Pick a polygon, then a transformation, then press the Go button. Cartesian coordinates grid. Unit of length is the pixel. See BestWavesLive.com No File I/O Java code.
a free cross platform precise unit converter, supports 6000+ units
The NumericalChameleon is a free, open source, cross platform software in order to convert units. It converts numbers with a precision of up to 1000 significant figures. It supports more than 6000 units in 94 categories. It has been localized in 10 languages.