Trochoid

** This full version of Trochoid is now free for a limited time! **

Make amazing and colorful Spirograph-like wallpaper for your iPhone or iPod Touch with Trochoid!

If you have ever played with a Spirograph, you have created curves known as epitrochoids* and hypotrochoids**. Using a Multi-Touch interface, Trochoid allows you to create amazing designs based on these curves that you can save in your Photo Library where they can be turned into wallpaper or shared.

Its fun and addicting watching the design change with Multi-Touch gestures and seeing what colors the color scheme generator comes up with.

FEATURES
- Create colorful Spirograph-like designs
- Designs update in real-time to your Multi-Touch gestures.
- Unlimited randomly generated color schemes produce some very cool effects. Change schemes with a double-tap.
- Unique circular swiping to change the amount of detail in the designs.

Tip : set r=1 to see some really intricate designs.

See the Trochoid Gallery for example images generated by Trochoid. http://web.me.com/timnichols/iPhone/Trochoid_Gallery.html. Send an image to trochoid@me.com to include it in the gallery.

For math fans only:

* an epitrochoid is a curve generated by a pen a distance P from the center of a circle of radius r that is revolving around the outside of another circle of radius R.

** a hypotrochoid is similar to an epitrochoid, but the circle with the pen revolves around the inside of the other circle.

Trochoid allows you to manipulate the values of P, r, and R and see the effects in real time.