160 lines
4.9 KiB
C++
160 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_VPGEN_INCLUDED
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#define AGG_CONV_ADAPTOR_VPGEN_INCLUDED
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#include "agg_basics.h"
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namespace agg
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{
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//======================================================conv_adaptor_vpgen
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template<class VertexSource, class VPGen> class conv_adaptor_vpgen
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{
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public:
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explicit conv_adaptor_vpgen(VertexSource& source) : m_source(&source) {}
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void attach(VertexSource& source) { m_source = &source; }
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VPGen& vpgen() { return m_vpgen; }
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const VPGen& vpgen() const { return m_vpgen; }
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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_adaptor_vpgen(const conv_adaptor_vpgen<VertexSource, VPGen>&);
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const conv_adaptor_vpgen<VertexSource, VPGen>&
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operator = (const conv_adaptor_vpgen<VertexSource, VPGen>&);
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VertexSource* m_source;
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VPGen m_vpgen;
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double m_start_x;
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double m_start_y;
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unsigned m_poly_flags;
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int m_vertices;
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};
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//------------------------------------------------------------------------
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template<class VertexSource, class VPGen>
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void conv_adaptor_vpgen<VertexSource, VPGen>::rewind(unsigned path_id)
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{
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m_source->rewind(path_id);
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m_vpgen.reset();
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m_start_x = 0;
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m_start_y = 0;
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m_poly_flags = 0;
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m_vertices = 0;
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}
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//------------------------------------------------------------------------
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template<class VertexSource, class VPGen>
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unsigned conv_adaptor_vpgen<VertexSource, VPGen>::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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cmd = m_vpgen.vertex(x, y);
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if(!is_stop(cmd)) break;
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if(m_poly_flags && !m_vpgen.auto_unclose())
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{
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*x = 0.0;
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*y = 0.0;
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cmd = m_poly_flags;
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m_poly_flags = 0;
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break;
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}
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if(m_vertices < 0)
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{
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if(m_vertices < -1)
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{
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m_vertices = 0;
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return path_cmd_stop;
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}
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m_vpgen.move_to(m_start_x, m_start_y);
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m_vertices = 1;
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continue;
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}
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double tx, ty;
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cmd = m_source->vertex(&tx, &ty);
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if(is_vertex(cmd))
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{
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if(is_move_to(cmd))
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{
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if(m_vpgen.auto_close() && m_vertices > 2)
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{
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m_vpgen.line_to(m_start_x, m_start_y);
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m_poly_flags = path_cmd_end_poly | path_flags_close;
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m_start_x = tx;
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m_start_y = ty;
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m_vertices = -1;
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continue;
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}
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m_vpgen.move_to(tx, ty);
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m_start_x = tx;
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m_start_y = ty;
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m_vertices = 1;
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}
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else
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{
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m_vpgen.line_to(tx, ty);
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++m_vertices;
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}
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}
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else
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{
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if(is_end_poly(cmd))
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{
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m_poly_flags = cmd;
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if(is_closed(cmd) || m_vpgen.auto_close())
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{
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if(m_vpgen.auto_close()) m_poly_flags |= path_flags_close;
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if(m_vertices > 2)
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{
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m_vpgen.line_to(m_start_x, m_start_y);
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}
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m_vertices = 0;
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}
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}
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else
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{
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// path_cmd_stop
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if(m_vpgen.auto_close() && m_vertices > 2)
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{
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m_vpgen.line_to(m_start_x, m_start_y);
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m_poly_flags = path_cmd_end_poly | path_flags_close;
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m_vertices = -2;
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continue;
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}
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break;
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}
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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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