Draw Circle with center and radius

[anthony]

The four values are the X and y of the center and teh x and y of a point on the edge of the circle.

If you have a radius you can just add the redail to either the x or y of the center value to get a point on the edge.

Eg circle at 50,50 with 30 pixel radius...
add 30 to the x value of the center gives 80 so the draw is...

-draw 'circle 50,50 80,50'

For more info see Im draw primatives
http://www.cit.gu.edu.au/~anthony/graph ... primatives