Commodore Plus 4 - The Color Keys

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The BASIC Language
polygon with regular sides. For example, you can use CIRCLE to draw an
isosceles triangle.
You can draw CIRCLE shapes tilted at any angle. If you want to draw solid
shapes, you must use the PAINT command to fill in the CIRCLE outline. Unlike
the BOX command, CIRCLE has no parameter for drawing a solid shape. See
Chapter 4 for more information on CIRCLE coordinates.
Parameter
Values Default
Color source
Center coordinates
Column coordinate
High-res modes
Multicolor
Row coordinate
Column radius
High-res modes
Multicolor modes
Row radius
Arc starting angle
Arc ending angle
Angle of tilt
Segment size
0-3
0-319
0-159
0-199
0-319
0-159
0-199
0-360
0-360
0-360
0-255
1
Current pixel-cursor location
Column radius value
0
360
0
2
1. The color source indirectly selects the color for the drawing. There are five
color sources, but color source 4 (the border color) cannot be used in drawing
commands. Color sources 2 and 3 can be used only in multicolor modes.
0 screen background color
1 foreground color
2 multicolor mode extra color 1
3 multicolor mode extra color 2
The color source number you include in the CIRCLE command tells the
computer to draw in the current color for that source. For example, if you select
1, the computer draws the shape in the current foreground color. If you want to
use a color other than one of the current source values, you must first use the
COLOR command to change one of the source values. Only sources 1 and 2 can
be used to draw with more than one color on the same screen. Sources 0 and 3 are
global (whole screen) colors.
If you want to use the default value (1, the current foreground color), you do
not have to type a number, but you must type a comma before the next parameter.