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/PolygonAnnotationRenderable.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 PolygonAnnotationRenderable : IRenderable, IFinalizedRenderable
+	{
+		readonly WPos[] vertices;
+		readonly int width;
+		readonly Color color;
+
+		public PolygonAnnotationRenderable(WPos[] vertices, WPos effectivePos, int width, Color color)
+		{
+			this.vertices = vertices;
+			Pos = effectivePos;
+			this.width = width;
+			this.color = color;
+		}
+
+		public WPos Pos { get; }
+		public int ZOffset => 0;
+		public bool IsDecoration => true;
+
+		public IRenderable WithZOffset(int newOffset) { return new PolygonAnnotationRenderable(vertices, Pos, width, color); }
+
+		public IRenderable OffsetBy(in WVec vec)
+		{
+			// Lambdas can't use 'in' variables, so capture a copy for later
+			var offset = vec;
+			return new PolygonAnnotationRenderable(vertices.Select(v => v + offset).ToArray(), Pos + vec, width, color);
+		}
+
+		public IRenderable AsDecoration() { return this; }
+
+		public IFinalizedRenderable PrepareRender(WorldRenderer wr) { return this; }
+		public void Render(WorldRenderer wr)
+		{
+			var verts = vertices.Select(v => wr.Viewport.WorldToViewPx(wr.ScreenPosition(v)).ToFloat2()).ToArray();
+			Game.Renderer.RgbaColorRenderer.DrawPolygon(verts, width, color);
+		}
+
+		public void RenderDebugGeometry(WorldRenderer wr) { }
+		public Rectangle ScreenBounds(WorldRenderer wr) { return Rectangle.Empty; }
+	}
+}