low power slowdown

OpenRa.Game/Player.cs

@@ -6,6 +6,8 @@ using OpenRa.Game.Traits;
 
 namespace OpenRa.Game
 {
+	enum PowerState { Normal, Low, Critical };
+
 	class Player
 	{
 		public int Palette;
@@ -65,6 +67,13 @@ namespace OpenRa.Game
 			return (float)Ore / GetOreCapacity();
 		}
 
+		public PowerState GetPowerState()
+		{
+			if (powerProvided >= powerDrained) return PowerState.Normal;
+			if (powerProvided > powerDrained / 2) return PowerState.Low;
+			return PowerState.Critical;
+		}
+
 		public int GetOreCapacity()
 		{
 			return Game.world.Actors