/* ============================================================
 *
 * 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
