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CHAPTER 10
Recognition: Advanced Topics
10-14 Using Advanced Topics in Recognition
To obtain the best performance and to conserve available memory, create your
rcBaseInfo frame by cloning the frame provided by the
ROM_canonicalBaseInfo constant. Store your frame in a slot named
rcBaseInfo in your input view’s recConfig frame.
For a detailed description of the
rcBaseInfo frame, see “Data Structures Used in
recCong Frames” (page 8-24) in Newton Programmers Reference.
The rcGridInfo Frame 10
The rcGridInfo frame allows you to define the position of one or more single-
letter input areas within a single input view. Its purpose is to facilitate the creation
of views having multiple single-letter input areas, such as might be used by a
crossword puzzle application. Providing a separate view for each single letter input
area would be extremely inefcient; the use of an
rcGridInfo frame allows you
to draw one view that provides the illusion of many input views, by dening to the
recognizer the size of an individual input area and the spacing between input areas.
Figure 10-4 depicts an example of the grid that an
rcGridInfo frame denes.
The boxes shown in this gure are not views themselves, just lines on the screen
that indicate the location of the input areas to the user. The recognition behavior is
provided by the view that draws these boxes; the
rcGridInfo frame helps the
recognizer determine the precise location of user input, and, consequently, where to
display its output. By providing the proper slots, you can use an
rcGridInfo
frame to dene a row, column, or matrix (as shown in the gure) of single-letter
input areas within a view.
Figure 10-4 Two-dimensional array of input boxes specied by rcGridInfo frame
boxRight
boxBottom
boxTop
xSpace
ySpace
boxLeft
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