C++ OnRender函数代码示例

/**
 * @brief Called on keypresses, clicks, etc.
 *
 * @param[in] event Describes the event that occurred.
 */
void MazeSolverApp::OnEvent(SDL_Event* event)
{
    if(event->type == SDL_QUIT)
    {
        running = false;
    }
    else if (event->type == SDL_KEYDOWN)
    {
        if (event->key.keysym.unicode == 'd')
        {
            /* Solve the maze with a depth-first search. */
            if (solver)
            {
                delete solver;
                solver = NULL;
            }

            solver = (MazeSolverBase *) new DepthFirstSolver(this);
            solver->solve(maze);
            OnRender();
        }
        else if (event->key.keysym.unicode == 'b')
        {
            /* Solve the maze with a breadth-first search. */
            if (solver)
            {
                delete solver;
                solver = NULL;
            }

            solver = (MazeSolverBase *) new BreadthFirstSolver(this);
            solver->solve(maze);
            OnRender();
        }
        else if (event->key.keysym.unicode == 'r')
        {
            /* Reset the maze. */
            if (solver)
            {
                delete solver;
                solver = NULL;
            }

            rb->create_maze();
            OnRender();
        }
        else if (event->key.keysym.unicode == 'q')
        {
            running = false;
        }
    }
}

//------------------------------------------------------------------------------
int CApp::OnExecute() {
    if(OnInit() == false) {
        return -1;
    }

    SDL_Event Event;

    while(Running) {
        if(AIenabled && CurrentPlayer && GameState == GAME_STATE_RUNNING)
        {
            GameClick(AIMove());
        }

        while(SDL_PollEvent(&Event)) {
            OnEvent(&Event);
        }

        OnLoop();
        OnRender();
    }

    OnCleanup();

    return 0;
}

int SampleApp::MainLoop()
{
    MSG msg = { 0 };

    while (WM_QUIT != msg.message)
    {
        if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
        else
        {
            LARGE_INTEGER pc;
            QueryPerformanceCounter(&pc);
            if (pc.QuadPart - prevCounter.QuadPart >= counterPerFrame)
            {
                LONGLONG elapsed = pc.QuadPart - prevCounter.QuadPart;
                prevCounter = pc;
                OnUpdate(elapsed);
                OnRender();
            }
        }
    }

    return (int)msg.wParam;
}

int main(int argc,char ** argv)
{
    // start GL context and O/S window using the GLFW helper library
    appDelegate.AppWillStart();
    FPS_Helper fpsHelper;
    fpsHelper.SetFixedFPS(30);
    InitOpenGL();

    appDelegate.AppDidStart();

    while (!glfwWindowShouldClose (mainWnd.window))
    {
        // wipe the drawing surface clear
        static double timer_last = 0;
        double curr_time = glfwGetTime();
        if(curr_time - timer_last > 0.2)
        {
            timer_last = timer_last + 0.02;
            OnTimer();
        }

        if(fpsHelper.Tick())
        {
            OnRender();
            // update other events like input handling
            glfwPollEvents ();
            // put the stuff we've been drawing onto the display
            glfwSwapBuffers (mainWnd.window);
        }
    }
    // close GL context and any other GLFW resources
    appDelegate.AppWillTerminate();
    glfwTerminate();
    return 0;
}

//Holds game logic together
int Game::OnStart() {
	//Initialize the game
	if (OnInit() == false) {
        return -1;
    }

	SDL_Event Event;

	//While game is running 
	while (running) {
		while (gameType == 0 && running) {
			while (SDL_PollEvent(&Event)) {
				OnEvent(&Event);
			}
			//meanwhile show menu
			showMenu();
		}
		while (SDL_PollEvent(&Event)) {
			//Handle user input
			OnEvent(&Event);
		}
		OnLoop();
		OnRender();
	}
 
    OnCleanUp();
 
    return 0;
};

void ConvexHullApp::add_to_hull(Tuple *p)
{
    hull.push_back(p);

    SDL_Delay(ANIMATION_DELAY);
    OnRender();
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    if ((message >= WM_MOUSEFIRST && message <= WM_MOUSELAST) ||
        (message >= WM_KEYFIRST && message <= WM_KEYLAST) ||
        (message >= WM_TOUCH && message <= WM_POINTERWHEEL))
    {
        GetCurrentInputMessageSource(&g_inputSource);
        InvalidateRect(g_hwnd, NULL, FALSE);
    }

    switch (message)
    {
        case WM_PAINT:
        case WM_DISPLAYCHANGE:
            {
                PAINTSTRUCT ps;
                HDC hdc = BeginPaint(hwnd, &ps);
                OnRender(hdc, ps.rcPaint);
                EndPaint(hwnd, &ps);
            }
            return 0;

        case WM_DESTROY:
            {
                PostQuitMessage(0);
            }
            return 1;
    }

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

int Main::OnExecute(CL_ParamList* pCL_Params)
{
	if(!OnInit(pCL_Params))
		return -1;

	SDL_Event Event;

