Mods.Common Effects

Moved over more effects to Mods.Common

OpenRA.Mods.Common/Effects/Beacon.cs

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+#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;
+using System.Collections.Generic;
+using OpenRA.Effects;
+using OpenRA.Graphics;
+
+namespace OpenRA.Mods.Common.Effects
+{
+	public class Beacon : IEffect
+	{
+		readonly Player owner;
+		readonly WPos position;
+		readonly string palettePrefix;
+		readonly string posterPalette;
+		readonly Animation arrow;
+		readonly Animation circles;
+		readonly Animation poster;
+		readonly Animation clock;
+
+		static readonly int maxArrowHeight = 512;
+		int arrowHeight = maxArrowHeight;
+		int arrowSpeed = 50;
+
+		// Player-placed beacons are removed after a delay
+		public Beacon(Player owner, WPos position, int duration, string palettePrefix)
+		{
+			this.owner = owner;
+			this.position = position;
+			this.palettePrefix = palettePrefix;
+
+			arrow = new Animation(owner.World, "beacon");
+			circles = new Animation(owner.World, "beacon");
+
+			arrow.Play("arrow");
+			circles.Play("circles");
+
+			if (duration > 0)
+				owner.World.Add(new DelayedAction(duration, () => owner.World.Remove(this)));
+		}
+
+		// Support power beacons are expected to clean themselves up
+		public Beacon(Player owner, WPos position, string palettePrefix, string posterType, string posterPalette, Func<float> clockFraction)
+			: this(owner, position, -1, palettePrefix)
+		{
+			this.posterPalette = posterPalette;
+
+			if (posterType != null)
+			{
+				poster = new Animation(owner.World, "beacon");
+				poster.Play(posterType);
+
+				if (clockFraction != null)
+				{
+					clock = new Animation(owner.World, "beacon");
+					clock.PlayFetchIndex("clock", () => Exts.Clamp((int)(clockFraction() * (clock.CurrentSequence.Length - 1)), 0, clock.CurrentSequence.Length - 1));
+				}
+			}
+		}
+
+		public void Tick(World world)
+		{
+			arrowHeight += arrowSpeed;
+			var clamped = arrowHeight.Clamp(0, maxArrowHeight);
+			if (arrowHeight != clamped)
+			{
+				arrowHeight = clamped;
+				arrowSpeed *= -1;
+			}
+
+			arrow.Tick();
+			circles.Tick();
+
+			if (clock != null)
+				clock.Tick();
+		}
+
+		public IEnumerable<IRenderable> Render(WorldRenderer r)
+		{
+			if (!owner.IsAlliedWith(owner.World.RenderPlayer))
+				yield break;
+
+			var palette = r.Palette(palettePrefix + owner.InternalName);
+			foreach (var a in circles.Render(position, palette))
+				yield return a;
+				
+			foreach (var a in arrow.Render(position + new WVec(0, 0, arrowHeight), palette))
+				yield return a;
+
+			if (poster != null)
+			{
+				foreach (var a in poster.Render(position, r.Palette(posterPalette)))
+					yield return a;
+
+				if (clock != null)
+					foreach (var a in clock.Render(position, r.Palette(posterPalette)))
+						yield return a;
+			}
+		}
+	}
+}

