Computer
Graphics
Operation
Manual
----------TRS-BO
®
----------
l~
VIEW
(1~,1~)-(6~~,2~~),~,1
2~
VIEW
(5~,5~)-(1~~,1~~),~,1
3~
LINE(RND(5~~),RND(19~»-(RND(5~~),RND(19~»
4~
GOTO
3~
First
you
defined
a
large
viewport
that
almost
covered
the
entire
screen.
Next
you
defined
a
smaller
viewport.
The
Random command
draws
lines
within
the
specified
parameters
but
only
the
segments
of
the
lines
that
are
within
the
parameters
of
the
smaller
viewport
are
visible
since
it
was
specified
last.
l~
VIEW(8~,8~)-(4~~,2~~),~,1
2~
VIEW(I~~,9~)-(3~~,17~),~,1
3~
VIEW(12~,I~~)-(2~~,2~~),~,1
4~
VIEW(5~,5~)-(I~~,I~~),~,1
Draws
four
viewports.
All
further
drawing
takes
place
in
the
last
viewport
specified.
l~
VIEW(21~,8~)-(42~,16~),~,1
2~
CIRCLE(3~~,12~),18~,1
3~
LINE(15,15)-(6~,6~),1
4~
CIRCLE(9~,4~),5~,1
5~
LINE(4~,3~)-(5~~,3~),1
Draws
a
viewport.
Draws
a
circle
but
only
a
portion
is
within
the
parameters
of
the
viewport.
This
circle's
centerpoint
is
relative
to
the
upper
left
corner
of
the
viewport
and
not
to
the
absolute
coordinates
of
the
graphics
Cartesian
system.
A
line
is
drawn
which
is
totally
within
the
parameters
of
the
viewport.
Another
circle
is
drawn
which
is
totally
within
the
parameters
of
the
viewport.
Another
line
is
drawn
which
is
only
partially
within
the
parameters
of
the
viewport.
l~
VIEW
(19~,7~)-(44~,18~),~,1
2~
CIRCLE
(3~~,14~),17~,1
3~
CIRCLE
(1~~,23~),4~~,1
4~
LINE
(1~,1~)-(5~~,23~),1
Draws
a
viewport.
A
circle
is
drawn
but
only
a
portion
is
within
the
parameters
of
the
viewport.
knother
circle
is
drawn
and
a
larger
portion
is
within
the
parameters
of
the
---------ItMIIOIhaeIl---------
-56-
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