Everything is now OpenRA, not OpenRa

OpenRA.Game/Effects/Bullet.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.Collections.Generic;
+using OpenRA.GameRules;
+using OpenRA.Graphics;
+using OpenRA.Traits;
+
+namespace OpenRA.Effects
+{
+	public 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;
+		readonly int SrcAltitude;
+		readonly int DestAltitude;
+
+		int t = 0;
+		Animation anim;
+
+		const int BaseBulletSpeed = 100;		/* pixels / 40ms frame */
+
+		public Bullet(string weapon, Player owner, Actor firedBy,
+			int2 src, int2 dest, int srcAltitude, int destAltitude)
+			: this(Rules.WeaponInfo[weapon], owner, firedBy, src, dest, srcAltitude, destAltitude) { }
+
+		/* src, dest are *pixel* coords */
+		public Bullet(WeaponInfo weapon, Player owner, Actor firedBy, 
+			int2 src, int2 dest, int srcAltitude, int destAltitude)
+		{
+			Owner = owner;
+			FiredBy = firedBy;
+			Src = src;
+			Dest = dest;
+			SrcAltitude = srcAltitude;
+			DestAltitude = destAltitude;
+			VisualDest = Dest + new int2(
+						firedBy.World.CosmeticRandom.Next(-10, 10),
+						firedBy.World.CosmeticRandom.Next(-10, 10));
+			Weapon = weapon;
+			Projectile = Rules.ProjectileInfo[Weapon.Projectile];
+			Warhead = Rules.WarheadInfo[Weapon.Warhead];
+
+			if (Projectile.Image != null && Projectile.Image != "none")
+			{
+				if (Projectile.Rotates)
+					anim = new Animation(Projectile.Image, () => Traits.Util.GetFacing((dest - src).ToFloat2(), 0));
+				else
+					anim = new Animation(Projectile.Image);
+
+				anim.PlayRepeating("idle");
+			}
+		}
+
+		int TotalTime() { return (Dest - Src).Length * BaseBulletSpeed / Weapon.Speed; }
+
+		public void Tick( World world )
+		{
+			t += 40;
+
+			if (t > TotalTime())		/* remove finished bullets */
+			{
+				world.AddFrameEndTask(w => w.Remove(this));
+				Combat.DoImpact(Dest, VisualDest - new int2( 0, DestAltitude ), 
+					Weapon, Projectile, Warhead, FiredBy);
+			}
+
+			if (Projectile.Trail != null)
+			{
+				var at = (float)t / TotalTime();
+				var altitude = float2.Lerp(SrcAltitude, DestAltitude, at);
+				var pos = float2.Lerp(Src.ToFloat2(), VisualDest.ToFloat2(), at)
+					- 0.5f * anim.Image.size - new float2(0, altitude);
+
+				var highPos = (Projectile.High || Projectile.Arcing)
+					? (pos - new float2(0, (VisualDest - Src).Length * height * 4 * at * (1 - at)))
+					: pos;
+
+				world.AddFrameEndTask(w => w.Add(
+					new Smoke(w, highPos.ToInt2(), Projectile.Trail)));
+			}
+		}
+
+		const float height = .1f;
+
+		public IEnumerable<Renderable> Render()
+		{
+			if (anim != null)
+			{
+				var at = (float)t / TotalTime();
+
+				var altitude = float2.Lerp(SrcAltitude, DestAltitude, at);
+				var pos = float2.Lerp( Src.ToFloat2(), VisualDest.ToFloat2(), at)
+					- 0.5f * anim.Image.size - new float2( 0, altitude );
+
+				if (Projectile.High || Projectile.Arcing)
+				{
+					if (Projectile.Shadow)
+						yield return new Renderable(anim.Image, pos - .5f * anim.Image.size, "shadow");
+
+					var highPos = pos - new float2(0, (VisualDest - Src).Length * height * 4 * at * (1 - at));
+
+					yield return new Renderable(anim.Image, highPos - .5f * anim.Image.size, Owner.Palette);
+				}
+				else
+					yield return new Renderable(anim.Image, pos - .5f * anim.Image.size, Projectile.UnderWater ? "shadow" : Owner.Palette);
+			}
+		}
+	}
+}