where:
Set
Drawing
Mode:
<paramet
er)
is
Ec * m
<parameter)
a
Graphics
o = no effect
1 =
Clear
(turn
off graphics bits)
2 =
Set
(turn
on graphics bits)
3 = Complement (toggle
the
graphics bits)
4 =
Jam
(turn
bits
on or off according to
the
data)
CLEAR
MODE.
Clear
mode causes selected display bits to be
turned
off.
The
«(selected bits"
are
those
that
are
(on"
in
the
line
pattern.
If
a solid line
type
(thedefault)
has
beenselected, all
of
the
bits
in
a vector will be selected.
In
clear
mode
this
means
that
all
of
the
dots
making
up
a
vector will be
turned
off.
This allows you to
draw
dark
vectors on a
white
background. Only
those
bits
that
are
on
in
the
pattern
are
cleared. Bits
that
are
off
in
the
pattern
do
not
affect
the
display.
SET
MODE.
Set
mode
is
similar
to
clear
mode except
that
the
selected
bits
are
turned
on
instead
of
off.
Only
the
bits
that
are
on
in
the
line
type
are
affected.
COMPLEMENT
MODE. Complement mode causes
the
selected display
bits
to
change
state
(on to
off,
offto on).
Again
only those
bits
that
are
on
in
the
line
type
or
pattern
are
affected.
JAM
MODE.
Jam
mode differs from
the
other
modes
in
that
both
the
bits
that
are
on
in
the
line
type
or
pattern
and
the
bits
in
the
pattern
that
are
offaffect
the
display.
Jam
mode
has
the
effect
of
overlaying
the
display
with
the
pattern.
SELECTIVE
ERASE.A
vector
drawn
in
set
mode
can
beselectively
erased
by
redrawing
it
in
clear
mode.
This
will
cause
gaps
to occur
if
the
erased line
is
intersected
by
other
lines.
This
problem
can
be overcome
by
initially
drawing
the
line
in
complement mode
and
then
redraw-
ing
it
in
complement mode to
erase
the
line. This technique will
preserve
the
original
display.
Complement mode
is
useful for
drawing
and
erasing
temporary
figures.
Examp 1
e:
Select complement mode,
draw
a vector,
and
then
erase
the
vector by redrawing.
Ec * m 3A (select complement mode)
Ec * p a f
100,300
300,3002
(draw vector)
Ec * p a f
100,300
300,3002
(erase vector)
Drawing Patterns
You
can
select
the
dot
pattern
used
when
drawing
vectors or filling
rectangular
areas.
Dotted
and
dashed
lines
can
be
drawn
by selecting one
of
nine
predefined
line
patterns
or
a
user
defined line
or
area
pattern.
This
allows you to use different
line
patterns
to
distinguish
between groups of plotted
data
or
easily
generate
shading
and
cross
hatching
for use
in
engineering
drawings,
graphs
or fabric
patterns.
D-ll
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