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HP DeskJet 600, 700, 800, 900 & HP 2000 Series PCL Developer’s Guide 19
point (0,0) may change. The point (0,0) then, does not necessarily equate to the top of the
paper.
6.2.2 CAP Reference Point
The first line starts at the (0,0) coordinate. CAP starts at (X,Y), where X= the left margin set-
ting, and Y= the top margin setting. CAP is moved the distance of the Horizontal Motion Index
to the right after printing a character and one dot row down after printing graphics. The physi-
cal location of the (X,Y) coordinate can change due to the size of the first printed character.
Characters are placed with their reference points at CAP. The reference point is on the char-
acter baseline, a horizontal line just under the bottom of the non-descending characters. This
means that if the top margin is at the top of the logical page, text cannot be printed at (0,0)
because most of the character would be above the top edge of the page.
Graphics, however, can be printed at (0,0) because they do not move above CAP. Graphics
begin at the vertical level specified by CAP and then move downward on the page from that
point.
CAP Position
Portrait
Landscape
Logical Page
Logical Page
ABCD...
ABCD...
X
Y
Y
X
(0,0)
(0,0)
Top Margin
Top Margin