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.

project/demos/Arrive/ArriveDemo.gd

@@ -2,7 +2,7 @@ extends Node2D
 
 
 export(float, 0, 2000, 40) var max_linear_speed := 800.0 setget set_max_linear_speed
-export(float, 0, 200, 1) var max_linear_acceleration := 80.0 setget set_max_linear_acceleration
+export(float, 0, 200, 2.0) var max_linear_acceleration := 80.0 setget set_max_linear_acceleration
 export(float, 0, 100, 0.1) var arrival_tolerance := 25.0 setget set_arrival_tolerance
 export(float, 0, 500, 10) var deceleration_radius := 125.0 setget set_deceleration_radius
 
@@ -36,34 +36,32 @@ func _draw():
 
 
 func set_arrival_tolerance(value: float) -> void:
+	arrival_tolerance = value
 	if not is_inside_tree():
 		return
 	
-	arrival_tolerance = value
 	arriver.arrive.arrival_tolerance = value
-	update()
 
 
 func set_deceleration_radius(value: float) -> void:
+	deceleration_radius = value
 	if not is_inside_tree():
 		return
 	
-	deceleration_radius = value
 	arriver.arrive.deceleration_radius = value
-	update()
 
 
 func set_max_linear_speed(value: float) -> void:
+	max_linear_speed = value
 	if not is_inside_tree():
 		return
 	
-	max_linear_speed = value
 	arriver.agent.max_linear_speed = value
 
 
 func set_max_linear_acceleration(value: float) -> void:
+	max_linear_acceleration = value
 	if not is_inside_tree():
 		return
 	
-	max_linear_acceleration = value
 	arriver.agent.max_linear_acceleration = value

project/demos/Face/FaceDemo.gd

@@ -5,11 +5,11 @@ onready var player := $Player
 onready var gui := $GUI
 onready var turret := $Turret
 
-export(int, 0, 359) var max_angular_speed := 90 setget set_max_angular_speed
-export(int, 0, 359) var max_angular_accel := 5 setget set_max_angular_accel
-export(int, 0, 180) var align_tolerance := 5 setget set_align_tolerance
-export(int, 0, 359) var deceleration_radius := 45 setget set_deceleration_radius
-export(float, 0, 1000) var player_speed := 600.0 setget set_player_speed
+export(int, 0, 359, 2) var max_angular_speed := 120 setget set_max_angular_speed
+export(int, 0, 359, 2) var max_angular_accel := 10 setget set_max_angular_accel
+export(int, 0, 180, 2) var align_tolerance := 5 setget set_align_tolerance
+export(int, 0, 359, 2) var deceleration_radius := 45 setget set_deceleration_radius
+export(float, 0, 1000, 40) var player_speed := 600.0 setget set_player_speed
 
 
 func _ready() -> void:
@@ -24,40 +24,40 @@ func _ready() -> void:
 
 
 func set_align_tolerance(value: int) -> void:
+	align_tolerance = value
 	if not is_inside_tree():
 		return
 	
-	align_tolerance = value
 	turret.face.alignment_tolerance = deg2rad(value)
 
 
 func set_deceleration_radius(value: int) -> void:
+	deceleration_radius = value
 	if not is_inside_tree():
 		return
 	
-	deceleration_radius = value
 	turret.face.deceleration_radius = deg2rad(value)
 
 
 func set_max_angular_accel(value: int) -> void:
+	max_angular_accel = value
 	if not is_inside_tree():
 		return
 	
-	max_angular_accel = value
 	turret.agent.max_angular_acceleration = deg2rad(value)
 
 
 func set_max_angular_speed(value: int) -> void:
+	max_angular_speed = value
 	if not is_inside_tree():
 		return
 	
-	max_angular_speed = value
 	turret.agent.max_angular_speed = deg2rad(value)
 
 
 func set_player_speed(value: float) -> void:
+	player_speed = value
 	if not is_inside_tree():
 		return
 	
