ENH: added initial implementation for python GetPixel method

The python implementation of GetPixel does not contain a typed
suffix. Based on the PixelID of the image it chooses the correct
methods to call. Because the return type is not strongly typed the
methods will return the correct type to python.

Wrapping/Python.i

@@ -2,9 +2,18 @@
 // Make __str__ transparent by renaming ToString to __str__
 %rename(__str__) ToString;
 
+%rename( __GetPixelAsUInt8__ ) itk::simple::Image::GetPixelAsUInt8;
+%rename( __GetPixelAsInt16__ ) itk::simple::Image::GetPixelAsInt16;
+%rename( __GetPixelAsUInt16__ ) itk::simple::Image::GetPixelAsUInt16;
+%rename( __GetPixelAsInt32__ ) itk::simple::Image::GetPixelAsInt32;
+%rename( __GetPixelAsUInt32__ ) itk::simple::Image::GetPixelAsUInt32;
+%rename( __GetPixelAsFloat__ ) itk::simple::Image::GetPixelAsFloat;
+%rename( __GetPixelAsDouble__ ) itk::simple::Image::GetPixelAsDouble;
+
 
 %extend itk::simple::Image {
 
+
 //      def __floordiv__( other )
 //      def __pow__( double s )
 //      def __neg__( )
@@ -40,9 +49,53 @@
         def __xor__( self, other ): return Xor( self, other )
         def __invert__( self ): return Not( self )
 
-        %}
+        def GetPixel(self, x, y, z ):
+            pixelID = self.GetPixelIDValue()
+            if pixelID == sitkUnknown:
+               raise Exception("Logic Error: invalid pixel type")
+            if pixelID == sitkUInt8 || pixelID == sitkLabelUInt8:
+               return self.__GetPixelAsUInt8__( [ x, y, z ] )
+            if pixelID == sitkInt16:
+               return self.__GetPixelAsInt16__( [ x, y, z ] )
+            if pixelID == sitkUInt16 || pixelID == sitkLabelUInt16:
+               return self.__GetPixelAsUInt16__( [ x, y, z ] )
+            if pixelID == sitkInt32:
+               return self.__GetPixelAsInt32__( [ x, y, z ] )
+            if pixelID == sitkUInt32 || pixelID == sitkLabelUInt32:
+               return self.__GetPixelAsUInt32__( [ x, y, z ] )
+            if pixelID == sitkFloat32:
+               return self.__GetPixelAsFloat__( [ x, y, z ] )
+            if pixelID == sitkFloat64:
+               return self.__GetPixelAsDouble__( [ x, y, z ] )
+
+            raise Exception("Unknown pixel type")
+
+
+        def GetPixel(self, x, y):
+            pixelID = self.GetPixelIDValue()
+            if pixelID == sitkUnknown:
+               raise Exception("Logic Error: invalid pixel type")
+            if pixelID == sitkUInt8 || pixelID == sitkLabelUInt8:
+               return self.__GetPixelAsUInt8__( [ x, y ] )
+            if pixelID == sitkInt16:
+               return self.__GetPixelAsInt16__( [ x, y ] )
+            if pixelID == sitkUInt16 || pixelID == sitkLabelUInt16:
+               return self.__GetPixelAsUInt16__( [ x, y ] )
+            if pixelID == sitkInt32:
+               return self.__GetPixelAsInt32__( [ x, y ] )
+            if pixelID == sitkUInt32 || pixelID == sitkLabelUInt32:
+               return self.__GetPixelAsUInt32__( [ x, y ] )
+            if pixelID == sitkFloat32:
+               return self.__GetPixelAsFloat__( [ x, y ] )
+            if pixelID == sitkFloat64:
+               return self.__GetPixelAsDouble__( [ x, y ] )
+
+            raise Exception("Unknown pixel type")
+
+         %}
+
+
 
-
 };