Figure 5. The X And Y Coordinate System And The Logical Page - Printronix S828 Programmer's Manual

Programmer Manual PTX‐S828
between the X and Y coordinates and the logical and physical medium.

Figure 5. The X and Y Coordinate System and the Logical Page

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).
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 5, "IPDS
Programming Information," 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 5,
"IPDS Programming Information," 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 Ii. The initial baseline print coordinate is Bi.
Current coordinates: The coordinates of the current print position on the logical page are the current
coordinates. The current inline print coordinate is Ic. The current baseline print coordinate is Bc. Figure 6
shows the various I and B coordinates on the logical page:
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