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WIDTH statements
Some software (including most versions of BASIC) automatically
inserts carriage return and line feed codes after every 80 or 130
characters. This is usually no problem with text, but it can spoil your
graphics. Two extra columns of graphics are printed in the middle of
the ones you send, and are left over and printed as text.
In some versions of BASIC you can prevent unwanted control
codes in graphics by putting a WIDTH statement at the beginning of
all graphics programs. The format in many forms of BASIC is either
WIDTH “LPTl:“, 255 or WIDTH LPRINT 255. Check your software
manual for the proper format.
Printing taller patterns
The next example shows how several lines of graphics can be formed
into a figure taller than eight dots. It uses programming techniques for
producing textured or repetitive patterns.
The program is listed below. The lines inside each pair of FOR and
NEXT statements have been indented so that you can see how the
program works; the spaces are not needed for the program to run.
100 WIDTH "LPTl:", 255
110
LPRINT CHR$(27);"A";CHR$(8);
120
FOR R = 1 TO 6
130
LPRINT CHR$(27);"K";CHR$(100);CHR$(0);
140
FOR X = 1 to 50
150
LPRINT CHR$(170);CHR$(85);
160
NEXT X: LPRINT
170
NEXT R
180
LPRINT CHR$(27);"@"
If you run the program, you will see how it combines six print lines
into a pattern.
There are five basic steps that the program goes through to produce
this kind of pattern.
Graphics and User-defined Characters
5-7