HP 7470A Interfacing And Programming Manual page 80

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ilseofDIandSI
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When DI and SI commands are used together, the DI command estab­
lishes the label's direction and the SI command establishes its size. The
direction serves as the axis along and about which labels (written with
negative SI parameters) are mirrored. Positions of PI and P2 do not
affect the labels. Refer to The Absolute Direction Instruction, DI, and
The Absolute Size Instruction, SI.
Two examples of mirrored labels are shown below. In the first example,
the DI parameters 3,2 place the directional line in the first quadrant.
The negative width parameter of the SI command mirrors the label in
the right-to-left direction. In the second example, the DI parameters
3 , - 2 place the directional line in the fourth quadrant. The negative
height parameter of the SI instruction mirrors the label top-to-bottom.
Use of D R a n d SI
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When DR and SI commands are used together, the label size is deter­
mined by the SI command and does not change with changes in the
settings of P i and P2. However, changes in the settings of P I and P2
will affect the label direction. The algebraic differences (P2
X
- Plx) and
(P2
y
- Ply) are multiplied by the run and rise parameters of the DR
command. The resulting parameters, when applied to the standard
coordinate system, determine the label baseline. Mirroring about this
baseline is determined by the signs of the SI parameters.
In illustration 3, P i and P2 are at their default settings so the algebraic
differences (P2
X
- Plx) and (P2
y
- Ply) are both positive. The DR
parameters 3, - 2 are used as is and establish the directional line in the
fourth quadrant. The negative SI height parameter mirrors the label
from top to bottom.
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P2
3
3
. p i
In illustrations 4 and 5, P I is moved to the lower-right corner and P2
becomes the upper-left corner. Now (P2
X
— Plx) is negative. The DR command
as given is D R 3 , - 2 ; t h e run parameter of the DR instruction is multiplied
by - 1 and the effective DR command becomes DR—3,—2 placing the
directional line in the third quadrant. The negative SI height parameter
mirrors the label from top to bottom. In illustration 5, both SI parameters
are negative and the label is mirrored in both directions, making it appear
upright.
UseofDIandSR
When the DI command is used with SR, only the DI command affects
the directional baseline of labels; changes in the relative positions of P I
and P2 do not affect the baseline. Mirroring about this baseline will
occur when either a negative SR width or height parameter with a posi­
tive difference (P2
X
— Plx) or (P2
y
— Ply) or a positive SR parameter
and a negative difference are present. If respective parameters and dif­
ferences are both positive or both negative, no mirroring will occur.
Label direction is horizontal for all illustrations in this section. The
first three illustrations are drawn with PI and P2 at their power-on
LABELING 5-23
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