Turn your Raspberry Pi into an Oscilloscope/XY Plotter with Python

This device translates X-Y analog plotter output into a stream of HP-GL commands to a file. (Hewlett-Packard Graphics Language, http://en.wikipedia.org/wiki/HP-GL). You can replace your mechanical pen plotter with a Windows-based software plotter, such as SPLOT (http://www.swplot.com/splot.htm).

maths problem (geometry) within an interactive web-app

Convert pictures into g-code for an XY-plotter

XY Plotter - Arduino Project