HP 7475a, Operation And Interconnection Manual

Page: 31 / 101

of PI and P2 and the physical size of the input window. Whether
invoked manually or programmatically, rotations are not cumulative,
and the rotate function can only be toggled on or off.
When the 90-degree rotate function is invoked with the
ENTER
+
FAST
buttons, the default input window remains coincident with the hard­
clip limits and PI and P2 assume new rotated default coordinate loca­
tions inside the hard-clip limits. These new Pl/P2 values are shown in
the following table. Note that the physical location and size of the
PlIP2 frame are not affected by the front-panel rotate function.
Rotated Default Coordinate Values for Scaling Points PI and P2
Rotated Default Scaling Points (Plotter Units)
Paper
Size
Plx,Ply P2x,P2y
A 154 , 244 7354 , 10 244
A4 0 , 610 7200 , 10610
B
283 , 934 10283 , 16 134
A3 607 , 797 10607 , 15 997
When the 90-degree rotate function is invoked with an R090 instruc­
tion, PI and P2 retain their current coordinate values and may therefore
be rotated outside the hard·clip limits as shown in the following illus­
tration. The default input window is also rotated, but its physical size is
clipped to a square area by the hard-clip limits. Note that the input
window limits programmed pen motion to the window area, but the pen
can still be moved anywhere within the hard-clip limits using the front­
panel cursor buttons. The input window can be expanded to the hard­
clip limits and PI and P2 can be defaulted to the rotated default coor­
dinate values using the HP-GL instructions, IW and lP, without
parameters.
Whether invoked manually or programmatically, the physical size and
location of the hard-clip limits are not affected by the rotate function.
However, the defined lower-left
(LL)
and upper-right (UR) corners of the
hard-clip limits are rotated to maintain the same relationship with
respect to the 0 , 0 origin point. The coordinate values for UR are deter­
mined by paper size and the state of the rotate function; but, the coor­
dinate values for LL will always by 0 , 0 regardless of paper size and
the state of the rotate function. The current plotter unit coordinate
values for
LL
and UR can be obtained by executing the Hp·GL instruc­
tion, OH.
PLOTIER OPERATION
2-13