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Background
this way of setting up the skin using a hash with arguments is pretty elegant - I forgot to mention that you can obtain the coordinates for the hotspot by using a global event listener on the canvas/group and make that print the coordinates for drag/drop to the console. That way, it is easy to come up with the coordinates for all widgets, but also for the inner screen region - i.e. where you'd probably use clipping and/or a canvas image child to reference the actual graph canvas.If you are planning on adding such a skin also to your GCA addon, my suggestion would be to come up with a helper class, e.g. something like "Skinnable", using an outer image and an inner one (potentially, even a vector of images). The helper class could also contain support for setting up hot-spots specific tooltips. I've been in touch with Stuart about this, mainly in the context of his recent FG1000 work, so if you should come up with such a helper class (or even just a wiki tutorial demonstrating the approach), that may be helpful in and of itself.[1]
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