126 lines
3.5 KiB
C++
126 lines
3.5 KiB
C++
//----------------------------------------------------------------------------
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// Anti-Grain Geometry - Version 2.4
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// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
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//
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// Permission to copy, use, modify, sell and distribute this software
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// is granted provided this copyright notice appears in all copies.
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// This software is provided "as is" without express or implied
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// warranty, and with no claim as to its suitability for any purpose.
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//
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//----------------------------------------------------------------------------
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// Contact: mcseem@antigrain.com
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// mcseemagg@yahoo.com
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// http://www.antigrain.com
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//----------------------------------------------------------------------------
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#ifndef AGG_CONV_CLOSE_POLYGON_INCLUDED
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#define AGG_CONV_CLOSE_POLYGON_INCLUDED
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#include "agg_basics.h"
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namespace agg
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{
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//======================================================conv_close_polygon
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template<class VertexSource> class conv_close_polygon
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{
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public:
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explicit conv_close_polygon(VertexSource& vs) : m_source(&vs) {}
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void attach(VertexSource& source) { m_source = &source; }
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void rewind(unsigned path_id);
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unsigned vertex(double* x, double* y);
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private:
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conv_close_polygon(const conv_close_polygon<VertexSource>&);
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const conv_close_polygon<VertexSource>&
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operator = (const conv_close_polygon<VertexSource>&);
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VertexSource* m_source;
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unsigned m_cmd[2];
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double m_x[2];
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double m_y[2];
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unsigned m_vertex;
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bool m_line_to;
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};
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//------------------------------------------------------------------------
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template<class VertexSource>
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void conv_close_polygon<VertexSource>::rewind(unsigned path_id)
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{
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m_source->rewind(path_id);
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m_vertex = 2;
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m_line_to = false;
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}
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//------------------------------------------------------------------------
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template<class VertexSource>
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unsigned conv_close_polygon<VertexSource>::vertex(double* x, double* y)
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{
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unsigned cmd = path_cmd_stop;
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for(;;)
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{
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if(m_vertex < 2)
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{
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*x = m_x[m_vertex];
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*y = m_y[m_vertex];
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cmd = m_cmd[m_vertex];
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++m_vertex;
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break;
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}
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cmd = m_source->vertex(x, y);
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if(is_end_poly(cmd))
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{
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cmd |= path_flags_close;
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break;
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}
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if(is_stop(cmd))
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{
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if(m_line_to)
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{
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m_cmd[0] = path_cmd_end_poly | path_flags_close;
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m_cmd[1] = path_cmd_stop;
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m_vertex = 0;
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m_line_to = false;
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continue;
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}
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break;
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}
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if(is_move_to(cmd))
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{
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if(m_line_to)
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{
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m_x[0] = 0.0;
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m_y[0] = 0.0;
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m_cmd[0] = path_cmd_end_poly | path_flags_close;
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m_x[1] = *x;
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m_y[1] = *y;
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m_cmd[1] = cmd;
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m_vertex = 0;
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m_line_to = false;
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continue;
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}
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break;
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}
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if(is_vertex(cmd))
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{
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m_line_to = true;
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break;
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}
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}
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return cmd;
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}
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}
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#endif
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