Apple Newton Utilities Guide de l'utilisateur télécharger pdf (Page 343)

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About the Recognition System 9-1

CHAPTER 9

Recognition 9

Figure 9-0

Listing 1-0

Table 9-0

This chapter and Chapter 10, “Recognition: Advanced Topics,” describe the use of

the Newton recognition system. The recognition system accepts written input from

views and returns text, ink text, graphical objects, or sketch ink to them.

This chapter describes how to use view ﬂags to enable the recognition of text,

shapes and gestures in views. If you are developing an application that must derive

text or graphical data from pen input, you should become familiar with the contents

of this chapter. Before reading this chapter, you should be familiar with NewtonScript

message passing among views and the use of view ﬂags to specify the characteristics

of views, as described in Chapter 3, “Views.”

You need not read Chapter 10, “Recognition: Advanced Topics,” unless you need to

provide unusual input views or specialized recognition behavior. (See that chapter’s

ﬁrst page for a complete list of its topics.)

About the Recognition System 9

The Newton recognition system enables views to convert handwritten input into

text or graphical shapes, and to take action in response to system-deﬁned gestures

such as taps and scrubs.

Any type of view can accept pen input, and different types of views provide

different amounts of system-supplied behavior. Views based on the system-supplied

clEditView and clParagraphView classes handle most forms of pen input

automatically. Applications need not handle recognition events in these types of

views explicitly unless they need to do something unusual. The

clView class, on

the other hand, provides no built-in recognition behavior. Views of this type must

provide all recognition behavior themselves.

The system provides recognizer engines (also called recognizers) that classify

pen input as clicks, strokes, gestures, shapes, or words. Each view can specify

independently which recognizers it uses and how the recognition system is to process

pen input that occurs within its boundaries. For example, you could conﬁgure a view

to recognize text and shapes, or you might enable only text recognition in a view

not intended to accept graphical input.

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