This is a simple DrawCircle app written by me, Benjamin Zagorski, using HTML5 Canvas. I wrote it without any given circle functions, meaning I am only using software that knows how to make one point at a time. This challenge was given by a friend of mine, and after completing it I felt like presenting it in such a way that the user can play around with it a bit.

That circle's center is off of the canvas. It may be best to choose one within the parameters.
While a negative radius would generally be equivalent to a positive radius (depending on definition), please use only a postive radius to avoid confusion.
That circle's radius is HUGE. Probably too big to show up on the canvas.