/usr/include/mapnik/agg/agg_path_length.h is in libmapnik-dev 2.2.0+ds1-6build2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// Anti-Grain Geometry - Version 2.4
// 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_PATH_LENGTH_INCLUDED
#define AGG_PATH_LENGTH_INCLUDED
#include "agg_math.h"
namespace agg
{
template<class VertexSource>
double path_length(VertexSource& vs, unsigned path_id = 0)
{
double len = 0.0;
double start_x = 0.0;
double start_y = 0.0;
double x1 = 0.0;
double y1 = 0.0;
double x2 = 0.0;
double y2 = 0.0;
bool first = true;
unsigned cmd;
vs.rewind(path_id);
while(!is_stop(cmd = vs.vertex(&x2, &y2)))
{
if(is_vertex(cmd))
{
if(first || is_move_to(cmd))
{
start_x = x2;
start_y = y2;
}
else
{
len += calc_distance(x1, y1, x2, y2);
}
x1 = x2;
y1 = y2;
first = false;
}
else
{
if(is_close(cmd) && !first)
{
len += calc_distance(x1, y1, start_x, start_y);
}
}
}
return len;
}
}
#endif
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