1 files changed, 110 insertions, 0 deletions
diff --git a/agg/source/agg_arrowhead.cpp b/agg/source/agg_arrowhead.cpp
new file mode 100755
index 000000000000..694ed5ad887b
--- /dev/null
+++ b/agg/source/agg_arrowhead.cpp
@@ -0,0 +1,110 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.3
+// 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
+//
+//----------------------------------------------------------------------------
+
+#include "agg_arrowhead.h"
+
+namespace agg
+{
+
+    //------------------------------------------------------------------------
+    arrowhead::arrowhead() :
+        m_head_d1(1.0),
+        m_head_d2(1.0),
+        m_head_d3(1.0),
+        m_head_d4(0.0),
+        m_tail_d1(1.0),
+        m_tail_d2(1.0),
+        m_tail_d3(1.0),
+        m_tail_d4(0.0),
+        m_head_flag(false),
+        m_tail_flag(false),
+        m_curr_id(0),
+        m_curr_coord(0)
+    {
+    }
+
+
+
+    //------------------------------------------------------------------------
+    void arrowhead::rewind(unsigned id)
+    {
+        m_curr_id = id;
+        m_curr_coord = 0;
+        if(id == 0)
+        {
+            if(!m_tail_flag)
+            {
+                m_cmd[0] = path_cmd_stop;
+                return;
+            }
+            m_coord[0]  =  m_tail_d1;             m_coord[1]  =  0.0;
+            m_coord[2]  =  m_tail_d1 - m_tail_d4; m_coord[3]  =  m_tail_d3;
+            m_coord[4]  = -m_tail_d2 - m_tail_d4; m_coord[5]  =  m_tail_d3;
+            m_coord[6]  = -m_tail_d2;             m_coord[7]  =  0.0;
+            m_coord[8]  = -m_tail_d2 - m_tail_d4; m_coord[9]  = -m_tail_d3;
+            m_coord[10] =  m_tail_d1 - m_tail_d4; m_coord[11] = -m_tail_d3;
+
+            m_cmd[0] = path_cmd_move_to;
+            m_cmd[1] = path_cmd_line_to;
+            m_cmd[2] = path_cmd_line_to;
+            m_cmd[3] = path_cmd_line_to;
+            m_cmd[4] = path_cmd_line_to;
+            m_cmd[5] = path_cmd_line_to;
+            m_cmd[7] = (unsigned)path_cmd_end_poly | (unsigned)path_flags_close | (unsigned)path_flags_ccw;
+            m_cmd[6] = path_cmd_stop;
+            return;
+        }
+
+        if(id == 1)
+        {
+            if(!m_head_flag)
+            {
+                m_cmd[0] = path_cmd_stop;
+                return;
+            }
+            m_coord[0]  = -m_head_d1;            m_coord[1]  = 0.0;
+            m_coord[2]  = m_head_d2 + m_head_d4; m_coord[3]  = -m_head_d3;
+            m_coord[4]  = m_head_d2;             m_coord[5]  = 0.0;
+            m_coord[6]  = m_head_d2 + m_head_d4; m_coord[7]  = m_head_d3;
+
+            m_cmd[0] = path_cmd_move_to;
+            m_cmd[1] = path_cmd_line_to;
+            m_cmd[2] = path_cmd_line_to;
+            m_cmd[3] = path_cmd_line_to;
+            m_cmd[4] = (unsigned)path_cmd_end_poly | (unsigned)path_flags_close | (unsigned)path_flags_ccw;
+            m_cmd[5] = path_cmd_stop;
+            return;
+        }
+    }
+
+
+    //------------------------------------------------------------------------
+    unsigned arrowhead::vertex(double* x, double* y)
+    {
+        if(m_curr_id < 2)
+        {
+            unsigned curr_idx = m_curr_coord * 2;
+            *x = m_coord[curr_idx];
+            *y = m_coord[curr_idx + 1];
+            return m_cmd[m_curr_coord++];
+        }
+        return path_cmd_stop;
+    }
+
+}