246 lines
8 KiB
C++
Executable file
246 lines
8 KiB
C++
Executable file
//----------------------------------------------------------------------------
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// Anti-Grain Geometry - Version 2.3
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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 <math.h>
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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_src_vertices(),
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m_out_vertices(),
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m_width(0.5),
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m_miter_limit(4.0),
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m_inner_miter_limit(1.0 + 1.0/64.0),
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m_approx_scale(1.0),
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m_shorten(0.0),
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m_line_cap(butt_cap),
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m_line_join(miter_join),
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m_inner_line_join(miter_join_revert),
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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::miter_limit_theta(double t)
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{
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m_miter_limit = 1.0 / sin(t * 0.5) ;
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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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stroke_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_line_cap,
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m_width,
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m_approx_scale);
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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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stroke_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_line_cap,
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m_width,
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m_approx_scale);
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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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stroke_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_width,
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m_line_join,
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m_inner_line_join,
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m_miter_limit,
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m_inner_miter_limit,
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m_approx_scale);
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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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stroke_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_width,
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m_line_join,
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m_inner_line_join,
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m_miter_limit,
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m_inner_miter_limit,
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m_approx_scale);
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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_type& 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 (unsigned)path_cmd_end_poly | (unsigned)path_flags_close | (unsigned)path_flags_ccw;
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case end_poly2:
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m_status = m_prev_status;
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return (unsigned)path_cmd_end_poly | (unsigned)path_flags_close | (unsigned)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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