put AnimationWithOffset in its own file

OpenRA.Game/Graphics/AnimationWithOffset.cs

@@ -0,0 +1,51 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2011 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made 
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation. For more information,
+ * see COPYING.
+ */
+#endregion
+
+using System;
+using OpenRA.Traits;
+
+namespace OpenRA.Graphics
+{
+	public class AnimationWithOffset
+	{
+		public Animation Animation;
+		public Func<float2> OffsetFunc;
+		public Func<bool> DisableFunc;
+		public int ZOffset;
+
+		public AnimationWithOffset(Animation a)
+			: this(a, null, null)
+		{
+		}
+
+		public AnimationWithOffset(Animation a, Func<float2> o, Func<bool> d)
+		{
+			this.Animation = a;
+			this.OffsetFunc = o;
+			this.DisableFunc = d;
+		}
+
+		public Renderable Image(Actor self, string pal)
+		{
+			var p = self.CenterLocation;
+			var loc = p - 0.5f * Animation.Image.size
+				+ (OffsetFunc != null ? OffsetFunc() : float2.Zero);
+			var r = new Renderable(Animation.Image, loc, pal, p.Y);
+
+			return ZOffset != 0 ? r.WithZOffset(ZOffset) : r;
+		}
+
+		public static implicit operator AnimationWithOffset(Animation a)
+		{
+			return new AnimationWithOffset(a);
+		}
+	}
+}
+