157 lines
4.9 KiB
C++
157 lines
4.9 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_ADAPTOR_VCGEN_INCLUDED
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#define AGG_CONV_ADAPTOR_VCGEN_INCLUDED
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#include "agg_basics.h"
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namespace agg
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{
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//------------------------------------------------------------null_markers
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struct null_markers
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{
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void remove_all() {}
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void add_vertex(double, double, unsigned) {}
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void prepare_src() {}
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void rewind(unsigned) {}
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unsigned vertex(double*, double*) { return path_cmd_stop; }
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};
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//------------------------------------------------------conv_adaptor_vcgen
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template<class VertexSource,
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class Generator,
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class Markers=null_markers> class conv_adaptor_vcgen
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{
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enum status
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{
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initial,
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accumulate,
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generate
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};
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public:
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explicit conv_adaptor_vcgen(VertexSource& source) :
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m_source(&source),
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m_status(initial)
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{}
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void attach(VertexSource& source) { m_source = &source; }
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Generator& generator() { return m_generator; }
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const Generator& generator() const { return m_generator; }
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Markers& markers() { return m_markers; }
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const Markers& markers() const { return m_markers; }
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void rewind(unsigned path_id)
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{
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m_source->rewind(path_id);
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m_status = initial;
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}
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unsigned vertex(double* x, double* y);
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private:
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// Prohibit copying
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conv_adaptor_vcgen(const conv_adaptor_vcgen<VertexSource, Generator, Markers>&);
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const conv_adaptor_vcgen<VertexSource, Generator, Markers>&
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operator = (const conv_adaptor_vcgen<VertexSource, Generator, Markers>&);
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VertexSource* m_source;
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Generator m_generator;
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Markers m_markers;
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status m_status;
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unsigned m_last_cmd;
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double m_start_x;
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double m_start_y;
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};
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//------------------------------------------------------------------------
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template<class VertexSource, class Generator, class Markers>
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unsigned conv_adaptor_vcgen<VertexSource, Generator, Markers>::vertex(double* x, double* y)
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{
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unsigned cmd = path_cmd_stop;
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bool done = false;
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while(!done)
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{
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switch(m_status)
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{
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case initial:
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m_markers.remove_all();
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m_last_cmd = m_source->vertex(&m_start_x, &m_start_y);
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m_status = accumulate;
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case accumulate:
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if(is_stop(m_last_cmd)) return path_cmd_stop;
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m_generator.remove_all();
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m_generator.add_vertex(m_start_x, m_start_y, path_cmd_move_to);
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m_markers.add_vertex(m_start_x, m_start_y, path_cmd_move_to);
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for(;;)
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{
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cmd = m_source->vertex(x, y);
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if(is_vertex(cmd))
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{
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m_last_cmd = cmd;
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if(is_move_to(cmd))
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{
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m_start_x = *x;
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m_start_y = *y;
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break;
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}
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m_generator.add_vertex(*x, *y, cmd);
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m_markers.add_vertex(*x, *y, path_cmd_line_to);
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}
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else
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{
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if(is_stop(cmd))
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{
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m_last_cmd = path_cmd_stop;
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break;
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}
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if(is_end_poly(cmd))
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{
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m_generator.add_vertex(*x, *y, cmd);
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break;
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}
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}
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}
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m_generator.rewind(0);
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m_status = generate;
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case generate:
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cmd = m_generator.vertex(x, y);
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if(is_stop(cmd))
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{
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m_status = accumulate;
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break;
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}
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done = 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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