73 lines
1.9 KiB
GDScript
73 lines
1.9 KiB
GDScript
## Input representing the distance changes between two fingers.
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@tool
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class_name GUIDEInputTouchDistance
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extends GUIDEInput
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const GUIDETouchState = preload("guide_touch_state.gd")
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var _initial_distance:float = INF
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# We use the reset call to calculate the distance for this frame
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# so it can serve as reference for the next frame
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func _needs_reset() -> bool:
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return true
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func _reset():
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var distance = _calculate_distance()
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# update initial distance when input is actuated or stops being actuated
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if is_finite(_initial_distance) != is_finite(distance):
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_initial_distance = distance
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func _input(event:InputEvent) -> void:
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if not GUIDETouchState.process_input_event(event):
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# not touch-related
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return
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var distance := _calculate_distance()
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# if either current distance or initial distance is not set,
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# we are zero
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if not is_finite(distance) or not is_finite(_initial_distance):
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_value = Vector3.ZERO
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return
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# we assume that _initial_distance is never 0 because
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# you cannot have two fingers physically at the same place
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# on a touch screen
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_value = Vector3(distance / _initial_distance, 0, 0)
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func _calculate_distance() -> float:
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var pos1:Vector2 = GUIDETouchState.get_finger_position(0, 2)
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# if we have no position for first finger, we can immediately abort
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if not pos1.is_finite():
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return INF
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var pos2:Vector2 = GUIDETouchState.get_finger_position(1, 2)
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# if there is no second finger, we can abort as well
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if not pos2.is_finite():
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return INF
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# calculate distance for the fingers
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return pos1.distance_to(pos2)
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func is_same_as(other:GUIDEInput):
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return other is GUIDEInputTouchDistance
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func _to_string():
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return "(GUIDEInputTouchDistance)"
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func _editor_name() -> String:
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return "Touch Distance"
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func _editor_description() -> String:
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return "Distance of two touching fingers."
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func _native_value_type() -> GUIDEAction.GUIDEActionValueType:
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return GUIDEAction.GUIDEActionValueType.AXIS_1D
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