236 lines
6.9 KiB
C++
236 lines
6.9 KiB
C++
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//----------------------------------------------------------------------------
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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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// Line dash generator
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//
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//----------------------------------------------------------------------------
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#include <cmath>
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#include "agg_vcgen_dash.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_dash::vcgen_dash() :
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m_total_dash_len(0.0),
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m_num_dashes(0),
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m_dash_start(0.0),
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m_shorten(0.0),
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m_curr_dash_start(0.0),
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m_curr_dash(0),
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m_src_vertices(),
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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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{
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}
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//------------------------------------------------------------------------
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void vcgen_dash::remove_all_dashes()
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{
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m_total_dash_len = 0.0;
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m_num_dashes = 0;
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m_curr_dash_start = 0.0;
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m_curr_dash = 0;
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}
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//------------------------------------------------------------------------
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void vcgen_dash::add_dash(double dash_len, double gap_len)
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{
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if(m_num_dashes < max_dashes)
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{
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m_total_dash_len += dash_len + gap_len;
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m_dashes[m_num_dashes++] = dash_len;
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m_dashes[m_num_dashes++] = gap_len;
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}
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}
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//------------------------------------------------------------------------
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void vcgen_dash::dash_start(double ds)
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{
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m_dash_start = ds;
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calc_dash_start(std::fabs(ds));
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}
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//------------------------------------------------------------------------
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void vcgen_dash::calc_dash_start(double ds)
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{
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m_curr_dash = 0;
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m_curr_dash_start = 0.0;
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while(ds > 0.0)
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{
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if(ds > m_dashes[m_curr_dash])
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{
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ds -= m_dashes[m_curr_dash];
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++m_curr_dash;
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m_curr_dash_start = 0.0;
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if(m_curr_dash >= m_num_dashes) m_curr_dash = 0;
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}
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else
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{
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m_curr_dash_start = ds;
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ds = 0.0;
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}
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}
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}
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//------------------------------------------------------------------------
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void vcgen_dash::remove_all()
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{
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m_status = initial;
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m_src_vertices.remove_all();
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m_closed = 0;
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}
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//------------------------------------------------------------------------
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void vcgen_dash::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_dash::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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}
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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_dash::vertex(double* x, double* y)
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{
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unsigned cmd = path_cmd_move_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_num_dashes < 2 || m_src_vertices.size() < 2)
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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 = polyline;
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m_src_vertex = 1;
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m_v1 = &m_src_vertices[0];
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m_v2 = &m_src_vertices[1];
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m_curr_rest = m_v1->dist;
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*x = m_v1->x;
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*y = m_v1->y;
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if(m_dash_start >= 0.0) calc_dash_start(m_dash_start);
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return path_cmd_move_to;
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case polyline:
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{
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double dash_rest = m_dashes[m_curr_dash] - m_curr_dash_start;
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unsigned cmd = (m_curr_dash & 1) ?
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path_cmd_move_to :
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path_cmd_line_to;
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if(m_curr_rest > dash_rest)
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{
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m_curr_rest -= dash_rest;
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++m_curr_dash;
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if(m_curr_dash >= m_num_dashes) m_curr_dash = 0;
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m_curr_dash_start = 0.0;
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*x = m_v2->x - (m_v2->x - m_v1->x) * m_curr_rest / m_v1->dist;
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*y = m_v2->y - (m_v2->y - m_v1->y) * m_curr_rest / m_v1->dist;
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}
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else
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{
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m_curr_dash_start += m_curr_rest;
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*x = m_v2->x;
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*y = m_v2->y;
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++m_src_vertex;
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m_v1 = m_v2;
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m_curr_rest = m_v1->dist;
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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_status = stop;
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}
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else
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{
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m_v2 = &m_src_vertices
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[
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(m_src_vertex >= m_src_vertices.size()) ? 0 :
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m_src_vertex
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];
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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())
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{
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m_status = stop;
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}
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else
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{
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m_v2 = &m_src_vertices[m_src_vertex];
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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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break;
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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 path_cmd_stop;
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}
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}
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