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Diffstat (limited to 'agg/source/agg_vcgen_dash.cpp')
| -rwxr-xr-x | agg/source/agg_vcgen_dash.cpp | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/agg/source/agg_vcgen_dash.cpp b/agg/source/agg_vcgen_dash.cpp new file mode 100755 index 000000000000..96783abe9952 --- /dev/null +++ b/agg/source/agg_vcgen_dash.cpp @@ -0,0 +1,237 @@ +//---------------------------------------------------------------------------- +// Anti-Grain Geometry - Version 2.3 +// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com) +// +// Permission to copy, use, modify, sell and distribute this software +// is granted provided this copyright notice appears in all copies. +// This software is provided "as is" without express or implied +// warranty, and with no claim as to its suitability for any purpose. +// +//---------------------------------------------------------------------------- +// Contact: mcseem@antigrain.com +// mcseemagg@yahoo.com +// http://www.antigrain.com +//---------------------------------------------------------------------------- +// +// Line dash generator +// +//---------------------------------------------------------------------------- + +#include <math.h> +#include "agg_vcgen_dash.h" +#include "agg_shorten_path.h" + +namespace agg +{ + + //------------------------------------------------------------------------ + vcgen_dash::vcgen_dash() : + m_total_dash_len(0.0), + m_num_dashes(0), + m_dash_start(0.0), + m_shorten(0.0), + m_curr_dash_start(0.0), + m_curr_dash(0), + m_src_vertices(), + m_closed(0), + m_status(initial), + m_src_vertex(0) + { + } + + + + //------------------------------------------------------------------------ + void vcgen_dash::remove_all_dashes() + { + m_total_dash_len = 0.0; + m_num_dashes = 0; + m_curr_dash_start = 0.0; + m_curr_dash = 0; + } + + + //------------------------------------------------------------------------ + void vcgen_dash::add_dash(double dash_len, double gap_len) + { + if(m_num_dashes < max_dashes) + { + m_total_dash_len += dash_len + gap_len; + m_dashes[m_num_dashes++] = dash_len; + m_dashes[m_num_dashes++] = gap_len; + } + } + + + //------------------------------------------------------------------------ + void vcgen_dash::dash_start(double ds) + { + m_dash_start = ds; + calc_dash_start(fabs(ds)); + } + + + //------------------------------------------------------------------------ + void vcgen_dash::calc_dash_start(double ds) + { + m_curr_dash = 0; + m_curr_dash_start = 0.0; + while(ds > 0.0) + { + if(ds > m_dashes[m_curr_dash]) + { + ds -= m_dashes[m_curr_dash]; + ++m_curr_dash; + m_curr_dash_start = 0.0; + if(m_curr_dash >= m_num_dashes) m_curr_dash = 0; + } + else + { + m_curr_dash_start = ds; + ds = 0.0; + } + } + } + + + //------------------------------------------------------------------------ + void vcgen_dash::remove_all() + { + m_status = initial; + m_src_vertices.remove_all(); + m_closed = 0; + } + + + //------------------------------------------------------------------------ + void vcgen_dash::add_vertex(double x, double y, unsigned cmd) + { + m_status = initial; + if(is_move_to(cmd)) + { + m_src_vertices.modify_last(vertex_dist(x, y)); + } + else + { + if(is_vertex(cmd)) + { + m_src_vertices.add(vertex_dist(x, y)); + } + else + { + m_closed = get_close_flag(cmd); + } + } + } + + + //------------------------------------------------------------------------ + void vcgen_dash::rewind(unsigned) + { + if(m_status == initial) + { + m_src_vertices.close(m_closed != 0); + shorten_path(m_src_vertices, m_shorten, m_closed); + } + m_status = ready; + m_src_vertex = 0; + } + + + //------------------------------------------------------------------------ + unsigned vcgen_dash::vertex(double* x, double* y) + { + unsigned cmd = path_cmd_move_to; + while(!is_stop(cmd)) + { + switch(m_status) + { + case initial: + rewind(0); + + case ready: + if(m_num_dashes < 2 || m_src_vertices.size() < 2) + { + cmd = path_cmd_stop; + break; + } + m_status = polyline; + m_src_vertex = 1; + m_v1 = &m_src_vertices[0]; + m_v2 = &m_src_vertices[1]; + m_curr_rest = m_v1->dist; + *x = m_v1->x; + *y = m_v1->y; + if(m_dash_start >= 0.0) calc_dash_start(m_dash_start); + return path_cmd_move_to; + + case polyline: + { + double dash_rest = m_dashes[m_curr_dash] - m_curr_dash_start; + + unsigned _cmd = (m_curr_dash & 1) ? + path_cmd_move_to : + path_cmd_line_to; + + if(m_curr_rest > dash_rest) + { + m_curr_rest -= dash_rest; + ++m_curr_dash; + if(m_curr_dash >= m_num_dashes) m_curr_dash = 0; + m_curr_dash_start = 0.0; + *x = m_v2->x - (m_v2->x - m_v1->x) * m_curr_rest / m_v1->dist; + *y = m_v2->y - (m_v2->y - m_v1->y) * m_curr_rest / m_v1->dist; + } + else + { + m_curr_dash_start += m_curr_rest; + *x = m_v2->x; + *y = m_v2->y; + ++m_src_vertex; + m_v1 = m_v2; + m_curr_rest = m_v1->dist; + if(m_closed) + { + if(m_src_vertex > m_src_vertices.size()) + { + m_status = stop; + } + else + { + m_v2 = &m_src_vertices + [ + (m_src_vertex >= m_src_vertices.size()) ? 0 : + m_src_vertex + ]; + } + } + else + { + if(m_src_vertex >= m_src_vertices.size()) + { + m_status = stop; + } + else + { + m_v2 = &m_src_vertices[m_src_vertex]; + } + } + } + return _cmd; + } + + // statement unreachable + //break; + + case stop: + cmd = path_cmd_stop; + break; + } + + } + return path_cmd_stop; + } + + +} + |