Graphics
Read Graphics
Cursor
with
Wait Request:
Ec * 5 4 A
The
terminal
responds:
<X>, <V>,
<key
code>
<termi
nator>
where
<x>
= X coordinate
<v>
= Y coordinate
<key
code>
= Decimal value ofkey
struck
For
example,
if
you position
the
cursor
at
the
lower
left
corner of
the
screen
then
press
the
cW'
key,
the
terminal
responds:
+00000,
+00000,
065
CR
The
position bytes
are
ordered
as
in
the
read
pen
request
(Parameter
2).
The
decimal values for
ASCII
characters
are
given
in
the
Roman 8
character
set
table
in
Appendix B.
Read Display Size (Parameter=
5)
This
request
returns
the
number
ofdisplayable
units
in
the
X
and
Yaxes.
It
also
returns
the
number
of
units
per
millimeter
in
the
display. This
request
allows you to scale
data
for use on
graphics devices
with
varying
display
area
sizes.
Read Display Size Request:
Ec * 5 5 A
The
terminal
responds:
<LLX>, <LLV>,
<URX>, <URY>,
<MMX>
,
<MMY><termi
nat
or
>
Where: <LLX> ,<URX> = Lower
left
and
upper
right
X coordinates
<LL
v> ,<URV> = Lower left
and
upper
right
Y coordinates
<MMX>
,<MMY> =
Number
of
units
per
millimeter
in
the
X
and
Yaxes
(five
digits
and
a decimal point)
The
terminal
always
returns
a fixed response.The lower
left
corner
has
coordinates
ofO,O.
The
upper
right
corner
has
coordinates of511,389.There
are
approximately 2
units
per
millimeter
in
each axis.
Terminal response:
+00000,
+00000,
+00511, +00389,
00002.,
00002.
<termi
nator>
Read Device Capabilities (Parameter=
6)
The
device capabilities
request
returns
a
list
ofgraphics
and
plotting
features
available
in
the
terminal.
This
allows you to use one program for a
variety
of graphics devices.
Not
all
the
features
listed
are
available
in
the
terminal.
The absence ofa
feature
is indicated by a zero (0).
If
a
feature
is
present,
it
may
be necessaryto send
an
additional
request
to
determine
the
exact
capabilities present. Where multiple response values
are
possible,
the
terminal's
standard
response is enclosed
in
triple
stars.
Device Capability Request:
D-58
Ec * 5 6 A
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