-	player_speed = value
 	player.speed = player_speed

project/demos/Face/Turret.gd

@@ -5,7 +5,7 @@ var face: GSTFace
 var agent := GSTSteeringAgent.new()
 
 var _accel := GSTTargetAcceleration.new()
-var _angular_drag := 0.01
+var _angular_drag := 0.1
 var _cannon: Rect2
 
 onready var collision_shape := $CollisionShape2D

project/demos/FollowPath/FollowPathDemo.gd

@@ -1,8 +1,71 @@
 extends Node2D
 
 
-onready var drawer := $Drawer 
+export(float, 0, 2000, 40) var max_linear_speed := 600.0 setget set_max_linear_speed
+export(float, 0, 200, 10.0) var max_linear_acceleration := 40.0 setget set_max_linear_acceleration
+export(float, 0, 100, 0.1) var arrival_tolerance := 10.0 setget set_arrival_tolerance
+export(float, 0, 500, 10) var deceleration_radius := 100.0 setget set_deceleration_radius
+export(float, 0, 5, 0.1) var predict_time := 0.3 setget set_predict_time
+export(float, 0, 200, 10.0) var path_offset := 20.0 setget set_path_offset
+
+onready var drawer := $Drawer
+onready var follower := $PathFollower
 
 
 func _ready() -> void:
-	$PathFollower.setup()
+	follower.setup(
+			path_offset,
+			predict_time,
+			max_linear_acceleration,
+			max_linear_speed,
+			deceleration_radius,
+			arrival_tolerance
+	)
+
+
+func set_max_linear_speed(value: float) -> void:
+	max_linear_speed = value
+	if not is_inside_tree():
+		return
+	
+	follower.agent.max_linear_speed = value
+
+
+func set_max_linear_acceleration(value: float) -> void:
+	max_linear_acceleration = value
+	if not is_inside_tree():
+		return
+	
+	follower.agent.max_linear_acceleration = value
+
+
+func set_arrival_tolerance(value: float) -> void:
+	arrival_tolerance = value
+	if not is_inside_tree():
+		return
+	
+	follower.follow.arrival_tolerance = value
+
+
+func set_deceleration_radius(value: float) -> void:
+	deceleration_radius = value
+	if not is_inside_tree():
+		return
+	
+	follower.follow.deceleration_radius = value
+
+
+func set_predict_time(value: float) -> void:
+	predict_time = value
+	if not is_inside_tree():
+		return
+	
+	follower.follow.prediction_time = value
+
+
+func set_path_offset(value: float) -> void:
+	path_offset = value
+	if not is_inside_tree():
+		return
+	
+	follower.follow.path_offset = value

project/demos/FollowPath/FollowPathDemo.tscn

@@ -1,9 +1,10 @@
-[gd_scene load_steps=6 format=2]
+[gd_scene load_steps=7 format=2]
 
 [ext_resource path="res://demos/FollowPath/Drawer.gd" type="Script" id=1]
 [ext_resource path="res://assets/sprites/small_circle.png" type="Texture" id=2]
 [ext_resource path="res://demos/FollowPath/PathFollower.gd" type="Script" id=3]
 [ext_resource path="res://demos/FollowPath/FollowPathDemo.gd" type="Script" id=4]
+[ext_resource path="res://assets/theme/gdquest.theme" type="Theme" id=5]
 
 [sub_resource type="CircleShape2D" id=1]
 radius = 16.0
@@ -24,3 +25,28 @@ shape = SubResource( 1 )
 [node name="Sprite" type="Sprite" parent="PathFollower"]
 modulate = Color( 0.960784, 0.231373, 0.0392157, 1 )
 texture = ExtResource( 2 )
+
+[node name="GUI" type="PanelContainer" parent="."]
+margin_right = 1024.0
+margin_bottom = 14.0
+theme = ExtResource( 5 )
+__meta__ = {
+"_edit_use_anchors_": false
+}
+
+[node name="MarginContainer" type="MarginContainer" parent="GUI"]
+margin_right = 1024.0
+margin_bottom = 116.0
+
+[node name="RichTextLabel" type="RichTextLabel" parent="GUI/MarginContainer"]
+margin_left = 16.0
+margin_top = 16.0
+margin_right = 1008.0
+margin_bottom = 100.0
+rect_min_size = Vector2( 0, 84 )
+bbcode_enabled = true
+bbcode_text = "Follow Path Demo
+Use the mouse to draw a path on screen and watch the [color=red]red \"Agent\"[/color] follow it to the end."
+text = "Follow Path Demo
+Use the mouse to draw a path on screen and watch the red \"Agent\" follow it to the end."
+scroll_active = false

