Add map beacons and radar pings

OpenRA.Mods.RA/Effects/Beacon.cs

@@ -0,0 +1,64 @@
+#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.Linq;
+using OpenRA.Effects;
+using OpenRA.Graphics;
+
+namespace OpenRA.Mods.RA.Effects
+{
+	public class Beacon : IEffect
+	{
+		readonly Player owner;
+		readonly WPos position;
+		readonly string palettePrefix;
+		readonly Animation arrow = new Animation("beacon");
+		readonly Animation circles = new Animation("beacon");
+		static readonly int maxArrowHeight = 512;
+		int arrowHeight = maxArrowHeight;
+		int arrowSpeed = 50;
+
+		public Beacon(Player owner, WPos position, int duration, string palettePrefix)
+		{
+			this.owner = owner;
+			this.position = position;
+			this.palettePrefix = palettePrefix;
+
+			arrow.Play("arrow");
+			circles.Play("circles");
+
+			owner.World.Add(new DelayedAction(duration, () => owner.World.Remove(this)));
+		}
+
+		public void Tick(World world)
+		{
+			arrowHeight += arrowSpeed;
+			var clamped = arrowHeight.Clamp(0, maxArrowHeight);
+			if (arrowHeight != clamped)
+			{
+				arrowHeight = clamped;
+				arrowSpeed *= -1;
+			}
+
+			arrow.Tick();
+			circles.Tick();
+		}
+
+		public IEnumerable<IRenderable> Render(WorldRenderer r)
+		{
+			if (!owner.IsAlliedWith(owner.World.RenderPlayer))
+				return SpriteRenderable.None;
+
+			var palette = r.Palette(palettePrefix + owner.InternalName);
+			return circles.Render(position, palette).Concat(arrow.Render(position + new WVec(0, 0, arrowHeight), palette));
+		}
+	}
+}