simple_attribs.cpp 6.99 KB
Newer Older
Sylvain Thery's avatar
Sylvain Thery committed
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
/*******************************************************************************
* CGoGN: Combinatorial and Geometric modeling with Generic N-dimensional Maps  *
* version 0.1                                                                  *
* Copyright (C) 2009-2012, IGG Team, LSIIT, University of Strasbourg           *
*                                                                              *
* This library is free software; you can redistribute it and/or modify it      *
* under the terms of the GNU Lesser General Public License as published by the *
* Free Software Foundation; either version 2.1 of the License, or (at your     *
* option) any later version.                                                   *
*                                                                              *
* This library is distributed in the hope that it will be useful, but WITHOUT  *
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or        *
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License  *
* for more details.                                                            *
*                                                                              *
* You should have received a copy of the GNU Lesser General Public License     *
* along with this library; if not, write to the Free Software Foundation,      *
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA.           *
*                                                                              *
* Web site: http://cgogn.unistra.fr/                                           *
* Contact information: cgogn@unistra.fr                                        *
*                                                                              *
*******************************************************************************/


#include "Topology/generic/parameters.h"
#include "Topology/map/embeddedMap2.h"
#include "Algo/Tiling/Surface/square.h"


using namespace CGoGN ;

/**
 * Struct that contains some informations about the types of the manipulated objects
 * Mainly here to be used by the algorithms that are parameterized by it
 */
struct PFP: public PFP_STANDARD
{
	// definition of the type of the map
	typedef EmbeddedMap2 MAP;
};

// some typedef shortcuts
typedef PFP::MAP MAP ;				// map type
typedef PFP::MAP::IMPL MAP_IMPL ;	// map implementation
typedef PFP::VEC3 VEC3 ;			// type of R³ vector 

/**
 * @brief get attribute
 * @param map
 */
void byNames(MAP& map, const std::string& name)
{
	VertexAttribute<VEC3, MAP_IMPL> testPos = map.getAttribute<VEC3, VERTEX>(name);
	if (testPos.isValid())
		std::cout << "Attribute "<< name <<" valid"<< std::endl;
	else
		std::cout << "Attribute "<< name <<"invalid"<< std::endl;
}

/**
 * @brief computeLengthEdges
 * @param map the map
 * @param pos attribute handler of position of vertices
 * @param len attribute handler of length of edges
 */
void computeLengthEdges(MAP& map,const VertexAttribute<VEC3, MAP_IMPL>& pos, EdgeAttribute<float, MAP_IMPL> len)
{
	// warning c++11 lambda syntax
	foreach_cell<EDGE>(map,[&](Edge e) // for all edge e of map do
	{
		VEC3 P1 = pos[e.dart]; // access with dart because of access to VertexAttribute with an edge
		VEC3 P2 = pos[map.phi1(e)]; // phi1 return a dart so no problem (and e can auto-cast in dart)
		VEC3 V = P2 - P1;
		len[e] = V.norm();
	});
}


void computeNewPositions(MAP& map, VertexAttribute<VEC3, MAP_IMPL>& pos)
{
	// here we need new and old positions simultaneously so create temporary position

	VertexAutoAttribute<VEC3, MAP_IMPL> pos2(map);

	foreach_cell<VERTEX>(map,[&](Vertex v)  // for all vertices
	{
		int nb=0;
		pos2[v] = VEC3(0,0,0);// init with 0,0,0,
		foreach_adjacent2<EDGE>(map,v,[&](Vertex x) // for all its neighbours (by edges)
		{
			pos2[v] += pos[x];
			nb++;
		});
		pos2[v] /= nb;
	});

	// swap attribute position with temporary (constant complexity !)
	map.swapAttributes(pos,pos2);
}

/**
* @brief dump any attribute
* @param attr attribute
*/
template<typename ATTRIB>
void dumpAttribute(const ATTRIB& attr)
{
	std::cout << "Attribute " <<attr.name() << " of orbit "<< orbitName(attr.getOrbit())<< " of type "<< attr.typeName()<< std::endl;

	// NEVER USE 0 AND ++ IN FOR LOOP ON ATTRIBUTE !
	// USE ONLY BEGIN / END / NEXT (for hole jumping over)
	for (unsigned int i=attr.begin(); i!=attr.end(); attr.next(i))
	{
		std::cout << attr.name() << "["<< i << "] = "<<attr[i]<< std::endl;
	}
}


int main()
{
	// declare a map to handle the mesh
	MAP myMap;

	// add position attribute on vertices and get handler on it
	VertexAttribute<VEC3, MAP_IMPL> positionAtt = myMap.addAttribute<VEC3, VERTEX>("position");
	if (!positionAtt.isValid())
		std::cerr << "impossible to create an attribute with name position (already used ?)"<< std::endl;


	// create a topo grid of 2x2 squares
	Algo::Surface::Tilings::Square::Grid<PFP> grid(myMap, 2, 2, true);
	// and embed it using position attribute
	grid.embedIntoGrid(positionAtt, 1.,1.,0.);


	// add an attribute of type float on orbit EDGE
	EdgeAttribute<float, MAP_IMPL> lengthAtt = myMap.addAttribute<float, EDGE>("length");
	if (!lengthAtt.isValid())
		std::cerr << "impossible to create the attribute"<< std::endl;

	computeLengthEdges(myMap,positionAtt,lengthAtt);

	// add an attribute of type std::string on orbit FACE
	FaceAttribute<std::string, MAP_IMPL> nameAtt = myMap.addAttribute<std::string, FACE>("name");
	if (!nameAtt.isValid())
		std::cerr << "impossible to create the attribute"<< std::endl;

	// for complex type use following template (function nameOfType not applicable)
	EdgeAttribute< NoTypeNameAttribute< std::vector<int> >, MAP_IMPL> vectAtt = myMap.addAttribute< NoTypeNameAttribute< std::vector<int> >, EDGE>("vector_of_int");
	if (!vectAtt.isValid())
		std::cerr << "impossible to create the attribute"<< std::endl;

	Dart d = myMap.begin();
	// define a vertex from a dart
	Vertex v(d);
	// define a face from a dart
	Face f(d);

	// [] operator can take a dart, a cell (only same off attribute), or an unsigned inf
	// access to any attributes with darts
	std::cout << positionAtt[d]<< std::endl;
	nameAtt[d] = "Hello";
	lengthAtt[myMap.phi1(d)] = 54.0f;

	std::vector<int> vi = {3,5,7,9,11};
	vectAtt[d]= vi;
	vectAtt[d].push_back(11);

	// access to VertexAttribute with a Vertex
	std::cout << positionAtt[v]<< std::endl;

	// access to FaceAttribute with a Face
	std::cout << nameAtt[f]<< std::endl;

// following line does not compile because of wrong cell type
//	std::cout << positionAtt[f]<< std::endl;
//  possible to bypass using dart access
	std::cout << positionAtt[f.dart]<< std::endl;

	// possible to have any number of attribute a same ORBIT
	VertexAttribute<VEC3, MAP_IMPL> position2Att = myMap.addAttribute<VEC3, VERTEX>("other_position");

	// copy of attribute of same type (linear complexity)
	myMap.copyAttribute(position2Att,positionAtt);

	positionAtt[v] += VEC3(0,0,1);

	computeNewPositions(myMap,positionAtt);

	dumpAttribute(positionAtt);

	byNames(myMap,"position");

	myMap.removeAttribute<VEC3, VERTEX>(positionAtt);

	byNames(myMap,"position");


	return 0;
}