159 lines
4.6 KiB
C++
159 lines
4.6 KiB
C++
// Filename: node.h
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// Created by: drose (26Oct98)
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//
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#ifndef NODE_H
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#define NODE_H
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#include <pandabase.h>
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#include "nodeRelation.h"
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#include "boundedObject.h"
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#include "nodeConnection.h"
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#include <typedWriteable.h>
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#include <referenceCount.h>
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#include <luse.h>
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class NodeAttributes;
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class RenderTraverser;
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class AllAttributesWrapper;
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class AllTransitionsWrapper;
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class BamWriter;
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class BamReader;
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class Datagram;
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class DatagramIterator;
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// This is the maximum number of graph types a node may simultaneously
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// exist in.
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static const int max_node_graphs = 2;
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////////////////////////////////////////////////////////////////////
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// Class : Node
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// Description : The base class for all scene graph nodes. A Node may
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// be joined to any number of other nodes, as a parent
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// or as a child, with any kind of relation arcs.
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////////////////////////////////////////////////////////////////////
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class EXPCL_PANDA Node : public TypedWriteable, public BoundedObject,
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virtual public ReferenceCount {
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// We can't simply inherit from TypedWriteableReferenceCount, because we need
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// to inherit virtually from ReferenceCount.
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public:
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static Node* const Null;
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PUBLISHED:
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Node();
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Node(const Node ©);
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public:
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void operator = (const Node ©);
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virtual ~Node();
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virtual Node *make_copy() const;
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Node *copy_subgraph(TypeHandle graph_type) const;
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virtual bool safe_to_flatten() const;
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virtual bool safe_to_transform() const;
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virtual void xform(const LMatrix4f &mat);
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virtual void transform_changed(NodeRelation *arc);
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PUBLISHED:
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int get_num_parents(TypeHandle type) const;
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NodeRelation *get_parent(TypeHandle type, int index) const;
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int get_num_children(TypeHandle type) const;
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NodeRelation *get_child(TypeHandle type, int index) const;
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public:
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// These functions will be called when the node is visited during
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// the indicated traversal.
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virtual void app_traverse() { }
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virtual void draw_traverse() { }
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virtual void dgraph_traverse() { }
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// This function is similar to another function in NodeTransition.
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// It may or may not intercept the render traversal.
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virtual bool sub_render(const AllAttributesWrapper &attrib,
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AllTransitionsWrapper &trans,
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RenderTraverser *trav);
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virtual bool has_sub_render() const;
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PUBLISHED:
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virtual void output(ostream &out) const;
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virtual void write(ostream &out, int indent_level = 0) const;
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public:
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// We reference-count the child pointer, but not the parent pointer,
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// to avoid circular reference counting.
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// The following members are public to allow low-overhead traversal
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// through the scene graph when necessary, but beware! It is not
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// safe to access these members directly outside of PANDA.DLL.
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// Instead, use the get_parent()/get_child() interface, above.
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INLINE_GRAPH const NodeConnection &find_connection(TypeHandle graph_type) const;
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INLINE_GRAPH NodeConnection *update_connection(TypeHandle graph_type);
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NodeConnection _connections[max_node_graphs];
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private:
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const NodeConnection &p_find_connection(TypeHandle graph_type) const;
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NodeConnection *p_update_connection(TypeHandle graph_type);
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static NodeConnection _empty_connection;
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protected:
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virtual void propagate_stale_bound();
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typedef map<Node *, Node *> InstanceMap;
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virtual Node *r_copy_subgraph(TypeHandle graph_type,
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InstanceMap &inst_map) const;
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virtual void r_copy_children(const Node *from, TypeHandle graph_type,
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InstanceMap &inst_map);
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public:
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static void register_with_read_factory(void);
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virtual void write_datagram(BamWriter* manager, Datagram &me);
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virtual int complete_pointers(vector_typedWriteable &plist,
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BamReader *manager);
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static TypedWriteable *make_Node(const FactoryParams ¶ms);
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protected:
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void fillin(DatagramIterator& scan, BamReader* manager);
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public:
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static TypeHandle get_class_type() {
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return _type_handle;
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}
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static void init_type() {
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TypedWriteable::init_type();
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BoundedObject::init_type();
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ReferenceCount::init_type();
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register_type(_type_handle, "Node",
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TypedWriteable::get_class_type(),
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BoundedObject::get_class_type(),
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ReferenceCount::get_class_type());
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}
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virtual TypeHandle get_type() const {
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return get_class_type();
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}
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virtual TypeHandle force_init_type() {init_type(); return get_class_type();}
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private:
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static TypeHandle _type_handle;
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};
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EXPCL_PANDA INLINE_GRAPH ostream & operator << (ostream &out, const Node &node);
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EXPCL_PANDA NodeRelation *
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find_arc(Node *parent, Node *child, TypeHandle graph_type);
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EXPCL_PANDA INLINE_GRAPH bool
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remove_child(Node *parent, Node *child, TypeHandle graph_type);
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#ifndef DONT_INLINE_GRAPH
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#include "node.I"
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#endif
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#endif
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