154 lines
3.2 KiB
C++
154 lines
3.2 KiB
C++
/**
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* $Id$
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*
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* ***** BEGIN GPL LICENSE BLOCK *****
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
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* All rights reserved.
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*
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* The Original Code is: all of this file.
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*
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* Contributor(s): none yet.
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*
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* ***** END GPL LICENSE BLOCK *****
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* Bounding Box
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*/
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#ifndef __SG_TREE_H__
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#define __SG_TREE_H__
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#include "MT_Point3.h"
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#include "SG_BBox.h"
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#include <set>
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class SG_Node;
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/**
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* SG_Tree.
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* Holds a binary tree of SG_Nodes.
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*/
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class SG_Tree
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{
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SG_Tree* m_left;
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SG_Tree* m_right;
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SG_Tree* m_parent;
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SG_BBox m_bbox;
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MT_Point3 m_center;
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MT_Scalar m_radius;
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SG_Node* m_client_object;
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public:
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SG_Tree();
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SG_Tree(SG_Tree* left, SG_Tree* right);
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SG_Tree(SG_Node* client);
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~SG_Tree();
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/**
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* Computes the volume of the bounding box.
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*/
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MT_Scalar volume() const;
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/**
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* Prints the tree (for debugging.)
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*/
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void dump() const;
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/**
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* Returns the left node.
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*/
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SG_Tree *Left() const;
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SG_Tree *Right() const;
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SG_Node *Client() const;
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SG_Tree* Find(SG_Node *node);
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/**
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* Gets the eight corners of this treenode's bounding box,
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* in world coordinates.
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* @param box: an array of 8 MT_Point3
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* @example MT_Point3 box[8];
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* treenode->get(box);
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*/
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void get(MT_Point3 *box) const;
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/**
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* Get the tree node's bounding box.
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*/
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const SG_BBox& BBox() const;
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/**
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* Test if the given bounding box is inside this bounding box.
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*/
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bool inside(const MT_Point3 &point) const;
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void SetLeft(SG_Tree *left);
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void SetRight(SG_Tree *right);
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MT_Point3 Center() const { return m_center; }
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MT_Scalar Radius() { return m_radius; }
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//friend class SG_TreeFactory;
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struct greater
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{
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bool operator()(const SG_Tree *a, const SG_Tree *b)
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{
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return a->volume() > b->volume();
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}
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};
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};
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/**
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* SG_TreeFactory generates an SG_Tree from a list of SG_Nodes.
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* It joins pairs of SG_Nodes to minimise the size of the resultant
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* bounding box.
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* cf building an optimised Huffman tree.
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* @warning O(n^3)!!!
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*/
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class SG_TreeFactory
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{
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typedef std::multiset<SG_Tree*, SG_Tree::greater> TreeSet;
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TreeSet m_objects;
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public:
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SG_TreeFactory();
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~SG_TreeFactory();
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/**
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* Add a node to be added to the tree.
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*/
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void Add(SG_Node* client);
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void Add(SG_Tree* tree);
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/**
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* Build the tree from the set of nodes added by
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* the Add method.
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*/
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SG_Tree* MakeTreeUp();
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/**
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* Build the tree from the set of nodes top down.
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*/
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SG_Tree* MakeTreeDown(SG_BBox &bbox);
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SG_Tree* MakeTree();
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};
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#endif /* __SG_BBOX_H__ */
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