Looking Ahead - HP 7470A Interfacing And Programming Manual
Graphics plotter
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Also See for 7470A:
- Operator's manual (41 pages) ,
- Interfacing and programming manual (114 pages) ,
- Service manual (141 pages)
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Looking Ahead
Of course you want to use your plotter to create high quality graphic
plots. Most plots fall into one of three broad classes: line graphs, bar
graphs, or pie charts. Chapter 8 contains a discussion of a line graph.
Shown below are a bar graph and a pie chart.
Pie charts are an effective way to show parts of a whole entity; the
slices of the pie are the component parts. The pie chart here has some L
segments "exploded" for emphasis. To construct a pie chart, the data is
computed as a percentage of the total and each data value is converted
to the appropriate segment of a full 360—degree circle. A simple circle
drawing program is found under the PA instruction in Chapter 3. To
create a pie chart you'll need to draw segments of a circle (arcs) and
connect the endpoints of the arcs to the circle's center with plotted
lines.
There are three types of bar graphs; simple bar graphs, stacked bar
graphs, and clustered bar graphs. The simple bar graph here shows that
sales are increasing. Bar
graphs are essentially a
collection of rectangles;
i.e., four plotted lines.'
Each of these rectangles
--=~ww~-
m
is filled; refer to the ad
vanced programming tips
at the end of Chapter 8
tolearnhow tocreate a
filled or hatched area. A
stacked bar might be used
to showthesesamesales
-
data broken down into
sales by region. Portions
of each bar would be
350.;
colored or shaded differ
ently to show the sales in
each region. Another-way
of showing sales by region
would be to use a separate
bar for each region and
to "cluster" all the bars
for one year together with
a larger space between
each cluster of bars. There
is
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GETTING STARTED 1-15
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