Chris, yeah me too. I was about to say ok let's go just with option 2, but you don't need the parameter for width of bins. If you draw it as Larry suggests, then later by resizing to double or triple histogram width you basically get the same thing as if you used the parameter X=2, or X=3 for bins width. So, yeah I will do it as Larry said.
Just one thing, do you want me to put limit for minimum bins? I vote no, but would be cool to hear what you think. So if the user wants 2 bins he will have to live with the fact that what will be drawn won't be that visible, I mean 2 pixels width :). I hear Will's voice in my head "Ergh you put limits again!" :).
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