Once I got going with them, they were actually pretty straightforward. You can actually add all kinds of markers to your google chart, complete with funky icons and customisable colours! The code I added to make these is simply:
&chem=y;s=bubble_text_small;d=bb,Max:+917,FFFFFF,660066;ds=0;dp=15|y;s=bubble_text_small;d=bbtr,Min:+185,FFFFFF,660066;ds=0;dp=20
All we have here is a simple specification of which kind of bubbles I want, the label for them and which data series (ds) and data point (dp) to attach it to. I generated the bubble tail directions sensitive to whether they were a min or max label, and which half of the graph they are in.
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My interest was mostly because I’m working on a book chapter which includes some static analysis content, and there are a couple of these tools that I include in my own builds, but I don’t do much with the output of them. However I didn’t want to drop anything from the chapter if it was actually a valuable tool and I was just missing the point – pretty much all the tools got a good number of votes though, so I’ll be covering all of the above. It does look as if phploc has less of a following, however it’s one of my favourite tools so it gets a mention anyway!
Thanks to everyone who took the time to vote; I thought I’d share the results in case anyone was interested.