Added HitShapes

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

OpenRA.Mods.Common/HitShapes/Rectangle.cs

@@ -0,0 +1,80 @@
+#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 System.Linq;
+using OpenRA.Graphics;
+
+namespace OpenRA.Mods.Common.HitShapes
+{
+	public class RectangleShape : IHitShape
+	{
+		public WDist OuterRadius { get; private set; }
+
+		[FieldLoader.Require]
+		public readonly int2 TopLeft;
+
+		[FieldLoader.Require]
+		public readonly int2 BottomRight;
+
+		int2 quadrantSize;
+		int2 center;
+
+		WVec[] combatOverlayVerts;
+
+		public RectangleShape() { }
+
+		public RectangleShape(int2 tl, int2 br)
+		{
+			TopLeft = tl;
+			BottomRight = br;
+		}
+
+		public void Initialize()
+		{
+			if (TopLeft.X >= BottomRight.X || TopLeft.Y >= BottomRight.Y)
+				throw new YamlException("TopLeft and BottomRight points are invalid.");
+
+			quadrantSize = (BottomRight - TopLeft) / 2;
+			center = TopLeft + quadrantSize;
+
+			OuterRadius = new WDist(Math.Max(TopLeft.Length, BottomRight.Length));
+
+			combatOverlayVerts = new WVec[]
+			{
+				new WVec(TopLeft.X, TopLeft.Y, 0),
+				new WVec(BottomRight.X, TopLeft.Y, 0),
+				new WVec(BottomRight.X, BottomRight.Y, 0),
+				new WVec(TopLeft.X, BottomRight.Y, 0)
+			};
+		}
+
+		public WDist DistanceFromEdge(WVec v)
+		{
+			var r = new int2(
+				Math.Max(Math.Abs(v.X - center.X) - quadrantSize.X, 0),
+				Math.Max(Math.Abs(v.Y - center.Y) - quadrantSize.Y, 0));
+
+			return new WDist(r.Length);
+		}
+
+		public WDist DistanceFromEdge(WPos pos, Actor actor)
+		{
+			return DistanceFromEdge((pos - actor.CenterPosition).Rotate(-actor.Orientation));
+		}
+
+		public void DrawCombatOverlay(WorldRenderer wr, RgbaColorRenderer wcr, Actor actor)
+		{
+			var verts = combatOverlayVerts.Select(v => wr.ScreenPosition(actor.CenterPosition + v.Rotate(actor.Orientation)));
+			wcr.DrawPolygon(verts.ToArray(), 1, Color.Yellow);
+		}
+	}
+}