OpenRA.Mods.Common/Effects/Bullet.cs

@@ -0,0 +1,179 @@
+#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;
+using System.Collections.Generic;
+using System.Drawing;
+using System.Linq;
+using OpenRA.Effects;
+using OpenRA.GameRules;
+using OpenRA.Graphics;
+using OpenRA.Mods.Common.Graphics;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Effects
+{
+	public class BulletInfo : IProjectileInfo
+	{
+		[Desc("Projectile speed in WRange / tick, two values indicate variable velocity")]
+		public readonly WRange[] Speed = { new WRange(17) };
+		public readonly string Trail = null;
+		[Desc("Maximum offset at the maximum range")]
+		public readonly WRange Inaccuracy = WRange.Zero;
+		public readonly string Image = null;
+		[Desc("Check for whether an actor with BlocksBullets: trait blocks fire")]
+		public readonly bool High = false;
+		public readonly bool Shadow = false;
+		[Desc("Arc in WAngles, two values indicate variable arc.")]
+		public readonly WAngle[] Angle = { WAngle.Zero };
+		public readonly int TrailInterval = 2;
+		public readonly int TrailDelay = 1;
+		public readonly int ContrailLength = 0;
+		public readonly Color ContrailColor = Color.White;
+		public readonly bool ContrailUsePlayerColor = false;
+		public readonly int ContrailDelay = 1;
+
+		public IEffect Create(ProjectileArgs args) { return new Bullet(this, args); }
+	}
+
+	public class Bullet : IEffect, ISync
+	{
+		readonly BulletInfo info;
+		readonly ProjectileArgs args;
+		[Sync] readonly WAngle angle;
+		[Sync] readonly WRange speed;
+
+		ContrailRenderable trail;
+		Animation anim;
+
+		[Sync] WPos pos, target;
+		[Sync] int length;
+		[Sync] int facing;
+		[Sync] int ticks, smokeTicks;
+
+		[Sync] public Actor SourceActor { get { return args.SourceActor; } }
+
+		public Bullet(BulletInfo info, ProjectileArgs args)
+		{
+			this.info = info;
+			this.args = args;
+			this.pos = args.Source;
+
+			var world = args.SourceActor.World;
+
+			if (info.Angle.Length > 1 && info.Speed.Length > 1)
+			{
+				angle = new WAngle(world.SharedRandom.Next(info.Angle[0].Angle, info.Angle[1].Angle));
+				speed = new WRange(world.SharedRandom.Next(info.Speed[0].Range, info.Speed[1].Range));
+			}
+			else
+			{
+				angle = info.Angle[0];
+				speed = info.Speed[0];
+			}
+
+			target = args.PassiveTarget;
+			if (info.Inaccuracy.Range > 0)
+			{
+				var inaccuracy = OpenRA.Traits.Util.ApplyPercentageModifiers(info.Inaccuracy.Range, args.InaccuracyModifiers);
+				var maxOffset = inaccuracy * (target - pos).Length / args.Weapon.Range.Range;
+				target += WVec.FromPDF(world.SharedRandom, 2) * maxOffset / 1024;
+			}
+
+			facing = OpenRA.Traits.Util.GetFacing(target - pos, 0);
+			length = Math.Max((target - pos).Length / speed.Range, 1);
+
+			if (info.Image != null)
+			{
+				anim = new Animation(world, info.Image, GetEffectiveFacing);
+				anim.PlayRepeating("idle");
+			}
+
+			if (info.ContrailLength > 0)
+			{
+				var color = info.ContrailUsePlayerColor ? ContrailRenderable.ChooseColor(args.SourceActor) : info.ContrailColor;
+				trail = new ContrailRenderable(world, color, info.ContrailLength, info.ContrailDelay, 0);
+			}
+
+			smokeTicks = info.TrailDelay;
+		}
+
+		int GetEffectiveFacing()
+		{
+			var at = (float)ticks / (length - 1);
+			var attitude = angle.Tan() * (1 - 2 * at) / (4 * 1024);
+
+			var u = (facing % 128) / 128f;
+			var scale = 512 * u * (1 - u);
+
+			return (int)(facing < 128
+				? facing - scale * attitude
+				: facing + scale * attitude);
+		}
+
+		public void Tick(World world)
+		{
+			if (anim != null)
+				anim.Tick();
+
+			pos = WPos.LerpQuadratic(args.Source, target, angle, ticks, length);
+
+			if (info.Trail != null && --smokeTicks < 0)
+			{
+				var delayedPos = WPos.LerpQuadratic(args.Source, target, angle, ticks - info.TrailDelay, length);
+				world.AddFrameEndTask(w => w.Add(new Smoke(w, delayedPos, info.Trail)));
+				smokeTicks = info.TrailInterval;
+			}
+
+			if (info.ContrailLength > 0)
+				trail.Update(pos);
+
+			if (ticks++ >= length || (!info.High && world.ActorMap
+				.GetUnitsAt(world.Map.CellContaining(pos)).Any(a => a.HasTrait<IBlocksBullets>())))
+			{
+				Explode(world);
+			}
+		}
+
+		public IEnumerable<IRenderable> Render(WorldRenderer wr)
+		{
+			if (info.ContrailLength > 0)
+				yield return trail;
+
+			if (anim == null || ticks >= length)
+				yield break;
+
+			var cell = wr.world.Map.CellContaining(pos);
+			if (!args.SourceActor.World.FogObscures(cell))
+			{
+				if (info.Shadow)
+				{
+					var shadowPos = pos - new WVec(0, 0, pos.Z);
+					foreach (var r in anim.Render(shadowPos, wr.Palette("shadow")))
+						yield return r;
+				}
+
+				var palette = wr.Palette(args.Weapon.Palette);
+				foreach (var r in anim.Render(pos, palette))
+					yield return r;
+			}
+		}
+
+		void Explode(World world)
+		{
+			if (info.ContrailLength > 0)
+				world.AddFrameEndTask(w => w.Add(new ContrailFader(pos, trail)));
+
+			world.AddFrameEndTask(w => w.Remove(this));
+
+			args.Weapon.Impact(Target.FromPos(pos), args.SourceActor, args.DamageModifiers);
+		}
+	}
+}

