Graphics

After plotting the dots on a grid, you calculate the numbers for each column’s pin pattern by dividing the design grid into separate print lines. The grid was divided into two lines for this example, each seven dots high. By adding together the pin label numbers of the dots in each column, you can calculate the number needed to produce the desired column pin pattern. The results for the first line are shown in the figure below; the numbers needed to produce the second line were calculated in the same manner. The pin labels are on the grid’s left and the pin totals are at the bottom of each column.

1 2 8

 

 

 

 

 

6 4

 

 

 

 

 

3 2

 

 

 

 

 

1 6

 

 

 

 

 

8

t I f3 I I

I

f I I

/ I I

I

4

2

 

 

 

 

 

1

 

 

 

 

 

046088646464e422l6 8 8 8 8 8 (I 88184328 2 3282000000000000008)184

Once the pin pattern numbers are calculated, you incorporate them into the program using DATA statements, separating each number with a comma.

The following program is similar to the example on page 4-15. This program selects 7/72inch line spacing because only seven pins are used. Because the design is not repetitive, the program cannot use loop constructions to send the same column pattern repeatedly to the printer. Instead, the program must individually read and send each column of graphics data from the DATA statements. The design is 41 columns wide; therefore, both lines 130 and 140 use the number 41.

4-18 Software and Graphics