You can indeed convert the charts to png files (see this
thread). Note that you can only do this in browsers that support both SVG and canvas elements (basically everything except IE < 9).
On Tuesday, November 27, 2012 2:02:53 PM UTC-5, Michael Fever wrote:
I'm hoping they willl just keep the image charts going. I'm in the same boat. Sure the new jsapi charts are great for displaying on a website but they are absolute no good if you need to embed into a PDF report.TCPDF has its own charting library but its nowhere near as powerful as the google API.
Someone was toying around with using HTML5 to write the chart to a canvas and then export that canvas to an img somehow.. but I dont know if that would work.
Maybe they'll keep the charts alive past 4/20/2015.