generalize MoveFlash as parametrized SpriteEffect

OpenRA.Game/Effects/SpriteEffect.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 OpenRA.Graphics;
+
+namespace OpenRA.Effects
+{
+	public class SpriteEffect : IEffect
+	{
+		string palette;
+		Animation anim;
+		WPos pos;
+
+		public SpriteEffect(WPos pos, World world, string sprite, string palette)
+		{
+			this.pos = pos;
+			this.palette = palette;
+			anim = new Animation(world, sprite);
+			anim.PlayThen("idle", () => world.AddFrameEndTask(w => w.Remove(this)));
+		}
+
+		public void Tick(World world)
+		{
+			anim.Tick();
+		}
+
+		public IEnumerable<IRenderable> Render(WorldRenderer wr)
+		{
+			return anim.Render(pos, WVec.Zero, 0, wr.Palette(palette), 1f / wr.Viewport.Zoom);
+		}
+	}
+}