Read the class documentation on my website or download it for offline reading here.
Try out the package before purchasing it! Instructions here!

Multi-touch virtual joystick for mobile games. Implements arbitrary numbers of analog pads (two axes), buttons (down, hold and up events) and toggles (ON or OFF).
The package contains one dll file (VirtualJoystick.dll) which is the only one required and it's required to be in the /Assets/Plugins/ folder or it won't be read. The other two folders are a demo scene with all its assets and a documentation folder with quick start guide and API reference. Those two folder are not required but if you keep them move them out of Plugins folder (wherever you want).

Remember the documentation linked above for more info!