Simon Willison’s Weblog

Google Charts release notes, February 2010. More new Google Charts Image API features I hadn’t noticed before: charts of large data sets can now be generated using a POST request, but the killer feature is the ability to add ?chof=validate to see useful error messages. ?chof=json is interesting too—it gives you back a JSON object detailing the coordinates of various interesting shapes on the associated chart, which you can then use to create your own image maps or JavaScript tooltips. It’s a shame it doesn’t support JSON-P.