homing weapons more or less work now

OpenRa.Game/Effects/Explosion.cs

@@ -0,0 +1,29 @@
+using System.Collections.Generic;
+using OpenRa.Game.Graphics;
+
+namespace OpenRa.Game.Effects
+{
+	class Explosion : IEffect
+	{
+		Animation anim;
+		int2 pos;
+
+		public Explosion(int2 pixelPos, int style, bool isWater)
+		{
+			this.pos = pixelPos;
+			var variantSuffix = isWater ? "w" : "";
+			anim = new Animation("explosion");
+				anim.PlayThen(style.ToString() + variantSuffix, 
+					() => Game.world.AddFrameEndTask(w => w.Remove(this)));
+		}
+
+		public void Tick() { anim.Tick(); }
+
+		public IEnumerable<Tuple<Sprite, float2, int>> Render()
+		{
+			yield return Tuple.New(anim.Image, pos.ToFloat2() - 0.5f * anim.Image.size, 0);
+		}
+
+		public Player Owner { get { return null; } }
+	}
+}