OpenRA.Mods.Common/Effects/Contrail.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.Drawing;
+using OpenRA.Graphics;
+using OpenRA.Mods.Common.Graphics;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Effects
+{
+	[Desc("Draw a colored contrail behind this actor when they move.")]
+	class ContrailInfo : ITraitInfo, Requires<IBodyOrientationInfo>
+	{
+		[Desc("Position relative to body")]
+		public readonly WVec Offset = WVec.Zero;
+
+		[Desc("Measured in pixels.")]
+		public readonly int TrailLength = 25;
+
+		[Desc("RGB color of the contrail.")]
+		public readonly Color Color = Color.White;
+
+		[Desc("Use player remap color instead of a custom color?")]
+		public readonly bool UsePlayerColor = true;
+
+		public object Create(ActorInitializer init) { return new Contrail(init.self, this); }
+	}
+
+	class Contrail : ITick, IRender
+	{
+		ContrailInfo info;
+		ContrailRenderable trail;
+		IBodyOrientation body;
+
+		public Contrail(Actor self, ContrailInfo info)
+		{
+			this.info = info;
+
+			var color = info.UsePlayerColor ? ContrailRenderable.ChooseColor(self) : info.Color;
+			trail = new ContrailRenderable(self.World, color, info.TrailLength, 0, 0);
+
+			body = self.Trait<IBodyOrientation>();
+		}
+
+		public void Tick(Actor self)
+		{
+			var local = info.Offset.Rotate(body.QuantizeOrientation(self, self.Orientation));
+			trail.Update(self.CenterPosition + body.LocalToWorld(local));
+		}
+
+		public IEnumerable<IRenderable> Render(Actor self, WorldRenderer wr)
+		{
+			yield return trail;
+		}
+	}
+}

OpenRA.Mods.Common/Effects/Corpse.cs

@@ -0,0 +1,45 @@
+#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 OpenRA.Effects;
+using OpenRA.Graphics;
+
+namespace OpenRA.Mods.Common.Effects
+{
+	public class Corpse : IEffect
+	{
+		readonly World world;
+		readonly WPos pos;
+		readonly CPos cell;
+		readonly string paletteName;
+		readonly Animation anim;
+
+		public Corpse(World world, WPos pos, string image, string sequence, string paletteName)
+		{
+			this.world = world;
+			this.pos = pos;
+			this.cell = world.Map.CellContaining(pos);
+			this.paletteName = paletteName;
+			anim = new Animation(world, image);
+			anim.PlayThen(sequence, () => world.AddFrameEndTask(w => w.Remove(this)));
+		}
+
+		public void Tick(World world) { anim.Tick(); }
+
+		public IEnumerable<IRenderable> Render(WorldRenderer wr)
+		{
+			if (world.FogObscures(cell))
+				return SpriteRenderable.None;
+
+			return anim.Render(pos, wr.Palette(paletteName));
+		}
+	}
+}

