Qt is a cross-platform development framework based on C++ [15]. An initial prototype was written using Necessitas 4.8.2, a version of Qt which aims to support Android implementations [16] and the QCustomPlot graphics library [17]. However, although the implementation ran on an Android-based Nexus 7 tablet, it was not possible to implement the gesture-based interaction expected of a mobile application and development switched to O.S.-specific environments.