I am looking for a package that can produce some basic geometric figures and can be incorporated in a pdf file in such a manner that it is interactive with the reader. More specifically, I want to draw a triangle ABC with its inner circle. And I want the points A,B,C to be "free" i.e. that the reader of the pdf file can change the position of A,B,C (and that the inner circle moves accordingly).
Is that even possible? If yes, what is the best/simplest option? Thank you a lot.