Abstract
One of the big challenges of developing interactive statistical applications is the management of the data pipeline, which controls transformations from data to plot. The user's interactions needs to be propagated through these modules and reflected in the output representation at a fast pace. Each individual module may be easy to develop and manage, but the dependency structure can be quite challenging. The MVC (Model/View/Controller) pattern is an attempt to solve the problem by separating the user's interaction from the representation of the data. In this paper we discuss the paradigm of reactive programming in the framework of the MVC architecture and show its applicability to interactive graphics. Under this paradigm, developers benefit from the separation of user interaction from the graphical representation, which makes it easier for users and developers to extend interactive applications. We show the central role of reactive data objects in an interactive graphics system, implemented as the R package cranvas, which is freely available on GitHub and the main developers include the authors of this paper.
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