ruby gem to support drawing

Is there a ruby gem which has pens/paint brush and stuff so that one can draw on a site? If not, how can I start developing something like that?

I basically want to create a simple app which lets people draw sketches and stuff online. I'm open to using other frameworks other then rai开发者_Go百科ls.

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No, there is not. Ruby is a server side stuff, while drawing is a client side.

You need to search some javascript libraries.