Attractor Point with Range

I received a request recently about using an attractor point in DP.  This was a famous early Grasshopper example so I figured I could do a simple version using DP.  The tutorial also includes a powercopied rule to set the range of the attractor point allowing for greater or lesser impact of the point on the circle radii.

Here is the text for a rule that gets powercopied with the geometry:

if buildgeo\radius_inner > radius_max 

{buildgeo\radius_float = radius_max }
else if buildgeo\radius_inner < radius_min 

{buildgeo\radius_float = radius_min }

else {buildgeo\radius_float = buildgeo\radius_inner }

Here is the file if anyone wants to work through the example (file here).  Click on the image below to start the video.