C++ SpaceStation::IsGroundStation方法代码示例

/*
 * Method: GetGroundPosition
 *
 * Get latitude, longitude of a station on the ground or nil if this is an orbital station
 *
 * > latitude, longitude = station:GetGroundPosition()
 *
 * Returns:
 *
 *   latitude - the latitude of the station in radians
 *   longitude - the longitude of the station in radians
 *
 * Examples:
 *
 * > -- Get ground position of L.A. when starting on Earth
 * > local la = Game.player:GetDockedWith()
 * > local lat, long = la:GetGroundPosition()
 * > lat = math.rad2deg(lat)
 * > long = math.rad2deg(long)
 *
 * Availability:
 *
 *   July 2013
 *
 * Status:
 *
 *   experimental
 */
static int l_spacestation_get_ground_position(lua_State *l)
{
	SpaceStation *s = LuaObject<SpaceStation>::CheckFromLua(1);
	if (!s->IsGroundStation())
		return 0;

	vector3d pos = s->GetPosition();
	double latitude = atan2(pos.y, sqrt(pos.x*pos.x + pos.z * pos.z));
	double longitude = atan2(pos.x, pos.z);
	lua_pushnumber(l, latitude);
	lua_pushnumber(l, longitude);
	return 2;
}

void Pi::Start()
{
	WorldView *view = new WorldView();
	
	Gui::Fixed *splash = new Gui::Fixed(Gui::Screen::GetWidth(), Gui::Screen::GetHeight());
	Gui::Screen::AddBaseWidget(splash, 0, 0);
	splash->SetTransparency(true);

	const float w = Gui::Screen::GetWidth() / 2;
	const float h = Gui::Screen::GetHeight() / 2;
	const int OPTS = 5;
	Gui::ToggleButton *opts[OPTS];
	opts[0] = new Gui::ToggleButton(); opts[0]->SetShortcut(SDLK_1, KMOD_NONE);
	opts[1] = new Gui::ToggleButton(); opts[1]->SetShortcut(SDLK_2, KMOD_NONE);
	opts[2] = new Gui::ToggleButton(); opts[2]->SetShortcut(SDLK_3, KMOD_NONE);
	opts[3] = new Gui::ToggleButton(); opts[3]->SetShortcut(SDLK_4, KMOD_NONE);
	opts[4] = new Gui::ToggleButton(); opts[4]->SetShortcut(SDLK_5, KMOD_NONE);
	splash->Add(opts[0], w, h-64);
	splash->Add(new Gui::Label("New game starting on Earth"), w+32, h-64);
	splash->Add(opts[1], w, h-32);
	splash->Add(new Gui::Label("New game starting on Epsilon Eridani"), w+32, h-32);
	splash->Add(opts[2], w, h);
	splash->Add(new Gui::Label("New game starting on debug point"), w+32, h);
	splash->Add(opts[3], w, h+32);
	splash->Add(new Gui::Label("Load a saved game"), w+32, h+32);
	splash->Add(opts[4], w, h+64);
	splash->Add(new Gui::Label("Quit"), w+32, h+64);

	splash->ShowAll();

	int choice = 0;
	Uint32 last_time = SDL_GetTicks();
	float _time = 0;
	do {
		Pi::HandleEvents();

		Render::PrepareFrame();
		glMatrixMode(GL_PROJECTION);
		glLoadIdentity();
		float fracH = 1.0 / Pi::GetScrAspect();
		glFrustum(-1, 1, -fracH, fracH, 1.0f, 10000.0f);
		glMatrixMode(GL_MODELVIEW);
		glLoadIdentity();
		glClearColor(0,0,0,0);
		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
		SDL_ShowCursor(1);
		SDL_WM_GrabInput(SDL_GRAB_OFF);

		draw_intro(view, _time);
		Render::PostProcess();
		Gui::Draw();
		Render::SwapBuffers();
		
		Pi::frameTime = 0.001*(SDL_GetTicks() - last_time);
		_time += Pi::frameTime;
		last_time = SDL_GetTicks();

		// poll ui instead of using callbacks :-J
		for (int i=0; i<OPTS; i++) if (opts[i]->GetPressed()) choice = i+1;
	} while (!choice);
	splash->HideAll();
	
	Gui::Screen::RemoveBaseWidget(splash);
	delete splash;
	delete view;
	
	InitGame();


	if (choice == 1) {
		/* Earth start point */
		SBodyPath path(0,0,0);
		Space::DoHyperspaceTo(&path);
		//Frame *pframe = *(++(++(Space::rootFrame->m_children.begin())));
		//player->SetFrame(pframe);
		// XXX there isn't a sensible way to find stations for a planet.
		SpaceStation *station = 0;
		for (Space::bodiesIter_t i = Space::bodies.begin(); i!=Space::bodies.end(); i++) {
			if ((*i)->IsType(Object::SPACESTATION)) { station = (SpaceStation*)*i; break; }
		}
		assert(station);
		player->SetPosition(vector3d(0,0,0));
		player->SetFrame(station->GetFrame());
		player->SetDockedWith(station, 0);
		MainLoop();
	} else if (choice == 2) {
		/* Epsilon Eridani start point */
		SBodyPath path(1,0,2);
		Space::DoHyperspaceTo(&path);
		// XXX there isn't a sensible way to find stations for a planet.
		SpaceStation *station = 0;
		for (Space::bodiesIter_t i = Space::bodies.begin(); i!=Space::bodies.end(); i++) {
			if ((*i)->IsType(Object::SPACESTATION)) {
				station = (SpaceStation*)*i;
				if (!station->IsGroundStation()) break;
			}
		}
		assert(station);
		player->SetPosition(vector3d(0,0,0));
		player->SetFrame(station->GetFrame());
//.........这里部分代码省略.........

/*
 * Attribute: isGroundStation
 *
 * true if station is on the ground, false if its an orbital
 *
 * Availability:
 *
 *   alpha 30
 *
 * Status:
 *
 *   experimental
 */
static int l_spacestation_attr_is_ground_station(lua_State *l)
{
	SpaceStation *s = LuaObject<SpaceStation>::CheckFromLua(1);
	lua_pushboolean(l, s->IsGroundStation());
	return 1;
}