Camera in functional state.

RhythmBullet/Zer01HD/Utilities/Camera/Camera2D.cs

@@ -8,18 +8,28 @@ using System.Threading.Tasks;
 
 namespace RhythmBullet.Zer01HD.Utilities.Camera
 {
-    class Camera2D
+    public class Camera2D
     {
         public float Zoom;
         public Vector2 Position;
-        public Matrix Transform { get; private set; }
-        
-        public void Update(Viewport viewport)
+        public Matrix TransformMatrix { get; private set; }
+        public GraphicsDevice graphicsDevice;
+
+        public Camera2D(GraphicsDevice graphicsDevice)
         {
-            Transform = 
-                Matrix.CreateTranslation(new Vector3(Position.X, Position.Y, 0)) * 
+            this.graphicsDevice = graphicsDevice;
+            Zoom = 1f;
+            Position.X = this.graphicsDevice.Viewport.Width * 0.5f;
+            Position.Y = this.graphicsDevice.Viewport.Height * 0.5f;
+        }
+
+        public void Update()
+        {
+            Rectangle bounds = graphicsDevice.Viewport.Bounds;
+            TransformMatrix = 
+                Matrix.CreateTranslation(new Vector3(-Position.X, -Position.Y, 0)) * 
                 Matrix.CreateScale(Zoom) * 
-                Matrix.CreateTranslation(new Vector3(viewport.Width/2f, viewport.Height/2f, 0f));   
+                Matrix.CreateTranslation(new Vector3(bounds.Width * 0.5f, bounds.Height * 0.5f, 0f));
         }
     }
 }