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/Traits/Buildings/FootprintPlaceBuildingPreview.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.Generic;
+using System.Linq;
+using OpenRA.Graphics;
+using OpenRA.Mods.Common.Orders;
+using OpenRA.Primitives;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	[Desc("Creates a building placement preview showing only the building footprint.")]
+	public class FootprintPlaceBuildingPreviewInfo : TraitInfo<FootprintPlaceBuildingPreview>, IPlaceBuildingPreviewGeneratorInfo
+	{
+		[PaletteReference]
+		[Desc("Palette to use for rendering the placement sprite.")]
+		public readonly string Palette = TileSet.TerrainPaletteInternalName;
+
+		[Desc("Custom opacity to apply to the placement sprite.")]
+		public readonly float FootprintAlpha = 1f;
+
+		[Desc("Custom opacity to apply to the line-build placement sprite.")]
+		public readonly float LineBuildFootprintAlpha = 1f;
+
+		protected virtual IPlaceBuildingPreview CreatePreview(WorldRenderer wr, ActorInfo ai, TypeDictionary init)
+		{
+			return new FootprintPlaceBuildingPreviewPreview(wr, ai, this);
+		}
+
+		IPlaceBuildingPreview IPlaceBuildingPreviewGeneratorInfo.CreatePreview(WorldRenderer wr, ActorInfo ai, TypeDictionary init)
+		{
+			return CreatePreview(wr, ai, init);
+		}
+	}
+
+	public class FootprintPlaceBuildingPreview { }
+
+	public class FootprintPlaceBuildingPreviewPreview : IPlaceBuildingPreview
+	{
+		protected readonly ActorInfo ActorInfo;
+		protected readonly WVec CenterOffset;
+		readonly FootprintPlaceBuildingPreviewInfo info;
+		readonly IPlaceBuildingDecorationInfo[] decorations;
+		readonly int2 topLeftScreenOffset;
+		readonly Sprite validTile, blockedTile;
+		readonly float validAlpha, blockedAlpha;
+
+		public FootprintPlaceBuildingPreviewPreview(WorldRenderer wr, ActorInfo ai, FootprintPlaceBuildingPreviewInfo info)
+		{
+			ActorInfo = ai;
+			this.info = info;
+			decorations = ActorInfo.TraitInfos<IPlaceBuildingDecorationInfo>().ToArray();
+
+			var world = wr.World;
+			CenterOffset = ActorInfo.TraitInfo<BuildingInfo>().CenterOffset(world);
+			topLeftScreenOffset = -wr.ScreenPxOffset(CenterOffset);
+
+			var tileset = world.Map.Tileset.ToLowerInvariant();
+			var sequences = world.Map.Sequences;
+			if (sequences.HasSequence("overlay", $"build-valid-{tileset}"))
+			{
+				var validSequence = sequences.GetSequence("overlay", $"build-valid-{tileset}");
+				validTile = validSequence.GetSprite(0);
+				validAlpha = validSequence.GetAlpha(0);
+			}
+			else
+			{
+				var validSequence = sequences.GetSequence("overlay", "build-valid");
+				validTile = validSequence.GetSprite(0);
+				validAlpha = validSequence.GetAlpha(0);
+			}
+
+			var blockedSequence = sequences.GetSequence("overlay", "build-invalid");
+			blockedTile = blockedSequence.GetSprite(0);
+			blockedAlpha = blockedSequence.GetAlpha(0);
+		}
+
+		protected virtual void TickInner() { }
+
+		protected virtual 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);
+			foreach (var c in footprint)
+			{
+				if ((c.Value & filter) == 0)
+					continue;
+
+				var tile = (c.Value & PlaceBuildingCellType.Invalid) != 0 ? blockedTile : validTile;
+				var sequenceAlpha = (c.Value & PlaceBuildingCellType.Invalid) != 0 ? blockedAlpha : 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);
+			}
+		}
+
+		protected virtual IEnumerable<IRenderable> RenderAnnotations(WorldRenderer wr, CPos topLeft)
+		{
+			var centerPosition = wr.World.Map.CenterOfCell(topLeft) + CenterOffset;
+			foreach (var d in decorations)
+				foreach (var r in d.RenderAnnotations(wr, wr.World, ActorInfo, centerPosition))
+					yield return r;
+		}
+
+		protected virtual IEnumerable<IRenderable> RenderInner(WorldRenderer wr, CPos topLeft, Dictionary<CPos, PlaceBuildingCellType> footprint)
+		{
+			return RenderFootprint(wr, topLeft, footprint);
+		}
+
+		IEnumerable<IRenderable> IPlaceBuildingPreview.Render(WorldRenderer wr, CPos topLeft, Dictionary<CPos, PlaceBuildingCellType> footprint)
+		{
+			return RenderInner(wr, topLeft, footprint);
+		}
+
+		IEnumerable<IRenderable> IPlaceBuildingPreview.RenderAnnotations(WorldRenderer wr, CPos topLeft)
+		{
+			return RenderAnnotations(wr, topLeft);
+		}
+
+		void IPlaceBuildingPreview.Tick() { TickInner(); }
+
+		int2 IPlaceBuildingPreview.TopLeftScreenOffset => topLeftScreenOffset;
+	}
+}