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//----------------------------------------------------------------------------
// Anti-Grain Geometry - Version 2.2
// Copyright (C) 2002-2004 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
//----------------------------------------------------------------------------
#ifndef AGG_CONV_CLOSE_POLYGON_INCLUDED
#define AGG_CONV_CLOSE_POLYGON_INCLUDED
#include "agg_basics.h"
#include "agg_vertex_iterator.h"
namespace agg
{
//======================================================conv_close_polygon
template<class VertexSource> class conv_close_polygon
{
public:
conv_close_polygon(VertexSource& vs) : m_source(&vs) {}
void set_source(VertexSource& source) { m_source = &source; }
void rewind(unsigned path_id);
unsigned vertex(double* x, double* y);
typedef conv_close_polygon<VertexSource> source_type;
typedef vertex_iterator<source_type> iterator;
iterator begin(unsigned id) { return iterator(*this, id); }
iterator end() { return iterator(path_cmd_stop); }
private:
conv_close_polygon(const conv_close_polygon<VertexSource>&);
const conv_close_polygon<VertexSource>&
operator = (const conv_close_polygon<VertexSource>&);
VertexSource* m_source;
unsigned m_cmd[2];
double m_x[2];
double m_y[2];
unsigned m_vertex;
bool m_line_to;
};
//------------------------------------------------------------------------
template<class VertexSource>
void conv_close_polygon<VertexSource>::rewind(unsigned path_id)
{
m_source->rewind(path_id);
m_vertex = 2;
m_line_to = false;
}
//------------------------------------------------------------------------
template<class VertexSource>
unsigned conv_close_polygon<VertexSource>::vertex(double* x, double* y)
{
unsigned cmd = path_cmd_stop;
for(;;)
{
if(m_vertex < 2)
{
*x = m_x[m_vertex];
*y = m_y[m_vertex];
cmd = m_cmd[m_vertex];
++m_vertex;
break;
}
cmd = m_source->vertex(x, y);
if(is_end_poly(cmd))
{
cmd |= path_flags_close;
break;
}
if(is_stop(cmd))
{
if(m_line_to)
{
m_cmd[0] = path_cmd_end_poly | path_flags_close;
m_cmd[1] = path_cmd_stop;
m_vertex = 0;
m_line_to = false;
continue;
}
break;
}
if(is_move_to(cmd))
{
if(m_line_to)
{
m_x[0] = 0.0;
m_y[0] = 0.0;
m_cmd[0] = path_cmd_end_poly | path_flags_close;
m_x[1] = *x;
m_y[1] = *y;
m_cmd[1] = cmd;
m_vertex = 0;
m_line_to = false;
continue;
}
break;
}
if(is_vertex(cmd))
{
m_line_to = true;
break;
}
}
return cmd;
}
}
#endif
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