gd: added input addon

addons/guide/inputs/guide_input_touch_axis_base.gd

@@ -0,0 +1,49 @@
+## Base class for axis-like touch input.
+@tool
+class_name GUIDEInputTouchAxisBase
+extends GUIDEInputTouchBase
+
+var _last_position:Vector2 = Vector2.INF
+
+# We use the reset call to calculate the position for this frame
+# so it can serve as reference for the next frame
+func _needs_reset() -> bool:
+	return true
+
+func _reset() -> void:
+	_last_position = _state.get_finger_position(finger_index, finger_count)
+	_apply_value(_calculate_value(_last_position))
+
+func _begin_usage() -> void:
+	# subscribe to relevant input events	
+	_state.touch_state_changed.connect(_refresh)
+	_refresh()
+
+func _end_usage() -> void:
+	# unsubscribe from input events
+	_state.touch_state_changed.disconnect(_refresh)
+	
+func _refresh() -> void:
+	# calculate live position from the cache
+	var new_position:Vector2 = _state.get_finger_position(finger_index, finger_count)
+
+	_apply_value(_calculate_value(new_position))
+
+func _apply_value(value:Vector2):
+	pass	
+			
+func _calculate_value(new_position:Vector2) -> Vector2:
+	# if we cannot calculate a delta because old or new position
+	# are undefined, we say the delta is zero	
+	if not _last_position.is_finite() or not new_position.is_finite():
+		return Vector2.ZERO
+	
+	return new_position - _last_position
+
+		
+func is_same_as(other:GUIDEInput):
+	return other is GUIDEInputTouchAxis2D and \
+		other.finger_count == finger_count and \
+		other.finger_index == finger_index
+
+