+/**
+* \ingroup Modules
+* Implementation of model widget for widget which provides input of a distance between two points
+* In XML file can be defined as following:
+* \code
+* <point2ddistance id="CircleRadius"
+* first_point="CircleCenter"
+* label="Radius:"
+* min="0"
+* step="1.0"
+* default="0"
+* icon=":icons/radius.png"
+* tooltip="Set radius">
+* <validator id="GeomValidators_Positive"/>
+* </point2ddistance>
+* \endcode
+*/