# A heat map like chart using the drawing API rect object

This chart was inspired by Facebooks "heat map"-esque visualisation for determining what computers (though it doesn't have to be computers) are either malfunctioning or sending alerts. In a large datacenter each column could be a particular rack and each individual square a specific computer.

Each individual square is a drawing API Rect object - so each can be assigned its own tooltip, colors and click/mousemove events.

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