Move Common Modifiers and PaletteEffects into Traits space

OpenRA.Mods.Common/Traits/PaletteEffects/NukePaletteEffect.cs

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+#region Copyright & License Information
+/*
+ * Copyright 2007-2014 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.Collections.Generic;
+using System.Drawing;
+using OpenRA.Graphics;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	[Desc("Apply palette full screen rotations during atom bomb explosions. Add this to the world actor.")]
+	class NukePaletteEffectInfo : TraitInfo<NukePaletteEffect> { }
+
+	public class NukePaletteEffect : IPaletteModifier, ITick
+	{
+		const int nukeEffectLength = 20;
+		int remainingFrames;
+
+		public void Enable()
+		{
+			remainingFrames = nukeEffectLength;
+		}
+
+		public void Tick(Actor self)
+		{
+			if (remainingFrames > 0)
+				remainingFrames--;
+		}
+
+		public void AdjustPalette(IReadOnlyDictionary<string, MutablePalette> palettes)
+		{
+			if (remainingFrames == 0)
+				return;
+
+			var frac = (float)remainingFrames / nukeEffectLength;
+
+			foreach (var pal in palettes)
+			{
+				for (var x = 0; x < Palette.Size; x++)
+				{
+					var orig = pal.Value.GetColor(x);
+					var white = Color.FromArgb(orig.A, 255, 255, 255);
+					pal.Value.SetColor(x, Exts.ColorLerp(frac, orig, white));
+				}
+			}
+		}
+	}
+}