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44 lines
1.2 KiB
GDScript
44 lines
1.2 KiB
GDScript
@icon("res://behaviours/tracker.svg")
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extends Area2D
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class_name Tracker
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## [Area2D]s tracking a certain subset of [Node2D]s.
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signal tracked(body: Node2D)
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signal untracked(body: Node2D)
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var tracking: Array = []
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## Start [field tracking] a [Node2D].
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##
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## Returns whether the body was added to the [field tracking] array.
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func track(body: Node2D) -> bool:
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var act: bool = not body in tracking
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if act:
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tracking.push_back(body)
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tracked.emit(body)
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# Handle TrackerTracker
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for tracker_tracker in body.find_children("*", "TrackerTracker", true, false):
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tracker_tracker.track_if_detected(self)
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return act
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## Stop [field tracking] a [Node2D].
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##
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## Returns whether the body was removed from the [field tracking] array.
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func untrack(body: Node2D) -> bool:
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var act: bool = body in tracking
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if act:
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tracking.erase(body)
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untracked.emit(body)
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# Handle TrackerTracker
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for tracker_tracker in body.find_children("*", "TrackerTracker", true, false):
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tracker_tracker.untrack(self)
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return act
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func log_tracked(body: Node2D) -> void:
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Log.p(self, "Tracking a new target: %s" % body)
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func log_untracked(body: Node2D) -> void:
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Log.p(self, "Not tracking anymore target: %s" % body)
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