81 lines
2.7 KiB
C++
81 lines
2.7 KiB
C++
// Filename: workingNodePath.h
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// Created by: drose (16Mar02)
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//
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////////////////////////////////////////////////////////////////////
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//
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// PANDA 3D SOFTWARE
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// Copyright (c) Carnegie Mellon University. All rights reserved.
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//
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// All use of this software is subject to the terms of the revised BSD
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// license. You should have received a copy of this license along
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// with this source code in a file named "LICENSE."
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//
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////////////////////////////////////////////////////////////////////
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#ifndef WORKINGNODEPATH_H
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#define WORKINGNODEPATH_H
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#include "pandabase.h"
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#include "nodePath.h"
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#include "nodePathComponent.h"
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////////////////////////////////////////////////////////////////////
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// Class : WorkingNodePath
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// Description : This is a class designed to support low-overhead
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// traversals of the complete scene graph, with a memory
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// of the complete path through the graph at any given
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// point.
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//
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// You could just use a regular NodePath to do this, but
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// since the NodePath requires storing
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// NodePathComponents on each node as it is constructed,
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// and then removing them when it destructs, there is
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// considerable overhead in that approach.
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//
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// The WorkingNodePath eliminates this overhead (but
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// does not guarantee consistency if the scene graph
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// changes while the path is held).
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//
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// At any given point, you may ask the WorkingNodePath
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// for its actual NodePath, and it will construct and
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// return a new NodePath representing the complete
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// generated chain.
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////////////////////////////////////////////////////////////////////
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class EXPCL_PANDA_PGRAPH WorkingNodePath {
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public:
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INLINE WorkingNodePath(const NodePath &start);
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INLINE WorkingNodePath(const WorkingNodePath ©);
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INLINE WorkingNodePath(const WorkingNodePath &parent, PandaNode *child);
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INLINE ~WorkingNodePath();
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INLINE void operator = (const WorkingNodePath ©);
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bool is_valid() const;
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INLINE NodePath get_node_path() const;
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INLINE PandaNode *node() const;
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int get_num_nodes() const;
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PandaNode *get_node(int index) const;
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void output(ostream &out) const;
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private:
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PT(NodePathComponent) r_get_node_path() const;
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// Either one or the other of these pointers will be filled in, but
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// never both. We maintain a linked list of WorkingNodePath
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// objects, with a NodePathComponent at the head of the list.
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const WorkingNodePath *_next;
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PT(NodePathComponent) _start;
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PT(PandaNode) _node;
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};
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INLINE ostream &operator << (ostream &out, const WorkingNodePath &node_path);
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#include "workingNodePath.I"
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#endif
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