Added HitShapes

New IHitShape interface.
Added Circle, Capsule and Rectangle shapes.

OpenRA.Mods.Common/HitShapes/Circle.cs

@@ -0,0 +1,46 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2015 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation. For more information,
+ * see COPYING.
+ */
+#endregion
+
+using System;
+using System.Drawing;
+using OpenRA.Graphics;
+using OpenRA.Mods.Common.Graphics;
+
+namespace OpenRA.Mods.Common.HitShapes
+{
+	public class CircleShape : IHitShape
+	{
+		public WDist OuterRadius { get { return Radius; } }
+
+		[FieldLoader.Require]
+		public readonly WDist Radius = new WDist(426);
+
+		public CircleShape() { }
+
+		public CircleShape(WDist radius) { Radius = radius; }
+
+		public void Initialize() { }
+
+		public WDist DistanceFromEdge(WVec v)
+		{
+			return new WDist(Math.Max(0, v.Length - Radius.Length));
+		}
+
+		public WDist DistanceFromEdge(WPos pos, Actor actor)
+		{
+			return DistanceFromEdge(pos - actor.CenterPosition);
+		}
+
+		public void DrawCombatOverlay(WorldRenderer wr, RgbaColorRenderer wcr, Actor actor)
+		{
+			RangeCircleRenderable.DrawRangeCircle(wr, actor.CenterPosition, Radius, 1, Color.Yellow, 0, Color.Yellow);
+		}
+	}
+}