Add missile jamming to MRJ

OpenRA.Mods.RA/Effects/Missile.cs

@@ -41,8 +41,9 @@ namespace OpenRA.Mods.RA.Effects
 		public readonly Color ContrailColor = Color.White;
 		public readonly bool ContrailUsePlayerColor = false;
 		public readonly int ContrailDelay = 1;
+		public readonly bool Jammable = true;
 
-		public IEffect Create(ProjectileArgs args) { return new Missile( this, args ); }
+		public IEffect Create(ProjectileArgs args) { return new Missile(this, args); }
 	}
 
 	class Missile : IEffect
@@ -90,27 +91,44 @@ namespace OpenRA.Mods.RA.Effects
 		const int MissileCloseEnough = 7;
 		int ticksToNextSmoke;
 
-		public void Tick( World world )
+		public void Tick(World world)
 		{
 			t += 40;
 
 			// In pixels
 			var dist = Args.target.CenterLocation + offset - PxPosition;
 
-			var targetAltitude = 0;
+			var targetAltitude = 0; 
 			if (Args.target.IsValid && Args.target.IsActor && Args.target.Actor.HasTrait<IMove>())
-				targetAltitude =  Args.target.Actor.Trait<IMove>().Altitude;
+				targetAltitude = Args.target.Actor.Trait<IMove>().Altitude;
 
-			Altitude += Math.Sign(targetAltitude - Altitude);
+			var jammed = Info.Jammable && world.ActorsWithTrait<JamsMissiles>().Any(tp =>
+				(tp.Actor.CenterLocation - PxPosition).ToCVec().Length <= tp.Trait.Range
 
-			if (Args.target.IsValid)
+				&& (tp.Actor.Owner.Stances[Args.firedBy.Owner] != Stance.Ally
+				|| (tp.Actor.Owner.Stances[Args.firedBy.Owner] == Stance.Ally && tp.Trait.AlliedMissiles))
+
+				&& world.SharedRandom.Next(100 / tp.Trait.Chance) == 0);
+
+			if (!jammed)
+			{
+				Altitude += Math.Sign(targetAltitude - Altitude);
+				if (Args.target.IsValid)
+					Facing = Traits.Util.TickFacing(Facing,
+						Traits.Util.GetFacing(dist, Facing),
+						Info.ROT);
+			}
+			else
+			{
+				Altitude += world.SharedRandom.Next(-1, 2);
 				Facing = Traits.Util.TickFacing(Facing,
-					Traits.Util.GetFacing(dist, Facing),
+					Facing + world.SharedRandom.Next(-20, 21),
 					Info.ROT);
+			}
 
 			anim.Tick();
 
-			if (dist.LengthSquared < MissileCloseEnough * MissileCloseEnough && Args.target.IsValid )
+			if (dist.LengthSquared < MissileCloseEnough * MissileCloseEnough && Args.target.IsValid)
 				Explode(world);
 
 			// TODO: Replace this with a lookup table

OpenRA.Mods.RA/JamsMissiles.cs

@@ -0,0 +1,32 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2013 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 OpenRA;
+using OpenRA.Traits;
+
+class JamsMissilesInfo : ITraitInfo
+{
+	public readonly int Range = 0;
+	public readonly bool AlliedMissiles = true;
+	public readonly int Chance = 100;
+
+	public object Create(ActorInitializer init) { return new JamsMissiles(this); }
+}
+
+class JamsMissiles
+{
+	readonly JamsMissilesInfo info;
+
+	public int Range { get { return info.Range; } }
+	public bool AlliedMissiles { get { return info.AlliedMissiles; } }
+	public int Chance { get { return info.Chance; } }
+
+	public JamsMissiles(JamsMissilesInfo info) { this.info = info; }
+}

OpenRA.Mods.RA/OpenRA.Mods.RA.csproj

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
@@ -233,6 +233,7 @@
     <Compile Include="InfiltrateForSupportPower.cs" />
     <Compile Include="Invulnerable.cs" />
     <Compile Include="IronCurtainable.cs" />
+    <Compile Include="JamsMissiles.cs" />
     <Compile Include="LeavesHusk.cs" />
     <Compile Include="LightPaletteRotator.cs" />
     <Compile Include="LimitedAmmo.cs" />

mods/ra/rules/vehicles.yaml

@@ -490,7 +490,7 @@ MGG:
 	Inherits: ^Vehicle
 	Buildable:
 		Queue: Vehicle
-		BuildPaletteOrder: 150
+		BuildPaletteOrder: 160
 		Prerequisites: atek
 		Owner: allies
 		Hotkey: y
@@ -537,11 +537,13 @@ MRJ:
 		Cost: 1000
 	Tooltip:
 		Name: Mobile Radar Jammer
-		Description: Jams nearby enemy radar domes.
+		Description: Jams enemy radar and deflects missiles.\n  Unarmed
 	Buildable:
 		Queue: Vehicle
-		BuildPaletteOrder: 1000
-		Owner: None
+		BuildPaletteOrder: 150
+		Prerequisites: atek
+		Owner: allies
+		Hotkey: m
 	Health:
 		HP: 200
 	Armor:
@@ -560,6 +562,8 @@ MRJ:
 		EmptyWeapon: UnitExplodeSmall
 	JamsRadar:
 		Range: 15
+	JamsMissiles:
+		Range: 3
 
 1TNK.Husk:
 	Inherits: ^Husk