73 lines
2.0 KiB
GDScript
73 lines
2.0 KiB
GDScript
extends MeshInstance3D
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class_name TrainBody
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signal speed_changed(new_speed: float)
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signal rail_switched(old_rail: Path3D, new_rail: Path3D)
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@export_group("Train")
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@export var base_speed: float = 15.0
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@export var max_speed: float = 50.0
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@export var min_speed: float = 3.0
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@export var acceleration: float = 12.0
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@onready var rail_a: Path3D = $"../Rails1"
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@onready var rail_b: Path3D = $"../Rails2"
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var current_follower: PathFollow3D
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var current_rail: Path3D
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var current_speed: float = 15.0
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func _ready() -> void:
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current_speed = base_speed
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switch_to_rail(rail_a)
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func _process(delta: float) -> void:
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_handle_input(delta)
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current_follower.progress += current_speed * delta
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global_transform = current_follower.global_transform
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func _handle_input(delta: float) -> void:
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if Input.is_action_pressed("speed_up"):
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current_speed = min(current_speed + acceleration * delta, max_speed)
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speed_changed.emit(current_speed)
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elif Input.is_action_pressed("speed_down"):
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current_speed = max(current_speed - acceleration * delta, min_speed)
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speed_changed.emit(current_speed)
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func get_speed() -> float:
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return current_speed
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func switch_to_rail(new_rail: Path3D) -> void:
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if new_rail == current_rail:
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return
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current_rail = new_rail
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current_follower = new_rail.get_node("TrainEngine") as PathFollow3D
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var closest_offset = find_closest_point_on_path(new_rail, global_position)
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current_follower.progress = closest_offset
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func find_closest_point_on_path(path: Path3D, point: Vector3) -> float:
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var curve = path.curve
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var closest_offset = 0.0
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var min_distance = INF
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var length = curve.get_baked_length()
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var steps = 100 # Più alto = più preciso ma più lento
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for i in range(steps + 1):
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var offset = (float(i) / steps) * length
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# Trasforma il punto locale della curva in coordinate globali
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var path_point = path.global_transform * curve.sample_baked(offset)
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var dist = point.distance_to(path_point)
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if dist < min_distance:
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min_distance = dist
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closest_offset = offset
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return closest_offset
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