Compuprint 4247-Z03 Programmer Manual - Manual (Page 98)

between the X and Y coordinates and the logical and physical medium.
I and B Coordinate System
In addition to the X,Y coordinate system, IPDS uses another coordinate system, the I-B coordinate system.
These coordinates describe the placement and orientation of text or images on the logical page. The
printer places characters along the I-axis for a line of text. The B-axis is the direction in which the printer
places lines of text on the logical page. IPDS commands can change both the origin and the orientation of
the I and B axes (see Figure 5 on page 79).
Direction: As the printer places text characters on the page, the inline coordinate increases. The direction
of this increase is the positive inline direction or +I. The baseline coordinate also increases as the printer
places text lines on the page. The direction of this increase is the positive baseline direction or +B.
Location parameters within the IPDS commands specify the I and B directions. Chapter 4, “IPDS
Programming Information,” on page 99 contains specific information about these commands.
Distance: The inline coordinate increases a predetermined distance as the printer places the text
characters on the page. This distance is the character increment. The baseline coordinate also increases a
predetermined distance as the printer places lines of text on the page. This distance is the baseline
increment. Location parameters within the IPDS commands specify the I and B distances. Chapter 4,
“IPDS Programming Information,” on page 99 contains specific information about these commands.
Initial coordinates: The coordinates of the first print position on the logical page are the initial
coordinates. The initial inline print coordinate is I
i
. The initial baseline print coordinate is B
i
.
Current coordinates: The coordinates of the current print position on the logical page are the current
coordinates. The current inline print coordinate is I
c
. The current baseline print coordinate is B
c
. Figure 5
on page 79 shows the various I and B coordinates on the logical page:
Figure 4. The X and Y Coordinate System and the Logical Page
78 Programmer Manual