NAME
    AreaCircle -- add a circle to areainfo list for areafill.


SYNOPSIS
    error = (int) AreaCircle( rp,  cx,  cy, radius)
    D0                        A1   D0   D1  D2

    ULONG AreaCircle(struct rastport *, word, word, uword);

FUNCTION
    Add circle to the vector buffer. It will be drawn to the rastport when
    areaend is executed.

INPUTS
    rp       - pointer to a rastport structure

    cx, cy   - the coordinates of the center of the desired circle.

    radius   - is the radius of the circle to draw around the centerpoint.

RESULTS
    0 if no error
    -1 if no space left in vector list

NOTES
    This function is actually a macro which calls
        AreaEllipse(rp,cx,cy,radius,radius).

SEE ALSO
    areamove() areadraw() areacircle() initarea() areaend()
    graphics/rastport.h graphics/gfxmacros.h