The Google Chart API lets you dynamically generate charts. To see the Chart API in action, open up a browser window and copy the following URL into it:
http://chart.apis.google.com/chart?cht=p3&chd=t:60,40&chs=250×100&chl=Hello|World
Press the Enter or Return key and - presto! - you should see the following image:
By just manipulating the URL parameters you can create any type of chart
http://chart.apis.google.com/chart?cht=p3&chd=t:10,20,5,10,5,40&chs=250×100&chl=bi|reports|eashboard|datawarehouse|erp|kpi
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