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VHierarchy.cc
1 /* ========================================================================= *
2 * *
3 * OpenMesh *
4 * Copyright (c) 2001-2015, RWTH-Aachen University *
5 * Department of Computer Graphics and Multimedia *
6 * All rights reserved. *
7 * www.openmesh.org *
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10 * This file is part of OpenMesh. *
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40 * ========================================================================= */
41
42 /*===========================================================================*\
43 * *
44 * $Revision$ *
45 * $Date$ *
46 * *
47 \*===========================================================================*/
48
49 //=============================================================================
50 //
51 // CLASS newClass - IMPLEMENTATION
52 //
53 //=============================================================================
54
55
56 //== INCLUDES =================================================================
57
58 #include <OpenMesh/Tools/VDPM/VHierarchy.hh>
59
60
61 //== NAMESPACES ===============================================================
62
63 namespace OpenMesh {
64 namespace VDPM {
65
66 //== IMPLEMENTATION ==========================================================
67
68
69 VHierarchy::
70 VHierarchy() :
71 n_roots_(0), tree_id_bits_(0)
72 {
73 clear();
74 }
75
76 void
77 VHierarchy::
78 set_num_roots(unsigned int _n_roots)
79 {
80 n_roots_ = _n_roots;
81
82 tree_id_bits_ = 0;
83 while (n_roots_ > ((unsigned int) 0x00000001 << tree_id_bits_))
84 ++tree_id_bits_;
85 }
86
87
88 VHierarchyNodeHandle
89 VHierarchy::
90 add_node()
91 {
92 return add_node(VHierarchyNode());
93 }
94
95 VHierarchyNodeHandle
96 VHierarchy::
97 add_node(const VHierarchyNode &_node)
98 {
99 nodes_.push_back(_node);
100
101 return VHierarchyNodeHandle(int(nodes_.size() - 1));
102 }
103
104
105 void
106 VHierarchy::
107 make_children(VHierarchyNodeHandle &_parent_handle)
108 {
109 VHierarchyNodeHandle lchild_handle = add_node();
110 VHierarchyNodeHandle rchild_handle = add_node();
111
112 VHierarchyNode &parent = node(_parent_handle);
113 VHierarchyNode &lchild = node(lchild_handle);
114 VHierarchyNode &rchild = node(rchild_handle);
115
116 parent.set_children_handle(lchild_handle);
117 lchild.set_parent_handle(_parent_handle);
118 rchild.set_parent_handle(_parent_handle);
119
120 lchild.set_index(VHierarchyNodeIndex(parent.node_index().tree_id(tree_id_bits_), 2*parent.node_index().node_id(tree_id_bits_), tree_id_bits_));
121 rchild.set_index(VHierarchyNodeIndex(parent.node_index().tree_id(tree_id_bits_), 2*parent.node_index().node_id(tree_id_bits_)+1, tree_id_bits_));
122 }
123
124 VHierarchyNodeHandle
125 VHierarchy::
126 node_handle(VHierarchyNodeIndex _node_index)
127 {
128 if (_node_index.is_valid(tree_id_bits_) != true)
129 return InvalidVHierarchyNodeHandle;
130
131 VHierarchyNodeHandle node_handle = root_handle(_node_index.tree_id(tree_id_bits_));
132 unsigned int node_id = _node_index.node_id(tree_id_bits_);
133 unsigned int flag = 0x80000000;
134
135 while (!(node_id & flag)) flag >>= 1;
136 flag >>= 1;
137
138 while (flag > 0 && is_leaf_node(node_handle) != true)
139 {
140 if (node_id & flag) // 1: rchild
141 {
142 node_handle = rchild_handle(node_handle);
143 }
144 else // 0: lchild
145 {
146 node_handle = lchild_handle(node_handle);
147 }
148 flag >>= 1;
149 }
150
151 return node_handle;
152 }
153
154 bool
155 VHierarchy::
156 is_ancestor(VHierarchyNodeIndex _ancestor_index, VHierarchyNodeIndex _descendent_index)
157 {
158 if (_ancestor_index.tree_id(tree_id_bits_) != _descendent_index.tree_id(tree_id_bits_))
159 return false;
160
161 unsigned int ancestor_node_id = _ancestor_index.node_id(tree_id_bits_);
162 unsigned int descendent_node_id = _descendent_index.node_id(tree_id_bits_);
163
164 if (ancestor_node_id > descendent_node_id)
165 return false;
166
167 while (descendent_node_id > 0)
168 {
169 if (ancestor_node_id == descendent_node_id)
170 return true;
171 descendent_node_id >>= 1; // descendent_node_id /= 2
172 }
173
174 return false;
175 }
176
177 //=============================================================================
178 } // namespace VDPM
179 } // namespace OpenMesh
180 //=============================================================================
OpenMesh
Definition: MeshItems.hh:64