in reply to Pixel-based Plotting in Perl?
I'd echo SDL for the nearest thing to old-school BASIC graphics from perl.
And - to be a little heretical - I'd say that the closest+easiest thing today is javascript in a browser which supports the 'canvas' HTML element (e.g. firefox).
That allows you to run in an interactive way, use moveto/lineto as you may be used to and also easily allows you to share your fun with other people (since you can serve the javascript from a static HTML file hosted somewhere.
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