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I’ve only ever owned one graphical calculator, a TI-83, which was bought for me around when I started Secondary School. It was the device on which I broke my programming teeth, making crummy games and utilities to make maths exercises less tedious.

The other week I was experimenting with the HTML Canvas element for another little side-project of mine when I was reminded of the Graph Plot screen which my old calculator has. Essentially it lets you enter a Cartesian equation which it will then plot on the screen.

Subsequently, over a couple of days I put together a Javascript powered equation plotter, with much the same functionality as my TI-83. Oh and in the process I found a bug in the WebKit nightly, which they swiftly fixed.

You’re free to use the source to the how you wish, if you’re that way inclined (it’s a client-side web script so it’s practically open source off the bat). Under the hood it makes use of the MooTools javascript framework, though I’ve not made use of its features extensively, so It would only be a matter of an evening’s work to remove this dependancy.