4 // Copyright (C) 2006 Matthias Braun <matze@braunis.de>
6 // This program is free software; you can redistribute it and/or
7 // modify it under the terms of the GNU General Public License
8 // as published by the Free Software Foundation; either version 2
9 // of the License, or (at your option) any later version.
11 // This program is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
16 // You should have received a copy of the GNU General Public License
17 // along with this program; if not, write to the Free Software
18 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 #ifndef SUPERTUX_GAMEOBJECT_H
20 #define SUPERTUX_GAMEOBJECT_H
23 #include "refcounter.hpp"
24 #include "lisp/lisp.hpp"
27 class ObjectRemoveListener;
30 * This is a base class for all game objects. Each sector of a level will hold a
31 * list of active GameObject while the game is played.
33 * This class is responsible for:
34 * - Updating and Drawing the object. This should happen in the update() and
35 * draw() functions. Both are called once per frame.
36 * - Providing a safe way to remove the object by calling the remove_me
38 * - a 32bit bitset for flags...
40 class GameObject : public RefCounter
43 GameObject(std::string name = "");
44 GameObject(const lisp::Lisp& lisp);
45 virtual ~GameObject();
47 /** This function is called once per frame and allows the object to update
48 * it's state. The elapsed_time is the time since the last frame in
49 * seconds and should be the base for all timed calculations (don't use
50 * SDL_GetTicks directly as this will fail in pause mode)
52 virtual void update(float elapsed_time) = 0;
54 /** The GameObject should draw itself onto the provided DrawingContext if this
57 virtual void draw(DrawingContext& context) = 0;
59 /** returns true if the object is not scheduled to be removed yet */
65 /** schedules this object to be removed at the end of the frame */
71 /** registers a remove listener which will be called if the object
72 * gets removed/destroyed
74 void add_remove_listener(ObjectRemoveListener* listener)
76 RemoveListenerListEntry* entry = new RemoveListenerListEntry();
77 entry->next = remove_listeners;
78 entry->listener = listener;
80 remove_listeners = entry;
83 std::string get_name() const
87 // --- BEGIN METHODS TO EXPOSE TO SQUIRREL --- //
88 //void set_visible(bool visible);
90 // --- END METHODS TO EXPOSE TO SQUIRREL --- //
93 /** this flag indicates if the object should be removed at the end of the
98 struct RemoveListenerListEntry
100 RemoveListenerListEntry* next;
101 ObjectRemoveListener* listener;
103 RemoveListenerListEntry* remove_listeners;
106 std::string name; /**< user-defined name for use in scripts or empty string if not scriptable */
109 #endif /*SUPERTUX_GAMEOBJECT_H*/