def arc(self, gc, x, y, width, height, angle1, angle2, onerror=None):
request.PolyArc(display=self.display,
onerror=onerror,
drawable=self.id,
gc=gc,
arcs=[(x, y, width, height, angle1, angle2)])
def poly_arc(self, gc, arcs, onerror=None):
request.PolyArc(display=self.display,
onerror=onerror,
drawable=self.id,
gc=gc,
arcs=arcs)
