'Create a new tmp anchor at the `item` (:class:`NodeItem`).'

def create_tmp_anchor(self, item):

    assert (self.tmp_anchor_point is None)
    if (self.direction == self.FROM_SOURCE):
        self.tmp_anchor_point = item.newInputAnchor()
    else:
        self.tmp_anchor_point = item.newOutputAnchor()
