Improve fleets

scenes/ships_fleet/ship/ship.gd

@@ -1,10 +1,39 @@
 class_name Ship
 extends Node2D
 
+const ACCELERATION = 100.
+const ROTATION_SPEED = 3.
+const MAX_SPEED = 100.
+
 @export var color: Color :
 	set(value):
 		color = value
 		_update_color(color)
 
+@export var target_position: Vector2
+
+var velocity: Vector2
+
+func _process(delta: float) -> void:
+	var target_velocity := (target_position - global_position).normalized() * MAX_SPEED
+	var adjusted_target_velocity := target_velocity - velocity
+	var acceleration := Vector2.ZERO if adjusted_target_velocity == Vector2.ZERO else adjusted_target_velocity.normalized() * ACCELERATION
+
+	var decelerate_at_distance := velocity.length_squared() / (2. * ACCELERATION)
+	var distance_squared := global_position.distance_squared_to(target_position)
+	var slow_down := distance_squared < decelerate_at_distance*decelerate_at_distance
+	if slow_down:
+		acceleration = velocity.normalized() * -ACCELERATION
+
+	velocity += acceleration * delta
+
+	var speed_squared := velocity.length_squared()
+	if speed_squared > MAX_SPEED*MAX_SPEED:
+		velocity = velocity / sqrt(speed_squared) * MAX_SPEED
+
+	global_position += velocity * delta
+
+	rotation = rotate_toward(rotation, global_position.angle_to_point(target_position), min(1., delta) * ROTATION_SPEED)
+
 func _update_color(ship_color: Color) -> void:
 	%LineTrail.material.set_shader_parameter('color', ship_color)

scenes/ships_fleet/ships_fleet.gd

@@ -1,6 +1,11 @@
 extends Node2D
 class_name ShipsFleet
 
+const RANK_SIZE = 7
+const RANKS_DISTANCE = 12.
+const SHOULDER_DISTANCE = 8.
+const DISPERSE_AT_DISTANCE = 100.
+
 @export var departed_at: int # Time.get_ticks_msec()
 
 @export var arrives_at: int # Time.get_ticks_msec()
@@ -14,7 +19,7 @@ class_name ShipsFleet
 @export var count: int :
 	set(value):
 		count = value
-		_update_instances_count()
+		_update_ships_count()
 
 @export var trail: Trail
 
@@ -32,24 +37,24 @@ func _exit_tree() -> void:
 
 #region Graphics
 
-var _instances: Array[Node2D] = []
+var _ships: Array[Ship] = []
 
 @export var ship_template: PackedScene
 
-func _update_instances_count() -> void:
-	var diff = count - _instances.size()
+func _update_ships_count() -> void:
+	var diff = count - _ships.size()
 
 	for i in range(diff):
-		var j = float(1 + _instances.size())
 		var ship: Ship = ship_template.instantiate()
 		ship.color = player.color
 		add_child(ship)
-		ship.position = Vector2.from_angle(j) * j * 2.
-		ship.look_at(to - from)
-		_instances.push_back(ship)
+		ship.position = from
+		ship.rotation = randf_range(0, 2 * PI)
+		ship.velocity = randf_range(60., 120.) * Vector2.from_angle(ship.rotation)
+		_ships.push_back(ship)
 
 	for i in range(-diff):
-		var ship: Node2D = _instances.pop_back()
+		var ship: Ship = _ships.pop_back()
 		remove_child(ship)
 
 var _arrived := false
@@ -58,7 +63,18 @@ func _update_position(tick: int) -> void:
 	if not _arrived:
 		var clamped_tick := clampi(tick, departed_at, arrives_at)
 		var progress := float(clamped_tick - departed_at) / float(arrives_at - departed_at)
-		position = lerp(from, to, smoothstep(0., 1., progress))
+		var fleet_position: Vector2 = lerp(from, to, clampf(progress, 0., 1.))
+		var dispersiveness := clampf(sqrt(minf(fleet_position.distance_squared_to(from), fleet_position.distance_squared_to(to))) / DISPERSE_AT_DISTANCE, 0., 1.)
+
+		var angle = from.angle_to_point(to)
+		var ranks_count := ceili(float(_ships.size()) / RANK_SIZE)
+		for i in range(_ships.size()):
+			var rank := floori(float(i) / RANK_SIZE)
+			var position_in_rank := i % RANK_SIZE
+			var ships_in_rank := RANK_SIZE if rank != ranks_count - 1 else (_ships.size() - (ranks_count - 1) * RANK_SIZE)
+			var assigned_position := Vector2(rank * -RANKS_DISTANCE - abs(position_in_rank - ships_in_rank / 2.) * 5., float(position_in_rank - (ships_in_rank - 1) * .5) * SHOULDER_DISTANCE)
+			_ships[i].target_position = fleet_position + lerp(Vector2.ZERO, assigned_position.rotated(angle) + Vector2.from_angle(sin(i + tick / 10.)) * 2., dispersiveness)
+
 		if tick >= arrives_at:
 			_arrived = true
 			trail.show_trail = false

scenes/templates/scene_templates.tres

@@ -1,4 +1,4 @@
-[gd_resource type="Resource" script_class="TemplateScenes" load_steps=5 format=3 uid="uid://cp0dudi0f5r62"]
+[gd_resource type="Resource" script_class="SceneTemplates" load_steps=5 format=3 uid="uid://cp0dudi0f5r62"]
 
 [ext_resource type="PackedScene" uid="uid://dq00mi6jwsa1f" path="res://scenes/control_planet/control_planet.tscn" id="1_3rbtf"]
 [ext_resource type="Script" path="res://scenes/templates/scene_templates.gd" id="1_yvn3m"]