mapnik/src/arrow.cpp

/*****************************************************************************
 * 
 * This file is part of Mapnik (c++ mapping toolkit)
 *
 * Copyright (C) 2011 Artem Pavlenko
 *
 * This library 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 2.1 of the License, or (at your option) any later version.
 *
 * This library 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 this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *****************************************************************************/

//$Id$

#include <mapnik/arrow.hpp>

#include <agg_basics.h>

namespace mapnik {

arrow::arrow() 
    : pos_(0) 
{
    x_[0] = -7.0; y_[0] = 1.0; cmd_[0] = agg::path_cmd_move_to;
    x_[1] =  1.0; y_[1] = 1.0; cmd_[1] = agg::path_cmd_line_to;
    x_[2] =  1.0; y_[2] = 3.0; cmd_[2] = agg::path_cmd_line_to;
    x_[3] =  7.0; y_[3] = 0.0; cmd_[3] = agg::path_cmd_line_to;
    x_[4] =  1.0; y_[4] =-3.0; cmd_[4] = agg::path_cmd_line_to;
    x_[5] =  1.0; y_[5] =-1.0; cmd_[5] = agg::path_cmd_line_to;
    x_[6] = -7.0; y_[6] =-1.0; cmd_[6] = agg::path_cmd_line_to;
    cmd_[7] = agg::path_cmd_end_poly | agg::path_flags_close | agg::path_flags_ccw;
    cmd_[8] = agg::path_cmd_stop;
}

void arrow::rewind(unsigned )
{
    pos_ = 0;
}
    
unsigned arrow::vertex(double* x, double* y)
{
    if(pos_ < 7 )
    {
        *x = x_[pos_];
        *y = y_[pos_];
        return cmd_[pos_++];
    }
    return agg::path_cmd_stop;
}
   
box2d<double> arrow::extent() const
{
    return box2d<double>(-7,-3,7,3);
}
}