October 1, 1979 FORMATTING ALTER CODES
GRID
Reference Tables ________________
A grid is a combination of special characters (left corner,
grid characters right corner, etc.) known collectively as ____ __________.
Since most of these grid characters are not available on
typewriter keyboards, they must be represented by grid
symbols character _______. The tables which follow are designed to aid
the user by summarizing much of the information given below.
Figure 4.3 illustrates the grid symbols and the characters they
represent; Figure 4.4 shows all the expansion characters.
b (Recall that the symbol "/" denotes a blank.)

A B C

D E F
<=>
G H I

b b / - / -

Figure 4.3 -- Grid Characters and Character Symbols ___________________________________________________

S C H V

A
B Meaning of column headings:
b C /
S D _ -- symbol
C E _ -- grid character
b H F / _ -- horizontal expansion character
b V G / _ -- vertical expansion character
b H /
b b I / /
b b b b / / / /
b - - - /
b /

Figure 4.4 -- Vertical and Horizontal Expansions of Grid ________________________________________________________
Characters __________
38 -- Section 4. Release 9.1 FRESS Resource Manual
October 1, 1979 FORMATTING ALTER CODES
GRID
Grid Construction _________________


GRID ALTER CODE = !+GRID<grid>+

<grid> = <subgrid>
= <subgrid,grid>

<subgrid> = <vert iteration> (<row>) <vert expansion>

<row> = <string>
= <string,row>

<string> = <hor iteration> <symbol> <hor expansion>

<vert iteration> = 1234567890null
<vert expansion> = 1234567890null
<hor iteration> = 1234567890null
<hor expansion> = 1234567890null

b <symbol> = ABCDEFGHI-/ or


Figure 4.5 -- Grid Code Formal Definition _________________________________________
NOTES _____
A grid is a combination of special characters (left corner,
grid characters right corner, etc.) known collectively as ____ __________.
Since most of these grid characters are not available on
typewriter keyboards, they must be represented by grid
symbols character _______.
An important concept employed by the !+GRID+ code is one of
horizontal expansion _____________________. FRESS expands a grid character by
placing one or more expansion characters after the grid
character when the grid is printed. Figure 4.4 lists the
characters used to expand each grid character under the "H"
column.
vertically repeat It is also possible to _________________ (iterate) a whole line
(row) of characters at one time.
After complete expansion of a grid, the line pointer is at the
start _____ of the !+GRID+ code (while after a sub-grid, it is after
the sub-grid just drawn).
FRESS Resource Manual Release 9.1 FRESS ReSection 4.3 -- 39
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