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Diffstat (limited to 'third_party/agg23/agg_shorten_path.h')
| -rw-r--r-- | third_party/agg23/agg_shorten_path.h | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/third_party/agg23/agg_shorten_path.h b/third_party/agg23/agg_shorten_path.h new file mode 100644 index 0000000000..d7eb4be018 --- /dev/null +++ b/third_party/agg23/agg_shorten_path.h @@ -0,0 +1,57 @@ + +//---------------------------------------------------------------------------- +// 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 +//---------------------------------------------------------------------------- +#ifndef AGG_SHORTEN_PATH_INCLUDED +#define AGG_SHORTEN_PATH_INCLUDED +#include "agg_basics.h" +#include "agg_vertex_sequence.h" +namespace agg +{ +template<class VertexSequence> +void shorten_path(VertexSequence& vs, FX_FLOAT s, unsigned closed = 0) +{ + typedef typename VertexSequence::value_type vertex_type; + if(s > 0 && vs.size() > 1) { + FX_FLOAT d; + int n = int(vs.size() - 2); + while(n) { + d = vs[n].dist; + if(d > s) { + break; + } + vs.remove_last(); + s -= d; + --n; + } + if(vs.size() < 2) { + vs.remove_all(); + } else { + n = vs.size() - 1; + vertex_type& prev = vs[n - 1]; + vertex_type& last = vs[n]; + d = (prev.dist - s) / prev.dist; + FX_FLOAT x = prev.x + (last.x - prev.x) * d; + FX_FLOAT y = prev.y + (last.y - prev.y) * d; + last.x = x; + last.y = y; + if(!prev(last)) { + vs.remove_last(); + } + vs.close(closed != 0); + } + } +} +} +#endif |