splitting traits into own files

OpenRa.Game/Traits/RenderUnit.cs

@@ -0,0 +1,32 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using OpenRa.Game.Graphics;
+using IjwFramework.Types;
+
+namespace OpenRa.Game.Traits
+{
+	class RenderUnit : RenderSimple
+	{
+		public RenderUnit(Actor self)
+			: base(self)
+		{
+			anim.PlayFetchIndex("idle", () => self.traits.Get<Mobile>().facing);
+		}
+
+		protected static Pair<Sprite, float2> Centered(Sprite s, float2 location)
+		{
+			var loc = location - 0.5f * s.size;
+			return Pair.New(s, loc.Round());
+		}
+
+		public override IEnumerable<Pair<Sprite, float2>> Render(Actor self)
+		{
+			var mobile = self.traits.Get<Mobile>();
+			float fraction = (mobile.moveFraction > 0) ? (float)mobile.moveFraction / mobile.moveFractionTotal : 0f;
+			var centerLocation = new float2(12, 12) + 24 * float2.Lerp(mobile.fromCell, mobile.toCell, fraction);
+			yield return Centered(anim.Image, centerLocation);
+		}
+	}
+}