project/demos/FollowPath/PathFollower.gd

@@ -6,17 +6,29 @@ 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, 20, 0)
+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() -> void:
+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")
-	agent.max_linear_acceleration = 20
-	agent.max_linear_speed = 200
+	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:
@@ -24,6 +36,7 @@ func _physics_process(delta: float) -> void:
 		_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)
 

project/demos/GroupBehaviors/GroupBehaviorsDemo.gd

@@ -3,12 +3,12 @@ extends Node2D
 
 onready var spawner := $Spawner
 
-export var max_linear_speed := 100.0 setget set_max_linear_speed
-export var max_linear_accel := 25.0 setget set_max_linear_accel
-export var proximity_radius := 140.0 setget set_proximity_radius
-export var separation_decay_coefficient := 2000.0 setget set_separation_decay_coef
-export var cohesion_strength := 0.3 setget set_cohesion_strength
-export var separation_strength := 1.5 setget set_separation_strength
+export(float, 0, 2000, 40.0) var max_linear_speed := 600.0 setget set_max_linear_speed
+export(float, 0, 200, 2.0) var max_linear_accel := 40.0 setget set_max_linear_accel
+export(float, 0, 300, 2.0) var proximity_radius := 140.0 setget set_proximity_radius
+export(float, 0, 10000, 100) var separation_decay_coefficient := 2000.0 setget set_separation_decay_coef
+export(float, 0, 2, 0.1) var cohesion_strength := 0.1 setget set_cohesion_strength
+export(float, 0, 6, 0.1) var separation_strength := 1.5 setget set_separation_strength
 export var show_proximity_radius := true setget set_show_proximity_radius
 
 
@@ -25,56 +25,56 @@ func _ready() -> void:
 
 
 func set_max_linear_speed(value: float) -> void:
+	max_linear_speed = value
 	if not is_inside_tree():
 		return
 	
-	max_linear_speed = value
 	spawner.set_max_linear_speed(value)
 
 
 func set_max_linear_accel(value: float) -> void:
+	max_linear_accel = value
 	if not is_inside_tree():
 		return
 	
-	max_linear_accel = value
 	spawner.set_max_linear_accel(value)
 
 
 func set_proximity_radius(value: float) -> void:
+	proximity_radius = value
 	if not is_inside_tree():
 		return
 	
-	proximity_radius = value
 	spawner.set_proximity_radius(value)
 
 
 func set_show_proximity_radius(value: bool) -> void:
+	show_proximity_radius = value
 	if not is_inside_tree():
 		return
 	
-	show_proximity_radius = value
 	spawner.set_show_proximity_radius(value)
 
 
 func set_separation_decay_coef(value: float) -> void:
+	separation_decay_coefficient = value
 	if not is_inside_tree():
 		return
 	
-	separation_decay_coefficient = value
 	spawner.set_separation_decay_coef(value)
 
 
 func set_cohesion_strength(value: float) -> void:
+	cohesion_strength = value
 	if not is_inside_tree():
 		return
 	
-	cohesion_strength = value
 	spawner.set_cohesion_strength(value)
 
 
 func set_separation_strength(value: float) -> void:
+	separation_strength = value
 	if not is_inside_tree():
 		return
 	
-	separation_strength = value
 	spawner.set_separation_strength(value)

project/demos/GroupBehaviors/GroupBehaviorsDemo.tscn

@@ -1,13 +1,41 @@
-[gd_scene load_steps=4 format=2]
+[gd_scene load_steps=5 format=2]
 
