65 lines
2.2 KiB
GDScript3
65 lines
2.2 KiB
GDScript3
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class_name EnemyTargets
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extends RefCounted
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# #101 (#97c): who a wave enemy is coming for.
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#
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# Before this, every enemy component asked the same question - "which player
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# SHIP is nearest?" - and a structure was scenery they flew straight past.
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# #97 makes waves go after what the player has built, so the question
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# becomes "which player thing is nearest", asked in one place so pursuit,
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# standoff, the lancer's lunge and the ranged weapon cannot drift into
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# disagreeing about it.
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#
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# There is one thumb on the scale. A ship inside SHIP_PRIORITY_RANGE always
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# wins, even if a building is nearer: an enemy that ignored the vessels
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# shooting it in order to reach a depot two hundred pixels closer would read
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# as broken, and would make the fleet unable to defend anything by
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# interposing itself.
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const SHIP_PRIORITY_RANGE: float = 520.0
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static func nearest_ship(node: Node, from: Vector2) -> Node2D:
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var fleet: Node2D = node.get_tree().get_first_node_in_group("player_fleet")
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if fleet == null:
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return null
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var nearest: Node2D = null
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var best: float = INF
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for ship in fleet.ships:
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if not is_instance_valid(ship):
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continue
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var d: float = from.distance_to(ship.global_position)
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if d < best:
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best = d
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nearest = ship
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return nearest
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static func nearest_building(node: Node, from: Vector2) -> Node2D:
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var nearest: Node2D = null
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var best: float = INF
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for building in node.get_tree().get_nodes_in_group("buildings"):
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if not is_instance_valid(building) or building.is_queued_for_deletion():
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continue
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var d: float = from.distance_to(building.global_position)
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if d < best:
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best = d
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nearest = building
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return nearest
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static func nearest_target(node: Node, from: Vector2) -> Node2D:
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var ship: Node2D = nearest_ship(node, from)
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if ship != null and from.distance_to(ship.global_position) <= SHIP_PRIORITY_RANGE:
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return ship
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var building: Node2D = nearest_building(node, from)
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if building == null:
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return ship
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if ship == null:
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return building
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return ship if from.distance_to(ship.global_position) \
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<= from.distance_to(building.global_position) else building
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static func is_building(target: Node) -> bool:
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return target != null and target.is_in_group("buildings")
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