I'm using the google charts library to make some interactive scatter plots. And I cannot find is whether you can have symbols other than circles as "markers" ? As far as I can see it was possible with the previous obsolete version of google charts. But is it impossible with the current one ?
Scatter chart "playground": https://code.google.com/apis/ajax/playground/?type=visualization#scatter_chart
Currently (as of July, 2013) there is no way to do this within the chart options. You have a choice between circles and no markers, and that's it.
You could go through the code and change the SVG using javascript, changing the circles to rectangles, and manipulating the coordinates appropriately (or drawing paths, or whatever you'd like). That's really the only way to do it.
Edited to add:
Additionally, you could set a fill for the circles themselves using javascript, and make the fill any shape you'd like.
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