added dataWidth and dataHeight computation to the calculateCoordinates function so that getDimensions in Nodeservice will now return valid data dimensions
added dataWidth and dataHeight computation to the calculateCoordinates function so that getDimensions in Nodeservice will now return valid data dimensions

ProgrammingLife2016/PL5-2016,ProgrammingLife2016/PL5-2016,ProgrammingLife2016/PL5-2016