How to transform/scale GV ordinates to PNG ordinates


I've have been trying to generate a Graphviz graph, to be displayed on a web page and then overlay clickable regions onto the image so that I can click on particular nodes and do something clever with it.

My problem is translating the ordinates used by Graphviz into genuine xy ordinates that relate to the generated PNG image. I know this issue has been mentioned several times in the past on this and other forums, but I've not managed to find a solution (such that there are) that actually works, or detailed enough to use.

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