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/DetectionCircleAnnotationRenderable.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 DetectionCircleAnnotationRenderable : IRenderable, IFinalizedRenderable
+	{
+		readonly WDist radius;
+		readonly int trailCount;
+		readonly WAngle trailSeparation;
+		readonly WAngle trailAngle;
+		readonly Color color;
+		readonly float width;
+		readonly Color borderColor;
+		readonly float borderWidth;
+
+		public DetectionCircleAnnotationRenderable(WPos centerPosition, WDist radius, int zOffset,
+			int lineTrails, WAngle trailSeparation, WAngle trailAngle, Color color, float width, Color borderColor, float borderWidth)
+		{
+			Pos = centerPosition;
+			this.radius = radius;
+			ZOffset = zOffset;
+			trailCount = lineTrails;
+			this.trailSeparation = trailSeparation;
+			this.trailAngle = trailAngle;
+			this.color = color;
+			this.width = width;
+			this.borderColor = borderColor;
+			this.borderWidth = borderWidth;
+		}
+
+		public WPos Pos { get; }
+		public int ZOffset { get; }
+		public bool IsDecoration => true;
+
+		public IRenderable WithZOffset(int newOffset)
+		{
+			return new DetectionCircleAnnotationRenderable(Pos, radius, newOffset,
+				trailCount, trailSeparation, trailAngle, color, width, borderColor, borderWidth);
+		}
+
+		public IRenderable OffsetBy(in WVec vec)
+		{
+			return new DetectionCircleAnnotationRenderable(Pos + vec, radius, ZOffset,
+				trailCount, trailSeparation, trailAngle, color, width, borderColor, borderWidth);
+		}
+
+		public IRenderable AsDecoration() { return this; }
+
+		public IFinalizedRenderable PrepareRender(WorldRenderer wr) { return this; }
+		public void Render(WorldRenderer wr)
+		{
+			var cr = Game.Renderer.RgbaColorRenderer;
+			var center = wr.Viewport.WorldToViewPx(wr.Screen3DPosition(Pos));
+
+			for (var i = 0; i < trailCount; i++)
+			{
+				var angle = trailAngle - new WAngle(i * (trailSeparation.Angle <= 512 ? 1 : -1));
+				var length = radius.Length * new WVec(angle.Cos(), angle.Sin(), 0) / 1024;
+				var end = wr.Viewport.WorldToViewPx(wr.Screen3DPosition(Pos + length));
+				var alpha = color.A - i * color.A / trailCount;
+				cr.DrawLine(center, end, borderWidth, Color.FromArgb(alpha, borderColor));
+				cr.DrawLine(center, end, width, Color.FromArgb(alpha, color));
+			}
+
+			RangeCircleAnnotationRenderable.DrawRangeCircle(wr, Pos, radius, width, color, borderWidth, borderColor);
+		}
+
+		public void RenderDebugGeometry(WorldRenderer wr) { }
+		public Rectangle ScreenBounds(WorldRenderer wr) { return Rectangle.Empty; }
+	}
+}