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62 lines
1.5 KiB
GDScript
62 lines
1.5 KiB
GDScript
extends Node2D
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enum States { IDLE, FOLLOW }
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const MASS = 10.0
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const ARRIVE_DISTANCE = 10.0
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export(float) var speed = 200.0
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var _state = States.IDLE
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var _path = []
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var _target_point_world = Vector2()
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var _target_position = Vector2()
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var _velocity = Vector2()
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func _ready():
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_change_state(States.IDLE)
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func _process(_delta):
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if _state != States.FOLLOW:
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return
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var _arrived_to_next_point = _move_to(_target_point_world)
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if _arrived_to_next_point:
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_path.remove(0)
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if len(_path) == 0:
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_change_state(States.IDLE)
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return
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_target_point_world = _path[0]
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func _unhandled_input(event):
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if event.is_action_pressed("click"):
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var global_mouse_pos = get_global_mouse_position()
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if Input.is_key_pressed(KEY_SHIFT):
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global_position = global_mouse_pos
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else:
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_target_position = global_mouse_pos
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_change_state(States.FOLLOW)
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func _move_to(world_position):
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var desired_velocity = (world_position - position).normalized() * speed
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var steering = desired_velocity - _velocity
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_velocity += steering / MASS
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position += _velocity * get_process_delta_time()
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rotation = _velocity.angle()
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return position.distance_to(world_position) < ARRIVE_DISTANCE
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func _change_state(new_state):
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if new_state == States.FOLLOW:
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_path = get_parent().get_node("TileMap").get_astar_path(position, _target_position)
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if not _path or len(_path) == 1:
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_change_state(States.IDLE)
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return
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# The index 0 is the starting cell.
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# We don't want the character to move back to it in this example.
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_target_point_world = _path[1]
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_state = new_state
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