Extract MapCoordsRegion from CellRegion.

OpenRA.Game/Map/MapCoordsRegion.cs

@@ -0,0 +1,89 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2015 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 System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace OpenRA
+{
+	public struct MapCoordsRegion : IEnumerable<MPos>
+	{
+		public struct MapCoordsEnumerator : IEnumerator<MPos>
+		{
+			readonly MapCoordsRegion r;
+			MPos current;
+
+			public MapCoordsEnumerator(MapCoordsRegion region)
+				: this()
+			{
+				r = region;
+				Reset();
+			}
+
+			public bool MoveNext()
+			{
+				var u = current.U + 1;
+				var v = current.V;
+
+				// Check for column overflow
+				if (u > r.bottomRight.U)
+				{
+					v += 1;
+					u = r.topLeft.U;
+
+					// Check for row overflow
+					if (v > r.bottomRight.V)
+						return false;
+				}
+
+				current = new MPos(u, v);
+				return true;
+			}
+
+			public void Reset()
+			{
+				current = new MPos(r.topLeft.U - 1, r.topLeft.V);
+			}
+
+			public MPos Current { get { return current; } }
+			object IEnumerator.Current { get { return Current; } }
+			public void Dispose() { }
+		}
+
+		readonly MPos topLeft;
+		readonly MPos bottomRight;
+
+		public MapCoordsRegion(MPos mapTopLeft, MPos mapBottomRight)
+		{
+			this.topLeft = mapTopLeft;
+			this.bottomRight = mapBottomRight;
+		}
+
+		public MapCoordsEnumerator GetEnumerator()
+		{
+			return new MapCoordsEnumerator(this);
+		}
+
+		IEnumerator<MPos> IEnumerable<MPos>.GetEnumerator()
+		{
+			return GetEnumerator();
+		}
+
+		IEnumerator IEnumerable.GetEnumerator()
+		{
+			return GetEnumerator();
+		}
+
+		public MPos TopLeft { get { return topLeft; } }
+		public MPos BottomRight { get { return bottomRight; } }
+	}
+}