rb_define_method (cEvasObject, "stack_below", c_stack_below, 1);
rb_define_method (cEvasObject, "above", c_above_get, 0);
rb_define_method (cEvasObject, "below", c_below_get, 0);
rb_define_method (cEvasObject, "stack_below", c_stack_below, 1);
rb_define_method (cEvasObject, "above", c_above_get, 0);
rb_define_method (cEvasObject, "below", c_below_get, 0);