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75 lines
2.3 KiB
C++
75 lines
2.3 KiB
C++
//----------------------------------------------------------------------------
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// Anti-Grain Geometry (AGG) - Version 2.5
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// A high quality rendering engine for C++
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// Copyright (C) 2002-2006 Maxim Shemanarev
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// Contact: mcseem@antigrain.com
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// mcseemagg@yahoo.com
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// http://antigrain.com
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//
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// AGG is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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//
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// AGG is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with AGG; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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// MA 02110-1301, USA.
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//----------------------------------------------------------------------------
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#ifndef AGG_PATH_LENGTH_INCLUDED
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#define AGG_PATH_LENGTH_INCLUDED
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#include "agg_math.h"
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namespace agg
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{
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template<class VertexSource>
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double path_length(VertexSource& vs, unsigned path_id = 0)
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{
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double len = 0.0;
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double start_x = 0.0;
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double start_y = 0.0;
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double x1 = 0.0;
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double y1 = 0.0;
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double x2 = 0.0;
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double y2 = 0.0;
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bool first = true;
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unsigned cmd;
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vs.rewind(path_id);
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while(!is_stop(cmd = vs.vertex(&x2, &y2)))
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{
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if(is_vertex(cmd))
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{
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if(first || is_move_to(cmd))
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{
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start_x = x2;
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start_y = y2;
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}
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else
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{
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len += calc_distance(x1, y1, x2, y2);
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}
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x1 = x2;
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y1 = y2;
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first = false;
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}
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else
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{
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if(is_close(cmd) && !first)
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{
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len += calc_distance(x1, y1, start_x, start_y);
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}
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}
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}
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return len;
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}
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}
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#endif
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