112
PQ-8P, PQ-8S
Comments—¬GX<'text'>
Allows text to be added to IOGL
commands for documentation.
Comments will not print out.
For example: ¬GX’Pie chart with 3
elements’ can be used to document
an IOGL pie chart command.
6.7 I-O Graphics Language
™
(IOGL)
in Action
6.7.1 G
ENERAL
S
TEPS
I-O Graphics Language
™
(IOGL) can
be used in many different ways. It
can enhance the appearance of
standard host reports through a few
simple graphical elements such as
lines, boxes, and circles; or it can
be used to present pertinent data
through charts. IOGL can even be
used to create sophisticated elec-
tronic forms. However, progra-
mming with IOGL follows the
ame general steps:
1.Determine which IOGL
elements are needed to create
the desired output. (For
example, the bar chart in Figure
6-19 uses four different IOGL
elements.)
2.Determine the printable area of
the page.
3.Determine the positioning of the
graphical elements relative to
the top left-hand corner of the
printable area.
4.PCL color printer only:
Determine the order in which
to print the graphical elements.
The lines of the last IOGL
element will overlap (and cover)
the previous IOGL elements.
5.Design the graphical output,
one element at a time.
6.Link the graphical output
with your host application.
6.7.2 T
UTORIAL
The following example (Figure
6-19) shows how multiple IOGL
elements interact to create a bar
chart.
