ijpds formats.book - Kodak

Chapter 1. Overview
Fonts
1 - 10 IJPDS Formats
Bounding box
If the last record executed with spacing values was an SFS, the X and Y
line spacing values in that record affect the cursor position for the starting
point of the next line. The Y value is added to the cell height and the X
value moves the cursor for the starting point of the next line in the X
dimension.
Category II Fonts
Category II fonts use positive and negative escapements and offsets for
each character. Using these parameters, you can arrange the characters
in a variety of ways.
Each character in a category II font is defined in a box called a bounding
box. As shown in Figure 1.9, a bounding box encloses all dots required to
define the character, but does not normally include space around the
character. The bounding box for each character has its own height and
width as defined in the character definition record (CDM or CCD).
Figure 1.9 Character bounding box
The upper left corner of the bounding box is positioned in the page buffer
according to the values for the X and Y offsets in the CDM or CCD. The
offsets are signed binary fields and, therefore, can be negative or positive
values.
The upper left corner of the bounding box for the first character in a line is
placed at the position determined by adding the X and Y character offset
values to the current cursor position. In the first example in Figure 1.10,
the a character has an X offset of 0 and a positive Y offset. The cursor
position for the next character is then determined by adding the X and Y
character escapement values to the cursor position for the first character.
Note: The cursor position for the first character is the cursor position before the
offset values for the first character are added. The offset values do not
change the cursor position.
In the second example in Figure 1.10, the a character has a Y
escapement of 0 and a positive X escapement. The upper left corner of
the j character bounding box is then determined by adding the offset
values for j to the cursor position. Using a negative X offset for j allows
overlapping of the two characters. The character spacing X and Y values
are added to the X and Y character escapement values in the CDM or
CCD. The SFS record provides a means of altering the spacing between
characters.