Adds enemies

demo/ai/tasks/in_range.gd

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+#*
+#* in_range.gd
+#* =============================================================================
+#* Copyright (c) 2023-present Serhii Snitsaruk and the LimboAI contributors.
+#*
+#* Use of this source code is governed by an MIT-style
+#* license that can be found in the LICENSE file or at
+#* https://opensource.org/licenses/MIT.
+#* =============================================================================
+#*
+@tool
+extends BTCondition
+## InRange condition checks if the agent is within a range of target,
+## defined by [member distance_min] and [member distance_max]. [br]
+## Returns [code]SUCCESS[/code] if the agent is within the given range;
+## otherwise, returns [code]FAILURE[/code].
+
+## Minimum distance to target.
+@export var distance_min: float
+
+## Maximum distance to target.
+@export var distance_max: float
+
+## Blackboard variable that holds the target (expecting Node2D).
+@export var target_var: StringName = &"target"
+
+var _min_distance_squared: float
+var _max_distance_squared: float
+
+
+# Called to generate a display name for the task.
+func _generate_name() -> String:
+	return "InRange (%d, %d) of %s" % [distance_min, distance_max,
+		LimboUtility.decorate_var(target_var)]
+
+
+# Called to initialize the task.
+func _setup() -> void:
+	## Small performace optimization
+	_min_distance_squared = distance_min * distance_min
+	_max_distance_squared = distance_max * distance_max
+
+
+# Called when the task is executed.
+func _tick(_delta: float) -> Status:
+	var target: Node2D = blackboard.get_var(target_var, null)
+	if not is_instance_valid(target):
+		return FAILURE
+
+	var dist_sq: float = agent.global_position.distance_squared_to(target.global_position)
+	if dist_sq >= _min_distance_squared and dist_sq <= _max_distance_squared:
+		return SUCCESS
+	else:
+		return FAILURE