wxMacCGContext* mctx = ((wxMacCGContext*) m_graphicContext) ;
CGContextRef ctx = mctx->GetNativeContext() ;
AddEllipticArcToPath( ctx , CGPointMake( xxc , yyc ) , rad , rad , 0 , 180 ) ;
wxMacCGContext* mctx = ((wxMacCGContext*) m_graphicContext) ;
CGContextRef ctx = mctx->GetNativeContext() ;
AddEllipticArcToPath( ctx , CGPointMake( xxc , yyc ) , rad , rad , 0 , 180 ) ;