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/* ============================================================
*
* This file is a part of digiKam project
* http://www.digikam.org
*
* Date : 2005-01-18
* Description : triangle geometry calculation class.
*
* Copyright (C) 2005-2007 by Gilles Caulier <caulier dot gilles at gmail dot com>
*
* 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 2, 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.
*
* ============================================================ */
// C++ includes.
#include <cstdio>
#include <cstdlib>
#include <cmath>
// Local includes.
#include "triangle.h"
namespace DigikamPerspectiveImagesPlugin
{
Triangle::Triangle(TQPoint A, TQPoint B, TQPoint C)
{
m_a = distanceP2P(B, C);
m_b = distanceP2P(A, C);
m_c = distanceP2P(A, B);
}
float Triangle::angleABC(void)
{
return( 57.295779513082 * acos( (m_b*m_b - m_a*m_a - m_c*m_c ) / (-2*m_a*m_c ) ) );
}
float Triangle::angleACB(void)
{
return( 57.295779513082 * acos( (m_c*m_c - m_a*m_a - m_b*m_b ) / (-2*m_a*m_b ) ) );
}
float Triangle::angleBAC(void)
{
return( 57.295779513082 * acos( (m_a*m_a - m_b*m_b - m_c*m_c ) / (-2*m_b*m_c ) ) );
}
float Triangle::distanceP2P(const TQPoint& p1, const TQPoint& p2)
{
return(sqrt( abs( p2.x()-p1.x() ) * abs( p2.x()-p1.x() ) +
abs( p2.y()-p1.y() ) * abs( p2.y()-p1.y() ) ));
}
} // NameSpace DigikamPerspectiveImagesPlugin
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