Subtracts the given polygon from the collection of polygons
the receiver maintains to describe its area.
@param pointArray points that describe the polygon to merge with the receiver
@exception IllegalArgumentException <ul>
<li>ERROR_NULL_ARGUMENT - if the argument is null</li>
</ul>
@exception SWTException <ul>
<li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
</ul>
Subtracts the given polygon from the collection of polygons the receiver maintains to describe its area.
@param pointArray points that describe the polygon to merge with the receiver
@exception IllegalArgumentException <ul> <li>ERROR_NULL_ARGUMENT - if the argument is null</li> </ul> @exception SWTException <ul> <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> </ul>
@since 3.0