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C-/C++-Quelltext

    //main message loop

    while (!done)
    {
          PeekMessage(&msg, NULL, NULL, NULL, PM_REMOVE);
          
          if (msg.message == WM_QUIT)   //do you receive a WM_QUIT message?

          {
          done = true;                  //if so, time to quit the application

          }
          else
          {                             //do rendering here

          //clear screen and depth buffer

          if (Cleared == false) //temporary prevention of clearing the screen

          glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
          Cleared = true;
          
          glLoadIdentity();           //reset modelview matrix

          //-------------------------------------------------------------------

          
          glPointSize(5);
          
          glTranslatef(0.0f, 0.0f, -10.0f);
          
          glColor3f(1.0f, 0.0f, 0.0f);        //set color to red

          
          //Input:-------------------------------------------------------------

          
          if (GetAsyncKeyState(0x31))        // "1" pressed?

          {
             if (act_timer == 0)
             {
             act_timer = DELAY_TIME;
             angle += 0.05;
             }
          }
          
          if (GetAsyncKeyState(0x51))        // "Q" pressed?

          {
             if (act_timer == 0)
             {
             act_timer = DELAY_TIME;
             angle -= 0.05;
             }
          }
          
          //------------------------------------------------------------------- 

          
          if (angle >= 360.0f || angle <= -360.0f)        //reset angle counter

          angle = 0.0f;
          
          if (std_timer == DELAY_TIME)
          {
          std_timer = 0;
          x += (cos(angle)) * 0.05; //get new x value using angle functions

          y += (sin(angle)) * 0.05; //get new y value using angle functions

          }
          
          glBegin(GL_POINTS);              //draw the "head" of the snake

              glVertex3f(x, y, 0);
          glEnd();
          
          if (act_timer > 0)
          act_timer--;
          
          std_timer++;
          Sleep(1);
          
          //-------------------------------------------------------------------

          
          SwapBuffers(g_HDC);                 //bring back buffer to foreground

          
          TranslateMessage(&msg);           //translate/dispatch to event queue

          DispatchMessage(&msg);      
          }
    }