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45 lines
1.3 KiB
GDScript
45 lines
1.3 KiB
GDScript
extends Node
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class_name OverlapChecker
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## Layers to consider when checking overlap with [PhysicBody2D].
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@export_flags_2d_physics var overlap_mask: int
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## Whether [TileMap]s should be considered in collisions or not.
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##
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## Their [collision_layer]s are always ignored.
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@export var overlap_with_tilemap: bool = true
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## The [Area2D] this script should act on.
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@onready var target: Area2D = get_parent()
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## What the [target] object is currently overlapping with.
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var is_overlapping_with: Node2D = null
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## Get the first body overlapping the [target].
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func get_first_overlapping_body() -> Node2D:
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for body in target.get_overlapping_bodies():
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if body is TileMap:
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if overlap_with_tilemap:
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return body
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elif body is PhysicsBody2D:
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if body.collision_layer & overlap_mask:
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return body
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return null
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## Update the [is_overlapping_with] variable.
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func _update_is_overlapping_with() -> void:
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var current_overlap = get_first_overlapping_body()
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if current_overlap != is_overlapping_with:
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overlap_changing.emit(current_overlap)
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is_overlapping_with = current_overlap
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## Emitted when the value of [is_overlapping_with] changes because of [_update_is_overlapping_with].
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signal overlap_changing(to: Node2D)
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## Calculate overlap on every physics frame.
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func _physics_process(_delta):
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_update_is_overlapping_with()
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