 [ext_resource path="res://demos/GroupBehaviors/Member.tscn" type="PackedScene" id=1]
 [ext_resource path="res://demos/GroupBehaviors/Spawner.gd" type="Script" id=2]
 [ext_resource path="res://demos/GroupBehaviors/GroupBehaviorsDemo.gd" type="Script" id=3]
+[ext_resource path="res://assets/theme/gdquest.theme" type="Theme" id=4]
 
 [node name="GroupBehaviorsDemo" type="Node2D"]
 script = ExtResource( 3 )
+cohesion_strength = 0.2
+separation_strength = 4.5
 
 [node name="Spawner" type="Node2D" parent="."]
 position = Vector2( 512, 300 )
 script = ExtResource( 2 )
 member = ExtResource( 1 )
+
+[node name="GUI" type="PanelContainer" parent="."]
+margin_right = 1024.0
+margin_bottom = 14.0
+theme = ExtResource( 4 )
+__meta__ = {
+"_edit_use_anchors_": false
+}
+
+[node name="MarginContainer" type="MarginContainer" parent="GUI"]
+margin_right = 1024.0
+margin_bottom = 116.0
+
+[node name="RichTextLabel" type="RichTextLabel" parent="GUI/MarginContainer"]
+margin_left = 16.0
+margin_top = 16.0
+margin_right = 1008.0
+margin_bottom = 100.0
+rect_min_size = Vector2( 0, 84 )
+bbcode_enabled = true
+bbcode_text = "Group Behavior Demo
+Each of the \"Agents\" are both attempting to stay separated and within reach of their nearest group's center of mass."
+text = "Group Behavior Demo
+Each of the \"Agents\" are both attempting to stay separated and within reach of their nearest group's center of mass."
+scroll_active = false

project/demos/GroupBehaviors/Member.gd

@@ -40,12 +40,13 @@ func _draw() -> void:
 		draw_circle(Vector2.ZERO, proximity.radius, Color(0, 1, 0, 0.1))
 
 
-func _process(delta: float) -> void:
+func _physics_process(delta: float) -> void:
 	agent.position.x = global_position.x
 	agent.position.y = global_position.y
 	if blend:
 		acceleration = blend.calculate_steering(acceleration)
 		_velocity += Vector2(acceleration.linear.x, acceleration.linear.y)
+		_velocity = _velocity.linear_interpolate(Vector2.ZERO, 0.1)
 		_velocity = _velocity.clamped(agent.max_linear_speed)
 		move_and_slide(_velocity)
 

project/demos/PursueSeek/BoundaryManager.gd

@@ -1,5 +1,5 @@
 extends Node2D
-# Wraps the ships' positions around the world border, and controls their rendering clones.
+# Wraps the ships' positions around the world border.
 
 
 var _world_bounds: Vector2

project/demos/PursueSeek/Player.gd

@@ -4,7 +4,7 @@ extends KinematicBody2D
 
 onready var agent := GSTSteeringAgent.new()
 
-export var thruster_strength := 250.0
+export var thruster_strength := 175.0
 export var side_thruster_strength := 10.0
 export var max_velocity := 300.0
 export var max_angular_velocity := 2.0

project/demos/PursueSeek/PursueVSSeekDemo.gd

@@ -1,9 +1,9 @@
 extends Node2D
 
 
-export(float, 0, 2000, 40) var max_linear_speed := 200.0 setget set_max_linear_speed
-export(float, 0, 200, 1) var max_linear_accel := 10.0 setget set_max_linear_accel
-export(float, 0, 5, 0.1) var predict_time := 2.0 setget set_predict_time
+export(float, 0, 2000, 40) var max_linear_speed := 120.0 setget set_max_linear_speed
+export(float, 0, 200, 2) var max_linear_accel := 10.0 setget set_max_linear_accel
+export(float, 0, 5, 0.1) var predict_time := 1.0 setget set_predict_time
 
 onready var pursuer := $BoundaryManager/Pursuer
 onready var seeker := $BoundaryManager/Seeker
@@ -15,26 +15,26 @@ func _ready() -> void:
 
 
 func set_max_linear_speed(value: float) -> void:
+	max_linear_speed = value
 	if not is_inside_tree():
 		return
 	
