Combined the below examples to draw & paint an area (polygon) selected by the user (Used HTML5 Canvas element to draw & paint the polygon; Have to try Raphaeljs to do the same thing)
http://stackoverflow.com/questions/4649293/lasso-tool-in-javascript
http://stackoverflow.com/questions/4839993/how-to-draw-polygons-on-an-html5-canvas
http://stackoverflow.com/questions/4649293/lasso-tool-in-javascript
http://stackoverflow.com/questions/4839993/how-to-draw-polygons-on-an-html5-canvas
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