Display yellow footprint for cells that trigger damage in D2k.

OpenRA.Mods.Common/Traits/Buildings/ActorPreviewPlaceBuildingPreview.cs

@@ -51,7 +51,7 @@ namespace OpenRA.Mods.Common.Traits
 
 	public class ActorPreviewPlaceBuildingPreview { }
 
-	class ActorPreviewPlaceBuildingPreviewPreview : FootprintPlaceBuildingPreviewPreview
+	public class ActorPreviewPlaceBuildingPreviewPreview : FootprintPlaceBuildingPreviewPreview
 	{
 		readonly ActorPreviewPlaceBuildingPreviewInfo info;
 		readonly PaletteReference palette;

OpenRA.Mods.Common/Traits/Buildings/FootprintPlaceBuildingPreview.cs

@@ -42,7 +42,7 @@ namespace OpenRA.Mods.Common.Traits
 
 	public class FootprintPlaceBuildingPreview { }
 
-	class FootprintPlaceBuildingPreviewPreview : IPlaceBuildingPreview
+	public class FootprintPlaceBuildingPreviewPreview : IPlaceBuildingPreview
 	{
 		protected readonly ActorInfo actorInfo;
 		protected readonly WVec centerOffset;
@@ -72,7 +72,7 @@ namespace OpenRA.Mods.Common.Traits
 
 		protected virtual void TickInner() { }
 
-		protected IEnumerable<IRenderable> RenderFootprint(WorldRenderer wr, CPos topLeft, Dictionary<CPos, PlaceBuildingCellType> footprint,
+		protected virtual IEnumerable<IRenderable> RenderFootprint(WorldRenderer wr, CPos topLeft, Dictionary<CPos, PlaceBuildingCellType> footprint,
 			PlaceBuildingCellType filter = PlaceBuildingCellType.Invalid | PlaceBuildingCellType.Valid | PlaceBuildingCellType.LineBuild)
 		{
 			var cellPalette = wr.Palette(info.Palette);

OpenRA.Mods.D2k/Traits/Buildings/D2kActorPreviewPlaceBuildingPreview.cs

@@ -0,0 +1,88 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2019 The OpenRA Developers (see AUTHORS)
+ * 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.Widgets;
+
+namespace OpenRA.Mods.Common.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 HashSet<string> UnsafeTerrainTypes = new HashSet<string> { "Rock" };
+
+		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 { }
+
+	class D2kActorPreviewPlaceBuildingPreviewPreview : ActorPreviewPlaceBuildingPreviewPreview
+	{
+		readonly D2kActorPreviewPlaceBuildingPreviewInfo info;
+		readonly Sprite buildOk;
+		readonly Sprite buildUnsafe;
+		readonly Sprite buildBlocked;
+		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.Rules.Sequences;
+
+			buildOk = sequences.GetSequence("overlay", "build-valid").GetSprite(0);
+			buildUnsafe = sequences.GetSequence("overlay", "build-unsafe").GetSprite(0);
+			buildBlocked = sequences.GetSequence("overlay", "build-invalid").GetSprite(0);
+
+			var buildingInfo = ai.TraitInfo<BuildingInfo>();
+			unpathableCells = new CachedTransform<CPos, List<CPos>>(topLeft => buildingInfo.UnpathableTiles(topLeft).ToList());
+		}
+
+		protected override IEnumerable<IRenderable> RenderFootprint(WorldRenderer wr, CPos topLeft, Dictionary<CPos, PlaceBuildingCellType> footprint,
+			PlaceBuildingCellType filter = PlaceBuildingCellType.Invalid | PlaceBuildingCellType.Valid | PlaceBuildingCellType.LineBuild)
+		{
+			var cellPalette = wr.Palette(info.Palette);
+			var linePalette = wr.Palette(info.LineBuildSegmentPalette);
+			var topLeftPos = wr.World.Map.CenterOfCell(topLeft);
+
+			var candidateSafeTiles = unpathableCells.Update(topLeft);
+			foreach (var c in footprint)
+			{
+				if ((c.Value & filter) == 0)
+					continue;
+
+				var tile = c.Value.HasFlag(PlaceBuildingCellType.Invalid) ? buildBlocked :
+					candidateSafeTiles.Contains(c.Key) && info.UnsafeTerrainTypes.Contains(wr.World.Map.GetTerrainInfo(c.Key).Type)
+					? buildUnsafe : buildOk;
+
+				var pal = c.Value.HasFlag(PlaceBuildingCellType.LineBuild) ? linePalette : cellPalette;
+				var pos = wr.World.Map.CenterOfCell(c.Key);
+				var offset = new WVec(0, 0, topLeftPos.Z - pos.Z);
+				yield return new SpriteRenderable(tile, pos, offset, -511, pal, 1f, true);
+			}
+		}
+	}
+}

mods/d2k/rules/defaults.yaml

@@ -385,7 +385,7 @@
 		Footprint: x
 		TerrainTypes: Rock, Concrete
 		BuildSounds: BUILD1.WAV
-	ActorPreviewPlaceBuildingPreview:
+	D2kActorPreviewPlaceBuildingPreview:
 		OverridePalette: placebuilding
 	RequiresBuildableArea:
 		AreaTypes: building

mods/d2k/sequences/misc.yaml

@@ -169,12 +169,14 @@ rank:
 overlay:
 	Defaults: DATA.R8
 		Offset: -16,-16
-	build-valid-arrakis:
+	build-valid:
+	build-unsafe: concfoot.shp
+		Offset: 0, 0
 	build-invalid:
 		Start: 1
 	target-select:
 		Start: 2
-	target-valid-arrakis:
+	target-valid:
 	target-invalid:
 		Start: 1