move projectile effects into mod

OpenRA.Mods.RA/Effects/Bullet.cs

@@ -0,0 +1,145 @@
+#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.Collections.Generic;
+using System.Linq;
+using OpenRA.Effects;
+using OpenRA.GameRules;
+using OpenRA.Graphics;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.RA.Effects
+{
+	public class BulletInfo : IProjectileInfo
+	{
+		public readonly int Speed = 1;
+		public readonly string Trail = null;
+		public readonly float Inaccuracy = 0;			// pixels at maximum range
+		public readonly string Image = null;
+		public readonly bool High = false;
+		public readonly bool Arcing = false;
+		public readonly int RangeLimit = 0;
+		public readonly int Arm = 0;
+		public readonly bool Shadow = false;
+		public readonly bool Proximity = false;
+
+		public IEffect Create(ProjectileArgs args) { return new Bullet( this, args ); }
+	}
+
+	public class Bullet : IEffect
+	{
+		readonly BulletInfo Info;
+		readonly ProjectileArgs Args;
+		
+		int t = 0;
+		Animation anim;
+
+		const int BaseBulletSpeed = 100;		/* pixels / 40ms frame */
+
+		public Bullet(BulletInfo info, ProjectileArgs args)
+		{
+			Info = info;
+			Args = args;
+
+			if (info.Inaccuracy > 0)
+			{
+				var factor = ((Args.dest - Args.src).Length / Game.CellSize) / args.weapon.Range;
+				Args.dest += (info.Inaccuracy * factor * args.firedBy.World.SharedRandom.Gauss2D(2)).ToInt2();
+			}
+
+			if (Info.Image != null)
+			{
+				anim = new Animation(Info.Image, () => Traits.Util.GetFacing(Args.dest - Args.src, 0));
+				anim.PlayRepeating("idle");
+			}
+		}
+
+		int TotalTime() { return (Args.dest - Args.src).Length * BaseBulletSpeed / Info.Speed; }
+
+		public void Tick( World world )
+		{
+			t += 40;
+
+			if (anim != null) anim.Tick();
+
+			if (t > TotalTime()) Explode( world );
+
+			if (Info.Trail != null)
+			{
+				var at = (float)t / TotalTime();
+				var altitude = float2.Lerp(Args.srcAltitude, Args.destAltitude, at);
+				var pos = float2.Lerp(Args.src, Args.dest, at) - new float2(0, altitude);
+
+				var highPos = (Info.High || Info.Arcing)
+					? (pos - new float2(0, (Args.dest - Args.src).Length * height * 4 * at * (1 - at)))
+					: pos;
+
+				world.AddFrameEndTask(w => w.Add(
+					new Smoke(w, highPos.ToInt2(), Info.Trail)));
+			}
+
+			if (!Info.High)		// check for hitting a wall
+			{
+				var at = (float)t / TotalTime();
+				var pos = float2.Lerp(Args.src, Args.dest, at);
+				var cell = Traits.Util.CellContaining(pos);
+
+				if (world.WorldActor.traits.Get<UnitInfluence>().GetUnitsAt(cell).Any(
+					a => a.traits.Contains<IBlocksBullets>()))
+				{
+					Args.dest = pos.ToInt2();
+					Explode(world);
+				}
+			}
+		}
+
+		const float height = .1f;
+
+		public IEnumerable<Renderable> Render()
+		{
+			if (anim != null)
+			{
+				var at = (float)t / TotalTime();
+
+				var altitude = float2.Lerp(Args.srcAltitude, Args.destAltitude, at);
+				var pos = float2.Lerp(Args.src, Args.dest, at) - new float2(0, altitude);
+
+				if (Info.High || Info.Arcing)
+				{
+					if (Info.Shadow)
+						yield return new Renderable(anim.Image, pos - .5f * anim.Image.size, "shadow");
+
+					var highPos = pos - new float2(0, (Args.dest - Args.src).Length * height * 4 * at * (1 - at));
+
+					yield return new Renderable(anim.Image, highPos - .5f * anim.Image.size, Args.firedBy.Owner.Palette);
+				}
+				else
+					yield return new Renderable(anim.Image, pos - .5f * anim.Image.size,
+						Args.weapon.Underwater ? "shadow" : Args.firedBy.Owner.Palette);
+			}
+		}
+
+		void Explode( World world )
+		{
+			world.AddFrameEndTask(w => w.Remove(this));
+			Combat.DoImpacts(Args);
+		}
+	}
+}