Computer
Graphics
Operation
Manual
-----------TRS·BO
®
----------
Sample
Program
919191191
C
DRAW
TWO
INTERSECTING CIRCLES
919191291
CALL
GRPINI
(l
>
919191391
CALL
CLS
919191491
CALL
SETXY(19l9l,19l9l>
919191591
CALL
CIRCLE(591,1,91.91,91.91,91.91>
919191691
C
DRAW
SECOND
CIRCLE
WITH
CENTER
291
919191791
C
PIXELS
TO
THE
RIGHT
OF
FIRST CIRCLE
919191891
CALL
SETXYR(291,91>
919191991
CALL
CIRCLE(591,1,91.91,91.91,91.91>
919119191
END
VIEW
Sets
Viewport
VIEW
draws
viewports
on
your
screen.
Graphics
is
displayed
only
in
the
last
defined
viewport.
The
upper-left
corner
of
viewport
is
read
as
(91,91>
(the
"relative
origin">
when
creating
items
inside
the
viewport.
All
the
other
coordinates
are
read
relative
to
this
origin.
However,
the
"absolute
coordinates"
of
the
viewport,
as
they
are
actually
defined
on
the
Graphics
Cartesian
system,
are
retained
in
memory
and
can
be
read
using
VIEW
as
a
function.
---------Itadlelhaell---------
-1191-
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