Feature request

Hi,

Thanks for sharing this, the example worked a treat first time.  

If possible, could a range be set for the circles? For example:  -50 to 50 for the complete circle?

I've had a play with the maths and for the life of me can't seem to change the increments or range without killing path lines. 

It was only a suggestion and I understand a NO. :-)

Cheers

Arran