SFML/examples/win32/Win32.cpp

////////////////////////////////////////////////////////////
// Headers
////////////////////////////////////////////////////////////
#include <SFML/Graphics.hpp>
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>

#include <cmath>

HWND button;


////////////////////////////////////////////////////////////
/// Function called whenever one of our windows receives a message
///
////////////////////////////////////////////////////////////
LRESULT CALLBACK onEvent(HWND handle, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)
    {
        // Quit when we close the main window
        case WM_CLOSE:
        {
            PostQuitMessage(0);
            return 0;
        }

        // Quit when we click the "quit" button
        case WM_COMMAND:
        {
            if (reinterpret_cast<HWND>(lParam) == button)
            {
                PostQuitMessage(0);
                return 0;
            }
        }
    }

    return DefWindowProc(handle, message, wParam, lParam);
}


////////////////////////////////////////////////////////////
/// Entry point of application
///
/// \param Instance: Instance of the application
///
/// \return Error code
///
////////////////////////////////////////////////////////////
int main()
{
    HINSTANCE instance = GetModuleHandle(nullptr);

    // Define a class for our main window
    WNDCLASS windowClass;
    windowClass.style         = 0;
    windowClass.lpfnWndProc   = &onEvent;
    windowClass.cbClsExtra    = 0;
    windowClass.cbWndExtra    = 0;
    windowClass.hInstance     = instance;
    windowClass.hIcon         = nullptr;
    windowClass.hCursor       = nullptr;
    windowClass.hbrBackground = reinterpret_cast<HBRUSH>(COLOR_BACKGROUND);
    windowClass.lpszMenuName  = nullptr;
    windowClass.lpszClassName = TEXT("SFML App");
    RegisterClass(&windowClass);

    // Let's create the main window
    HWND window = CreateWindow(TEXT("SFML App"),
                               TEXT("SFML Win32"),
                               WS_SYSMENU | WS_VISIBLE,
                               200,
                               200,
                               660,
                               520,
                               nullptr,
                               nullptr,
                               instance,
                               nullptr);

    // Add a button for exiting
    button = CreateWindow(TEXT("BUTTON"), TEXT("Quit"), WS_CHILD | WS_VISIBLE, 560, 440, 80, 40, window, nullptr, instance, nullptr);

    // Let's create two SFML views
    HWND             view1 = CreateWindow(TEXT("STATIC"),
                              nullptr,
                              WS_CHILD | WS_VISIBLE | WS_CLIPSIBLINGS,
                              20,
                              20,
                              300,
                              400,
                              window,
                              nullptr,
                              instance,
                              nullptr);
    HWND             view2 = CreateWindow(TEXT("STATIC"),
                              nullptr,
                              WS_CHILD | WS_VISIBLE | WS_CLIPSIBLINGS,
                              340,
                              20,
                              300,
                              400,
                              window,
                              nullptr,
                              instance,
                              nullptr);
    sf::RenderWindow sfmlView1(view1);
    sf::RenderWindow sfmlView2(view2);

    // Load some textures to display
    const auto texture1 = sf::Texture::loadFromFile("resources/image1.jpg").value();
    const auto texture2 = sf::Texture::loadFromFile("resources/image2.jpg").value();
    sf::Sprite sprite1(texture1);
    sf::Sprite sprite2(texture2);
    sprite1.setOrigin(sf::Vector2f(texture1.getSize()) / 2.f);
    sprite1.setPosition(sprite1.getOrigin());

    // Create a clock for measuring elapsed time
    const sf::Clock clock;

    // Loop until a WM_QUIT message is received
    MSG message;
    message.message = static_cast<UINT>(~WM_QUIT);
    while (message.message != WM_QUIT)
    {
        if (PeekMessage(&message, nullptr, 0, 0, PM_REMOVE))
        {
            // If a message was waiting in the message queue, process it
            TranslateMessage(&message);
            DispatchMessage(&message);
        }
        else
        {
            const float time = clock.getElapsedTime().asSeconds();

            // Clear views
            sfmlView1.clear();
            sfmlView2.clear();

            // Draw sprite 1 on view 1
            sprite1.setRotation(sf::degrees(time * 100));
            sfmlView1.draw(sprite1);

            // Draw sprite 2 on view 2
            sprite2.setPosition({std::cos(time) * 100.f, 0.f});
            sfmlView2.draw(sprite2);

            // Display each view on screen
            sfmlView1.display();
            sfmlView2.display();
        }
    }

    // Close our SFML views before destroying the underlying window
    sfmlView1.close();
    sfmlView2.close();

    // Destroy the main window (all its child controls will be destroyed)
    DestroyWindow(window);

    // Don't forget to unregister the window class
    UnregisterClass(TEXT("SFML App"), instance);
}