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//----------------------------------------------------------------------------
// Anti-Grain Geometry - Version 2.3
// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
//
// Permission to copy, use, modify, sell and distribute this software
// is granted provided this copyright notice appears in all copies.
// This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
//
//----------------------------------------------------------------------------
// Contact: mcseem@antigrain.com
// mcseemagg@yahoo.com
// http://www.antigrain.com
//----------------------------------------------------------------------------
//
// Terminal markers generator (arrowhead/arrowtail)
//
//----------------------------------------------------------------------------
#include "agg_vcgen_markers_term.h"
namespace agg
{
//------------------------------------------------------------------------
void vcgen_markers_term::remove_all()
{
m_markers.remove_all();
}
//------------------------------------------------------------------------
void vcgen_markers_term::add_vertex(double x, double y, unsigned cmd)
{
if(is_move_to(cmd))
{
if(m_markers.size() & 1)
{
// Initial state, the first coordinate was added.
// If two of more calls of start_vertex() occures
// we just modify the last one.
m_markers.modify_last(coord_type(x, y));
}
else
{
m_markers.add(coord_type(x, y));
}
}
else
{
if(is_vertex(cmd))
{
if(m_markers.size() & 1)
{
// Initial state, the first coordinate was added.
// Add three more points, 0,1,1,0
m_markers.add(coord_type(x, y));
m_markers.add(m_markers[m_markers.size() - 1]);
m_markers.add(m_markers[m_markers.size() - 3]);
}
else
{
if(m_markers.size())
{
// Replace two last points: 0,1,1,0 -> 0,1,2,1
m_markers[m_markers.size() - 1] = m_markers[m_markers.size() - 2];
m_markers[m_markers.size() - 2] = coord_type(x, y);
}
}
}
}
}
//------------------------------------------------------------------------
void vcgen_markers_term::rewind(unsigned id)
{
m_curr_id = id * 2;
m_curr_idx = m_curr_id;
}
//------------------------------------------------------------------------
unsigned vcgen_markers_term::vertex(double* x, double* y)
{
if(m_curr_id > 2 || m_curr_idx >= m_markers.size())
{
return path_cmd_stop;
}
const coord_type& c = m_markers[m_curr_idx];
*x = c.x;
*y = c.y;
if(m_curr_idx & 1)
{
m_curr_idx += 3;
return path_cmd_line_to;
}
++m_curr_idx;
return path_cmd_move_to;
}
}
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