Desktop/sourceforge/geometria/src/kernel/lines_meet_algorithm.cpp

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/*
This file is part of geometria.

geometria 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 of the License, 
or (at your option) any later version.

geometria 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 geometria; if not, write to the Free Software 
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA

(c) Philipp Moritz, 2006
*/

#include "lines_meet_algorithm.hpp"

lines_meet_algorithm::lines_meet_algorithm(boost::shared_ptr<geo_line> l, boost::shared_ptr<geo_line> m)
: m_l(l), m_m(m)
{
        m_l->register_observer(this);
        m_m->register_observer(this);
}

lines_meet_algorithm::~lines_meet_algorithm(void)
{
        m_l->unregister_observer(this);
        m_m->unregister_observer(this);
}


point lines_meet_algorithm::calculate()
{
        double m_1 = m_l->get_line().get_m();
        double t_1 = m_l->get_line().get_t();

        double m_2 = m_m->get_line().get_m();
        double t_2 = m_m->get_line().get_t();

        double x = (t_2 - t_1)/(m_1 - m_2);
        double y = (m_1*t_2 - t_1*m_2)/(m_1 - m_2);
        return point(x, y);
}

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