Mapping Modes Example

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#include <windows.h>

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain(HINSTANCE hInstance,
                   HINSTANCE hPrevInstance,
                   LPSTR lpCmdLine,
                   int nCmdShow)
{
    const wchar_t CLASS_NAME[] = L"WindowClass";

    WNDCLASSEXW wc = {0};
    MSG msg;

    // Register the window class
    wc.cbSize = sizeof(WNDCLASSEXW);
    wc.lpfnWndProc = WndProc;
    wc.hInstance = hInstance;
    wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
    wc.hbrBackground = GetSysColorBrush(COLOR_WINDOW);
    wc.lpszClassName = CLASS_NAME;
    wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);

    if (!RegisterClassExW(&wc))
        return 0;

    HWND hwnd = CreateWindowExW(
        WS_EX_CLIENTEDGE,
        CLASS_NAME,
        L"Mapping Demo",
        WS_OVERLAPPEDWINDOW | WS_VISIBLE,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        680,
        290,
        NULL,
        NULL,
        hInstance,
        NULL);

    if (!hwnd)
        return 0;

    // Message loop
    while (GetMessage(&msg, NULL, 0, 0) > 0)
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return static_cast<int>(msg.wParam);
}

// Window procedure
LRESULT CALLBACK WndProc(HWND hwnd,
                         UINT msg,
                         WPARAM wParam,
                         LPARAM lParam)
{
    switch (msg)
    {
        case WM_PAINT:
        {
            PAINTSTRUCT ps;
            HDC dc = BeginPaint(hwnd, &ps);

            int savedDC = SaveDC(dc);

            // Create the pens
            HPEN redPen      = CreatePen(PS_SOLID, 1, RGB(255,0,0));
            HPEN bluePen     = CreatePen(PS_SOLID, 1, RGB(0,0,255));
            HPEN magentaPen  = CreatePen(PS_SOLID, 1, RGB(255,0,255));
            HPEN dashPen     = CreatePen(PS_DASH, 1, RGB(0,0,255));

            // Default rectangle (MM_TEXT)
            Rectangle(dc, 100, 100, 300, 300);

            // MM_HIMETRIC
            SelectObject(dc, redPen);
            SetMapMode(dc, MM_HIMETRIC);
            Rectangle(dc, 100, -100, 300, -300);

            // MM_LOMETRIC
            SelectObject(dc, bluePen);
            SetMapMode(dc, MM_LOMETRIC);
            Rectangle(dc, 100, -100, 300, -300);

            // MM_LOENGLISH
            SelectObject(dc, magentaPen);
            SetMapMode(dc, MM_LOENGLISH);
            Rectangle(dc, 100, -100, 300, -300);

            // MM_ANISOTROPIC
            SelectObject(dc, dashPen);

            SetMapMode(dc, MM_ANISOTROPIC);

            SetWindowExtEx(dc, 1, 10, NULL);
            SetViewportExtEx(dc, 1, 1, NULL);

            Rectangle(dc, 100, 300, 300, 500);

            // Restore original DC
            RestoreDC(dc, savedDC);

            // Delete created pens
            DeleteObject(redPen);
            DeleteObject(bluePen);
            DeleteObject(magentaPen);
            DeleteObject(dashPen);

            EndPaint(hwnd, &ps);
            return 0;
        }

        case WM_DESTROY:
            PostQuitMessage(0);
            return 0;
    }

    return DefWindowProcW(hwnd, msg, wParam, lParam);
}