Commodore Plus 4 - Page 107

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10 GRAPHIC 2,1
20 INPUT-HOW MANY SIDES'1; A
30 IF A<2 OR A>100 THEN PRINT "DON'T BE RIDICULOUS"
GOTO 20
40 CIRCLE 1,160,80,40,33,,,,360/A
50 GOTO 20
You can choose to draw only an arc instead of a whole circle.
The CIRCLE command accepts the starting and ending angles
in degrees, right after (he height number. The command CIRCLE
1,160,100.50,42,90,180 displays only the lower right section of
the circle.
To rotate an oval, add the angle of clockwise rotation after the
command, like this example- CIRCLE 1,160,100,100,20,,,30.
The usual forms of the CIRCLE command are:
COMMAND
CIRCLE on.
CIRCLE on,
CIRCLE on,
CIRCLE on,
CIRCLE on,
center column, center row,
c-col,
c-col,
c-col,
c-col,
c-row,
c-row,
c-row,
c-row.
width, height
wid, ht, start,'
width, height,
radius
inish
,.angle
wid, ht,,.,point angle
EFFECT
oval
circle/oval
arc
rotate oval
polygon
NOTE: When there are commas without numbers in a command
such as CIRCLE or BOX, the Plus/4 automatically interprets the
— comma as an input of the default value for that parameter of the
command. For example, CIRCLE,160,40.100,100 is read by the
. computer as CIRCLE 1, 160.... reading the default value of 1 for
the color source.
This next program uses the CIRCLE command for an interesting effect.
Type NEW then hit RETURN to erase the last program (rom memory
before typing in this program
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