Apple Newton Utilities User's Guide download pdf (Page 344)

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CHAPTER 9

Recognition

9-2 About the Recognition System

Although no recognizers are associated with clicks and strokes, they do pass

through the recognition system, allowing your view to respond to them by means

of optional

ViewClickScript and ViewStrokeScript methods that you

supply as necessary. The

ViewClickScript method of a view that accepts pen

input takes application-speciﬁc action when the pen contacts or leaves the surface

of the screen within the view’s boundaries. The

ViewStrokeScript method

performs application-speciﬁc processing of input strokes before they are passed on

to the gesture, shape, or text recognizers.

The gesture recognizer identiﬁes system-deﬁned gestures such as scrubbing items

on the screen, adding spaces to words, selecting items on the screen, and so on.

Views based on the

clEditView and clParagraphView classes (edit views

and paragraph views, respectively) respond automatically to standard system-

deﬁned gestures; other kinds of views do not. Your view can provide an optional

ViewGestureScript method to perform application-specific processing of

system-deﬁned gestures. You cannot deﬁne new gestures to the system.

Only views based on the

clEditView class can recognize shapes. The shape

recognizer uses symmetry found in input strokes to classify them as shapes. The

shape recognizer may make the original shape more symmetrical, straighten its

curves, or close the shape. There is no developer interface to shape recognition.

The system provides two text recognizers—one optimized for a printed handwriting

style and another optimized for a cursive handwriting style. The printed text

recognizer (also called the printed recognizer) requires that the user lift the pen

from the screen between letters. The cursive text recognizer (also called the cursive

recognizer) accepts cursive input (letters connected within a single word), printed

input (disconnected letters within a single word), or any combination of these two

kinds of input.

In views that recognize text, the system enables the printed recognizer by default

unless the cursive recognizer is enabled explicitly. The user can specify the use of a

particular text recognizer from within the Handwriting Recognition preferences

slip. This user preference slip and others that affect recognition behavior are

discussed in “User Preferences for Recognition” beginning on page 9-14.

Only one text recognizer can be active at a time—all views on the screen share the

same text recognizer—but individual views can specify options that customize its

behavior for a particular view. Individual views can also use any combination of

other recognizers in addition to the speciﬁed text recognizer. Regardless of which

text recognizer is in use, the recognition system limits the size of individual input

strings to 32 characters—longer words may not be recognized correctly.

Although the Newton platform currently supports only its built-in recognizers,

future versions of the system may permit the use of third-party recognizer engines.

The next section describes how the recognition system classiﬁes input as text,

shapes, or gestures.

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