Apple Newton Utilities User's Guide download pdf (Page 346)

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CHAPTER 9

Recognition

9-4 About the Recognition System

multiple stroke units into meaningful groups. For example, certain letters (such as

an uppercase

E) might be composed of multiple strokes. The process of grouping

input strokes is inﬂuenced by the user preference settings for handwriting style and

letter styles.

The recognizer that claimed one or more stroke units returns to the view one or

more interpretations of the strokes. The gesture and shape recognizers return

only one interpretation to the view. The text recognizer usually returns multiple

interpretations to the view.

Associated with each interpretation is a value, called the score, which indicates

how well the input matched the system-deﬁned model used by the recognizer that

interpreted it. When multiple recognizers are enabled, the system selects the best

interpretations based on their scores and the application of appropriate heuristics.

For example, the text recognizer might choose between interpreting a stroke as a

zero or as the letter

O based on whether you have speciﬁed that the view accepts

numeric or alphabetic input.

The recognizer that claimed the strokes places its best interpretations in another

kind of unit that is returned to the view. The text recognizer returns

word units, the

shape recognizer returns

shape units, and the gesture recognizer returns gesture

units. Each of these units contains data representing one or more strokes. A word

unit represents a single recognized word, a shape unit represents a single

recognized shape, and a gesture unit represents a single recognized gesture, as

shown in Figure 9-1. The next several sections describe how the system handles

each of these units.

Gestures 9

When the recognition system returns a gesture unit to the view, the view performs

the action associated with that gesture automatically. The action taken is dependent

on the kind of view that received the gesture unit.

Edit views and paragraph views respond automatically to system-deﬁned gestures

such as scrubbing items on the screen, adding spaces to words, selecting items on

the screen, and so on. Other kinds of views may do nothing in response to a

particular gesture.

You can provide an optional

ViewGestureScript method to take action in

response to any standard gesture. For example, you can use this method to respond

to gestures in views that are not paragraph views or edit views. You can also use

this method to override or augment the standard behavior of a particular view in

response to system-deﬁned gestures. At present, you cannot deﬁne custom gestures

to the system.

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