create goomba behavior

scenes/enemies/Enemy.cs

@@ -0,0 +1,19 @@
+using Godot;
+using System;
+
+public class Enemy : KinematicBody2D
+{
+    [Export]
+    private Vector2 _startPosition;
+    public Vector2 StartPosition { get { return _startPosition; } }
+
+    public override void _Ready()
+    {
+        _startPosition = Position;
+    }
+
+    public virtual void Reset()
+    {
+        Position = _startPosition;
+    }
+}

scenes/enemies/EnemyWalking.cs

@@ -0,0 +1,31 @@
+using Godot;
+using System;
+
+public class EnemyWalking : Enemy
+{
+    [Export]
+    private int _gravity = (int) ProjectSettings.GetSetting("physics/2d/default_gravity");
+    private Vector2 _velocity;
+
+    public override void _Ready()
+    {
+        base._Ready();
+        _velocity = new Vector2();
+    }
+
+    public override void _PhysicsProcess(float delta)
+    {
+        _velocity.y += (int) _gravity * delta * 5;
+        _velocity.x = 25 * -1;
+        _velocity = MoveAndSlide(_velocity, Vector2.Up);
+
+        Mathf.Round(Position.x);
+        Mathf.Round(Position.y);
+    }
+
+    public override void Reset()
+    {
+        base.Reset();
+        _velocity = new Vector2();
+    }
+}

scenes/enemies/goomba/Goomba.cs

@@ -0,0 +1,19 @@
+using Godot;
+using System;
+
+public class Goomba : EnemyWalking
+{
+    private AnimatedSprite _sprite;
+
+    public override void _Ready()
+    {
+        base._Ready();
+        _sprite = GetNode<AnimatedSprite>("AnimatedSprite");
+        _sprite.Play("walk");
+    }
+
+    public void OnVisibilityNotifier2DScreenExited()
+    {
+        Reset();
+    }
+}

scenes/enemies/goomba/Goomba.tscn

@@ -1,6 +1,7 @@
-[gd_scene load_steps=7 format=2]
+[gd_scene load_steps=8 format=2]
 
 [ext_resource path="res://assets/goomba/walking.png" type="Texture" id=1]
+[ext_resource path="res://scenes/enemies/goomba/Goomba.cs" type="Script" id=2]
 
 [sub_resource type="AtlasTexture" id=1]
 atlas = ExtResource( 1 )
@@ -23,10 +24,11 @@ animations = [ {
 } ]
 
 [sub_resource type="RectangleShape2D" id=5]
-extents = Vector2( 6.5, 7 )
+extents = Vector2( 6.67969, 7 )
 
 [node name="Goomba" type="KinematicBody2D" groups=["Enemy", "Stompable"]]
 collision_layer = 4
+script = ExtResource( 2 )
 
 [node name="AnimatedSprite" type="AnimatedSprite" parent="."]
 frames = SubResource( 4 )
@@ -34,5 +36,14 @@ animation = "walk"
 
 [node name="CollisionShape2D" type="CollisionShape2D" parent="."]
 visible = false
-position = Vector2( 0.5, 2 )
+position = Vector2( 0.320312, 2 )
 shape = SubResource( 5 )
+
+[node name="VisibilityEnabler2D" type="VisibilityEnabler2D" parent="."]
+visible = false
+position = Vector2( 1, 0 )
+rect = Rect2( -9, -9, 18, 18 )
+process_parent = true
+physics_process_parent = true
+
+[connection signal="screen_exited" from="VisibilityEnabler2D" to="." method="OnVisibilityNotifier2DScreenExited"]