OpenRA.Mods.Common/Effects/CrateEffect.cs

@@ -0,0 +1,45 @@
+#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 OpenRA.Effects;
+using OpenRA.Graphics;
+
+namespace OpenRA.Mods.Common.Effects
+{
+	public class CrateEffect : IEffect
+	{
+		readonly string palette;
+		readonly Actor a;
+		readonly Animation anim;
+
+		public CrateEffect(Actor a, string seq, string palette)
+		{
+			this.a = a;
+			this.palette = palette;
+
+			anim = new Animation(a.World, "crate-effects");
+			anim.PlayThen(seq, () => a.World.AddFrameEndTask(w => w.Remove(this)));
+		}
+
+		public void Tick(World world)
+		{
+			anim.Tick();
+		}
+
+		public IEnumerable<IRenderable> Render(WorldRenderer wr)
+		{
+			if (!a.IsInWorld || a.World.FogObscures(a.Location))
+				return SpriteRenderable.None;
+
+			return anim.Render(a.CenterPosition, wr.Palette(palette));
+		}
+	}
+}

OpenRA.Mods.Common/Effects/GravityBomb.cs

@@ -0,0 +1,84 @@
+#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 OpenRA.Effects;
+using OpenRA.GameRules;
+using OpenRA.Graphics;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Effects
+{
+	public class GravityBombInfo : IProjectileInfo
+	{
+		public readonly string Image = null;
+		public readonly bool Shadow = false;
+		public readonly WRange Velocity = WRange.Zero;
+		public readonly WRange Acceleration = new WRange(15);
+
+		public IEffect Create(ProjectileArgs args) { return new GravityBomb(this, args); }
+	}
+
+	public class GravityBomb : IEffect
+	{
+		GravityBombInfo info;
+		Animation anim;
+		ProjectileArgs args;
+		WVec velocity;
+		WPos pos;
+
+		public GravityBomb(GravityBombInfo info, ProjectileArgs args)
+		{
+			this.info = info;
+			this.args = args;
+			pos = args.Source;
+			velocity = new WVec(WRange.Zero, WRange.Zero, -info.Velocity);
+
+			anim = new Animation(args.SourceActor.World, info.Image);
+			if (anim.HasSequence("open"))
+				anim.PlayThen("open", () => anim.PlayRepeating("idle"));
+			else
+				anim.PlayRepeating("idle");
+		}
+
+		public void Tick(World world)
+		{
+			velocity -= new WVec(WRange.Zero, WRange.Zero, info.Acceleration);
+			pos += velocity;
+
+			if (pos.Z <= args.PassiveTarget.Z)
+			{
+				pos += new WVec(0, 0, args.PassiveTarget.Z - pos.Z);
+				world.AddFrameEndTask(w => w.Remove(this));
+				args.Weapon.Impact(Target.FromPos(pos), args.SourceActor, args.DamageModifiers);
+			}
+
+			anim.Tick();
+		}
+
+		public IEnumerable<IRenderable> Render(WorldRenderer wr)
+		{
+			var cell = wr.world.Map.CellContaining(pos);
+			if (!args.SourceActor.World.FogObscures(cell))
+			{
+				if (info.Shadow)
+				{
+					var shadowPos = pos - new WVec(0, 0, pos.Z);
+					foreach (var r in anim.Render(shadowPos, wr.Palette("shadow")))
+						yield return r;
+				}
+
+				var palette = wr.Palette(args.Weapon.Palette);
+				foreach (var r in anim.Render(pos, palette))
+					yield return r;
+			}
+		}
+	}
+}

