feat: Added Basic Camera

Engine.Core/Abstract/ICamera.cs

@@ -0,0 +1,24 @@
+using System;
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
+
+namespace Syntriax.Engine.Core.Abstract;
+
+public interface ICamera
+{
+    Action<ICamera>? OnMatrixTransformChanged { get; set; }
+    Action<ICamera>? OnViewportChanged { get; set; }
+    Action<ICamera>? OnPositionChanged { get; set; }
+    Action<ICamera>? OnRotationChanged { get; set; }
+    Action<ICamera>? OnZoomChanged { get; set; }
+
+    Matrix MatrixTransform { get; }
+    Viewport Viewport { get; set; }
+
+    Vector2 Position { get; set; }
+
+    float Rotation { get; set; }
+    float Zoom { get; set; }
+
+    void Update();
+}

Engine.Core/CameraBehaviour.cs

@@ -0,0 +1,98 @@
+using System;
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
+using Syntriax.Engine.Core.Abstract;
+
+namespace Syntriax.Engine.Core;
+
+public class CameraBehaviour : BehaviourOverride, ICamera
+{
+    public Action<ICamera>? OnPositionChanged { get; set; } = null;
+    public Action<ICamera>? OnMatrixTransformChanged { get; set; } = null;
+    public Action<ICamera>? OnViewportChanged { get; set; } = null;
+    public Action<ICamera>? OnRotationChanged { get; set; } = null;
+    public Action<ICamera>? OnZoomChanged { get; set; } = null;
+
+    private Matrix _matrixTransform = Matrix.Identity;
+
+    private Viewport _viewport = default;
+
+    private float _zoom = 1f;
+
+    public Matrix MatrixTransform
+    {
+        get => _matrixTransform;
+        set
+        {
+            if (_matrixTransform == value)
+                return;
+
+            _matrixTransform = value;
+            OnMatrixTransformChanged?.Invoke(this);
+        }
+    }
+
+    public Vector2 Position
+    {
+        get => Transform.Position;
+        set => Transform.Position = value;
+    }
+
+    public Viewport Viewport
+    {
+        get => _viewport;
+        set
+        {
+            if (_viewport.Equals(value))
+                return;
+
+            _viewport = value;
+            OnViewportChanged?.Invoke(this);
+        }
+    }
+
+    public float Zoom
+    {
+        get => _zoom;
+        set
+        {
+            float newValue = value >= .1f ? value : .1f;
+
+            if (_zoom == newValue)
+                return;
+
+            _zoom = newValue;
+            OnZoomChanged?.Invoke(this);
+        }
+    }
+
+    public float Rotation
+    {
+        get => Transform.Rotation;
+        set => Transform.Rotation = value;
+    }
+
+    public void Update()
+    {
+        MatrixTransform =
+            Matrix.CreateTranslation(new Vector3(-Position.X, Position.Y, 0f)) *
+            Matrix.CreateRotationZ(Rotation) *
+            Matrix.CreateScale(Zoom) *
+            Matrix.CreateTranslation(new Vector3(_viewport.Width * .5f, _viewport.Height * .5f, 0f));
+    }
+
+    protected override void OnInitialize()
+    {
+        Transform.OnRotationChanged += OnTransformRotationChanged;
+        Transform.OnPositionChanged += OnTransformPositionChanged;
+    }
+
+    protected override void OnFinalize()
+    {
+        Transform.OnRotationChanged -= OnTransformRotationChanged;
+        Transform.OnPositionChanged -= OnTransformPositionChanged;
+    }
+
+    private void OnTransformRotationChanged(ITransform _) => OnRotationChanged?.Invoke(this);
+    private void OnTransformPositionChanged(ITransform _) => OnPositionChanged?.Invoke(this);
+}

Engine.Core/GameManager.cs

@@ -12,6 +12,7 @@ namespace Syntriax.Engine.Core;
 
 public class GameManager : IEntity
 {
+    public Action<GameManager>? OnCameraChanged { get; set; } = null;
     public Action<IInitialize>? OnInitialized { get; set; } = null;
     public Action<IInitialize>? OnFinalized { get; set; } = null;
     public Action<IAssignable>? OnUnassigned { get; set; } = null;
@@ -24,6 +25,7 @@ public class GameManager : IEntity
     private IStateEnable _stateEnable = null!;
     private GameObjectFactory _gameObjectFactory = null!;
     private bool _initialized = false;
+    private ICamera _camera = null!;
 
     private GameObjectFactory GameObjectFactory
     {
@@ -52,6 +54,19 @@ public class GameManager : IEntity
         }
     }
 
+    public ICamera Camera
+    {
+        get => _camera;
+        set
+        {
+            if (_camera == value)
+                return;
+
+            _camera = value;
+            OnCameraChanged?.Invoke(this);
+        }
+    }
+
     public void RegisterGameObject(IGameObject gameObject)
     {
         if (_gameObjects.Contains(gameObject))
@@ -136,7 +151,7 @@ public class GameManager : IEntity
 
     public void Draw(SpriteBatch spriteBatch)
     {
-        spriteBatch.Begin();
+        spriteBatch.Begin(SpriteSortMode.Deferred, transformMatrix: Camera.MatrixTransform);
 
         foreach (var drawable in _drawables)
             drawable.Draw(spriteBatch);

Engine.Graphics/TwoDimensional/DisplayableSpriteBehaviour.cs

@@ -86,7 +86,7 @@ public class DisplayableSpriteBehaviour : Behaviour, IDisplayableSprite, IAssign
         Vector2 position = transform.Position;
         Vector2 scale = transform.Scale;
 
-        Rectangle rectangle = new Rectangle((int)position.X, (int)position.Y, (int)(Sprite.Texture2D.Width * scale.X), (int)(Sprite.Texture2D.Height * scale.Y));
+        Rectangle rectangle = new Rectangle((int)position.X, -(int)position.Y, (int)(Sprite.Texture2D.Width * scale.X), (int)(Sprite.Texture2D.Height * scale.Y));
 
         spriteBatch.Draw(Sprite.Texture2D, rectangle, null, Color, transform.Rotation, Origin, SpriteEffects, Depth);
     }