Chapter
11
Varieties of Graphics Density
We introduced you to FX graphics by having you use Single-
Density Graphics Mode and a single pin per column. In this chapter
we cover six more graphics densities and provide examples of designs
that use pin combinations. We also offer you several tips for program-
ming graphics.
Graphics Programming Tips
Let’s start with a program that fires the four low graphics pins in
each column. Since these pins are labelled 1,2,4, and 8, and since the
sum of these four labels is 15, send a CHR$(15) to the printer:
NEW
20 A$=CHR$(27)+"K"+CHR$(l00)+CHR$(0)
30 B$=CHR$(l5)
40 LPRINT A$;:
FOR X=1 TO 100: LPRINT B$;: NEXT X
80 LPRINT CHR$(27)"@"
Sure enough, CHR$(l5) fires the four low pins.
This is basically the same program as the.one you used to print the
first slash in the last chapter, but we‘ve added a new wrinkle. We have
you store the concatenated string for entering Single-Density
Graphics Mode in the variable A!$ and the string for data in B$. The
first variable makes it easy to enter a Graphics Mode several times in
one program, and the second, to send data repeatedly.
143
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