OpenRA.Mods.Common/Effects/LaserZap.cs

@@ -0,0 +1,102 @@
+#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.Drawing;
+using OpenRA.Effects;
+using OpenRA.GameRules;
+using OpenRA.Graphics;
+using OpenRA.Mods.Common.Graphics;
+using OpenRA.Traits;
+
+
+namespace OpenRA.Mods.Common.Effects
+{
+	[Desc("Not a sprite, but an engine effect.")]
+	class LaserZapInfo : IProjectileInfo
+	{
+		public readonly int BeamWidth = 2;
+		public readonly int BeamDuration = 10;
+		public readonly bool UsePlayerColor = false;
+		[Desc("Laser color in (A,)R,G,B.")]
+		public readonly Color Color = Color.Red;
+		[Desc("Impact animation. Requires a regular animation with idle: sequence instead of explosion special case.")]
+		public readonly string HitAnim = null;
+		public readonly string HitAnimPalette = "effect";
+
+		public IEffect Create(ProjectileArgs args)
+		{
+			var c = UsePlayerColor ? args.SourceActor.Owner.Color.RGB : Color;
+			return new LaserZap(args, this, c);
+		}
+	}
+
+	class LaserZap : IEffect
+	{
+		ProjectileArgs args;
+		LaserZapInfo info;
+		int ticks = 0;
+		Color color;
+		bool doneDamage;
+		bool animationComplete;
+		Animation hitanim;
+		WPos target;
+
+		public LaserZap(ProjectileArgs args, LaserZapInfo info, Color color)
+		{
+			this.args = args;
+			this.info = info;
+			this.color = color;
+			this.target = args.PassiveTarget;
+
+			if (info.HitAnim != null)
+				this.hitanim = new Animation(args.SourceActor.World, info.HitAnim);
+		}
+
+		public void Tick(World world)
+		{
+			// Beam tracks target
+			if (args.GuidedTarget.IsValidFor(args.SourceActor))
+				target = args.GuidedTarget.CenterPosition;
+
+			if (!doneDamage)
+			{
+				if (hitanim != null)
+					hitanim.PlayThen("idle", () => animationComplete = true);
+
+				args.Weapon.Impact(Target.FromPos(target), args.SourceActor, args.DamageModifiers);
+				doneDamage = true;
+			}
+
+			if (hitanim != null)
+				hitanim.Tick();
+
+			if (++ticks >= info.BeamDuration && animationComplete)
+				world.AddFrameEndTask(w => w.Remove(this));
+		}
+
+		public IEnumerable<IRenderable> Render(WorldRenderer wr)
+		{
+			if (wr.world.FogObscures(wr.world.Map.CellContaining(target)) &&
+				wr.world.FogObscures(wr.world.Map.CellContaining(args.Source)))
+				yield break;
+
+			if (ticks < info.BeamDuration)
+			{
+				var rc = Color.FromArgb((info.BeamDuration - ticks) * 255 / info.BeamDuration, color);
+				yield return new BeamRenderable(args.Source, 0, target - args.Source, info.BeamWidth, rc);
+			}
+
+			if (hitanim != null)
+				foreach (var r in hitanim.Render(target, wr.Palette(info.HitAnimPalette)))
+					yield return r;
+		}
+	}
+}

