GPS satellite launch animation

OpenRa.Game/Effects/SatelliteLaunch.cs

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+using System.Collections.Generic;
+using OpenRa.Game.Graphics;
+using OpenRa.Game.Traits;
+
+namespace OpenRa.Game.Effects
+{
+	class SatelliteLaunch : IEffect
+	{
+		int frame = 0;
+		Actor a;
+		Animation doors = new Animation("atek");
+		float2 doorOffset = new float2(-4,0);
+
+		public SatelliteLaunch(Actor a)
+		{
+			this.a = a;
+			doors.PlayThen("active",
+				() => Game.world.AddFrameEndTask(w => w.Remove(this)));
+		}
+
+		public void Tick()
+		{
+			doors.Tick();
+			
+			if (++frame == 19)
+			{
+				Game.world.AddFrameEndTask(w => w.Add(new GpsSatellite(a.CenterLocation - .5f * doors.Image.size + doorOffset)));
+			}
+		}
+		
+		public IEnumerable<Renderable> Render()
+		{
+			yield return new Renderable(doors.Image,
+				a.CenterLocation - .5f * doors.Image.size + doorOffset, PaletteType.Gold);
+		}
+	}
+}