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|---|
and vertical (Y) location. The screen |
is 320 points "across", and 200 points |
"high". The point at the lower left |
hand corner of the screen corresponds, |
in our X,Y format, to "0,0", while the |
upper right hand corner is "319,199" |
(we can't use x=320 or y=200; 0 to 319 |
is 320 points, and 0 to 199 is 200 |
points). |
To plot a point on the screen, all we |
have to do is say, in our program |
or from the keyboard: |
PLOT X,Y |
and that point is turned on! We can |
also plot computed locations; for |
example, |
PLOT 2*A,B+100 |
will work fine, as long as the |
computed values are within the limits |
above. By plotting points repeatedly, |
we can draw lines and graphic shapes. |
Other Notes |
----------- |
If you make an error in your commands, |
the screen will automatically switch |
back to "text". You can disable |
BASMOD by hitting RUN/STOP and |
RESTORE; if you do this, and LIST your |
program, you'll see that your special |
graphics commands are now the old ones |
we replaced! Your program won't RUN |
this way; you'll probably get a |
"syntax error" if you try. To use |
BASMOD after doing this, type: |
POKE1,PEEK(1)AND254 |
from the keyboard. Note that if you |
save your graphics program, you should |
always load and run BASMOD before |
loading your program again. Also, |
you must type in and save your program |
with BASMOD installed, or the '64 |
won't know what you're trying to say! |
-------------------------------------- |
Here's a sample program to type in |
(with BASMOD in place) and try. This |
will draw a sine wave, and the |
horizontal axis, on the screen: |
10 wipe:hue1,0:poke53280,6:screen1 |
15 rem clear, set colors, select hires |
20 fori=0to319 |
30 x=i:rem horizontal coordinate |
40 y=sin(i/20)*100+100:rem vert coord |
50 plotx,y:plotx,100 |
55 rem plot point, mark horiz axis |
60 next:rem do the next point |
70 geta$:ifa$=""then70:rem finished |
80 screen0:end |
90 rem return to text mode |
-------------------------------------- |
Hope you'll enjoy using BASMOD; if you |
have questions, please be sure to ask! |
SYSOP/Dave Paul |
70007,1052 |
(1) (c)COMPUTE! Publications, Inc. |
From Commodore Magazine, 10-11/82 |
Jim Butterfield--C'64 Map |
(partial reproduction--BASIC ROM only) |
a000; rom control vectors |
a00c; keyword action vectors |
a052; function vectors |
a080; operator vectors |
a09e; keywords |
a19e; error messages |
a328; error message vectors |
a365; misc messages |
a38a; scan stack for for/gosub |
a3b8; move memory |
a3fb; check stack depth |
a408; check memory space |
a435; "out of memory" |
a437; error routines |
a469; break entry |
a474; "ready." |
a480; ready for basic |
a49c; handle new line |
a533; rechain lines |
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