I was using the physics::Joint::Position() function in Gazebo 9 to get the deflection of the child link from its initial position. Now I want to implement the same in Gazebo 7, but it doesn't have this function and I can't find anything in the [API documentation](http://osrf-distributions.s3.amazonaws.com/gazebo/api/7.1.0/classgazebo_1_1physics_1_1Joint.html), that looks like it does the same thing.
What can I use to get the deflection of the prismatic joint in Gazebo 7?
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