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After plotting the dots on a grid, you calculate the numbers for each pin
pattern by dividing the design grid into separate print lines. For the
arrow design, the grid was divided into two lines,
each
seven dots high.
Then each column was examined to calculate the graphics data. The
results for
the
first line are shown below. The pin values are on the left
and the sums at the bottom of each column.
128
64
32
16
8
4
2
1
I
I
64 80
68 64 64 64 64
32 16
8
8 8
32 8
2
0
0
0
0 0 0 0 0
8 8 8 8 8 184 32 8 2
0 0 0 0 0 0 64 16 4
The numbers for the second line were calculated in the same way. Once
the numbers for the pin patterns are calculated, they are put in the
program in DATA statements, separated by commas.
The program works in a similar way to the example before. This time it
selects 7/72-inch line spacing because only seven pins are used. Because
the data is not repetitive, each column of graphics data is read from the
DATA statements and sent to the printer. The design is
41
dot positions
wide. Therefore both lines 130 and
140
use the number 41.
4-18 Using Software and Graphics