godot-steering-ai-framework/project/demos/FollowPath/PathFollower.gd
Francois Belair 6e6f27505c Fix init time setters and export Follow variables
The use of `not is_inside_tree()` before setting the setting class' value
meant that the starting values would always be the default. Moving the
value setting before checking for tree readiness fixes the issue.
2020-01-16 12:31:02 -05:00

57 lines
1.5 KiB
GDScript

extends KinematicBody2D
onready var agent := GSTSteeringAgent.new()
onready var path := GSTPath.new([
Vector3(global_position.x, global_position.y, 0),
Vector3(global_position.x, global_position.y, 0)
], true)
onready var follow := GSTFollowPath.new(agent, path, 0, 0)
var _velocity := Vector2.ZERO
var _accel := GSTTargetAcceleration.new()
var _valid := false
var _drag := 0.1
func setup(
path_offset: float,
predict_time: float,
max_accel: float,
max_speed: float,
decel_radius: float,
arrival_tolerance: float
) -> void:
owner.drawer.connect("path_established", self, "_on_Drawer_path_established")
follow.path_offset = path_offset
follow.prediction_time = predict_time
agent.max_linear_acceleration = max_accel
agent.max_linear_speed = max_speed
follow.deceleration_radius = decel_radius
follow.arrival_tolerance = arrival_tolerance
func _physics_process(delta: float) -> void:
if _valid:
_update_agent()
_accel = follow.calculate_steering(_accel)
_velocity += Vector2(_accel.linear.x, _accel.linear.y)
_velocity = _velocity.linear_interpolate(Vector2.ZERO, _drag)
_velocity = _velocity.clamped(agent.max_linear_speed)
_velocity = move_and_slide(_velocity)
func _update_agent() -> void:
agent.position.x = global_position.x
agent.position.y = global_position.y
agent.linear_velocity.x = _velocity.x
agent.linear_velocity.y = _velocity.y
func _on_Drawer_path_established(points: Array) -> void:
var points3 := []
for p in points:
points3.append(Vector3(p.x, p.y, 0))
path.create_path(points3)
_valid = true