partial ConnectedComponents labeler; fixes bugs in Evaluator

OpenRA.FileFormats/ConnectedComponents.cs

@@ -0,0 +1,36 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace OpenRA.FileFormats
+{
+	public static class ConnectedComponents
+	{
+		static readonly int2[] Neighbors 
+			= { new int2(-1, -1), new int2(0, -1), new int2(1, -1), new int2(-1, 0) };
+
+		public static int[,] Extract(Map m, Func<int, int, int> f)
+		{
+			var result = new int[m.MapSize, m.MapSize];
+			var types = new int[m.MapSize, m.MapSize];
+			var d = new Dictionary<int,int>();
+			var n = 1;
+
+			for( var j = m.YOffset; j < m.YOffset + m.Height; j++ )
+				for (var i = m.XOffset; i < m.XOffset + m.Width; i++)
+				{
+					types[i, j] = f(i, j);
+
+					var k = n;
+					foreach (var a in Neighbors)
+						if (types[i + a.X, j + a.Y] == types[i, j] && result[i + a.X, j + a.Y] < k)
+							k = result[i + a.X, j + a.Y];
+
+					// todo: finish this
+				}
+
+			return result;
+		}
+	}
+}