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author | glisse <glisse@636b058d-ea47-450e-bf9e-a15bfbe3eedb> | 2016-12-12 05:43:06 +0000 |
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committer | glisse <glisse@636b058d-ea47-450e-bf9e-a15bfbe3eedb> | 2016-12-12 05:43:06 +0000 |
commit | ad6a64ad5a4f4121410250021eda0904eb9c718c (patch) | |
tree | fdad2e783a79b388cde1826e3b344d8977d1183a /src/Alpha_complex/doc | |
parent | f9a32a464156dd61b444f0e70c8342642363e8ea (diff) | |
parent | f0e5330a88f9e89a887769ab79f6db6dd4e1c35a (diff) |
Merge from trunk.
git-svn-id: svn+ssh://scm.gforge.inria.fr/svnroot/gudhi/branches/qt5@1848 636b058d-ea47-450e-bf9e-a15bfbe3eedb
Former-commit-id: c8e1376894207c8c08896f750f71c115e07f6d95
Diffstat (limited to 'src/Alpha_complex/doc')
-rw-r--r-- | src/Alpha_complex/doc/Intro_alpha_complex.h | 176 | ||||
-rw-r--r-- | src/Alpha_complex/doc/alpha_complex_doc.ipe | 296 | ||||
-rw-r--r-- | src/Alpha_complex/doc/alpha_complex_doc.png | bin | 0 -> 18720 bytes | |||
-rw-r--r-- | src/Alpha_complex/doc/alpha_complex_doc_420.ipe | 514 | ||||
-rw-r--r-- | src/Alpha_complex/doc/alpha_complex_doc_420.png | bin | 0 -> 80794 bytes | |||
-rw-r--r-- | src/Alpha_complex/doc/alpha_complex_representation.ipe | 321 | ||||
-rw-r--r-- | src/Alpha_complex/doc/alpha_complex_representation.png | bin | 0 -> 14606 bytes |
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diff --git a/src/Alpha_complex/doc/Intro_alpha_complex.h b/src/Alpha_complex/doc/Intro_alpha_complex.h new file mode 100644 index 00000000..3ffdae7f --- /dev/null +++ b/src/Alpha_complex/doc/Intro_alpha_complex.h @@ -0,0 +1,176 @@ +/* This file is part of the Gudhi Library. The Gudhi library + * (Geometric Understanding in Higher Dimensions) is a generic C++ + * library for computational topology. + * + * Author(s): Vincent Rouvreau + * + * Copyright (C) 2015 INRIA + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef DOC_ALPHA_COMPLEX_INTRO_ALPHA_COMPLEX_H_ +#define DOC_ALPHA_COMPLEX_INTRO_ALPHA_COMPLEX_H_ + +// needs namespace for Doxygen to link on classes +namespace Gudhi { +// needs namespace for Doxygen to link on classes +namespace alpha_complex { + +/** \defgroup alpha_complex Alpha complex + * + * \author Vincent Rouvreau + * + * @{ + * + * \section definition Definition + * + * Alpha_complex is a <a target="_blank" href="https://en.wikipedia.org/wiki/Simplicial_complex">simplicial complex</a> + * constructed from the finite cells of a Delaunay Triangulation. + * + * The filtration value of each simplex is computed as the square of the circumradius of the simplex if the + * circumsphere is empty (the simplex is then said to be Gabriel), and as the minimum of the filtration + * values of the codimension 1 cofaces that make it not Gabriel otherwise. + * + * All simplices that have a filtration value strictly greater than a given alpha squared value are not inserted into + * the complex. + * + * \image html "alpha_complex_representation.png" "Alpha-complex representation" + * + * Alpha_complex is constructing a <a target="_blank" + * href="http://doc.cgal.org/latest/Triangulation/index.html#Chapter_Triangulations">Delaunay Triangulation</a> + * \cite cgal:hdj-t-15b from <a target="_blank" href="http://www.cgal.org/">CGAL</a> (the Computational Geometry + * Algorithms Library \cite cgal:eb-15b) and is able to create a `SimplicialComplexForAlpha`. + * + * The complex is a template class requiring an Epick_d <a target="_blank" + * href="http://doc.cgal.org/latest/Kernel_d/index.html#Chapter_dD_Geometry_Kernel">dD Geometry Kernel</a> + * \cite cgal:s-gkd-15b from CGAL as template parameter. + * + * \remark When the simplicial complex is constructed with an infinite value of alpha, the complex is a Delaunay + * complex. + * + * \section pointsexample Example from points + * + * This example builds the Delaunay triangulation from the given points in a 2D static kernel, and creates