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/CircleAnnotationRenderable.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.Primitives;
+
+namespace OpenRA.Mods.Common.Graphics
+{
+	public class CircleAnnotationRenderable : IRenderable, IFinalizedRenderable
+	{
+		const int CircleSegments = 32;
+		static readonly WVec[] FacingOffsets = Exts.MakeArray(CircleSegments, i => new WVec(1024, 0, 0).Rotate(WRot.FromFacing(i * 256 / CircleSegments)));
+		readonly WDist radius;
+		readonly int width;
+		readonly Color color;
+		readonly bool filled;
+
+		public CircleAnnotationRenderable(WPos centerPosition, WDist radius, int width, Color color, bool filled = false)
+		{
+			Pos = centerPosition;
+			this.radius = radius;
+			this.width = width;
+			this.color = color;
+			this.filled = filled;
+		}
+
+		public WPos Pos { get; }
+		public int ZOffset => 0;
+		public bool IsDecoration => true;
+
+		public IRenderable WithZOffset(int newOffset) { return new CircleAnnotationRenderable(Pos, radius, width, color, filled); }
+		public IRenderable OffsetBy(in WVec vec) { return new CircleAnnotationRenderable(Pos + vec, radius, width, color, filled); }
+		public IRenderable AsDecoration() { return this; }
+
+		public IFinalizedRenderable PrepareRender(WorldRenderer wr) { return this; }
+		public void Render(WorldRenderer wr)
+		{
+			var cr = Game.Renderer.RgbaColorRenderer;
+			if (filled)
+			{
+				var offset = new WVec(radius.Length, radius.Length, 0);
+				var tl = wr.Viewport.WorldToViewPx(wr.ScreenPosition(Pos - offset));
+				var br = wr.Viewport.WorldToViewPx(wr.ScreenPosition(Pos + offset));
+
+				cr.FillEllipse(tl, br, color);
+			}
+			else
+			{
+				var r = radius.Length;
+				var a = wr.Viewport.WorldToViewPx(wr.ScreenPosition(Pos + r * FacingOffsets[CircleSegments - 1] / 1024));
+				for (var i = 0; i < CircleSegments; i++)
+				{
+					var b = wr.Viewport.WorldToViewPx(wr.ScreenPosition(Pos + r * FacingOffsets[i] / 1024));
+					cr.DrawLine(a, b, width, color);
+					a = b;
+				}
+			}
+		}
+
+		public void RenderDebugGeometry(WorldRenderer wr) { }
+		public Rectangle ScreenBounds(WorldRenderer wr) { return Rectangle.Empty; }
+	}
+}