Wartbed:Manual/Theatre of War

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Revision as of 17:13, 27 February 2010

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Theatre and SceneElements

The Theatre class represents the world by containing all SceneElement Props constituting it. Unit movement and pathfinding does not primarily use the Theatre contents, but instead calls on a node-space representation of the map.

SceneElements are all specialisations of Prop, which in turn is a specialisation of mvc::Model. Thus, all scene elements can be used transparently with all other models inside the MVC architecture. Scene elements are not Actors, though, and can't be issued Orders.

This part of WARTBED intentionally uses the theatre metaphor because of its good fit and relevant separation of responsibilities.

Generic overview:

typedef shared_ptr<SceneElement *> SCENE_ELEMENT;
 
class Theatre
{
    SCENE_ELEMENT root;
    ...
};
 
namespace theatre
{
    class SceneElement : public Prop
    {
        ...
    };
 
    class ElementGroup : SceneElement
    {
        ...
    };
 
    class Light : SceneElement
    {
        ...
    };
 
    class Indicator : SceneElement
    {
        ...
    };
}

The Theatre contains specialisations of SceneElement stored in SCENE_ELEMENT smart pointers. All elements are nodes in a hierarchy, starting at Theatre::root.

All scene elements are Props, and all are created through an abstract factory. Thus, the Theatre class and subscribing code need not care about the underlying implementation of the scene components, which means that the same architecture can be used both for server and client modules.

Weather

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