holding area.

So far so good, now to the actual problem!

The texture has to change its appearance depending on the holding area it is assigned to.
The features that have to change according to the holding area are:
- the Text (i.e. different name for different stored materials)
- the curved yellow bar on the left and the curved red bar on the right (depending on the amount of free and taken storage capacity the bar fill up the curved bars more or less and may also change their colors)

Now I don't really know how to approach this problem. It is obvious that I can't create textures for all fillstates of all the areas in advance and then just pick the respective one at runtime.

So my idea was to somehow generate these textures on runtime somehow or create some kind of template with exchangable parts.

Do you think that would be realisable? If yesm what would be your approach? Did you guys encounter some similar problem before or do you have any tipps or tricks how to approach this task best way? Maybe you know a library that can support me on this?

Right now I'm working with VS 2012 C++, OpenSG for Scene generation and OpenGL.

Thanks Guys in advance!

Posted 8-Jan-14 3:37am

gibson86

Updated 8-Jan-14 3:41am

v2

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enhzflep · Answer 1 · 2014-01-09T07:50:00

Yes, this is both possible and relatively easy. Whether or not I used GDI or GDI+ would depend on whether or not I wanted to support transparency/gradients - your image appears to show shadows generated by semi-opaque black lines, so gdi+ would be needed to duplicate it exactly.

Here's a little something to get you started. Its quite simple, just a series of circles, lines and arcs with a touch of text.

C++

HBITMAP zCreateDibSection(HDC hdc, int width, int height, int bitCount)
{
    BITMAPINFO bi;
    ZeroMemory(&bi, sizeof(bi));
    bi.bmiHeader.biSize = sizeof(bi.bmiHeader);
    bi.bmiHeader.biWidth = width;
    bi.bmiHeader.biHeight = height;
    bi.bmiHeader.biPlanes = 1;
    bi.bmiHeader.biBitCount = bitCount;
    bi.bmiHeader.biCompression = BI_RGB;
    return CreateDIBSection(hdc, &bi, DIB_RGB_COLORS, 0,0,0);
}

// should allow for size specification
// I've hardcoded it to 256x256 pixels
HBITMAP genTexture(wchar_t *text1, wchar_t *text2, COLORREF col1, COLORREF col2, int fillPercent1, int fillPercent2)
{
    HPEN origPen, thinBlack, thickBlack;
    HBRUSH origBrush, bkgBrush, col1Brush, col2Brush;
    HDC memDC;
    HBITMAP origBmp, result;
    RECT imgRect;
    RECT outerRc, innerRc;
    HFONT origFont, font;

    memDC = CreateCompatibleDC(0);
    origBmp = (HBITMAP) GetCurrentObject(memDC, OBJ_BITMAP);
    origPen = (HPEN) GetCurrentObject(memDC, OBJ_PEN);
    origBrush = (HBRUSH) GetCurrentObject(memDC, OBJ_BRUSH);
    origFont = (HFONT) GetCurrentObject(memDC, OBJ_FONT);

    result = zCreateDibSection(memDC, 256, 256, 24);
    SelectObject(memDC, result);

    SetRect(&innerRc, 256/4,256/4,256*3/4-1,256*3/4-1);
    SetRect(&outerRc, 0,0,255,255);

    bkgBrush = CreateSolidBrush( RGB(204,204,204) );
    FillRect(memDC, &outerRc, bkgBrush);

    thickBlack = CreatePen(PS_SOLID, 2, 0);
    SelectObject(memDC, thickBlack);
    SelectObject(memDC, GetStockObject(WHITE_BRUSH));
    Ellipse(memDC, outerRc.left,outerRc.top,outerRc.right,outerRc.bottom);

    BeginPath(memDC);
        col2Brush = CreateSolidBrush(col2);
        SelectObject(memDC, col2Brush);
        MoveToEx(memDC,128,128,NULL);


        AngleArc(memDC, 127,127,126,-90.0,(fillPercent2 / 100.0)*180.0);
        LineTo(memDC,128,128);
    EndPath(memDC);
    FillPath(memDC);


    BeginPath(memDC);
        col1Brush = CreateSolidBrush(col1);
        SelectObject(memDC, col1Brush);
        MoveToEx(memDC,128,128,NULL);
        AngleArc(memDC, 127,127,126,-90.0,-(fillPercent1 / 100.0)*180.0);
        LineTo(memDC,128,128);
    EndPath(memDC);
    FillPath(memDC);


    //  inner circle
    SelectObject(memDC, GetStockObject(WHITE_BRUSH));
    Ellipse(memDC, 64,64,(256*0.75)-1,(256*0.75)-1);

    MoveToEx(memDC, 66, 128, NULL);
    LineTo(memDC, 190,128);

    RECT textRectTop, textRectBottom;
    SetRect(&textRectTop, 64,64,192,128);
    SetRect(&textRectBottom, 64,128,192,192);

    font = CreateFont(-24, 0, 0, 0, 0, FALSE, FALSE, FALSE, 1, 0, 0, 0, 0, "Verdana");// ("Ms Shell Dlg"));
    SelectObject(memDC, font);
    DrawTextW(memDC, text1, -1, &textRectTop, DT_CENTER|DT_VCENTER|DT_SINGLELINE);
    DrawTextW(memDC, text2, -1, &textRectBottom, DT_CENTER|DT_VCENTER|DT_SINGLELINE);


    // clean-up
    SelectObject(memDC, origBrush);
    SelectObject(memDC, origPen);
    SelectObject(memDC, origBmp);
    SelectObject(memDC, origFont);


    DeleteObject(col1Brush);
    DeleteObject(col2Brush);
    DeleteObject(font);
    DeleteObject(thickBlack);
    DeleteObject(bkgBrush);

    DeleteDC(memDC);
    return result;
}

void onPaint(HWND hwnd, WPARAM wParam, LPARAM lParam)
{
    HBITMAP img = genTexture(L"Text 1",L"Text 2", RGB(255,192,0),RGB(192,80,77),  50,66);
    HDC hdc;
    PAINTSTRUCT ps;
    HBITMAP old;
    HDC memDC;

    memDC = CreateCompatibleDC(0);
    old = (HBITMAP)SelectObject(memDC, img);

    hdc = BeginPaint(hwnd, &ps);

    BitBlt(hdc, 0,0, 255,255, memDC, 0,0, SRCCOPY);

    EndPaint(hwnd, &ps);
    SelectObject(memDC, old);
    DeleteObject(img);
}


BOOL CALLBACK DlgMain(HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    switch(uMsg)
    {
    case WM_INITDIALOG:
    {
    }
    return TRUE;

    case WM_CLOSE:
    {
        EndDialog(hwndDlg, 0);
    }
    return TRUE;

    case WM_PAINT:
        onPaint(hwndDlg, wParam, lParam);
        return 0;

    case WM_COMMAND:
    {
        switch(LOWORD(wParam))
        {
        }
    }
    return TRUE;
    }
    return FALSE;
}