- added random number generator to Core/Utils that generates a double between 0.0 and 1.0 with garantueed precision
- use this random number generator for the McDecimater under Windows, since RAND_MAX is not large enough git-svn-id: http://www.openmesh.org/svnrepo/OpenMesh/trunk@713 fdac6126-5c0c-442c-9429-916003d36597
This commit is contained in:
Isaak Lim
95
src/OpenMesh/Core/Utils/RandomNumberGenerator.cc
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95
src/OpenMesh/Core/Utils/RandomNumberGenerator.cc
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/*===========================================================================*\
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* *
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* OpenMesh *
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* Copyright (C) 2001-2011 by Computer Graphics Group, RWTH Aachen *
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* www.openmesh.org *
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* *
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*---------------------------------------------------------------------------*
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* This file is part of OpenMesh. *
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* *
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* OpenMesh is free software: you can redistribute it and/or modify *
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* it under the terms of the GNU Lesser General Public License as *
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* published by the Free Software Foundation, either version 3 of *
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* the License, or (at your option) any later version with the *
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* following exceptions: *
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* *
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* If other files instantiate templates or use macros *
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* or inline functions from this file, or you compile this file and *
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* link it with other files to produce an executable, this file does *
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* not by itself cause the resulting executable to be covered by the *
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* GNU Lesser General Public License. This exception does not however *
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* invalidate any other reasons why the executable file might be *
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* covered by the GNU Lesser General Public License. *
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* *
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* OpenMesh 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 Lesser General Public License for more details. *
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* *
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* You should have received a copy of the GNU LesserGeneral Public *
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* License along with OpenMesh. If not, *
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* see <http://www.gnu.org/licenses/>. *
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* *
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\*===========================================================================*/
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/*===========================================================================*\
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* *
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* $Revision: 362 $ *
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* $Date: 2011-01-26 10:21:12 +0100 (Mi, 26 Jan 2011) $ *
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* *
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\*===========================================================================*/
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//=============================================================================
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//
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// Helper Functions for generating a random number between 0.0 and 1.0 with
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// a garantueed resolution
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//
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//=============================================================================
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//== INCLUDES =================================================================
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#include <OpenMesh/Core/Utils/RandomNumberGenerator.hh>
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//== NAMESPACES ===============================================================
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namespace OpenMesh {
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//== IMPLEMENTATION ===========================================================
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RandomNumberGenerator::RandomNumberGenerator(const double _resolution) :
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resolution_(_resolution),
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iterations_(1),
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maxNum_(RAND_MAX)
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{
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double tmp = resolution_;
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while (tmp > (double(RAND_MAX) + 1) ) {
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iterations_++;
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tmp /= (double(RAND_MAX) + 1);
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}
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for ( unsigned int i = 0 ; i < iterations_ - 1; ++i ) {
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maxNum_ *= (RAND_MAX + 1);
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}
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}
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//-----------------------------------------------------------------------------
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double RandomNumberGenerator::getRand() const {
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double randNum = 0.0;
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for ( unsigned int i = 0 ; i < iterations_; ++i ) {
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randNum *= (RAND_MAX + 1);
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randNum += rand();
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}
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return randNum / maxNum_;
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}
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//=============================================================================
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} // namespace OpenMesh
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//=============================================================================
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103
src/OpenMesh/Core/Utils/RandomNumberGenerator.hh
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103
src/OpenMesh/Core/Utils/RandomNumberGenerator.hh
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@@ -0,0 +1,103 @@
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/*===========================================================================*\
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* *
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* OpenMesh *
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* Copyright (C) 2001-2011 by Computer Graphics Group, RWTH Aachen *
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* www.openmesh.org *
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* *
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*---------------------------------------------------------------------------*
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* This file is part of OpenMesh. *
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* *
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* OpenMesh is free software: you can redistribute it and/or modify *
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* it under the terms of the GNU Lesser General Public License as *
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* published by the Free Software Foundation, either version 3 of *
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* the License, or (at your option) any later version with the *
|
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* following exceptions: *
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* *
|
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* If other files instantiate templates or use macros *
|
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* or inline functions from this file, or you compile this file and *
|
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* link it with other files to produce an executable, this file does *
|
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* not by itself cause the resulting executable to be covered by the *
|
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* GNU Lesser General Public License. This exception does not however *
|
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* invalidate any other reasons why the executable file might be *
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* covered by the GNU Lesser General Public License. *
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* *
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* OpenMesh 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 Lesser General Public License for more details. *
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* *
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* You should have received a copy of the GNU LesserGeneral Public *
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* License along with OpenMesh. If not, *
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* see <http://www.gnu.org/licenses/>. *
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* *
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\*===========================================================================*/
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/*===========================================================================*\
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* *
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* $Revision: 693 $ *
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* $Date: 2012-09-23 16:25:16 +0200 (So, 23 Sep 2012) $ *
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* *
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\*===========================================================================*/
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//=============================================================================
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//
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// Helper Functions for generating a random number between 0.0 and 1.0 with
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// a garantueed resolution
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//
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//=============================================================================
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#ifndef OPENMESH_UTILS_RANDOMNUMBERGENERATOR_HH
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#define OPENMESH_UTILS_RANDOMNUMBERGENERATOR_HH
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//== INCLUDES =================================================================
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#include <OpenMesh/Core/System/config.h>
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#include <iostream>
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//== NAMESPACES ===============================================================
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namespace OpenMesh {
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//=============================================================================
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/** Generate a random number between 0.0 and 1.0 with a garantueed resolution
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*/
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class OPENMESHDLLEXPORT RandomNumberGenerator
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{
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public:
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/** \brief Constructor
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*
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* @param _resolution specifies the desired resolution for the random number generated
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*/
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RandomNumberGenerator(const double _resolution);
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/// returns a random double between 0.0 and 1.0 with a garantueed resolution
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double getRand() const;
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private:
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/// desired resolution
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const double resolution_;
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/// number of "blocks" of RAND_MAX that make up the desired _resolution
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unsigned int iterations_;
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/// maximum random number generated, which is used for normalization
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double maxNum_;
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};
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//=============================================================================
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} // namespace OpenMesh
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//=============================================================================
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#endif // OPENMESH_UTILS_RANDOMNUMBERGENERATOR_HH defined
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//=============================================================================
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