Draw targeting lines for player-issued orders. Can force-display targets with [alt].

OpenRA.Game/Traits/DrawLineToTarget.cs

@@ -0,0 +1,69 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2010 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 LICENSE.
+ */
+#endregion
+
+using System.Drawing;
+
+namespace OpenRA.Traits
+{
+	public class DrawLineToTargetInfo : ITraitInfo
+	{
+		public readonly int Ticks = 60;
+
+		public virtual object Create(ActorInitializer init) { return new DrawLineToTarget(this); }
+	}
+
+	public class DrawLineToTarget :IRenderSelection
+	{
+		DrawLineToTargetInfo Info;
+		public DrawLineToTarget(DrawLineToTargetInfo info)
+		{
+			this.Info = info;
+		}
+		
+		Actor target;
+		float2 pos;
+		int lifetime;
+		Color c;
+		public void SetTarget(Actor self, int2 cell, Color c)
+		{
+			pos = Game.CellSize * (cell + new float2(0.5f, 0.5f));
+			lifetime = Info.Ticks;
+			target = null;
+			this.c = c;
+		}
+		
+		public void SetTarget(Actor self, Actor target, Color c)
+		{
+			this.target = target;
+			lifetime = Info.Ticks;
+			this.c = c;
+		}
+		
+		public void Render (Actor self)
+		{
+			var force = Game.controller.GetModifiers().HasModifier(Modifiers.Alt);
+			if ((lifetime <= 0 || --lifetime <= 0) && !force)
+				return;
+			
+			var p = (target != null) ? target.CenterLocation : pos;
+			
+			Game.Renderer.LineRenderer.DrawLine(self.CenterLocation, p, c, c);
+			for (bool b = false; !b; p = self.CenterLocation, b = true) 
+			{
+				Game.Renderer.LineRenderer.DrawLine(p + new float2(-1, -1), p + new float2(-1, 1), c, c);
+				Game.Renderer.LineRenderer.DrawLine(p + new float2(-1, 1), p + new float2(1, 1), c, c);
+				Game.Renderer.LineRenderer.DrawLine(p + new float2(1, 1), p + new float2(1, -1), c, c);
+				Game.Renderer.LineRenderer.DrawLine(p + new float2(1, -1), p + new float2(-1, -1), c, c);
+			}
+			Game.Renderer.LineRenderer.Flush();
+		}
+	}
+}
+