Compuprint 4247-Z03 Programmer Manual - Manual (Page 165)

Note: The Graphics X and Y coordinates are not the same as the media X and Y coordinates. The
horizontal axis is Graphics X; the vertical axis is Graphics Y. The intersection of the Graphics X and
Y axes is coordinate (0,0). The horizontal axis is positive to the right of center and negative to the
left of center. The vertical axis is positive to the top of center and negative to the bottom of center.
Therefore, both positive and negative values are valid. Negative values are specified in
twos-complement form.
All coordinates are in coordinate units, called drawing units that are the same as units in the Graphics
Data Descriptor (GDD) structured fields. Figure 6-27 shows the Graphics X and Y coordinate system.
Graphic Medium Presentation Space
The graphic medium presentation space is an abstract coordinate space where graphics are composed. It
is a conceptual structure defined by the limits of the coordinate space as shown in Figure 17 on page 146.
Units are defined in “Graphic Data Descriptor (GDD)” on page 151.
Figure 16. The Graphics X and Y Coordinate System
Chapter 4. IPDS Programming Information 145