Draw circle around cursor when getting a point

Hi! I came across this page the other day and decided to write my own version. I’m particularly stomped by this custom display:

Looks like it’s displaying a circle projected onto a targeted surface before GetPoint() is executed.

I’m fairly green to Rhino Common (even greener when it comes to custom displays) and I’d like to know where I should start looking (which namespace / method / etc to use). It would also be great if anyone can point me to a similar problem in this forum. Thanks.

You would need to use the GetPoint class, and implement something in its DynamicDraw event handler, see

Some examples

Thank you! I’ll take a look