Added HitShapes

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

OpenRA.Mods.Common/HitShapes/Capsule.cs

@@ -0,0 +1,93 @@
+#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 CapsuleShape : IHitShape
+	{
+		public WDist OuterRadius { get; private set; }
+
+		[FieldLoader.Require]
+		public readonly int2 PointA;
+
+		[FieldLoader.Require]
+		public readonly int2 PointB;
+
+		public readonly WDist Radius = new WDist(426);
+
+		int2 ab;
+		int abLenSq;
+
+		public CapsuleShape() { }
+
+		public CapsuleShape(int2 a, int2 b, WDist radius)
+		{
+			PointA = a;
+			PointB = b;
+			Radius = radius;
+		}
+
+		public void Initialize()
+		{
+			ab = PointB - PointA;
+			abLenSq = ab.LengthSquared / 1024;
+
+			if (abLenSq == 0)
+				throw new YamlException("This Capsule describes a circle. Use a Circle HitShape instead.");
+
+			OuterRadius = Radius + new WDist(Math.Max(PointA.Length, PointB.Length));
+		}
+
+		public WDist DistanceFromEdge(WVec v)
+		{
+			var p = new int2(v.X, v.Y);
+
+			var t = int2.Dot(p - PointA, ab) / abLenSq;
+
+			if (t < 0)
+				return new WDist(Math.Max(0, (PointA - p).Length - Radius.Length));
+			if (t > 1024)
+				return new WDist(Math.Max(0, (PointB - p).Length - Radius.Length));
+
+			var projection = PointA + new int2(
+				(ab.X * t) / 1024,
+				(ab.Y * t) / 1024);
+
+			var distance = (projection - p).Length;
+
+			return new WDist(Math.Max(0, distance - Radius.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 a = actor.CenterPosition + new WVec(PointA.X, PointA.Y, 0).Rotate(actor.Orientation);
+			var b = actor.CenterPosition + new WVec(PointB.X, PointB.Y, 0).Rotate(actor.Orientation);
+
+			var offset = new WVec(a.Y - b.Y, b.X - a.X, 0);
+			offset = offset * Radius.Length / offset.Length;
+
+			var c = Color.Yellow;
+			RangeCircleRenderable.DrawRangeCircle(wr, a, Radius, 1, c, 0, c);
+			RangeCircleRenderable.DrawRangeCircle(wr, b, Radius, 1, c, 0, c);
+			wcr.DrawLine(new[] { wr.ScreenPosition(a - offset), wr.ScreenPosition(b - offset) }, 1, c);
+			wcr.DrawLine(new[] { wr.ScreenPosition(a + offset), wr.ScreenPosition(b + offset) }, 1, c);
+		}
+	}
+}