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134 lines
4 KiB
C++
134 lines
4 KiB
C++
//----------------------------------------------------------------------------
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// Anti-Grain Geometry (AGG) - Version 2.5
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// A high quality rendering engine for C++
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// Copyright (C) 2002-2006 Maxim Shemanarev
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// Contact: mcseem@antigrain.com
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// mcseemagg@yahoo.com
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// http://antigrain.com
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//
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// AGG is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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//
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// AGG is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with AGG; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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// MA 02110-1301, USA.
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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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