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/Widgets/TerrainTemplatePreviewWidget.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 OpenRA.Graphics;
+using OpenRA.Mods.Common.Terrain;
+using OpenRA.Mods.Common.Traits;
+using OpenRA.Widgets;
+
+namespace OpenRA.Mods.Common.Widgets
+{
+	public class TerrainTemplatePreviewWidget : Widget
+	{
+		public float Scale = 1f;
+
+		readonly ITiledTerrainRenderer terrainRenderer;
+		readonly WorldRenderer worldRenderer;
+		readonly WorldViewportSizes viewportSizes;
+
+		TerrainTemplateInfo template;
+
+		public int2 PreviewPos { get; private set; }
+		public int2 IdealPreviewSize { get; private set; }
+
+		[ObjectCreator.UseCtor]
+		public TerrainTemplatePreviewWidget(ModData modData, WorldRenderer worldRenderer, World world)
+		{
+			this.worldRenderer = worldRenderer;
+			viewportSizes = modData.GetOrCreate<WorldViewportSizes>();
+
+			terrainRenderer = world.WorldActor.TraitOrDefault<ITiledTerrainRenderer>();
+			if (terrainRenderer == null)
+				throw new YamlException("TerrainTemplatePreviewWidget requires a tile-based terrain renderer.");
+		}
+
+		protected TerrainTemplatePreviewWidget(TerrainTemplatePreviewWidget other)
+			: base(other)
+		{
+			worldRenderer = other.worldRenderer;
+			viewportSizes = other.viewportSizes;
+			terrainRenderer = other.terrainRenderer;
+			template = other.template;
+			Scale = other.Scale;
+		}
+
+		public override TerrainTemplatePreviewWidget Clone() { return new TerrainTemplatePreviewWidget(this); }
+
+		public void SetTemplate(TerrainTemplateInfo template)
+		{
+			this.template = template;
+			var b = terrainRenderer.TemplateBounds(template);
+			IdealPreviewSize = new int2((int)(b.Width * viewportSizes.DefaultScale), (int)(b.Height * viewportSizes.DefaultScale));
+
+			// Measured from the middle of the widget to the middle of the top-left cell of the template
+			PreviewPos = new int2((int)(b.Left * viewportSizes.DefaultScale), (int)(b.Top * viewportSizes.DefaultScale));
+		}
+
+		public override void Draw()
+		{
+			if (template == null)
+				return;
+
+			var scale = Scale * viewportSizes.DefaultScale;
+			var origin = RenderOrigin - new int2((int)(PreviewPos.X * scale), (int)(PreviewPos.Y * scale));
+
+			foreach (var r in terrainRenderer.RenderUIPreview(worldRenderer, template, origin, scale))
+				r.PrepareRender(worldRenderer).Render(worldRenderer);
+		}
+	}
+}