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.D2k/Traits/Buildings/D2kActorPreviewPlaceBuildingPreview.cs

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+#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.Frozen;
+using System.Collections.Generic;
+using System.Collections.Immutable;
+using System.Linq;
+using OpenRA.Graphics;
+using OpenRA.Mods.Common.Orders;
+using OpenRA.Mods.Common.Traits;
+using OpenRA.Primitives;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.D2k.Traits
+{
+	[Desc("Creates a building placement preview based on the map editor actor preview.")]
+	public class D2kActorPreviewPlaceBuildingPreviewInfo : ActorPreviewPlaceBuildingPreviewInfo
+	{
+		[Desc("Terrain types that should show the 'unsafe' footprint tile.")]
+		public readonly FrozenSet<string> UnsafeTerrainTypes = new HashSet<string> { "Rock" }.ToFrozenSet();
+
+		[Desc("Only check for 'unsafe' footprint tiles when you have these prerequisites.")]
+		public readonly ImmutableArray<string> RequiresPrerequisites = [];
+
+		[Desc("Sprite image to use for the overlay.")]
+		public readonly string Image = "overlay";
+
+		[SequenceReference(nameof(Image))]
+		[Desc("Sprite overlay to use for valid cells.")]
+		public readonly string TileValidName = "build-valid";
+
+		[SequenceReference(nameof(Image))]
+		[Desc("Sprite overlay to use for invalid cells.")]
+		public readonly string TileInvalidName = "build-invalid";
+
+		[SequenceReference(nameof(Image))]
+		[Desc("Sprite overlay to use for blocked cells.")]
+		public readonly string TileUnsafeName = "build-unsafe";
+
+		protected override IPlaceBuildingPreview CreatePreview(WorldRenderer wr, ActorInfo ai, TypeDictionary init)
+		{
+			return new D2kActorPreviewPlaceBuildingPreviewPreview(wr, ai, this, init);
+		}
+
+		public override object Create(ActorInitializer init)
+		{
+			return new D2kActorPreviewPlaceBuildingPreview();
+		}
+	}
+
+	public class D2kActorPreviewPlaceBuildingPreview { }
+
+	sealed class D2kActorPreviewPlaceBuildingPreviewPreview : ActorPreviewPlaceBuildingPreviewPreview
+	{
+		readonly D2kActorPreviewPlaceBuildingPreviewInfo info;
+		readonly bool checkUnsafeTiles;
+		readonly Sprite validTile, unsafeTile, blockedTile;
+		readonly float validAlpha, unsafeAlpha, blockedAlpha;
+		readonly CachedTransform<CPos, List<CPos>> unpathableCells;
+
+		public D2kActorPreviewPlaceBuildingPreviewPreview(WorldRenderer wr, ActorInfo ai, D2kActorPreviewPlaceBuildingPreviewInfo info, TypeDictionary init)
+			: base(wr, ai, info, init)
+		{
+			this.info = info;
+
+			var world = wr.World;
+			var sequences = world.Map.Sequences;
+
+			var techTree = init.Get<OwnerInit>().Value(world).PlayerActor.Trait<TechTree>();
+			checkUnsafeTiles = info.RequiresPrerequisites.Length > 0 && techTree.HasPrerequisites(info.RequiresPrerequisites);
+
+			var validSequence = sequences.GetSequence(info.Image, info.TileValidName);
+			validTile = validSequence.GetSprite(0);
+			validAlpha = validSequence.GetAlpha(0);
+
+			var unsafeSequence = sequences.GetSequence(info.Image, info.TileUnsafeName);
+			unsafeTile = unsafeSequence.GetSprite(0);
+			unsafeAlpha = unsafeSequence.GetAlpha(0);
+
+			var blockedSequence = sequences.GetSequence(info.Image, info.TileInvalidName);
+			blockedTile = blockedSequence.GetSprite(0);
+			blockedAlpha = blockedSequence.GetAlpha(0);
+
+			var buildingInfo = ai.TraitInfo<BuildingInfo>();
+			unpathableCells = new CachedTransform<CPos, List<CPos>>(topLeft => buildingInfo.OccupiedTiles(topLeft).ToList());
+		}
+
+		protected override IEnumerable<IRenderable> RenderFootprint(WorldRenderer wr, CPos topLeft, Dictionary<CPos, PlaceBuildingCellType> footprint,
+			PlaceBuildingCellType filter = PlaceBuildingCellType.Invalid | PlaceBuildingCellType.Valid | PlaceBuildingCellType.LineBuild)
+		{
+			var palette = wr.Palette(info.Palette);
+			var topLeftPos = wr.World.Map.CenterOfCell(topLeft);
+
+			var candidateSafeTiles = unpathableCells.Update(topLeft);
+			foreach (var c in footprint)
+			{
+				if ((c.Value & filter) == 0)
+					continue;
+
+				var isUnsafe =
+					checkUnsafeTiles &&
+					wr.World.Map.Contains(c.Key) &&
+					candidateSafeTiles.Contains(c.Key) &&
+					info.UnsafeTerrainTypes.Contains(wr.World.Map.GetTerrainInfo(c.Key).Type);
+
+				var tile = (c.Value & PlaceBuildingCellType.Invalid) != 0 ? blockedTile : isUnsafe ? unsafeTile : validTile;
+				var sequenceAlpha = (c.Value & PlaceBuildingCellType.Invalid) != 0 ? blockedAlpha : isUnsafe ? unsafeAlpha : validAlpha;
+
+				var pos = wr.World.Map.CenterOfCell(c.Key);
+				var offset = new WVec(0, 0, topLeftPos.Z - pos.Z);
+				var traitAlpha = (c.Value & PlaceBuildingCellType.LineBuild) != 0 ? info.LineBuildFootprintAlpha : info.FootprintAlpha;
+				yield return new SpriteRenderable(tile, pos, offset, -511, palette, 1f, sequenceAlpha * traitAlpha, float3.Ones, TintModifiers.IgnoreWorldTint, true);
+			}
+		}
+	}
+}