	Uint32 t1,t2;
	float fTime = 0.0f;

	while(Running)
	{
		t1 = SDL_GetTicks();
		while(SDL_PollEvent(&Event))
		{
			if(Event.type == SDL_QUIT)
				Running = false;
			else OnEvent(&Event);
		}
		OnMove(fTime);
		OnRender();
		t2 = SDL_GetTicks();
		fTime = (float)(t2-t1)/1000.0f;
	}

	OnExit();
	return 1;
}

	void Game::OnExecute()
	{
		if (m_state != GameState::INIT_SUCCESSFUL)
		{
			std::cerr << "Game INIT was not successful." << std::endl;
			return;
		}

		m_state = GameState::RUNNING;
		CreateAsteroid(Asteroids::Asteroid::AsteroidSize::BIG, 1);

		SDL_Event event;
		while (m_state == GameState::RUNNING)
		{
			// Input polling
			//
			while (SDL_PollEvent(&event))
			{
				OnEvent(&event);
			}

			//
			OnUpdate();
			OnRender();
		}
	}

// Called whenever the client area needs to be drawn
HRESULT FirstTry::OnPaint()
{
	// Update the animation manager with the current time
	UI_ANIMATION_SECONDS secondsNow;
	HRESULT hr = m_pAnimationTimer->GetTime(&secondsNow);
	if (SUCCEEDED(hr))
	{
		hr = m_pAnimationManager->Update(secondsNow);

		// Read the values of the animation variables and draw the client area
		hr = OnRender();
		if (SUCCEEDED(hr))
		{
			// Continue redrawing the client area as long as there are animations scheduled.
			UI_ANIMATION_MANAGER_STATUS status;
			hr = m_pAnimationManager->GetStatus(&status);
			if (SUCCEEDED(hr))
			{
				if (status == UI_ANIMATION_MANAGER_BUSY)
				{
					InvalidateRect(m_hwnd, NULL, FALSE);
				}					
			}
		}
	}

	return hr;
}

/**
 * @brief Called on keypresses, clicks, etc.
 * 
 * @param[in] event Describes the event that occurred.
 */
void LineApp::OnEvent(SDL_Event* event)
{
    if(event->type == SDL_QUIT)
    {
        running = false;
    }
    else if (event->type == SDL_KEYDOWN)
    {
        if (event->key.keysym.unicode == 'q')
        {
            running = false;
        }
        else if (event->key.keysym.unicode == 'l')
        {
            DoLineAlg();
        }
        else if (event->key.keysym.unicode == 'c')
        {
            delete_all();
        }
    }
    else if (event->type == SDL_MOUSEBUTTONDOWN)
    {
        if (event->button.state == SDL_PRESSED)
        {
            int x = event->button.x;
            int y = event->button.y;
            points.push_back(new Tuple(x, y));
        }
        OnRender();
    }
}

void MainGameLoop::Run()
{
   FrameCounter fc;

   // main game loop
   while (!m_bExitLoop)
   {
      OnTick();

      ProcessEvents();
      if (m_bExitLoop)
         break;

      if (!m_bAppActive)
      {
         // as we're not visible, just wait for next event
         SDL_WaitEvent(NULL);
         continue;
      }

      // render the scene
      {
         OpenGL::ResetPolycount();

         OnRender();

         fc.OnNextFrame();
      }

      // count ticks for fps
      double dFramesPerSecond;
      if (m_bUpdateFrameCount && fc.GetUpdatedCount(dFramesPerSecond))
         UpdateCaption(dFramesPerSecond);
   }
}

void CApplication::MainLoop()
{
    SDL_Event event;
    Uint32 startTime, elapsedTime;

    while( !m_Quit )
    {
        // Le temps avant l'éxécution
        startTime = SDL_GetTicks();
        // Tant qu'il y a des messages, les traiter
        while( SDL_PollEvent(&event) )
        {
            OnEvent(event);
        }
        // Mise à jour de la scène
        OnUpdate();
        // Démarrer le rendu
        m_Renderer.BeginScene();
        OnRender();
        m_Renderer.EndScene();

        // Si on a mis moins de temps que le nombre de FPS demandé, on attend
        // permet de limiter les fps et de gagner du temps de process CPU
        if( (elapsedTime = SDL_GetTicks()-startTime) < m_FPSLimit )
        {
            SDL_Delay(m_FPSLimit - elapsedTime);
        }
    }
}

int App::OnExecute()
{
    if(OnInit() == false)
    {
        return -1;
    }

	controller->Initialize();

    SDL_Event Event;
    while(running)
    {
        Scene* scene = controller->GetCurrentScene();
		if (scene == NULL)
		{
			break;
		}

        if(SDL_PollEvent(&Event))
        {
            OnEvent(scene, &Event);
        }

        OnLoop(scene);
        OnRender(scene);
    }

    OnCleanup();

    return 0;
}

int CApp::OnExecute(){

    if (OnInit() == false){
        return -1;
    }

    SDL_Event Event;

    while(Running){

        while(SDL_PollEvent(&Event)){

            OnEvent(&Event);

        }

        OnLoop();
        OnRender();

    }


    OnCleanup();

    return 0;
}