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/Graphics/IsometricSelectionBoxAnnotationRenderable.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.Linq;
+using OpenRA.Graphics;
+using OpenRA.Primitives;
+
+namespace OpenRA.Mods.Common.Graphics
+{
+	public class IsometricSelectionBoxAnnotationRenderable : IRenderable, IFinalizedRenderable
+	{
+		static readonly float2 TLOffset = new(-12, -6);
+		static readonly float2 TROffset = new(12, -6);
+		static readonly float2 TOffset = new(0, -13);
+		static readonly float2[] Offsets =
+		[
+			-TROffset, -TLOffset, -TOffset,
+			TROffset, -TOffset, -TLOffset,
+			-TLOffset, TOffset, TROffset,
+			TLOffset, TROffset, TOffset,
+			-TROffset, TOffset, TLOffset,
+			TLOffset, -TOffset, -TROffset
+		];
+		readonly Polygon bounds;
+		readonly Color color;
+
+		public IsometricSelectionBoxAnnotationRenderable(Actor actor, in Polygon bounds, Color color)
+		{
+			Pos = actor.CenterPosition;
+			this.bounds = bounds;
+			this.color = color;
+		}
+
+		public IsometricSelectionBoxAnnotationRenderable(WPos pos, in Polygon bounds, Color color)
+		{
+			Pos = pos;
+			this.bounds = bounds;
+			this.color = color;
+		}
+
+		public WPos Pos { get; }
+
+		public int ZOffset => 0;
+		public bool IsDecoration => true;
+
+		public IRenderable WithZOffset(int newOffset) { return this; }
+		public IRenderable OffsetBy(in WVec vec) { return new IsometricSelectionBoxAnnotationRenderable(Pos + vec, bounds, color); }
+		public IRenderable AsDecoration() { return this; }
+
+		public IFinalizedRenderable PrepareRender(WorldRenderer wr) { return this; }
+
+		public void Render(WorldRenderer wr)
+		{
+			var screen = bounds.Vertices.Select(v => wr.Viewport.WorldToViewPx(v).ToFloat2()).ToArray();
+
+			var tl = new float2(-12, -6);
+			var tr = new float2(12, -6);
+			var t = new float2(0, -13);
+
+			var cr = Game.Renderer.RgbaColorRenderer;
+			for (var i = 0; i < 6; i++)
+			{
+				cr.DrawLine([screen[i] + Offsets[3 * i], screen[i], screen[i] + Offsets[3 * i + 1]], 1, color, true);
+				cr.DrawLine([screen[i], screen[i] + Offsets[3 * i + 2]], 1, color, true);
+			}
+		}
+
+		public void RenderDebugGeometry(WorldRenderer wr) { }
+		public Rectangle ScreenBounds(WorldRenderer wr) { return Rectangle.Empty; }
+	}
+}