move projectile effects into mod

OpenRA.Mods.RA/Effects/Missile.cs

@@ -0,0 +1,138 @@
+#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 MissileInfo : IProjectileInfo
+	{
+		public readonly int Speed = 1;
+		public readonly int Arm = 0;
+		public readonly bool High = false;
+		public readonly bool Shadow = true;
+		public readonly bool Proximity = false;
+		public readonly string Trail = null;
+		public readonly float Inaccuracy = 0;
+		public readonly string Image = null;
+		public readonly int ROT = 5;
+		public readonly int RangeLimit = 0;
+		public readonly bool TurboBoost = false;
+
+		public IEffect Create(ProjectileArgs args) { return new Missile( this, args ); }
+	}
+
+	class Missile : IEffect
+	{
+		readonly MissileInfo Info;
+		readonly ProjectileArgs Args;
+
+		int2 offset;
+		float2 Pos;
+		readonly Animation anim;
+		int Facing;
+		int t;
+		int Altitude;
+
+		public Missile(MissileInfo info, ProjectileArgs args)
+		{
+			Info = info;
+			Args = args;
+
+			Pos = Args.src;
+			Altitude = Args.srcAltitude;
+			Facing = Args.facing;
+
+			if (info.Inaccuracy > 0)
+				offset = (info.Inaccuracy * args.firedBy.World.SharedRandom.Gauss2D(2)).ToInt2();
+
+			if (Info.Image != null)
+			{
+				anim = new Animation(Info.Image, () => Facing);
+				anim.PlayRepeating("idle");
+			}
+		}
+
+		const int MissileCloseEnough = 7;
+		const float Scale = .2f;
+
+		public void Tick( World world )
+		{
+			t += 40;
+
+			var targetPosition = Args.target.CenterLocation + offset;
+
+			var targetUnit = Args.target.traits.GetOrDefault<Unit>();
+			var targetAltitude = targetUnit != null ? targetUnit.Altitude : 0;
+			Altitude += Math.Sign(targetAltitude - Altitude);
+
+			Traits.Util.TickFacing(ref Facing,
+				Traits.Util.GetFacing(targetPosition - Pos, Facing),
+				Info.ROT);
+
+			anim.Tick();
+
+			var dist = targetPosition - Pos;
+			if (dist.LengthSquared < MissileCloseEnough * MissileCloseEnough || Args.target.IsDead)
+				Explode(world);
+
+			var speed = Scale * Info.Speed * ((targetAltitude > 0 && Info.TurboBoost) ? 1.5f : 1f);
+
+			var angle = Facing / 128f * Math.PI;
+			var move = speed * -float2.FromAngle((float)angle);
+			Pos += move;
+
+			if (Info.Trail != null)
+				world.AddFrameEndTask(w => w.Add(
+					new Smoke(w, (Pos - 1.5f * move - new int2(0, Altitude)).ToInt2(), Info.Trail)));
+
+			if (Info.RangeLimit != 0 && t > Info.RangeLimit * 40)
+				Explode(world);
+
+			if (!Info.High)		// check for hitting a wall
+			{
+				var cell = Traits.Util.CellContaining(Pos);
+
+				if (world.WorldActor.traits.Get<UnitInfluence>().GetUnitsAt(cell).Any(
+					a => a.traits.Contains<IBlocksBullets>()))
+					Explode(world);
+			}
+		}
+
+		void Explode(World world)
+		{
+			world.AddFrameEndTask(w => w.Remove(this));
+			Args.dest = Pos.ToInt2();
+			if (t > Info.Arm * 40)	/* don't blow up in our launcher's face! */
+				Combat.DoImpacts(Args);
+		}
+
+		public IEnumerable<Renderable> Render()
+		{
+			yield return new Renderable(anim.Image, Pos - 0.5f * anim.Image.size - new float2(0, Altitude), "effect");
+		}
+	}
+}