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Tried this library, it's... well, not that powerful, lacks documentation and is a cheap marketing grab for another, charting, library :/

D3, AnyChart and so on are for charting. GraphicsJS is for drawing graphics, and charting is just one of possible use cases - check out the demos http://www.graphicsjs.org. Docs: http://docs.anychart.com/7.11.1/Graphics