OpenRA.Mods.Common/Effects/Missile.cs

@@ -0,0 +1,220 @@
+#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.Drawing;
+using System.Linq;
+using OpenRA.Effects;
+using OpenRA.GameRules;
+using OpenRA.Graphics;
+using OpenRA.Mods.Common.Graphics;
+using OpenRA.Mods.Common.Traits;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Effects
+{
+	class MissileInfo : IProjectileInfo
+	{
+		[Desc("Projectile speed in WRange / tick")]
+		public readonly WRange Speed = new WRange(8);
+		[Desc("Maximum vertical pitch when changing altitude.")]
+		public readonly WAngle MaximumPitch = WAngle.FromDegrees(30);
+		[Desc("How many ticks before this missile is armed and can explode.")]
+		public readonly int Arm = 0;
+		[Desc("Check for whether an actor with BlocksBullets: trait blocks fire")]
+		public readonly bool High = false;
+		public readonly bool Shadow = false;
+		public readonly string Trail = null;
+		[Desc("Maximum offset at the maximum range")]
+		public readonly WRange Inaccuracy = WRange.Zero;
+		[Desc("Probability of locking onto and following target.")]
+		public readonly int LockOnProbability = 100;
+		public readonly string Image = null;
+		[Desc("Rate of Turning")]
+		public readonly int ROT = 5;
+		[Desc("Explode when following the target longer than this.")]
+		public readonly int RangeLimit = 0;
+		[Desc("If fired at aircraft, increase speed by 50%.")]
+		public readonly bool TurboBoost = false;
+		public readonly int TrailInterval = 2;
+		public readonly int ContrailLength = 0;
+		public readonly Color ContrailColor = Color.White;
+		public readonly bool ContrailUsePlayerColor = false;
+		public readonly int ContrailDelay = 1;
+		public readonly bool Jammable = true;
+		[Desc("Explodes when leaving the following terrain type, e.g., Water for torpedoes.")]
+		public readonly string BoundToTerrainType = "";
+		[Desc("Explodes when inside this proximity radius to target.",
+			"Note: If this value is lower than the missile speed, this check might", 
+			"not trigger fast enough, causing the missile to fly past the target.")]
+		public readonly WRange CloseEnough = new WRange(298);
+
+		public IEffect Create(ProjectileArgs args) { return new Missile(this, args); }
+	}
+
+	class Missile : IEffect, ISync
+	{
+		readonly MissileInfo info;
+		readonly ProjectileArgs args;
+		readonly Animation anim;
+
+		int ticksToNextSmoke;
+		ContrailRenderable trail;
+
+		[Sync] WPos pos;
+		[Sync] int facing;
+
+		[Sync] WPos targetPosition;
+		[Sync] WVec offset;
+		[Sync] int ticks;
+
+		[Sync] bool lockOn = false;
+
+		[Sync] public Actor SourceActor { get { return args.SourceActor; } }
+		[Sync] public Target GuidedTarget { get { return args.GuidedTarget; } }
+
+		public Missile(MissileInfo info, ProjectileArgs args)
+		{
+			this.info = info;
+			this.args = args;
+
+			pos = args.Source;
+			facing = args.Facing;
+
+			targetPosition = args.PassiveTarget;
+
+			var world = args.SourceActor.World;
+
+			if (world.SharedRandom.Next(100) <= info.LockOnProbability)
+				lockOn = true;
+
+			if (info.Inaccuracy.Range > 0)
+			{
+				var inaccuracy = OpenRA.Traits.Util.ApplyPercentageModifiers(info.Inaccuracy.Range, args.InaccuracyModifiers);
+				offset = WVec.FromPDF(world.SharedRandom, 2) * inaccuracy / 1024;
+			}
+
+			if (info.Image != null)
+			{
+				anim = new Animation(world, info.Image, () => facing);
+				anim.PlayRepeating("idle");
+			}
+
+			if (info.ContrailLength > 0)
+			{
+				var color = info.ContrailUsePlayerColor ? ContrailRenderable.ChooseColor(args.SourceActor) : info.ContrailColor;
+				trail = new ContrailRenderable(world, color, info.ContrailLength, info.ContrailDelay, 0);
+			}
+		}
+
+		bool JammedBy(TraitPair<JamsMissiles> tp)
+		{
+			if ((tp.Actor.CenterPosition - pos).HorizontalLengthSquared > tp.Trait.Range * tp.Trait.Range)
+				return false;
+
+			if (tp.Actor.Owner.Stances[args.SourceActor.Owner] == Stance.Ally && !tp.Trait.AlliedMissiles)
+				return false;
+
+			return tp.Actor.World.SharedRandom.Next(100 / tp.Trait.Chance) == 0;
+		}
+
+		public void Tick(World world)
+		{
+			ticks++;
+			anim.Tick();
+
+			// Missile tracks target
+			if (args.GuidedTarget.IsValidFor(args.SourceActor) && lockOn)
+				targetPosition = args.GuidedTarget.CenterPosition;
+
+			var dist = targetPosition + offset - pos;
+			var desiredFacing = OpenRA.Traits.Util.GetFacing(dist, facing);
+			var desiredAltitude = targetPosition.Z;
+			var jammed = info.Jammable && world.ActorsWithTrait<JamsMissiles>().Any(JammedBy);
+
+			if (jammed)
+			{
+				desiredFacing = facing + world.SharedRandom.Next(-20, 21);
+				desiredAltitude = world.SharedRandom.Next(-43, 86);
+			}
+			else if (!args.GuidedTarget.IsValidFor(args.SourceActor))
+				desiredFacing = facing;
+
+			facing = OpenRA.Traits.Util.TickFacing(facing, desiredFacing, info.ROT);
+			var move = new WVec(0, -1024, 0).Rotate(WRot.FromFacing(facing)) * info.Speed.Range / 1024;
+			if (targetPosition.Z > 0 && info.TurboBoost)
+				move = (move * 3) / 2;
+
+			if (pos.Z != desiredAltitude)
+			{
+				var delta = move.HorizontalLength * info.MaximumPitch.Tan() / 1024;
+				var dz = (targetPosition.Z - pos.Z).Clamp(-delta, delta);
+				move += new WVec(0, 0, dz);
+			}
+
+			pos += move;
+
+			if (info.Trail != null && --ticksToNextSmoke < 0)
+			{
+				world.AddFrameEndTask(w => w.Add(new Smoke(w, pos - 3 * move / 2, info.Trail)));
+				ticksToNextSmoke = info.TrailInterval;
+			}
+
+			if (info.ContrailLength > 0)
+				trail.Update(pos);
+
+			var cell = world.Map.CellContaining(pos);
+
+			var shouldExplode = (pos.Z < 0) // Hit the ground
+				|| (dist.LengthSquared < info.CloseEnough.Range * info.CloseEnough.Range) // Within range
+				|| (info.RangeLimit != 0 && ticks > info.RangeLimit) // Ran out of fuel
+				|| (!info.High && world.ActorMap.GetUnitsAt(cell).Any(a => a.HasTrait<IBlocksBullets>())) // Hit a wall
+				|| !world.Map.Contains(cell) // This also avoids an IndexOutOfRangeException in GetTerrainInfo below.
+				|| (!string.IsNullOrEmpty(info.BoundToTerrainType) && world.Map.GetTerrainInfo(cell).Type != info.BoundToTerrainType); // Hit incompatible terrain
+
+			if (shouldExplode)
+				Explode(world);
+		}
+
+		void Explode(World world)
+		{
+			if (info.ContrailLength > 0)
+				world.AddFrameEndTask(w => w.Add(new ContrailFader(pos, trail)));
+
+			world.AddFrameEndTask(w => w.Remove(this));
+
+			// Don't blow up in our launcher's face!
+			if (ticks <= info.Arm)
+				return;
+
+			args.Weapon.Impact(Target.FromPos(pos), args.SourceActor, args.DamageModifiers);
+		}
+
+		public IEnumerable<IRenderable> Render(WorldRenderer wr)
+		{
+			if (info.ContrailLength > 0)
+				yield return trail;
+
+			if (!args.SourceActor.World.FogObscures(wr.world.Map.CellContaining(pos)))
+			{
+				if (info.Shadow)
+				{
+					var shadowPos = new WPos(pos.X, pos.Y, 0);
+					foreach (var r in anim.Render(shadowPos, wr.Palette("shadow")))
+						yield return r;
+				}
+
+				var palette = wr.Palette(args.Weapon.Palette);
+				foreach (var r in anim.Render(pos, palette))
+					yield return r;
+			}
+		}
+	}
+}

