96 lines
2.3 KiB
GDScript
96 lines
2.3 KiB
GDScript
extends KinematicBody2D
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# Controls the player ship's movements based on player input.
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export var thruster_strength := 175.0
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export var side_thruster_strength := 10.0
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export var velocity_max := 300.0
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export var angular_velocity_max := 2.0
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export var angular_drag := 0.025
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export var linear_drag := 0.025
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var _linear_velocity := Vector2()
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var _angular_velocity := 0.0
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onready var agent := GSTSteeringAgent.new()
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func _physics_process(delta: float) -> void:
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var movement := _get_movement()
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_angular_velocity = _calculate_angular_velocity(
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movement.x,
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_angular_velocity,
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side_thruster_strength,
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angular_velocity_max,
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angular_drag,
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delta
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)
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rotation += _angular_velocity * delta
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_linear_velocity = _calculate_linear_velocity(
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movement.y,
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_linear_velocity,
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Vector2.UP.rotated(rotation),
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linear_drag,
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thruster_strength,
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velocity_max,
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delta
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)
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_linear_velocity = move_and_slide(_linear_velocity)
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_update_agent()
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func _calculate_angular_velocity(
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horizontal_movement: float,
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current_velocity: float,
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thruster_strength: float,
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velocity_max: float,
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ship_drag: float,
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delta: float
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) -> float:
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var velocity := clamp(
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current_velocity + thruster_strength * horizontal_movement * delta,
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-velocity_max,
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velocity_max
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)
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velocity = lerp(velocity, 0, ship_drag)
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return velocity
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func _calculate_linear_velocity(
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vertical_movement: float,
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current_velocity: Vector2,
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facing_direction: Vector2,
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ship_drag_coefficient: float,
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strength: float,
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speed_max: float,
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delta: float
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) -> Vector2:
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var actual_strength := 0.0
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if vertical_movement > 0:
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actual_strength = strength
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elif vertical_movement < 0:
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actual_strength = -strength/1.5
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var velocity := current_velocity + facing_direction * actual_strength * delta
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velocity = velocity.linear_interpolate(Vector2.ZERO, ship_drag_coefficient)
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return velocity.clamped(speed_max)
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func _get_movement() -> Vector2:
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return Vector2( Input.get_action_strength("sf_right") - Input.get_action_strength("sf_left"),
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Input.get_action_strength("sf_up") - Input.get_action_strength("sf_down"))
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func _update_agent() -> void:
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agent.position.x = global_position.x
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agent.position.y = global_position.y
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agent.linear_velocity.x = _linear_velocity.x
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agent.linear_velocity.y = _linear_velocity.y
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agent.angular_velocity = _angular_velocity
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agent.orientation = rotation
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