The Relative Character Size Instruction, Sr - HP 7470A Interfacing And Programming Manual

' 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-
J tive SI width parameter will mirror labels in the right-to-left direction.
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x COMMAND RESULTING LABEL _ i . _
" S I - . 3 5 , .6;LBHPV C j l l 9*P. ,T3
\ A negative height parameter will mirror labels in the top-to-bottom E £ - l — ^ 3
' direction. ™ - , — r j
) COMMAND RESULTING LABEL
) " S I . 3 5 , - . 6 ; L B H P V |_J L
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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
) chapter.
\ 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.
Ev3
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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
) scaling points P i and P2. I
l*ElTl The instruction can be used to define character size relative to p i n l ^
I the distance between P i and P2 so that if the P1.P2 distance changes, 1
character size will adjust to occupy the same "relative" amount of . j
) space. ^ l l ' i ' x j
) ftWIfiEi SR width, height terminator 1
\ ™ Kija
> SR terminator ""-^ j [ » 3
o-16 LABEUNG l f f i ~ T 3
)
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