Initial support for individual unit upgrade crates

OpenRA.Mods.RA/GainsUnitUpgrades.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 OpenRA.Traits;
+using OpenRA.GameRules;
+
+namespace OpenRA.Mods.RA
+{
+	public class GainsUnitUpgradesInfo : ITraitInfo
+	{
+		public readonly int FirepowerMaxLevel = 15;
+		public readonly float FirepowerModifier = .2f;
+		public readonly int ArmorMaxLevel = 15;
+		public readonly float ArmorModifier = .2f;
+		public readonly int SpeedMaxLevel = 15;
+		public readonly decimal SpeedModifier = .2m;
+		// TODO: weapon range, rate of fire modifiers. potentially a vision modifier.
+
+		public object Create(ActorInitializer init) { return new GainsUnitUpgrades(this); }
+	}
+
+	public class GainsUnitUpgrades : IFirepowerModifier, IDamageModifier, ISpeedModifier
+	{
+		GainsUnitUpgradesInfo info;
+		[Sync] public int FirepowerLevel = 0;
+		[Sync] public int SpeedLevel = 0;
+		[Sync] public int ArmorLevel = 0;
+
+		public GainsUnitUpgrades(GainsUnitUpgradesInfo info)
+		{
+			this.info = info;
+		}
+
+		public bool CanGainUnitUpgrade(UnitUpgrade? upgrade)
+		{
+			if (upgrade == UnitUpgrade.Firepower)
+				return FirepowerLevel < info.FirepowerMaxLevel;
+			if (upgrade == UnitUpgrade.Armor)
+				return ArmorLevel < info.ArmorMaxLevel;
+			if (upgrade == UnitUpgrade.Speed)
+				return SpeedLevel < info.SpeedMaxLevel;
+
+			return false;
+		}
+
+		public void GiveUnitUpgrade(UnitUpgrade? upgrade, int numLevels)
+		{
+			if (upgrade == UnitUpgrade.Firepower)
+				FirepowerLevel = Math.Min(FirepowerLevel + numLevels, info.FirepowerMaxLevel);
+			else if (upgrade == UnitUpgrade.Armor)
+				ArmorLevel = Math.Min(ArmorLevel + numLevels, info.ArmorMaxLevel);
+			else if (upgrade == UnitUpgrade.Speed)
+				SpeedLevel = Math.Min(SpeedLevel + numLevels, info.SpeedMaxLevel);
+		}
+
+		public float GetFirepowerModifier()
+		{
+			return FirepowerLevel > 0 ? (1 + FirepowerLevel * info.FirepowerModifier) : 1;
+		}
+
+		public float GetDamageModifier(Actor attacker, WarheadInfo warhead)
+		{
+			return ArmorLevel > 0 ? (1 / (1 + ArmorLevel * info.ArmorModifier)) : 1;
+		}
+
+		public decimal GetSpeedModifier()
+		{
+			return SpeedLevel > 0 ? (1m + SpeedLevel * info.SpeedModifier) : 1m;
+		}
+	}
+
+	public enum UnitUpgrade
+	{
+		Firepower = 0,
+		Armor = 1,
+		Speed = 2
+	}
+}