def delta(self):
		"""The delta between the last event and the current event.

		If the tool employs pointer acceleration, the delta contained in this
		property is the accelerated delta.

		This value is in screen coordinate space, the delta is to be
		interpreted like the value of :attr:`.PointerEvent.delta`.
		See `Relative motion for tablet tools`_ for more details.

		Returns:
			(float, float): The relative (x, y) movement since the last event.
		"""

		delta_x = self._libinput.libinput_event_tablet_tool_get_dx(self._handle)
		delta_y = self._libinput.libinput_event_tablet_tool_get_dy(self._handle)
		return delta_x, delta_y