Hide explosions under fog.

OpenRA.Mods.RA/Effects/Explosion.cs

@@ -1,6 +1,6 @@
 #region Copyright & License Information
 /*
- * Copyright 2007-2011 The OpenRA Developers (see AUTHORS)
+ * Copyright 2007-2013 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,
@@ -17,20 +17,27 @@ namespace OpenRA.Mods.RA.Effects
 {
 	public class Explosion : IEffect
 	{
-		Animation anim;
+		World world;
 		WPos pos;
+		CPos cell;
+		Animation anim;
 
 		public Explosion(World world, WPos pos, string style)
 		{
+			this.world = world;
 			this.pos = pos;
+			this.cell = pos.ToCPos();
 			anim = new Animation("explosion");
 			anim.PlayThen(style, () => world.AddFrameEndTask(w => w.Remove(this)));
 		}
 
-		public void Tick( World world ) { anim.Tick(); }
+		public void Tick(World world) { anim.Tick(); }
 
 		public IEnumerable<IRenderable> Render(WorldRenderer wr)
 		{
+			if (world.FogObscures(cell))
+				return SpriteRenderable.None;
+
 			return anim.Render(pos, wr.Palette("effect"));
 		}
 	}