Initial commit: OpenRA game engine

Fork from OpenRA/OpenRA with one-click launch script (start-ra.cmd)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

OpenRA.Mods.Common/Projectiles/GravityBomb.cs

@@ -0,0 +1,146 @@
+#region Copyright & License Information
+/*
+ * Copyright (c) The OpenRA Developers and Contributors
+ * 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, either version 3 of
+ * the License, or (at your option) any later version. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using System.Collections.Generic;
+using System.Collections.Immutable;
+using OpenRA.GameRules;
+using OpenRA.Graphics;
+using OpenRA.Primitives;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Projectiles
+{
+	[Desc("Projectile with customisable acceleration vector.")]
+	public class GravityBombInfo : IProjectileInfo
+	{
+		public readonly string Image = null;
+
+		[SequenceReference(nameof(Image), allowNullImage: true)]
+		[Desc("Loop a randomly chosen sequence of Image from this list while falling.")]
+		public readonly ImmutableArray<string> Sequences = ["idle"];
+
+		[SequenceReference(nameof(Image), allowNullImage: true)]
+		[Desc("Sequence to play when launched. Skipped if null or empty.")]
+		public readonly string OpenSequence = null;
+
+		[PaletteReference]
+		[Desc("The palette used to draw this projectile.")]
+		public readonly string Palette = "effect";
+
+		[Desc("Palette is a player palette BaseName")]
+		public readonly bool IsPlayerPalette = false;
+
+		[Desc("Does this projectile have a shadow?")]
+		public readonly bool Shadow = false;
+
+		[Desc("Color to draw shadow if Shadow is true.")]
+		public readonly Color ShadowColor = Color.FromArgb(140, 0, 0, 0);
+
+		[Desc("Projectile movement vector per tick (forward, right, up), use negative values for opposite directions.")]
+		public readonly WVec Velocity = WVec.Zero;
+
+		[Desc("Value added to Velocity every tick.")]
+		public readonly WVec Acceleration = new(0, 0, -15);
+
+		public IProjectile Create(ProjectileArgs args) { return new GravityBomb(this, args); }
+	}
+
+	public class GravityBomb : IProjectile, ISync
+	{
+		readonly GravityBombInfo info;
+		readonly Animation anim;
+		readonly ProjectileArgs args;
+		readonly WVec acceleration;
+
+		readonly float3 shadowColor;
+		readonly float shadowAlpha;
+
+		WVec velocity;
+
+		[VerifySync]
+		WPos pos, lastPos;
+
+		public GravityBomb(GravityBombInfo info, ProjectileArgs args)
+		{
+			this.info = info;
+			this.args = args;
+			pos = args.Source;
+			var convertedVelocity = new WVec(info.Velocity.Y, -info.Velocity.X, info.Velocity.Z);
+			velocity = convertedVelocity.Rotate(WRot.FromYaw(args.Facing));
+			acceleration = new WVec(info.Acceleration.Y, -info.Acceleration.X, info.Acceleration.Z);
+
+			if (!string.IsNullOrEmpty(info.Image))
+			{
+				anim = new Animation(args.SourceActor.World, info.Image, () => args.Facing);
+
+				if (!string.IsNullOrEmpty(info.OpenSequence))
+					anim.PlayThen(info.OpenSequence, () => anim.PlayRepeating(info.Sequences.Random(args.SourceActor.World.SharedRandom)));
+				else
+					anim.PlayRepeating(info.Sequences.Random(args.SourceActor.World.SharedRandom));
+			}
+
+			shadowColor = new float3(info.ShadowColor.R, info.ShadowColor.G, info.ShadowColor.B) / 255f;
+			shadowAlpha = info.ShadowColor.A / 255f;
+		}
+
+		public void Tick(World world)
+		{
+			lastPos = pos;
+			pos += velocity;
+			velocity += acceleration;
+
+			if (pos.Z <= args.PassiveTarget.Z)
+			{
+				pos += new WVec(0, 0, args.PassiveTarget.Z - pos.Z);
+				world.AddFrameEndTask(w => w.Remove(this));
+
+				var warheadArgs = new WarheadArgs(args)
+				{
+					ImpactOrientation = new WRot(WAngle.Zero, Util.GetVerticalAngle(lastPos, pos), args.Facing),
+					ImpactPosition = pos,
+				};
+
+				args.Weapon.Impact(Target.FromPos(pos), warheadArgs);
+			}
+
+			anim?.Tick();
+		}
+
+		public IEnumerable<IRenderable> Render(WorldRenderer wr)
+		{
+			if (anim == null)
+				yield break;
+
+			var world = args.SourceActor.World;
+			if (!world.FogObscures(pos))
+			{
+				var paletteName = info.Palette;
+				if (paletteName != null && info.IsPlayerPalette)
+					paletteName += args.SourceActor.Owner.InternalName;
+
+				var palette = wr.Palette(paletteName);
+
+				if (info.Shadow)
+				{
+					var dat = world.Map.DistanceAboveTerrain(pos);
+					var shadowPos = pos - new WVec(0, 0, dat.Length);
+					foreach (var r in anim.Render(shadowPos, palette))
+						yield return ((IModifyableRenderable)r)
+							.WithTint(shadowColor, ((IModifyableRenderable)r).TintModifiers | TintModifiers.ReplaceColor)
+							.WithAlpha(shadowAlpha);
+				}
+
+				foreach (var r in anim.Render(pos, palette))
+					yield return r;
+			}
+		}
+	}
+}