Add WithRangeCircle trait for drawing arbitrary ranges.

OpenRA.Mods.RA/OpenRA.Mods.RA.csproj

@@ -550,6 +550,7 @@
     <Compile Include="Warheads\GrantUpgradeWarhead.cs" />
     <Compile Include="Crates\GrantUpgradeCrateAction.cs" />
     <Compile Include="Scripting\Properties\UpgradeProperties.cs" />
+    <Compile Include="WithRangeCircle.cs" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\OpenRA.Game\OpenRA.Game.csproj">

OpenRA.Mods.RA/WithRangeCircle.cs

@@ -0,0 +1,76 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2014 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.Collections.Generic;
+using System.Drawing;
+using OpenRA.Graphics;
+using OpenRA.Mods.Common.Graphics;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.RA
+{
+	[Desc("Renders an arbitrary circle when selected or placing a structure")]
+	class WithRangeCircleInfo : ITraitInfo, IPlaceBuildingDecoration
+	{
+		[Desc("Type of range circle. used to decide which circles to draw on other structures during building placement.")]
+		public readonly string Type = null;
+
+		[Desc("Color of the circle")]
+		public readonly Color Color = Color.FromArgb(128, Color.White);
+
+		[Desc("Range of the circle")]
+		public readonly WRange Range = WRange.Zero;
+
+		public IEnumerable<IRenderable> Render(WorldRenderer wr, World w, ActorInfo ai, WPos centerPosition)
+		{
+			yield return new RangeCircleRenderable(
+				centerPosition,
+				Range,
+				0,
+				Color,
+				Color.FromArgb(96, Color.Black)
+			);
+
+			foreach (var a in w.ActorsWithTrait<WithRangeCircle>())
+				if (a.Actor.Owner == a.Actor.World.LocalPlayer && a.Trait.Info.Type == Type)
+					foreach (var r in a.Trait.RenderAfterWorld(wr))
+						yield return r;
+		}
+
+		public object Create(ActorInitializer init) { return new WithRangeCircle(init.self, this); }
+	}
+
+	class WithRangeCircle : IPostRenderSelection
+	{
+		public readonly WithRangeCircleInfo Info;
+		readonly Actor self;
+
+		public WithRangeCircle(Actor self, WithRangeCircleInfo info)
+		{
+			this.self = self;
+			Info = info;
+		}
+
+		public IEnumerable<IRenderable> RenderAfterWorld(WorldRenderer wr)
+		{
+			if (self.Owner != self.World.LocalPlayer)
+				yield break;
+
+			yield return new RangeCircleRenderable(
+				self.CenterPosition,
+				Info.Range,
+				0,
+				Info.Color,
+				Color.FromArgb(96, Color.Black)
+			);
+		}
+	}
+}
+