a + * `Simplex_tree` with it. + * + * Then, it is asked to display information about the simplicial complex. + * + * \include Alpha_complex/Alpha_complex_from_points.cpp + * + * When launching: + * + * \code $> ./alphapoints + * \endcode + * + * the program output is: + * + * \include Alpha_complex/alphaoffreader_for_doc_60.txt + * + * \section createcomplexalgorithm Create complex algorithm + * + * \subsection datastructure Data structure + * + * In order to create the simplicial complex, first, it is built from the cells of the Delaunay Triangulation. + * The filtration values are set to NaN, which stands for unknown value. + * + * In example, : + * \image html "alpha_complex_doc.png" "Simplicial complex structure construction example" + * + * \subsection filtrationcomputation Filtration value computation algorithm + * + * \f{algorithm}{ + * \caption{Filtration value computation algorithm}\label{alpha} + * \begin{algorithmic} + * \For{i : dimension $\rightarrow$ 0} + * \ForAll{$\sigma$ of dimension i} + * \If {filtration($\sigma$) is NaN} + * \State filtration($\sigma$) = $\alpha^2(\sigma)$ + * \EndIf + * \ForAll{$\tau$ face of $\sigma$} \Comment{propagate alpha filtration value} + * \If {filtration($\tau$) is not NaN} + * \State filtration($\tau$) = min (filtration($\tau$), filtration($\sigma$)) + * \Else + * \If {$\tau$ is not Gabriel for $\sigma$} + * \State filtration($\tau$) = filtration($\sigma$) + * \EndIf + * \EndIf + * \EndFor + * \EndFor + * \EndFor + * \State make\_filtration\_non\_decreasing() + * \State prune\_above\_filtration() + * \end{algorithmic} + * \f} + * + * \subsubsection dimension2 Dimension 2 + * + * From the example above, it means the algorithm looks into each triangle ([0,1,2], [0,2,4], [1,2,3], ...), + * computes the filtration value of the triangle, and then propagates the filtration value as described + * here : + * \image html "alpha_complex_doc_420.png" "Filtration value propagation example" + * + * \subsubsection dimension1 Dimension 1 + * + * Then, the algorithm looks into each edge ([0,1], [0,2], [1,2], ...), + * computes the filtration value of the edge (in this case, propagation will have no effect). + * + * \subsubsection dimension0 Dimension 0 + * + * Finally, the algorithm looks into each vertex ([0], [1], [2], [3], [4], [5] and [6]) and + * sets the filtration value (0 in case of a vertex - propagation will have no effect). + * + * \subsubsection nondecreasing Non decreasing filtration values + * + * As the squared radii computed by CGAL are an approximation, it might happen that these alpha squared values do not + * quite define a proper filtration (i.e. non-decreasing with respect to inclusion). + * We fix that up by calling `SimplicialComplexForAlpha::make_filtration_non_decreasing()`. + * + * \subsubsection pruneabove Prune above given filtration value + * + * The simplex tree is pruned from the given maximum alpha squared value (cf. + * `SimplicialComplexForAlpha::prune_above_filtration()`). + * In the following example, the value is given by the user as argument of the program. + * + * + * \section offexample Example from OFF file + * + * This example builds the Delaunay triangulation in a dynamic kernel, and initializes the alpha complex with it. + * + * + * Then, it is asked to display information about the alpha complex. + * + * \include Alpha_complex/Alpha_complex_from_off.cpp + * + * When launching: + * + * \code $> ./alphaoffreader ../../data/points/alphacomplexdoc.off 32.0 + * \endcode + * + * the program output is: + * + * \include Alpha_complex/alphaoffreader_for_doc_32.txt + * + * \copyright GNU General Public License v3. + * \verbatim Contact: gudhi-users@lists.gforge.inria.fr \endverbatim + */ +/** @} */ // end defgroup alpha_complex + +} // namespace alpha_complex + +namespace alphacomplex = alpha_complex; + +} // namespace Gudhi + +#endif // 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