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235 lines
6.9 KiB
235 lines
6.9 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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// 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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