Apple IIe - Graphics Commands: GR, PLOT, HGR, HPLOT

Apple
BASIC Reference
Guide
107
•
Applesoft
GR
•
Integer
The GR statement sets and
clears
the
low
resolution
screen
mode
(40x40
with
4
lines
~
f
text
at
the
bottom
of
the
screen).
Configuration
GR
This statement
should
be
executed
before
the
graphics state-
ments PLOT,
HLIN
..
AT, and
VLIN
..
AT
are used.
When
the
GR
statement
is
executed,
the
color
is
automatically
set
to
0
(BLACK).
Example
10 GR
20
COLOR
=15
30
PLOT
19,
23
40
END
The
preceding
example
should
put
a
white
square
on
the
screen.
If
line
10 was
omitted
, a
zero
would
be
placed
in
the
middle
of
the
screen, because
the
low-resolution
mode
was
not
set.
If
you
wish
to
return
to
the
normal
mode
,
you
can
do
so by
executing
the
TEXT
statement.
If
full-screen
graphics
(40x48)
is
desired, this can
be
accomplished
by
executing
POKE -16302,0
after
GR
has
been
executed.
POKE
- 16301,0
can be used
to
restore
the
text
window
.
HCOLOR
•
Applesoft
o
Integer
The
HCOLOR
statement
defines
the
next
color
to
be
displayed