Atari 65XE, Owner'S Manual

Page: 81 / 135

The smaller the pixels, the higher the resolution. Of the three modes,
mode 3 is the lowest and mode 7 is the highest. Try drawing a rec-
tangle around the screen borders in modes 5 and 7.
The following program illustrates all that you have tried in this section.
Type it in and run it:
NEW
5 REM ** BILL'S BOX (PLOT AND D R A W )
10 PRINT "WHICH MODE (3,5, OR 7)";
20 LEFT=0:TOP=0
30 INPUT MODE
40 IF MODE = 3 THEN RIGHT=39:BOTTOM=19
50 IF MODE=5 THEN RIGHT=79:BOTTOM=39
6O IF MODE=7 THEN RIGHT=159 : BOTTOM=79
70 GRAPHICS MODE
80 PRINT" GRAPHICS M O D E " ; M O D E
90 FOR COUNT=1 TO 1000
100 COLOR 2
110 TRAP 240
115 REM ** DRAW BOX
120 PLOT LEFT,TOP
130 COLOR 1
140 DRAWTO R I G H T , T O P
150 COLOR 2
160 DRAWTO R I G H T , B O T T O M
170 COLOR 1
180 DRAWTO L E F T , B O T T O M
190 COLOR 3
200 DRAWTO L E F T , T O P
205 REM ** DELAY LOOP
210 FOR DELAY=1 TO 5 0 0 : N E X T DELAY
215 REM ** SIZE OF NEXT BOX
220 LEFT=LEFT + 2:TOP=TOP + 2:RIGHT=RIGHT-2:BOTTOM=BOTTOM-2
230 NEXT COUNT
240 PRINT" THAT'S ALL FOLKS!"
250 END
Try using SETCOLOR to change the colors in the Bill's Box program.
You can learn a great deal more about ATARI graphics, including how
to use other graphics modes and create animated characters. Refer to
Appendix F: Resources to locate books, magazines, and users groups
that can help you further explore the world of ATARI BASIC and your
ATARI 65XE Computer.
76