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212 lines
6.8 KiB
212 lines
6.8 KiB
//---------------------------------------------------------------------------- |
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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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// Stroke generator |
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// |
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//---------------------------------------------------------------------------- |
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#include "agg_vcgen_stroke.h" |
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#include "agg_shorten_path.h" |
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namespace agg |
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{ |
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//------------------------------------------------------------------------ |
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vcgen_stroke::vcgen_stroke() : |
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m_stroker(), |
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m_src_vertices(), |
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m_out_vertices(), |
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m_shorten(0.0), |
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m_closed(0), |
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m_status(initial), |
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m_src_vertex(0), |
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m_out_vertex(0) |
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{ |
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} |
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//------------------------------------------------------------------------ |
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void vcgen_stroke::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_status = initial; |
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} |
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//------------------------------------------------------------------------ |
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void vcgen_stroke::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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m_closed = get_close_flag(cmd); |
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} |
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} |
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} |
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//------------------------------------------------------------------------ |
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void vcgen_stroke::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(m_closed != 0); |
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shorten_path(m_src_vertices, m_shorten, m_closed); |
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if(m_src_vertices.size() < 3) m_closed = 0; |
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} |
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m_status = ready; |
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m_src_vertex = 0; |
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m_out_vertex = 0; |
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} |
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//------------------------------------------------------------------------ |
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unsigned vcgen_stroke::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 = m_closed ? outline1 : cap1; |
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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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break; |
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case cap1: |
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m_stroker.calc_cap(m_out_vertices, |
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m_src_vertices[0], |
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m_src_vertices[1], |
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m_src_vertices[0].dist); |
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m_src_vertex = 1; |
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m_prev_status = outline1; |
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m_status = out_vertices; |
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m_out_vertex = 0; |
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break; |
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case cap2: |
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m_stroker.calc_cap(m_out_vertices, |
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m_src_vertices[m_src_vertices.size() - 1], |
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m_src_vertices[m_src_vertices.size() - 2], |
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m_src_vertices[m_src_vertices.size() - 2].dist); |
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m_prev_status = outline2; |
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m_status = out_vertices; |
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m_out_vertex = 0; |
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break; |
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case outline1: |
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if(m_closed) |
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{ |
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if(m_src_vertex >= m_src_vertices.size()) |
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{ |
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m_prev_status = close_first; |
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m_status = end_poly1; |
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break; |
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} |
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} |
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else |
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{ |
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if(m_src_vertex >= m_src_vertices.size() - 1) |
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{ |
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m_status = cap2; |
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break; |
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} |
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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_prev_status = m_status; |
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m_status = out_vertices; |
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m_out_vertex = 0; |
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break; |
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case close_first: |
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m_status = outline2; |
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cmd = path_cmd_move_to; |
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case outline2: |
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if(m_src_vertex <= unsigned(m_closed == 0)) |
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{ |
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m_status = end_poly2; |
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m_prev_status = stop; |
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break; |
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} |
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--m_src_vertex; |
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m_stroker.calc_join(m_out_vertices, |
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m_src_vertices.next(m_src_vertex), |
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m_src_vertices.curr(m_src_vertex), |
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m_src_vertices.prev(m_src_vertex), |
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m_src_vertices.curr(m_src_vertex).dist, |
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m_src_vertices.prev(m_src_vertex).dist); |
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m_prev_status = m_status; |
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m_status = out_vertices; |
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m_out_vertex = 0; |
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break; |
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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 = m_prev_status; |
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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_poly1: |
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m_status = m_prev_status; |
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return path_cmd_end_poly | path_flags_close | path_flags_ccw; |
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case end_poly2: |
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m_status = m_prev_status; |
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return path_cmd_end_poly | path_flags_close | path_flags_cw; |
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case stop: |
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cmd = path_cmd_stop; |
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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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