JonShard
104 lines
3.2 KiB
GDScript
104 lines
3.2 KiB
GDScript
class_name CombineZone
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extends Area3D
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## Trigger area that lets a snapped item combine with another item pushed into
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## it. The zone only monitors while its owning item is held by an
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## [XRToolsSnapZone]; when an item carrying a matching [CombinableItem.id]
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## enters, the snapped (base) item transforms into the recipe result and the
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## incoming item is consumed.
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# The pickable this zone belongs to (its parent).
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@onready var _item: XRToolsPickable = get_parent().get_parent() as XRToolsPickable
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# The base item's recipe data.
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@onready var _combinable: CombinableItem = _find_combinable(_item)
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# Guard so a combine only fires once.
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var _combining: bool = false
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func _ready() -> void:
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# Detect items whether held (layer 17 "Held Objects") or loose
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# (layer 3 "Pickable Objects"). Don't advertise a layer of our own.
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collision_mask = 0b0000_0000_0000_0001_0000_0000_0000_0100
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collision_layer = 0
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# Deferred: _ready can run during a physics signal flush (when a combine
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# spawns the result), where toggling monitoring directly is forbidden.
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set_deferred("monitoring", false)
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set_deferred("monitorable", false)
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if not _item:
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push_error("CombineZone must be a grand child of an XRToolsPickable.")
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return
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if not _combinable:
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push_error("CombineZone requires a CombinableItem sibling on ", _item.name, ".")
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return
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_item.picked_up.connect(_on_item_picked_up)
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_item.dropped.connect(_on_item_dropped)
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body_entered.connect(_on_body_entered)
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# Enable the trigger only while snapped into a snap zone (not hand-held).
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func _on_item_picked_up(_pickable: Node3D) -> void:
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var by := _item.get_picked_up_by()
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var snapped: bool = by != null and by.has_method("is_xr_class") and by.is_xr_class("XRToolsSnapZone")
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set_deferred("monitoring", snapped)
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func _on_item_dropped(_pickable: Node3D) -> void:
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set_deferred("monitoring", false)
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func _on_body_entered(body: Node3D) -> void:
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if _combining or body == _item:
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return
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var other := _find_combinable(body)
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if not other:
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return
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var result: PackedScene = _combinable.get_result_for(other.id)
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if not result:
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return
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_combine(body, result)
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# Transform the base item into [param result], consuming the incoming item.
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func _combine(other_body: Node3D, result: PackedScene) -> void:
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_combining = true
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var snap_zone := _item.get_picked_up_by()
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if not snap_zone or not snap_zone.has_method("pick_up_object"):
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push_warning("CombineZone: base item is not held by a snap zone; cannot combine.")
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_combining = false
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return
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# Spawn the result at the base item's location, in world space.
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var base_transform := _item.global_transform
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var result_instance: Node3D = result.instantiate()
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_item.get_tree().current_scene.add_child(result_instance)
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result_instance.global_transform = base_transform
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# Free the base item and consume the incoming item.
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snap_zone.drop_object()
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_item.queue_free()
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if other_body.has_method("drop_and_free"):
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other_body.drop_and_free()
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else:
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other_body.queue_free()
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# Snap the result into the now-empty zone.
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snap_zone.pick_up_object(result_instance)
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# Find a CombinableItem among the direct children of [param node].
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func _find_combinable(node: Node) -> CombinableItem:
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if not node:
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return null
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for child in node.get_children():
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if child is CombinableItem:
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return child
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return null
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