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aka_geometry.cc
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aka_geometry.cc
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/**
* @file aka_geometry.cc
* @author Alejandro M. Aragón <alejandro.aragon@epfl.ch>
* @date Tue Oct 23 10:35:00 2012
*
* @brief geometric operations
*
* @section LICENSE
*
* Copyright (©) 2010-2011 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* Akantu 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 3 of the License, or (at your option) any
* later version.
*
* Akantu 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 Akantu. If not, see <http://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#include "aka_geometry.hh"
__BEGIN_AKANTU__
/*! \param p - A constant reference to the first point that defines the line segment.
* \param q - A constant reference to the second point that defines the line segment.
* \param r - A constant reference to the point for which the predicate is computed.
* \return A double, being -1.0 if the point lines on one side of the line and 1.0 if it lies
* on the other side.
*/
Real left_turn(const Point<2>& p, const Point<2>& q, const Point<2>& r) {
if((q[0]-p[0]) * (r[1]-p[1]) > (r[0]-p[0]) * (q[1]-p[1]) )
return Real(1.0);
else
return Real(-1.0);
}
__END_AKANTU__

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