Epson LX-90 User Manual - Parallel 8620 PIC for LX-90 - Page 60

Width Statements, Multiple-Line Exercise, WIDTH LPRINT 255, LPRINT CHR$27KCHR$100CHR$0

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WIDTH Statements Some software (including IBM Personal Computer BASIC) automatically inserts the control codes for a carriage return and a line feed after every 80 - 130 characters. This insertion is usually no problem with text, but it can spoil your graphics. In the graphics mode it may insert the control codes in the middle of a line. You can usually prevent these unwanted control codes with a WIDTH statement. One format is shown below. Consult your software manual to find the proper format for your system. WIDTH LPRINT 255 Put a WIDTH statement in one of the first lines of all your graphics programs. It is easier to put a WIDTH statement in all of your programs than to examine each one to see whether or not such a statement is necessary. Multiple-Line Exercise Now that you've entered and run a simple graphics program, you can go on to an exercise that shows you how the LX-90 combines several lines of graphics for a figure taller than eight dots. Start with a line for 100 columns of single-density graphics and lines to print two pin patterns. Notice that since there are two pin patterns in the loop, it is only executed 50 times. NEW 10 WIDTH LPRINT 255 40 LPRINT CHR$(27)"K"CHR$(100)CHR$(0); 50 FOR X=1 TO 50: LPRINT CHR$(85)CHR$(42); 60 NEXT X: LPRINT 100 LPRINT CHR$(27)"@" If you run the program now, you'll see how one line of the pattern looks: To see how more than one line combines to form a figure, enter and run the following program, which uses the lines you have already typed and adds several more. 58

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WIDTH Statements
Some software (including IBM Personal Computer BASIC) auto-
matically inserts the control codes for a carriage return and a line feed
after every 80 -
130
characters. This insertion is usually no problem
with text, but it can spoil your graphics. In the graphics mode it may
insert the control codes in the middle of a line.
You can usually prevent these unwanted control codes with a
WIDTH statement. One format is shown below. Consult your soft-
ware manual to find the proper format for your system.
WIDTH LPRINT 255
Put a WIDTH statement in one of the first lines of all your graphics
programs. It is easier to put a WIDTH statement in all of your pro-
grams than to examine each one to see whether or not such a state-
ment is necessary.
Multiple-Line Exercise
Now that you’ve entered and run a simple graphics program, you
can go on to an exercise that shows you how the LX-90 combines
several lines of graphics for a figure taller than eight dots.
Start with a line for
100
columns of single-density graphics and lines
to print two pin patterns. Notice that since there are two pin patterns
in the loop, it is only executed 50 times.
NEW
10 WIDTH LPRINT 255
40
LPRINT CHR$(27)"K"CHR$(100)CHR$(0);
50 FOR X=1 TO 50: LPRINT CHR$(85)CHR$(42);
60 NEXT X: LPRINT
100 LPRINT CHR$(27)"@"
If you run the program now, you’ll see how one line of the pattern
looks:
To see how more than one line combines to form a figure, enter and
run the following program, which uses the lines you have already
typed and adds several more.
58