homing weapons more or less work now

OpenRa.Game/Effects/Bullet.cs

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+using System;
+using System.Collections.Generic;
+using OpenRa.Game.GameRules;
+using OpenRa.Game.Graphics;
+
+namespace OpenRa.Game.Effects
+{
+	class Bullet : IEffect
+	{
+		readonly Player Owner;
+		readonly Actor FiredBy;
+		readonly WeaponInfo Weapon;
+		readonly ProjectileInfo Projectile;
+		readonly WarheadInfo Warhead;
+		readonly int2 Src;
+		readonly int2 Dest;
+		readonly int2 VisualDest;
+
+		int t = 0;
+		Animation anim;
+
+		const int BaseBulletSpeed = 100;		/* pixels / 40ms frame */
+
+		/* src, dest are *pixel* coords */
+		public Bullet(string weapon, Player owner, Actor firedBy, 
+			int2 src, int2 dest)
+		{
+			Owner = owner;
+			FiredBy = firedBy;
+			Src = src;
+			Dest = dest;
+			VisualDest = Dest + new int2(
+						Game.CosmeticRandom.Next(-10, 10),
+						Game.CosmeticRandom.Next(-10, 10));
+			Weapon = Rules.WeaponInfo[weapon];
+			Projectile = Rules.ProjectileInfo[Weapon.Projectile];
+			Warhead = Rules.WarheadInfo[Weapon.Warhead];
+
+			if (Projectile.Image != null && Projectile.Image != "none")
+			{
+				anim = new Animation(Projectile.Image);
+				if (Projectile.Rotates)
+					Traits.Util.PlayFacing(anim, "idle", () => Traits.Util.GetFacing((dest - src).ToFloat2(), 0));
+				else
+					anim.PlayRepeating("idle");
+			}
+		}
+
+		int TotalTime() { return (Dest - Src).Length * BaseBulletSpeed / Weapon.Speed; }
+
+		public void Tick()
+		{
+			if (t == 0)
+				Sound.Play(Weapon.Report + ".aud");
+
+			t += 40;
+
+			if (t > TotalTime())		/* remove finished bullets */
+			{
+				Game.world.AddFrameEndTask(w => w.Remove(this));
+				Combat.DoImpact(Dest, VisualDest, Weapon, Projectile, Warhead, FiredBy);
+			}
+		}
+
+		const float height = .1f;
+
+		public IEnumerable<Tuple<Sprite, float2, int>> Render()
+		{
+			if (anim != null)
+			{
+				var pos = float2.Lerp(
+						Src.ToFloat2(),
+						VisualDest.ToFloat2(),
+						(float)t / TotalTime()) - 0.5f * anim.Image.size;
+
+				if (Projectile.High || Projectile.Arcing)
+				{
+					if (Projectile.Shadow)
+						yield return Tuple.New(anim.Image, pos, 8);
+
+					var at = (float)t / TotalTime();
+					var highPos = pos - new float2(0, (VisualDest - Src).Length * height * 4 * at * (1 - at));
+
+					yield return Tuple.New(anim.Image, highPos, Owner.Palette);
+				}
+				else
+					yield return Tuple.New(anim.Image, pos, Owner.Palette);
+			}
+		}
+	}
+}

OpenRa.Game/Effects/Explosion.cs

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+using System.Collections.Generic;
+using OpenRa.Game.Graphics;
+
+namespace OpenRa.Game.Effects
+{
+	class Explosion : IEffect
+	{
+		Animation anim;
+		int2 pos;
+
+		public Explosion(int2 pixelPos, int style, bool isWater)
+		{
+			this.pos = pixelPos;
+			var variantSuffix = isWater ? "w" : "";
+			anim = new Animation("explosion");
+				anim.PlayThen(style.ToString() + variantSuffix, 
+					() => Game.world.AddFrameEndTask(w => w.Remove(this)));
+		}
+
+		public void Tick() { anim.Tick(); }
+
+		public IEnumerable<Tuple<Sprite, float2, int>> Render()
+		{
+			yield return Tuple.New(anim.Image, pos.ToFloat2() - 0.5f * anim.Image.size, 0);
+		}
+
+		public Player Owner { get { return null; } }
+	}
+}

OpenRa.Game/Effects/IEffect.cs

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+using System.Collections.Generic;
+using OpenRa.Game.Graphics;
+
+namespace OpenRa.Game.Effects
+{
+	interface IEffect
+	{
+		void Tick();
+		IEnumerable<Tuple<Sprite, float2, int>> Render();
+	}
+}

OpenRa.Game/Effects/Missile.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using OpenRa.Game.Graphics;
+using OpenRa.Game.GameRules;
+
+namespace OpenRa.Game.Effects
+{
+	class Missile : IEffect
+	{
+		readonly Player Owner;
+		readonly Actor FiredBy;
+		readonly WeaponInfo Weapon;
+		readonly ProjectileInfo Projectile;
+		readonly WarheadInfo Warhead;
+		float2 Pos;
+		readonly Actor Target;
+		readonly Animation anim;
+		int Facing;
+		int t;
+
+		public Missile(string weapon, Player owner, Actor firedBy,
+			int2 src, Actor target)
+		{
+			Weapon = Rules.WeaponInfo[weapon];
+			Projectile = Rules.ProjectileInfo[Weapon.Projectile];
+			Warhead = Rules.WarheadInfo[Weapon.Warhead];
+			FiredBy = firedBy;
+			Owner = owner;
+			Target = target;
+			Pos = src.ToFloat2();
+
+			/* todo: initial facing should be turret facing, or unit facing if we're not turreted */
+			Facing = Traits.Util.GetFacing( Target.CenterLocation - src.ToFloat2(), 0 );
+
+			if (Projectile.Image != null && Projectile.Image != "none")
+			{
+				anim = new Animation(Projectile.Image);
+
+				if (Projectile.Rotates)
+					Traits.Util.PlayFacing(anim, "idle", () => Facing);
+				else
+					anim.PlayRepeating("idle");
+			}
+		}
+
+		const int MissileCloseEnough = 7;
+		const float Scale = .3f;
+
+		public void Tick()
+		{
+			if (t == 0)
+				Sound.Play(Weapon.Report + ".aud");
+
+			t += 40;
+
+			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)
+			{
+				Game.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;
+			}
+
+			var move = (Scale * Weapon.Speed / dist.Length) * dist;
+			Pos += move;
+
+			if (Projectile.Animates)
+				Game.world.AddFrameEndTask(w => w.Add(new Smoke((Pos - 1.5f * move).ToInt2())));
+
+			// todo: running out of fuel
+			// todo: turbo boost vs aircraft
+		}
+
+		public IEnumerable<Tuple<Sprite, float2, int>> Render()
+		{
+			yield return Tuple.New(anim.Image, Pos - 0.5f * anim.Image.size, 0);
+		}
+	}
+}

OpenRa.Game/Effects/Smoke.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using OpenRa.Game.Graphics;
+
+namespace OpenRa.Game.Effects
+{
+	class Smoke : IEffect
+	{
+		readonly int2 pos;
+		readonly Animation anim = new Animation("smokey");
+
+		public Smoke(int2 pos)
+		{
+			this.pos = pos;
+			anim.PlayThen("idle",
+				() => Game.world.AddFrameEndTask(
+					w => w.Remove(this)));
+		}
+
+		public void Tick()
+		{
+			anim.Tick();
+		}
+
+		public IEnumerable<Tuple<Sprite, float2, int>> Render()
+		{
+			yield return Tuple.New(anim.Image, pos.ToFloat2() - .5f * anim.Image.size, 0);
+		}
+	}
+}