The Relative Character Size Instruction, Sr - HP 7470A Interfacing And Programming Manual
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' S I 1 , 1 . 5 ; L B ? 4 ? O R V
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Negative SI parameters will produce mirror images of labels. A nega-
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tive SI width parameter will mirror labels in the right-to-left direction.
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COMMAND
RESULTING LABEL
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" S I - . 3 5 , .6;LBHPV
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9*P. ,T3
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A negative height parameter will mirror labels in the top-to-bottom
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direction.
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COMMAND
RESULTING LABEL
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" S I . 3 5 , - . 6 ; L B H P V
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"SI-.3.5,-.6;LBHPV'
111
Two negative SI parameters will mirror the label in both directions and
the label will appear to be rotated 180 degrees.
COMMAND
RESULTING LABEL
. 1
For further information on the effects of negative parameters, refer to
the section Parameter Interaction in Labeling Commands later in this
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chapter.
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In order to produce legible characters, parameters should be greater
than Q.l. Parameter values above 18 allow a maximum of one character
to be drawn on the paper.
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T h e Relative Character Size
g~i —^
instruction, SR
E H - 3
The relative character size instruction, SR, specifies the
size of characters and symbols as a percentage of the distance between
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scaling points P i and P2.
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The instruction can be used to define character size relative to
p i n l ^
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the distance between P i and P2 so that if the P1.P2 distance changes,
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character size will adjust to occupy the same "relative" amount of
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space.
^ l l ' i ' x j
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ftWIfiEi
SR width, height terminator
1
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Kija
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SR terminator
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o-16 LABEUNG
l f f i ~ T 3
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imifliiKllHul
If parameters are included, two parameters are re
quired, width and height. The defined width and height are interpreted
as a percentage of the algebraic distance between the X- or Y-coordinates
of P i and P2. The parameters are in decimal format and may have any
value between -128 and 127.9999. An SR command with no parameters
will default to the values 0.75 for width and 1.5 for height, which, when
P I and P2 are a t default values, produces letters the same size as a n SI
command without parameters.
An SR command remains in effect until another valid SI or SR com
mand is executed or the plotter is initialized or set to default conditions.
An SR command which sets a n error condition is ignored and t h e
character size does not change.
The following example shows how changes in P i and P2 affect labels
drawn while a n SR command is in effect. The upper label is written
with default character size. Then P i and P2 are changed to define a
square area with 6000-plotter-unit sides. A new label is drawn. Next a
new SR command is executed with both width and height parameters
set to three percent. Because t h e area established by P I and P2 is
square, equal parameters create square letters. With default P I and P 2
settings, equal parameters do not create square letters.
" I N ; S P 1 ; P R 1 0 0 , 7 0 0 0 ; L B D E F A U L T
S l Z E V
" I P
1 0 0 0 , 1 0 0 0 , 7 0 0 0 , 7 0 0 0 ; PFI1 0 0 , 6 5 0 0 ; "
"LBNEW P1 AND P2 CHANGE LABEL S I Z E K S R 3 , 3 J "
" P f l 1 0 0 , 6 0 0 0 ; L B N E W
SR COMMANDS,
l
rCHANGES L A B E L
S I Z E V
DEFAULT SIZE
MEW P I AND P 2 CHANGE LABEL SIZE
NEW SR
COMMAND
CHANGES
L A B E L
S I Z E
Either negative SR parameters or switching the relative positions of P I
and P2 will produce mirror images of labels. Refer to The Absolute Size
Instruction, SI, and Parameter Interaction in Labeling Commands for
more information on mirroring.
With default P I and P2, the useful range of width and height param
eters which produces legible characters and a label of suitable length is
0.6 to 5.
LABEUNG 5-17
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