OpenRA.Mods.Common/Effects/RallyPoint.cs

@@ -0,0 +1,68 @@
+#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.Common.Effects
+{
+	class RallyPoint : IEffect
+	{
+		readonly Actor building;
+		readonly Common.RallyPoint rp;
+		readonly string palettePrefix;
+		readonly Animation flag;
+		readonly Animation circles;
+
+		public RallyPoint(Actor building, string palettePrefix)
+		{
+			this.building = building;
+			this.palettePrefix = palettePrefix;
+
+			rp = building.Trait<Common.RallyPoint>();
+
+			flag = new Animation(building.World, "rallypoint");
+			circles = new Animation(building.World, "rallypoint");
+
+			flag.PlayRepeating("flag");
+			circles.Play("circles");
+		}
+
+		CPos cachedLocation;
+		public void Tick(World world)
+		{
+			flag.Tick();
+			circles.Tick();
+			if (cachedLocation != rp.Location)
+			{
+				cachedLocation = rp.Location;
+				circles.Play("circles");
+			}
+
+			if (!building.IsInWorld || building.IsDead())
+				world.AddFrameEndTask(w => w.Remove(this));
+		}
+
+		public IEnumerable<IRenderable> Render(WorldRenderer wr)
+		{
+			if (building.Owner != building.World.LocalPlayer)
+				return SpriteRenderable.None;
+
+			if (!building.IsInWorld || !building.World.Selection.Actors.Contains(building))
+				return SpriteRenderable.None;
+
+			var pos = wr.world.Map.CenterOfCell(cachedLocation);
+			var palette = wr.Palette(palettePrefix+building.Owner.InternalName);
+			return circles.Render(pos, palette).Concat(flag.Render(pos, palette));
+		}
+	}
+}