Create CellLayerBase

OpenRA.Game/Map/CellLayerBase.cs

@@ -0,0 +1,63 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2020 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, either version 3 of
+ * the License, or (at your option) any later version. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using OpenRA.Primitives;
+
+namespace OpenRA
+{
+	public abstract class CellLayerBase<T> : IEnumerable<T>
+	{
+		public readonly Size Size;
+		public readonly MapGridType GridType;
+
+		protected readonly T[] entries;
+		protected readonly Rectangle bounds;
+
+		public CellLayerBase(Map map)
+			: this(map.Grid.Type, new Size(map.MapSize.X, map.MapSize.Y)) { }
+
+		public CellLayerBase(MapGridType gridType, Size size)
+		{
+			Size = size;
+			bounds = new Rectangle(0, 0, Size.Width, Size.Height);
+			GridType = gridType;
+			entries = new T[size.Width * size.Height];
+		}
+
+		public virtual void CopyValuesFrom(CellLayerBase<T> anotherLayer)
+		{
+			if (Size != anotherLayer.Size || GridType != anotherLayer.GridType)
+				throw new ArgumentException("Layers must have a matching size and shape (grid type).", "anotherLayer");
+
+			Array.Copy(anotherLayer.entries, entries, entries.Length);
+		}
+
+		/// <summary>Clears the layer contents with a known value</summary>
+		public void Clear(T clearValue)
+		{
+			for (var i = 0; i < entries.Length; i++)
+				entries[i] = clearValue;
+		}
+
+		public IEnumerator<T> GetEnumerator()
+		{
+			return ((IEnumerable<T>)entries).GetEnumerator();
+		}
+
+		IEnumerator IEnumerable.GetEnumerator()
+		{
+			return GetEnumerator();
+		}
+	}
+}