fixes #82

OpenRa.Game/GameRules/UnitInfo.cs

@@ -50,6 +50,7 @@ namespace OpenRa.Game.GameRules
 		public readonly int[] PrimaryOffset = { 0, 0 };
 		public readonly int[] SecondaryOffset = null;
 		public readonly int Recoil = 0;
+		public readonly string SecondaryAnim = null;
 
 		public UnitInfo(string name) { Name = name; }
 

OpenRa.Game/Traits/RenderUnitRotor.cs

@@ -8,13 +8,19 @@ namespace OpenRa.Game.Traits
 {
 	class RenderUnitRotor : RenderUnit
 	{
-		public Animation rotorAnim;
+		public Animation rotorAnim, secondRotorAnim;
 
 		public RenderUnitRotor( Actor self )
 			: base(self)
 		{
 			rotorAnim = new Animation(self.unitInfo.Name);
 			rotorAnim.PlayRepeating("rotor");
+
+			if (self.unitInfo.SecondaryAnim != null)
+			{
+				secondRotorAnim = new Animation(self.unitInfo.Name);
+				rotorAnim.PlayRepeating(self.unitInfo.SecondaryAnim);
+			}
 		}
 
 		public override IEnumerable<Pair<Sprite, float2>> Render(Actor self)
@@ -25,7 +31,7 @@ namespace OpenRa.Game.Traits
 			yield return Util.Centered(rotorAnim.Image, self.CenterLocation 
 				+ Util.GetTurretPosition(self, self.unitInfo.PrimaryOffset, 0));
 			if (self.unitInfo.SecondaryOffset != null)
-				yield return Util.Centered(rotorAnim.Image, self.CenterLocation
+				yield return Util.Centered((secondRotorAnim ?? rotorAnim).Image, self.CenterLocation
 					+ Util.GetTurretPosition(self, self.unitInfo.SecondaryOffset, 0));
 		}
 
@@ -33,6 +39,8 @@ namespace OpenRa.Game.Traits
 		{
 			base.Tick(self);
 			rotorAnim.Tick();
+			if (secondRotorAnim != null)
+				secondRotorAnim.Tick();
 		}
 	}
 }

sequences.xml

@@ -499,6 +499,9 @@
   <unit name="tran">
     <sequence name="idle" start="0" length="32" />
     <sequence name="rotor" start="0" length="4" src="lrotor" />
+    <sequence name="rotor2" start="0" length="4" src="rrotor" />
+    <sequence name="slow-rotor" start="4" length="8" src="lrotor" />
+    <sequence name="slow-rotor2" start="4" length="8" src="rrotor" />
   </unit>
   <unit name="v2">
     <sequence name="idle" start="0" length="32" />

units.ini

@@ -126,6 +126,7 @@ PrimaryOffset=0,14,0,-4
 SecondaryOffset=0,-14,0,-2
 BuiltAt=hpad
 Traits=Mobile, RenderUnitRotor
+SecondaryAnim=rotor2
 [HELI]
 Description=Longbow
 BuiltAt=hpad