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

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