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diff --git a/pcbnew/scripting/units.i b/pcbnew/scripting/units.i
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+/*
+ * This program source code file is part of KiCad, a free EDA CAD application.
+ *
+ * Copyright (C) 2012 NBEE Embedded Systems, Miguel Angel Ajo <miguelangel@nbee.es>
+ * Copyright (C) 1992-2012 KiCad Developers, see AUTHORS.txt for contributors.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, you may find one here:
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ * or you may search the http://www.gnu.org website for the version 2 license,
+ * or you may write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+/**
+ * @file units.i
+ * @brief unit conversion code
+ */
+
+// Unit conversion, between internal units and mm or mils
+
+%pythoncode
+{
+   def ToMM(iu):
+      if type(iu) in [int,float]:
+         return float(iu) / float(IU_PER_MM)
+      elif type(iu) in [wxPoint,wxSize]:
+         return tuple(map(ToMM,iu))
+
+   def FromMM(mm):
+      if type(mm) in [int,float]:
+         return int(float(mm) * float(IU_PER_MM))
+      elif type(mm) in [wxPoint,wxSize]:
+        return tuple(map(FromMM,mm))
+
+   def ToMils(iu):
+      if type(iu) in [int,float]:
+        return float(iu) / float(IU_PER_MILS)
+      elif type(iu) in [wxPoint,wxSize]:
+        return tuple(map(ToMils,iu))
+
+   def FromMils(mils):
+      if type(mils) in [int,float]:
+         return int(float(mils)*float(IU_PER_MILS))
+      elif type(mils) in [wxPoint,wxSize]:
+        return tuple(map(FromMils,mils))
+
+   def wxSizeMM(mmx,mmy): return wxSize(FromMM(mmx),FromMM(mmy))
+   def wxSizeMils(mmx,mmy): return wxSize(FromMils(mmx),FromMils(mmy))
+
+   def wxPointMM(mmx,mmy): return wxPoint(FromMM(mmx),FromMM(mmy))
+   def wxPointMils(mmx,mmy): return wxPoint(FromMils(mmx),FromMils(mmy))
+
+   def wxRectMM(x,y,wx,wy):
+        x = int(FromMM(x))
+        y = int(FromMM(y))
+        wx = int(FromMM(wx))
+        wy = int (FromMM(wy))
+        return wxRect(x,y,wx,wy)
+
+   def wxRectMils(x,y,wx,wy):
+        x = int(FromMils(x))
+        y = int(FromMils(y))
+        wx = int(FromMils(wx))
+        wy = int (FromMils(wy))
+        return wxRect(x,y,wx,wy)
+
+}