EraseOval
EraseOval Fill oval with background pattern
#include <Quickdraw.h> Quickdraw
void EraseOval(theRect );
Rect *theRect ; rectangle defining oval's position and size
EraseOval fills an oval, positioned just inside of a rectangular, area with
the background pattern of the current GrafPort.
theRect is the address of an 8-byte Rect structure, in local coordinates.
Returns: none

Notes: EraseOval is functionally equivalent to:
FillOval( & theRect, thePort->bkPat );
The pen position is not changed by this function.
As with all Quickdraw drawing, the output is clipped to the intersection of
the current GrafPort's bitMap boundary rectangle, the port rectangle,
clipping region, and visible region.