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Draws a circle or ellipse on the screen.

CIRCLE [STEP] (x!,y!),radius![,[color%] [,[start!] [,[end!] [,aspect!]]]]

    ■ STEP       Specifies that coordinates are relative to the current
                 graphics cursor position.
    ■ (x!,y!)    The coordinates for the center of the circle or ellipse.
    ■ radius!    The radius of the circle or ellipse in the units of the
                 current coordinate system, determined by the most recent
                 SCREEN, VIEW, and WINDOW statements.
    ■ color%     A color attribute that sets the circle's color. The
                 available color attributes depend on your graphics adapter
                 and the screen mode set by the most recent SCREEN statement.
    ■ start!     The starting angle for the arc, in radians.
    ■ end!       The ending angle for the arc, in radians.
    ■ aspect!    The ratio of the length of the y axis to the length of the
                 x axis, used to draw ellipses.

    ■ To convert from degrees to radians, multiply degrees by (PI / 180).

Example:
    'This example requires a color graphics adapter.
    SCREEN 2
    CIRCLE (320, 100), 200
    CIRCLE STEP (0,0), 100

See Also    ◄COLOR►    ◄DRAW►    ◄LINE►    ◄SCREEN►    ◄VIEW►    ◄WINDOW►
            ◄Color Attributes and Values►    ◄Screen Modes►
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