-	max_linear_speed = value
 	pursuer.agent.max_linear_speed = value
 	seeker.agent.max_linear_speed = value
 
 
 func set_max_linear_accel(value: float) -> void:
+	max_linear_accel = value
 	if not is_inside_tree():
 		return
 	
-	max_linear_accel = value
 	pursuer.agent.max_linear_acceleration = value
 	seeker.agent.max_linear_acceleration = value
 
 
 func set_predict_time(value: float) -> void:
+	predict_time = value
 	if not is_inside_tree():
 		return
 	
-	predict_time = value
 	pursuer._behavior.max_predict_time = value

project/demos/PursueSeek/PursueVSSeekDemo.tscn

@@ -12,8 +12,7 @@ script = ExtResource( 4 )
 __meta__ = {
 "_editor_description_": "Toy demo to demonstrate the use of the Pursue contrasted to the more naive Seek steering behavior."
 }
-max_linear_speed = 120.0
-predict_time = 1.0
+max_linear_speed = 200.0
 
 [node name="BoundaryManager" type="Node2D" parent="."]
 script = ExtResource( 3 )

project/demos/PursueSeek/Pursuer.gd

@@ -14,7 +14,7 @@ var _behavior: GSTSteeringBehavior
 var _linear_velocity := Vector2()
 var _linear_drag_coefficient := 0.025
 var _angular_velocity := 0.0
-var _angular_drag := 1.0
+var _angular_drag := 0.1
 
 
 func _ready() -> void:
@@ -22,13 +22,16 @@ func _ready() -> void:
 
 
 func _physics_process(delta: float) -> void:
+	_update_agent()
+	
 	accel = _orient_behavior.calculate_steering(accel)
 	_angular_velocity += accel.angular
 	
-	if _angular_velocity < 0:
-		_angular_velocity += _angular_drag * delta
-	elif _angular_velocity > 0:
-		_angular_velocity -= _angular_drag * delta
+	_angular_velocity = clamp(
+			lerp(_angular_velocity, 0, _angular_drag),
+			-agent.max_angular_speed,
+			agent.max_angular_speed
+	)
 	
 	rotation += _angular_velocity * delta
 	
@@ -37,8 +40,6 @@ func _physics_process(delta: float) -> void:
 	_linear_velocity = _linear_velocity.linear_interpolate(Vector2.ZERO, _linear_drag_coefficient)
 	_linear_velocity = _linear_velocity.clamped(agent.max_linear_speed)
 	_linear_velocity = move_and_slide(_linear_velocity)
-	
-	_update_agent()
 
 
 func setup(predict_time: float, max_linear_speed: float, max_linear_accel: float) -> void:

project/demos/SeekFlee/SeekFleeDemo.gd

@@ -43,10 +43,10 @@ func _ready() -> void:
 
 
 func set_behavior_mode(mode: int) -> void:
+	behavior_mode = mode
 	if not is_inside_tree():
 		return
 	
-	behavior_mode = mode
 	match mode:
 		Mode.SEEK:
 			for child in spawner.get_children():
@@ -57,26 +57,26 @@ func set_behavior_mode(mode: int) -> void:
 
 
 func set_max_linear_speed(value: float) -> void:
+	max_linear_speed = value
 	if not is_inside_tree():
 		return
 	
-	max_linear_speed = value
 	for child in spawner.get_children():
 		child.agent.max_linear_speed = value
 
 
 func set_max_linear_accel(value: float) -> void:
+	max_linear_accel = value
 	if not is_inside_tree():
 		return
 	
-	max_linear_accel = value
 	for child in spawner.get_children():
 		child.agent.max_linear_acceleration = value
 
 
 func set_player_speed(value: float) -> void:
+	player_speed = value
 	if not is_inside_tree():
 		return
 	
-	player_speed = value
 	player.speed = player_speed