Apple Newton Utilities Guide de l'utilisateur télécharger pdf (Page 391)

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CHAPTER 10

Recognition: Advanced Topics

Using Advanced Topics in Recognition 10-15

If you provide a grid in which the user is to write characters or words, you need to

use an

rcGridInfo frame to deﬁne the grid to the text recognizer. For example,

the

protoCharEdit system prototype uses an rcGridInfo frame internally to

deﬁne the input areas (cells) in the comb view it provides.

The recognizer uses the information in an

rcGridInfo frame to make character-

segmentation decisions. You can use the

rcGridInfo frame in conjunction with

rcBaseInfo frame to provide more accurate recognition within boxes in a

single view. Recognition in the most recently used grid box begins as soon as the

user writes in a new box in the grid.

The NewtonScript code used to create the grid shown in Figure 10-4 looks like the

following example.

rcGridInfo := {

boxLeft: 100,// x coordinate of left of top-left box

boxRight:145,// x coordinate of right of top-left box

xSpace:55,// x distance from boxLeft to boxLeft

boxTop: 50,// y coordinate of top of top-left box

boxBottom:95,// y coordinate of bottom of top-left box

ySpace:55// y distance from boxTop to boxTop

};

To obtain the best performance and to conserve available memory, create your

rcGridInfo frame by cloning the frame provided by the

ROM_canonicalCharGrid constant. Store your frame in a slot named

rcGridInfo in your view’s recConfig frame.

For a detailed description of the

rcGridInfo frame, see “Data Structures Used in

recConﬁg Frames” (page 8-24) in Newton Programmer’s Reference

Creating Single-Letter Input Views 10

The following code fragment creates a single-letter input view’s recConfig

frame. This frame, which includes

rcBaseInfo and rcGridInfo frames, is

based on the

ROM_rcSingleCharacterConfig frame supplied by the system.

// specify box (or horizontal array of boxes)

// into which character(s) are written.

myView := {

recConfig: ROM_rcsinglecharacterconfig,

…}

// height of a lowercase letter

constant kSmallHeight := 11;

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Apple Newton Utilities Guide de l'utilisateur Page 391

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