Apple IIe - Page 227

Apple lie Graphics 227
Table 6-1 Color Numbers.
0- black 8- brown
1-
magenta
9-
orange
2- dark blue 10-
grey
3- purple 11 - pink
4- dark green 12- green
5-
gre y 13- yellow
6- medium blue 14-
aqua
7-
light blue 15-
white
After a COLOR has been selected , information can be plotted
to the screen. This is accomplished by using the PLOT command.
The correct syntax of this command is as follows :
PLOT
x,y
x is the column number. y is the row number . The column
numbers extend from 0 (left) to 39 (right) . The row numbers
extend from 0 (top) to 47 (bottom). For example the following
program plots two orange squares in the upper righthand corner
of the screen.
10 GR
-
set low resolution mode
20 COLOR =9
-
select ORANGE = 9
30 PLOT 39,1
-
plot first square
40 PLOT 38,0
-
plot second square
If a graphics & text format is being displayed, plotting to a row
number between 40 and 47 will cause a character to be displayed
at that location.
VLIN and HLIN can be used to plot consecutive pixels. VLIN and
HLIN are abbreviations for Vertical LINe and Horizontal LINe
respectively. The correct syntax for the VLIN command is as
follows :
VLIN
y,,y
2
AT x