bullet test

OpenRa.DataStructures/int2.cs

@@ -23,6 +23,7 @@ namespace OpenRa
 
 		public int2 Sign() { return new int2(Math.Sign(X), Math.Sign(Y)); }
 		public int2 Abs() { return new int2( Math.Abs( X ), Math.Abs( Y ) ); }
+		public int Length { get { return (int)Math.Sqrt(X * X + Y * Y); } }
 		public override int GetHashCode() { return X.GetHashCode() ^ Y.GetHashCode(); }
 
 		public override bool Equals(object obj)

OpenRa.Game/Bullet.cs

@@ -18,9 +18,14 @@ namespace OpenRa.Game
 		readonly int2 Src;
 		readonly int2 Dest;
 
+		int t = 0;
+		Animation anim;
+
+		const int BaseBulletSpeed = 100;		/* pixels / ms */
+
 		/* src, dest are *pixel* coords */
 		public Bullet(string weapon, Player owner, Actor firedBy, 
-			int2 src, int2 dest)
+			int2 src, int2 dest, Game game)
 		{
 			Owner = owner;
 			FiredBy = firedBy;
@@ -29,9 +34,30 @@ namespace OpenRa.Game
 			Weapon = Rules.WeaponInfo[weapon];
 			Projectile = Rules.ProjectileInfo[Weapon.Projectile];
 			Warhead = Rules.WarheadInfo[Weapon.Warhead];
+
+			anim = new Animation(Projectile.Image);
+			anim.PlayRepeating("idle");
 		}
 
-		public void Tick(Game game, int dt) { /* todo */ }
-		public IEnumerable<Pair<Sprite, float2>> Render() { yield break; }
+		int TotalTime() { return (Dest - Src).Length * BaseBulletSpeed / Weapon.Speed; }
+
+		public void Tick(Game game, int dt)
+		{
+			if (t == 0)
+				game.PlaySound(Weapon.Report + ".aud", false);
+
+			t += dt;
+			if (t > TotalTime())
+				t = 0;	/* temporary! loop the bullet forever */
+		}
+
+		public IEnumerable<Pair<Sprite, float2>> Render()
+		{
+			yield return Pair.New(anim.Image,
+				float2.Lerp(
+					Src.ToFloat2(), 
+					Dest.ToFloat2(), 
+					(float)t / TotalTime()));
+		}
 	}
 }

OpenRa.Game/MainWindow.cs

@@ -60,6 +60,9 @@ using System.Runtime.InteropServices;
 			game.world.Add( new Actor( "mcv", new int2( 9, 5 ), game.players[ 0 ] ) );
 			game.world.Add( new Actor( "jeep", new int2( 9, 7 ), game.players[ 1 ] ) );
 
+			game.world.Add(new Bullet("105mm", game.players[1], null,
+				new int2(200, 200), new int2(400, 200), game));
+
 			sidebar = new Sidebar(renderer, game);
 
 			renderer.BuildPalette(game.map);

sequences.xml

@@ -331,4 +331,8 @@
 		<sequence name="repair" start="35" length="24" />
 	</cursor>
 
+	<unit name="120mm">
+		<sequence name="idle" start="0" length="1" />
+	</unit>
+	
 </sequences>