Part 3 - Enemy tank: pathfollowing and aiming

maps/Map01.tscn

@@ -1,8 +1,16 @@
-[gd_scene load_steps=4 format=2]
+[gd_scene load_steps=6 format=2]
 
 [ext_resource path="res://maps/Map.gd" type="Script" id=1]
 [ext_resource path="res://terrain/terrain_tiles.tres" type="TileSet" id=2]
 [ext_resource path="res://tanks/Player.tscn" type="PackedScene" id=3]
+[ext_resource path="res://tanks/EnemyTank.tscn" type="PackedScene" id=4]
+
+[sub_resource type="Curve2D" id=1]
+
+bake_interval = 5.0
+_data = {
+"points": PoolVector2Array( 0, 0, 0, 0, 1601.45, 1012.35, -3.51986, -22.0791, 2.87988, 64.9573, 1600.03, 1781.92, -60.7975, -3.19987, 110.075, 0.639975, 1661.2, 1860.16, -83.5872, 4.75823, 69.7571, 0, 2658.03, 1860.19, -3.12715, 57.6289, -4.72708, -63.6338, 2755.59, 1786.34, 0, 0, 49.0723, -1.42539, 2823.39, 1727.87, -66.871, 0.905931, 84.0485, 6.07352, 2935.77, 1727.87, 0, 0, -9.59961, -79.6767, 3011.16, 1662.43, 0, 0, 0.959961, -61.4375, 3009.74, 1025.15, 0, 0, -53.1178, -5.43978, 2941.54, 958.792, 0, 0, -64.3174, -3.51986, 1664.04, 961.137, 0, 0, 0, 0, 1601.45, 1012.35 )
+}
 
 [node name="Map01" type="Node2D" index="0"]
 
@@ -27,8 +35,32 @@ collision_mask = 1
 occluder_light_mask = 1
 format = 1
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-_sections_unfolded = [ "Cell" ]
+_sections_unfolded = [ "Cell", "Visibility" ]
 
 [node name="Player" parent="." index="1" instance=ExtResource( 3 )]
 
+position = Vector2( 1941.57, 1312.05 )
+
+[node name="Paths" type="Node2D" parent="." index="2"]
+
+[node name="Path2D" type="Path2D" parent="Paths" index="0"]
+
+curve = SubResource( 1 )
+
+[node name="PathFollow2D" type="PathFollow2D" parent="Paths/Path2D" index="0"]
+
+position = Vector2( 1601.45, 1012.35 )
+rotation = 1.57734
+offset = 0.0
+h_offset = 0.0
+v_offset = 0.0
+rotate = true
+cubic_interp = true
+loop = true
+lookahead = 4.0
+
+[node name="EnemyTank" parent="Paths/Path2D/PathFollow2D" index="0" instance=ExtResource( 4 )]
+
+detect_radius = 400
+
 

tanks/EnemyTank.gd

@@ -0,0 +1,33 @@
+extends "res://tanks/Tank.gd"
+
+onready var parent = get_parent()
+
+export (float) var turret_speed
+export (int) var detect_radius
+
+var target = null
+
+func _ready():
+	$DetectRadius/CollisionShape2D.shape.radius = detect_radius
+
+func control(delta):
+	if parent is PathFollow2D:
+		parent.set_offset(parent.get_offset() + speed * delta)
+		position = Vector2()
+	else:
+		# other movement code
+		pass
+
+func _process(delta):
+	if target:
+		var target_dir = (target.global_position - global_position).normalized()
+		var current_dir = Vector2(1, 0).rotated($Turret.global_rotation)
+		$Turret.global_rotation = current_dir.linear_interpolate(target_dir, turret_speed * delta).angle()
+
+func _on_DetectRadius_body_entered(body):
+	if body.name == "Player":
+		target = body
+
+func _on_DetectRadius_body_exited(body):
+	if body == target:
+		target = null

tanks/EnemyTank.tscn

@@ -0,0 +1,66 @@
+[gd_scene load_steps=6 format=2]
+
+[ext_resource path="res://tanks/Tank.tscn" type="PackedScene" id=1]
+[ext_resource path="res://tanks/EnemyTank.gd" type="Script" id=2]
+[ext_resource path="res://assets/onlyObjects_retina_rotated.png" type="Texture" id=3]
+
+[sub_resource type="RectangleShape2D" id=1]
+
+custom_solver_bias = 0.0
+extents = Vector2( 39.7858, 35.5505 )
+
+[sub_resource type="CircleShape2D" id=2]
+
+custom_solver_bias = 0.0
+radius = 350.571
+
+[node name="EnemyTank" instance=ExtResource( 1 )]
+
+script = ExtResource( 2 )
+Bullet = null
+speed = 150
+rotation_speed = null
+gun_cooldown = 0.5
+health = 100
+turret_speed = 1.0
+detect_radius = 200
+
+[node name="Body" parent="." index="0"]
+
+texture = ExtResource( 3 )
+region_enabled = true
+region_rect = Rect2( 268, 186, 80, 76 )
+_sections_unfolded = [ "Region" ]
+
+[node name="CollisionShape2D" parent="." index="1"]
+
+visible = false
+shape = SubResource( 1 )
+
+[node name="Turret" parent="." index="2"]
+
+texture = ExtResource( 3 )
+offset = Vector2( 20, 0 )
+region_enabled = true
+region_rect = Rect2( 371, 14, 60, 24 )
+_sections_unfolded = [ "Offset", "Region", "Transform" ]
+
+[node name="DetectRadius" type="Area2D" parent="." index="4"]
+
+input_pickable = true
+gravity_vec = Vector2( 0, 1 )
+gravity = 98.0
+linear_damp = 0.1
+angular_damp = 1.0
+audio_bus_override = false
+audio_bus_name = "Master"
+
+[node name="CollisionShape2D" type="CollisionShape2D" parent="DetectRadius" index="0"]
+
+shape = SubResource( 2 )
+
+[connection signal="body_entered" from="DetectRadius" to="." method="_on_DetectRadius_body_entered"]
+
+[connection signal="body_exited" from="DetectRadius" to="." method="_on_DetectRadius_body_exited"]
+
+

terrain/TileSetMaker.tscn

@@ -3,7 +3,7 @@
 [ext_resource path="res://terrain/TileSetMaker.gd" type="Script" id=1]
 [ext_resource path="res://assets/terrainTiles_retina.png" type="Texture" id=2]
 
-[node name="TileSetMaker" type="Node" index="0"]
+[node name="TileSetMaker" type="Node"]
 
 script = ExtResource( 1 )