154 lines
5.1 KiB
C++
154 lines
5.1 KiB
C++
/****************************************************************************
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* VCGLib o o *
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* Visual and Computer Graphics Library o o *
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* _ O _ *
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* Copyright(C) 2004-2016 \/)\/ *
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* Visual Computing Lab /\/| *
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* ISTI - Italian National Research Council | *
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* \ *
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* All rights reserved. *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (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 (http://www.gnu.org/licenses/gpl.txt) *
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* for more details. *
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* *
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****************************************************************************/
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/****************************************************************************
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History
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$Log: not supported by cvs2svn $
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Revision 1.1 2005/09/26 18:33:16 m_di_benedetto
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First Commit.
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****************************************************************************/
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#ifndef __VCGLIB_AABBBINARYTREE_CLOSEST_H
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#define __VCGLIB_AABBBINARYTREE_CLOSEST_H
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// stl headers
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#include <limits>
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#include <vector>
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// vcg headers
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#include <vcg/math/base.h>
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#include <vcg/space/index/aabb_binary_tree/base.h>
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#include <wrap/utils.h>
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/***************************************************************************/
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namespace vcg {
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template <class TREETYPE>
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class AABBBinaryTreeClosest {
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public:
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typedef AABBBinaryTreeClosest<TREETYPE> ClassType;
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typedef TREETYPE TreeType;
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typedef typename TreeType::ScalarType ScalarType;
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typedef typename TreeType::CoordType CoordType;
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typedef typename TreeType::NodeType NodeType;
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typedef typename TreeType::ObjPtr ObjPtr;
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template <class OBJPOINTDISTANCEFUNCT>
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static inline ObjPtr Closest(TreeType & tree, OBJPOINTDISTANCEFUNCT & getPointDistance, const CoordType & p, const ScalarType & maxDist, ScalarType & minDist, CoordType & q) {
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typedef std::vector<NodeType *> NodePtrVector;
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typedef typename NodePtrVector::const_iterator NodePtrVector_ci;
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NodeType * pRoot = tree.pRoot;
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if (pRoot == 0) {
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return (0);
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}
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NodePtrVector clist1;
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NodePtrVector clist2;
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NodePtrVector leaves;
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NodePtrVector * candidates = &clist1;
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NodePtrVector * newCandidates = &clist2;
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clist1.reserve(tree.pObjects.size());
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clist2.reserve(tree.pObjects.size());
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leaves.reserve(tree.pObjects.size());
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clist1.resize(0);
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clist2.resize(0);
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leaves.resize(0);
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ScalarType minMaxDist = maxDist * maxDist;
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candidates->push_back(pRoot);
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while (!candidates->empty()) {
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newCandidates->resize(0);
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for (NodePtrVector_ci bv=candidates->begin(); bv!=candidates->end(); ++bv) {
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const CoordType dc = Abs(p - (*bv)->boxCenter);
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const ScalarType maxDist = (dc + (*bv)->boxHalfDims).SquaredNorm();
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(*bv)->ScalarValue() = LowClampToZero(dc - (*bv)->boxHalfDims).SquaredNorm();
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if (maxDist < minMaxDist) {
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minMaxDist = maxDist;
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}
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}
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for (NodePtrVector_ci ci=candidates->begin(); ci!=candidates->end(); ++ci) {
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if ((*ci)->ScalarValue() < minMaxDist) {
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if ((*ci)->IsLeaf()) {
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leaves.push_back(*ci);
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}
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else {
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if ((*ci)->children[0] != 0) {
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newCandidates->push_back((*ci)->children[0]);
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}
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if ((*ci)->children[1] != 0) {
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newCandidates->push_back((*ci)->children[1]);
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}
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}
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}
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}
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NodePtrVector * cSwap = candidates;
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candidates = newCandidates;
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newCandidates = cSwap;
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}
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clist1.clear();
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clist2.clear();
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ObjPtr closestObject = 0;
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CoordType closestPoint;
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ScalarType closestDist = math::Sqrt(minMaxDist) + std::numeric_limits<ScalarType>::epsilon();
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ScalarType closestDistSq = closestDist * closestDist;
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for (NodePtrVector_ci ci=leaves.begin(); ci!=leaves.end(); ++ci) {
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if ((*ci)->ScalarValue() < closestDistSq) {
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for (typename TreeType::ObjPtrVectorConstIterator si=(*ci)->oBegin; si!=(*ci)->oEnd; ++si) {
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if (getPointDistance(*(*si), p, closestDist, closestPoint)) {
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closestDistSq = closestDist * closestDist;
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closestObject = (*si);
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q = closestPoint;
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minDist = closestDist;
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}
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}
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}
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}
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leaves.clear();
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return (closestObject);
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}
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};
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} // end namespace vcg
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#endif // #ifndef __VCGLIB_AABBBINARYTREE_CLOSEST_H
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