You can use the sliders to work within the default parameters. If you wish to use a function of an entirely different form, use the input line to enter “f(x)=_____” where r=f(x) and x=θ.
You can begin the animation by pressing “play” AND you can adjust the parameters at any time! (Note: This is the “light” version for quick web loading. The full version has a much higher resolution.)For High Res version visit http://www.geogebratube.org/material/show/id/131620