Table of Contents
Advertisement
Line Spacing and Forms Control
85
In both cases the value of n tells Radix how many lines to skip,
although there is a slight difference in the usage. When you set the
top margin with (ESC) "I?' CHR$(n), the value of n tells Radix
what line to start printing on. When you set the bottom margin
with (ESC) "N" CHR$(n), the value of n tells Radix how many
blank lines should be left at the bottom of the page.
Let's try a simple application to see how these margins work.
Enter this program, which will print 150 lines without top and
bottom margins.
10 'Demo top and bottom margins.
20 LPRINT CHR$(12) ; 'Form feed.
30
FOR I = 1
To
150
40
LPRINT "This is line" I
50 NEXT I
60
LPRINT CHR$(12) ; 'Form feed.
When you run this program it will print 150 lines right down
the page and across the perforations. When it's done line 60 sends
a form feed to advance the paper to the top of the next page. Look
at the lines that have printed near the perforations. Separate the
sheets and see if any of the lines have been torn in half. These are
the problems that the top and bottom margins will solve.
Now add the following lines to your program. (Don't forget
the semicolons or you won't get quite the same results that we
did.)
11 'Leave 6 blank lines at bottom of page.
12 LPRINT CHR$(27) "N" CHR$(
6)
;
13 'Start top of page at line
6.
14
LPRINT CHR$(27) "R" CHR$(
6)
;
55
LPRINT CHR$(27) "0" ; 'Clear top & bottom margins.
Now when you run the program Radix will skip the first six
lines and the last six lines on each page. Always send a form feed
after setting the top margin, or it will not work on the first page
printed. That's because the top margin only takes effect after a
form feed.
Line 14 sets the top margin, line 12 sets the bottom margin,
and line 55 clears both margins when we are done.
Advertisement
Table of Contents
