165 lines
5 KiB
C++
165 lines
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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//
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// Contour generator
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//
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//----------------------------------------------------------------------------
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#include <math.h>
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#include "agg_vcgen_contour.h"
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namespace agg
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{
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//------------------------------------------------------------------------
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vcgen_contour::vcgen_contour() :
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m_stroker(),
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m_width(1),
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m_src_vertices(),
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m_out_vertices(),
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m_status(initial),
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m_src_vertex(0),
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m_closed(0),
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m_orientation(0),
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m_auto_detect(false)
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{
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}
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//------------------------------------------------------------------------
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void vcgen_contour::remove_all()
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{
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m_src_vertices.remove_all();
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m_closed = 0;
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m_orientation = 0;
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m_status = initial;
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}
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//------------------------------------------------------------------------
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void vcgen_contour::add_vertex(double x, double y, unsigned cmd)
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{
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m_status = initial;
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if(is_move_to(cmd))
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{
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m_src_vertices.modify_last(vertex_dist(x, y));
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}
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else
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{
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if(is_vertex(cmd))
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{
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m_src_vertices.add(vertex_dist(x, y));
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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_closed = get_close_flag(cmd);
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if(m_orientation == path_flags_none)
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{
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m_orientation = get_orientation(cmd);
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}
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}
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}
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}
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}
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//------------------------------------------------------------------------
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void vcgen_contour::rewind(unsigned)
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{
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if(m_status == initial)
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{
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m_src_vertices.close(true);
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if(m_auto_detect)
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{
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if(!is_oriented(m_orientation))
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{
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m_orientation = (calc_polygon_area(m_src_vertices) > 0.0) ?
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path_flags_ccw :
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path_flags_cw;
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}
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}
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if(is_oriented(m_orientation))
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{
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m_stroker.width(is_ccw(m_orientation) ? m_width : -m_width);
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}
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}
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m_status = ready;
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m_src_vertex = 0;
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}
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//------------------------------------------------------------------------
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unsigned vcgen_contour::vertex(double* x, double* y)
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{
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unsigned cmd = path_cmd_line_to;
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while(!is_stop(cmd))
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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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rewind(0);
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case ready:
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if(m_src_vertices.size() < 2 + unsigned(m_closed != 0))
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{
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cmd = path_cmd_stop;
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break;
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}
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m_status = outline;
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cmd = path_cmd_move_to;
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m_src_vertex = 0;
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m_out_vertex = 0;
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case outline:
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if(m_src_vertex >= m_src_vertices.size())
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{
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m_status = end_poly;
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break;
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}
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m_stroker.calc_join(m_out_vertices,
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m_src_vertices.prev(m_src_vertex),
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m_src_vertices.curr(m_src_vertex),
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m_src_vertices.next(m_src_vertex),
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m_src_vertices.prev(m_src_vertex).dist,
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m_src_vertices.curr(m_src_vertex).dist);
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++m_src_vertex;
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m_status = out_vertices;
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m_out_vertex = 0;
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case out_vertices:
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if(m_out_vertex >= m_out_vertices.size())
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{
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m_status = outline;
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}
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else
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{
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const point_d& c = m_out_vertices[m_out_vertex++];
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*x = c.x;
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*y = c.y;
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return cmd;
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}
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break;
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case end_poly:
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if(!m_closed) return path_cmd_stop;
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m_status = stop;
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return path_cmd_end_poly | path_flags_close | path_flags_ccw;
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case stop:
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return path_cmd_stop;
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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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