Apple IIe - Page 234

234 Apple lie Users Handbook
High resolution graphics has a single command that can be used
to output data to the screen. HPLOT is more flexible than PLOT,
HLIN, and VLIN combined . In HPLOT's simplest form, it func-
tions as low resolution 's PLOT command.
HPLOT x ,y
x is the column number . y is the row number . The column
numbers extended from 0 to 279. The row numbers extend from
0 to 191. The computer stores the column number and row
number of the last plotted coordinate .
The
next form of the command is as follows:
HPLOT TO x,y
The computer executes this command by drawing a straight line
from the last plotted point to the point with coordinates (x,y).
The
line color will be the last color selected by the HCOLOR
command. These two versions of the HPLOT command may be
combined as follows:
This command will cause a line to be drawn from screen coordi-
nate (x
1
,y
1
)
to screen coordinate (x
2
,y
2
) .
x
2
and y
2
will be stored
as the last plotted coordinate.
The reserved word TO may appear more than once in a single
HPLOT
command. '
HPLOT
1,1 TO 20,100 TO 200,30
The previous command will initially cause a line to be drawn
from 1, 1) to (20,100). A second line will then be drawn from
(20, 1(1J) to (200,30). Finally, the value 200 will be stored as the
column number , and the value 30 will be stored as the row
1 umber .