feat(xray): add XRayMachine component with plate slide-in animation

scenes/objects/XRayMachine.tscn

@@ -0,0 +1,34 @@
+[gd_scene load_steps=2 format=3 uid="uid://cozypaw_xraymachine"]
+
+[ext_resource type="Script" path="res://scripts/objects/xray_machine.gd" id="1_xraymachine"]
+
+[node name="XRayMachine" type="Node2D"]
+script = ExtResource("1_xraymachine")
+
+[node name="MachineBody" type="ColorRect" parent="."]
+color = Color(0.68, 0.70, 0.76, 1)
+size = Vector2(80, 200)
+position = Vector2(-40, -200)
+
+[node name="MachineArm" type="ColorRect" parent="."]
+color = Color(0.62, 0.64, 0.70, 1)
+size = Vector2(220, 24)
+position = Vector2(-40, -180)
+
+[node name="ViewerFrame" type="ColorRect" parent="."]
+color = Color(0.20, 0.22, 0.26, 1)
+size = Vector2(80, 60)
+position = Vector2(-40, -195)
+
+[node name="Viewer" type="ColorRect" parent="."]
+color = Color(0.06, 0.08, 0.12, 1)
+size = Vector2(66, 46)
+position = Vector2(-33, -189)
+
+[node name="Plate" type="Node2D" parent="."]
+position = Vector2(-50, 20)
+
+[node name="PlateBody" type="ColorRect" parent="Plate"]
+color = Color(0.28, 0.32, 0.38, 1)
+size = Vector2(200, 14)
+position = Vector2(0, -7)

scripts/objects/xray_machine.gd

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+## XRayMachine — X-ray plate slides out when tapped; viewer lights up during exposure.
+class_name XRayMachine extends Node2D
+
+enum State { IDLE, SLIDING_IN, EXPOSING, SLIDING_OUT }
+
+const SLIDE_DURATION: float = 0.8
+const EXPOSE_DURATION: float = 1.5
+const BUTTON_HALF_WIDTH: float = 50.0
+const BUTTON_HALF_HEIGHT: float = 100.0
+const PLATE_PARKED_X: float = -50.0
+const PLATE_ACTIVE_X: float = 130.0
+const VIEWER_LIT_COLOR: Color = Color(0.75, 0.90, 1.0, 1)
+const VIEWER_DARK_COLOR: Color = Color(0.06, 0.08, 0.12, 1)
+
+var _state: State = State.IDLE
+
+
+func _ready() -> void:
+	var plate: Node2D = get_node_or_null("Plate") as Node2D
+	if plate != null:
+		plate.position.x = PLATE_PARKED_X
+
+
+func _input(event: InputEvent) -> void:
+	if _state != State.IDLE:
+		return
+	var screen_pos: Vector2
+	if event is InputEventScreenTouch and event.pressed:
+		screen_pos = event.position
+	elif event is InputEventMouseButton and event.pressed and event.button_index == MOUSE_BUTTON_LEFT:
+		screen_pos = event.position
+	else:
+		return
+	var canvas_transform: Transform2D = get_viewport().get_canvas_transform()
+	var world_pos: Vector2 = canvas_transform.affine_inverse() * screen_pos
+	var local_pos: Vector2 = to_local(world_pos)
+	if abs(local_pos.x) <= BUTTON_HALF_WIDTH and abs(local_pos.y) <= BUTTON_HALF_HEIGHT:
+		_start_scan()
+
+
+func _start_scan() -> void:
+	_state = State.SLIDING_IN
+	var plate: Node2D = get_node_or_null("Plate") as Node2D
+	if plate == null:
+		_state = State.IDLE
+		return
+	var tween: Tween = create_tween()
+	tween.set_ease(Tween.EASE_IN_OUT)
+	tween.set_trans(Tween.TRANS_QUAD)
+	tween.tween_property(plate, "position:x", PLATE_ACTIVE_X, SLIDE_DURATION)
+	tween.finished.connect(_on_plate_in)
+
+
+func _on_plate_in() -> void:
+	_state = State.EXPOSING
+	var viewer: ColorRect = get_node_or_null("Viewer") as ColorRect
+	if viewer != null:
+		viewer.color = VIEWER_LIT_COLOR
+	var timer: SceneTreeTimer = get_tree().create_timer(EXPOSE_DURATION)
+	timer.timeout.connect(_start_slide_out)
+
+
+func _start_slide_out() -> void:
+	_state = State.SLIDING_OUT
+	var viewer: ColorRect = get_node_or_null("Viewer") as ColorRect
+	if viewer != null:
+		viewer.color = VIEWER_DARK_COLOR
+	var plate: Node2D = get_node_or_null("Plate") as Node2D
+	if plate == null:
+		_state = State.IDLE
+		return
+	var tween: Tween = create_tween()
+	tween.set_ease(Tween.EASE_IN_OUT)
+	tween.set_trans(Tween.TRANS_QUAD)
+	tween.tween_property(plate, "position:x", PLATE_PARKED_X, SLIDE_DURATION)
+	tween.finished.connect(func() -> void: _state = State.IDLE)