Everything is now OpenRA, not OpenRa

OpenRA.Game/Effects/Missile.cs

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+#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 OpenRA.GameRules;
+using OpenRA.Graphics;
+using OpenRA.Traits;
+
+namespace OpenRA.Effects
+{
+	class Missile : IEffect
+	{
+		readonly Actor FiredBy;
+		readonly WeaponInfo Weapon;
+		readonly ProjectileInfo Projectile;
+		readonly WarheadInfo Warhead;
+		float2 Pos;
+		readonly Actor Target;
+		readonly Animation anim;
+		int Facing;
+		int t;
+		int Altitude;
+
+		public Missile(WeaponInfo weapon, Player owner, Actor firedBy,
+			int2 src, Actor target, int altitude, int facing)
+		{
+			Weapon = weapon;
+			Projectile = Rules.ProjectileInfo[Weapon.Projectile];
+			Warhead = Rules.WarheadInfo[Weapon.Warhead];
+			FiredBy = firedBy;
+			Target = target;
+			Pos = src.ToFloat2();
+			Altitude = altitude;
+			Facing = facing;
+
+			if (Projectile.Image != null && Projectile.Image != "none")
+			{
+				if (Projectile.Rotates)
+					anim = new Animation(Projectile.Image, () => Facing);
+				else
+					anim = new Animation(Projectile.Image);
+
+				anim.PlayRepeating("idle");
+			}
+		}
+
+		const int MissileCloseEnough = 7;
+		const float Scale = .2f;
+
+		public void Tick( World world )
+		{
+			t += 40;
+
+			var targetUnit = Target.traits.GetOrDefault<Unit>();
+			var targetAltitude = targetUnit != null ? targetUnit.Altitude : 0;
+			Altitude += Math.Sign(targetAltitude - Altitude);
+
+			Traits.Util.TickFacing(ref Facing, 
+				Traits.Util.GetFacing(Target.CenterLocation - Pos, Facing),
+				Projectile.ROT);
+
+			anim.Tick();
+
+			var dist = Target.CenterLocation - Pos;
+			if (dist.LengthSquared < MissileCloseEnough * MissileCloseEnough || Target.IsDead)
+				Explode(world);
+
+			var speed = Scale * Weapon.Speed * ((targetAltitude > 0 && Weapon.TurboBoost) ? 1.5f : 1f);
+
+			var angle = Facing / 128f * Math.PI;
+			var move = speed * -float2.FromAngle((float)angle);
+			Pos += move;
+
+			if (Projectile.Trail != null)
+				world.AddFrameEndTask(w => w.Add(
+					new Smoke(w, (Pos - 1.5f * move - new int2( 0, Altitude )).ToInt2(), Projectile.Trail)));
+
+			if (Projectile.RangeLimit != 0 && t > Projectile.RangeLimit * 40)
+				Explode(world);
+		}
+
+		void Explode(World world)
+		{
+			world.AddFrameEndTask(w => w.Remove(this));
+
+			if (t > Projectile.Arm * 40)	/* don't blow up in our launcher's face! */
+				Combat.DoImpact(Pos.ToInt2(), Pos.ToInt2(), Weapon, Projectile, Warhead, FiredBy);
+			return;
+		}
+
+		public IEnumerable<Renderable> Render()
+		{
+			yield return new Renderable(anim.Image, Pos - 0.5f * anim.Image.size - new float2(0, Altitude), "effect");
+		}
+	}
+}