Repo created

3party/agg/agg_path_length.h

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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