move projectile effects into mod

OpenRA.Mods.RA/Effects/TeslaZap.cs

@@ -0,0 +1,132 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007,2009,2010 Chris Forbes, Robert Pepperell, Matthew Bowra-Dean, Paul Chote, Alli Witheford.
+ * This file is part of OpenRA.
+ * 
+ *  OpenRA is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ * 
+ *  OpenRA is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ * 
+ *  You should have received a copy of the GNU General Public License
+ *  along with OpenRA.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using OpenRA.Effects;
+using OpenRA.GameRules;
+using OpenRA.Graphics;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.RA.Effects
+{
+	class TeslaZapInfo : IProjectileInfo
+	{
+		public IEffect Create(ProjectileArgs args) { return new TeslaZap( this, args ); }
+	}
+
+	class TeslaZap : IEffect
+	{
+		readonly ProjectileArgs Args;
+		int timeUntilRemove = 2; // # of frames
+		bool doneDamage = false;
+
+		const int numZaps = 3;
+
+		readonly List<Renderable> renderables = new List<Renderable>();
+
+		public TeslaZap(TeslaZapInfo info, ProjectileArgs args)
+		{
+			Args = args;
+			var bright = SequenceProvider.GetSequence("litning", "bright");
+			var dim = SequenceProvider.GetSequence("litning", "dim");
+
+			for (var n = 0; n < numZaps; n++)
+				renderables.AddRange(DrawZapWandering(args.src, args.dest, n == numZaps - 1 ? bright : dim));
+		}
+
+		public void Tick( World world )
+		{
+			if( timeUntilRemove <= 0 )
+				world.AddFrameEndTask( w => w.Remove( this ) );
+			--timeUntilRemove;
+
+			if (!doneDamage)
+			{
+				Combat.DoImpacts(Args);
+				doneDamage = true;
+			}
+		}
+
+		public IEnumerable<Renderable> Render() { return renderables; }
+
+		static IEnumerable<Renderable> DrawZapWandering(int2 from, int2 to, Sequence s)
+		{
+			var z = float2.Zero;	/* hack */
+			var dist = to - from;
+			var norm = (1f / dist.Length) * new float2(-dist.Y, dist.X);
+
+			var renderables = new List<Renderable>();
+			if (Game.CosmeticRandom.Next(2) != 0)
+			{
+				var p1 = from + (1 / 3f) * dist.ToFloat2() + Game.CosmeticRandom.Gauss1D(1) * .2f * dist.Length * norm;
+				var p2 = from + (2 / 3f) * dist.ToFloat2() + Game.CosmeticRandom.Gauss1D(1) * .2f * dist.Length * norm;
+
+				renderables.AddRange(DrawZap(from, p1, s, out p1));
+				renderables.AddRange(DrawZap(p1, p2, s, out p2));
+				renderables.AddRange(DrawZap(p2, to, s, out z));
+			}
+			else
+			{
+				var p1 = from + (1 / 2f) * dist.ToFloat2() + Game.CosmeticRandom.Gauss1D(1) * .2f * dist.Length * norm;
+
+				renderables.AddRange(DrawZap(from, p1, s, out p1));
+				renderables.AddRange(DrawZap(p1, to, s, out z));
+			}
+
+			return renderables;
+		}
+
+		static IEnumerable<Renderable> DrawZap(float2 from, float2 to, Sequence s, out float2 p)
+		{
+			var dist = to - from;
+			var q = new float2(-dist.Y, dist.X);
+			var c = -float2.Dot(from, q);
+			var rs = new List<Renderable>();
+			var z = from;
+
+			while ((to - z).X > 5 || (to - z).X < -5 || (to - z).Y > 5 || (to - z).Y < -5)
+			{
+				var step = steps.Where(t => (to - (z + new float2(t[0],t[1]))).LengthSquared < (to - z).LengthSquared )
+					.OrderBy(t => Math.Abs(float2.Dot(z + new float2(t[0], t[1]), q) + c)).First();
+
+				rs.Add(new Renderable(s.GetSprite(step[4]), z + new float2(step[2], step[3]), "effect"));
+				z += new float2(step[0], step[1]);
+			}
+
+			p = z;
+
+			return rs;
+		}
+
+		static int[][] steps = new [] 
+		{ 
+			new int[] { 8, 8, -8, -8, 0 },
+			new int[] { -8, -8, -16, -16, 0 },
+			new int[] { 8, 0, -8, -8, 1 },
+			new int[] { -8, 0, -16, -8, 1 },
+			new int[] { 0, 8, -8, -8, 2 },
+			new int[] { 0, -8, -8, -16, 2 },
+			new int[] { -8, 8, -16, -8, 3 },
+			new int[] { 8, -8, -8, -16, 3 }
+		};
+	}
+}