Rounded Color Picker

I’m in a project which I have to allow the user to pick a color as its prefer. Searching for Color Picker plugins I only found color pickers squared or with seekbars to adjust R, G, and B values to get a color. I’m searching for something like this:

Does someone know a way to do it?

Thanks in advance.

as far as I know this is the Farbtastic Color Picker jquery plug-in.
and to have the shape that you want you’ll need some images: marker, mask and the wheel. and put them in your css directory.
You’ll have more information in this link and a sample project that you can download: