diff options
Diffstat (limited to 'agg/source/agg_vcgen_markers_term.cpp')
-rwxr-xr-x | agg/source/agg_vcgen_markers_term.cpp | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/agg/source/agg_vcgen_markers_term.cpp b/agg/source/agg_vcgen_markers_term.cpp new file mode 100755 index 000000000000..0daa40793764 --- /dev/null +++ b/agg/source/agg_vcgen_markers_term.cpp @@ -0,0 +1,103 @@ +//---------------------------------------------------------------------------- +// 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 +//---------------------------------------------------------------------------- +// +// Terminal markers generator (arrowhead/arrowtail) +// +//---------------------------------------------------------------------------- + +#include "agg_vcgen_markers_term.h" + +namespace agg +{ + + //------------------------------------------------------------------------ + void vcgen_markers_term::remove_all() + { + m_markers.remove_all(); + } + + + //------------------------------------------------------------------------ + void vcgen_markers_term::add_vertex(double x, double y, unsigned cmd) + { + if(is_move_to(cmd)) + { + if(m_markers.size() & 1) + { + // Initial state, the first coordinate was added. + // If two of more calls of start_vertex() occures + // we just modify the last one. + m_markers.modify_last(coord_type(x, y)); + } + else + { + m_markers.add(coord_type(x, y)); + } + } + else + { + if(is_vertex(cmd)) + { + if(m_markers.size() & 1) + { + // Initial state, the first coordinate was added. + // Add three more points, 0,1,1,0 + m_markers.add(coord_type(x, y)); + m_markers.add(m_markers[m_markers.size() - 1]); + m_markers.add(m_markers[m_markers.size() - 3]); + } + else + { + if(m_markers.size()) + { + // Replace two last points: 0,1,1,0 -> 0,1,2,1 + m_markers[m_markers.size() - 1] = m_markers[m_markers.size() - 2]; + m_markers[m_markers.size() - 2] = coord_type(x, y); + } + } + } + } + } + + + //------------------------------------------------------------------------ + void vcgen_markers_term::rewind(unsigned id) + { + m_curr_id = id * 2; + m_curr_idx = m_curr_id; + } + + + //------------------------------------------------------------------------ + unsigned vcgen_markers_term::vertex(double* x, double* y) + { + if(m_curr_id > 2 || m_curr_idx >= m_markers.size()) + { + return path_cmd_stop; + } + const coord_type& c = m_markers[m_curr_idx]; + *x = c.x; + *y = c.y; + if(m_curr_idx & 1) + { + m_curr_idx += 3; + return path_cmd_line_to; + } + ++m_curr_idx; + return path_cmd_move_to; + } + + +} |