Apple Newton Programmer’s Newton 2.0 (for Newton 2.0) - Manual (Page 391)

C H A P T E R 1 0
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
an 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;