Graffiti Canvas turns an HTML Canvas object into a free-to-draw-on element, supporting both mouse and touch interactions.
Call gc___init('#canvasElement') to initialize the drawing feature on the Canvas object specified by the selector. Optionally add a second Parameter with the stroke color, e.g. 'red' (default is 'black').
No third-party Javascript library is required.
Graffiti Canvas is public domain. Grab it, modify it, use it.