//---------------------------------------------------------------------------- // Anti-Grain Geometry (AGG) - Version 2.5 // A high quality rendering engine for C++ // Copyright (C) 2002-2006 Maxim Shemanarev // Contact: mcseem@antigrain.com // mcseemagg@yahoo.com // http://antigrain.com // // AGG is free software; you can redistribute it and/or // modify it under the terms of the GNU General Public License // as published by the Free Software Foundation; either version 2 // of the License, or (at your option) any later version. // // AGG is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // You should have received a copy of the GNU General Public License // along with AGG; if not, write to the Free Software // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, // MA 02110-1301, USA. //---------------------------------------------------------------------------- #ifndef AGG_SHORTEN_PATH_INCLUDED #define AGG_SHORTEN_PATH_INCLUDED #include "agg_basics.h" #include "agg_vertex_sequence.h" namespace agg { //===========================================================shorten_path template<class VertexSequence> void shorten_path(VertexSequence& vs, double s, unsigned closed = 0) { typedef typename VertexSequence::value_type vertex_type; if(s > 0.0 && vs.size() > 1) { double 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; double x = prev.x + (last.x - prev.x) * d; double 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 |