HP 7470A Interfacing And Programming Manual page 118

Graphics plotter
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The loop to draw the axis and the statements to set character and tick
length and to label and title the X-axis are:
50 PRINT"SI.2,.3;TL1.5,0"
80
FOR X=1 TD 12
70 PRINT "PH";X,",O;
XT;"
80 REHD H3
90 PRINT"CP-.33,-1;LB";P$;"E"
100
NEXT X
110 PRINT "PHB.5,0;CP-?,-2.5;
LBCHLENDHR MUNTHE"
IIJIIJIIFII'|IMII'I|H||,||[».-1||V'|l'J|I'|lJI|:IlHIIISIISII'||Ul|,||t.\ll|-.l|DlI
The Y—axis i s created in a similar manner, except the lo0p's index is
used for the label value and two different CP commands are used for
labels of three digits and labels of less than three digits. The Y-axis title
is centered above the axis.
Following the axis routine is the command which labels the regions for
the legend. It is drawn now while the label size is small and the narrow
pen is installed. Note that the label statements contain the spaces nec­
essary to space the legend across the top of the graph. These lines were
inserted near the end of the creation process and involved trial and
error to achieve satisfactory results. The lines for the legend will be
drawn later as each line of data is plotted.
The lines which draw the Y-axis, label it, and draw the legend labels
follow:
120 FOR Y=O T0 150 STEP 25
130 PRINT "PH 1,",Y,"YT;"
140 IF Y<1OOTHENPRINT "CP-3,-.25;LE";Y;"E"
150 IF Y>S9 THENPRINT "CP-4,-.35;
LB";Y;"§"
180
NEXT Y
170 PRINT "PH1,15O CP-3.5,2
LBSHLES$§CP-S,-1"
180 PRINT "LBiTHDUSHNUS)
UNITED STHTES
E"
190 PRINT "LBEURDPE
JHPHN
SOUTH HMERICHE"
84
PLHWTNGTTHECOMhLANDSTO\NORK

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