Fix palette issues with Oil Derricks and walls (fixes #501).

OpenRA.Mods.Cnc/CncWaterPaletteRotation.cs

@@ -0,0 +1,40 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2010 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 LICENSE.
+ */
+#endregion
+
+using System.Drawing;
+using OpenRA.Traits;
+using System.Collections.Generic;
+using OpenRA.FileFormats;
+
+namespace OpenRA.Mods.Cnc
+{
+	class CncWaterPaletteRotationInfo : TraitInfo<CncWaterPaletteRotation> {}
+
+	class CncWaterPaletteRotation : ITick, IPaletteModifier
+	{
+				
+		float t = 0;
+		public void Tick(Actor self)
+		{
+			t += .25f;
+		}
+
+		public void AdjustPalette(Dictionary<string,Palette> palettes)
+		{	
+			// Only modify the terrain palette
+			var pal = palettes["terrain"];
+							
+			var copy = (uint[])pal.Values.Clone();
+			var rotate = (int)t % 7;
+			for (int i = 0; i < 7; i++)
+				pal.SetColor(0x20 + (rotate + i) % 7, copy[0x20 + i]);			
+		}
+	}
+}