ABSTRACT
10.1 Introduction
This chapter describes some examples for pen and multi-touch modeling and recognition. An in-depth look at Petri Nets modeling for input devices is found in Chapter 11. Input device modeling is not a recent phenomenon. After the introduction of the Sketchpad in 1962 by Ivan Sutherland, it was a matter of time until someone would imagine a model for pen interaction. In 1968, William E. Newman published A System for Interactive Graphical Programming, which describes a state-diagram with the flow of a model. Later, in 1990, the seminal work by Bill Buxton showed us what a descriptive model can be for the input devices of that era (e.g., mouse, pen, single-touch) with his publication titled "A Three-State Model of Graphical Input" [Buxton 90]. Another model for input interaction was published by Myers [Myers 90].
