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diff --git a/contrib/python/matplotlib/py3/extern/agg24-svn/include/agg_arrowhead.h b/contrib/python/matplotlib/py3/extern/agg24-svn/include/agg_arrowhead.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
+//----------------------------------------------------------------------------
+//
+// Simple arrowhead/arrowtail generator 
+//
+//----------------------------------------------------------------------------
+#ifndef AGG_ARROWHEAD_INCLUDED
+#define AGG_ARROWHEAD_INCLUDED
+
+#include "agg_basics.h"
+
+namespace agg
+{
+
+    //===============================================================arrowhead
+    //
+    // See implementation agg_arrowhead.cpp 
+    //
+    class arrowhead
+    {
+    public:
+        arrowhead();
+
+        void head(double d1, double d2, double d3, double d4)
+        {
+            m_head_d1 = d1;
+            m_head_d2 = d2;
+            m_head_d3 = d3;
+            m_head_d4 = d4;
+            m_head_flag = true;
+        }
+
+        void head()    { m_head_flag = true; }
+        void no_head() { m_head_flag = false; }
+
+        void tail(double d1, double d2, double d3, double d4)
+        {
+            m_tail_d1 = d1;
+            m_tail_d2 = d2;
+            m_tail_d3 = d3;
+            m_tail_d4 = d4;
+            m_tail_flag = true;
+        }
+
+        void tail()    { m_tail_flag = true;  }
+        void no_tail() { m_tail_flag = false; }
+
+        void rewind(unsigned path_id);
+        unsigned vertex(double* x, double* y);
+
+    private:
+        double   m_head_d1;
+        double   m_head_d2;
+        double   m_head_d3;
+        double   m_head_d4;
+        double   m_tail_d1;
+        double   m_tail_d2;
+        double   m_tail_d3;
+        double   m_tail_d4;
+        bool     m_head_flag;
+        bool     m_tail_flag;
+        double   m_coord[16];
+        unsigned m_cmd[8];
+        unsigned m_curr_id;
+        unsigned m_curr_coord;
+    };
+
+}
+
+#endif