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Last evening, we then build the calculator shown in the picture below. It's a portable web application using Ruby and my new Wee framework. I spent most time on generating the diagram (it's done using gnuplot). The rest was straightforward, once we had the underlying calculations working.

The total code size is 360 lines of code (including HTML), of which 110 are used for the calculation and for generating the diagram. Lots of lines of code are currently spent in conversion and validation routines (german number format).