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Services/RenderingService.cs

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+using Hi.Disp;
+using Hi.Geom;
+using Hi.Native;
+using System.Collections.Concurrent;
+
+namespace Hi.Webapi.Services
+{
+    /// <summary>
+    /// 管理 DispEngine 實例和渲染操作的服務
+    /// </summary>
+    public class RenderingService : IDisposable
+    {
+        private readonly ConcurrentDictionary<string, DispEngine> _engines = new();
+        private readonly ILogger<RenderingService> _logger;
+
+        public RenderingService(ILogger<RenderingService> logger)
+        {
+            _logger = logger;
+        }
+
+        /// <summary>
+        /// 創建或獲取一個 DispEngine 實例
+        /// </summary>
+        public DispEngine GetOrCreateEngine(string sessionId)
+        {
+            return _engines.GetOrAdd(sessionId, id =>
+            {
+                _logger.LogInformation($"創建新的 DispEngine，SessionId: {id}");
+                var engine = new DispEngine();
+                engine.BackgroundColor = new Vec3d(0.1, 0.1, 0.5);
+                engine.BackgroundOpacity = 0.1;
+                return engine;
+            });
+        }
+
+        /// <summary>
+        /// 移除指定的 DispEngine
+        /// </summary>
+        public bool RemoveEngine(string sessionId)
+        {
+            if (_engines.TryRemove(sessionId, out var engine))
+            {
+                _logger.LogInformation($"移除 DispEngine，SessionId: {sessionId}");
+                
+                try
+                {
+                    // 停止渲染
+                    engine.IsVisible = false;
+                    
+                    // 釋放資源
+                    engine.Dispose();
+                }
+                catch (Exception ex)
+                {
+                    _logger.LogError(ex, $"清理 DispEngine 時發生錯誤，SessionId: {sessionId}");
+                }
+                
+                return true;
+            }
+            return false;
+        }
+
+        /// <summary>
+        /// 獲取當前活動的引擎數量
+        /// </summary>
+        public int GetActiveEngineCount() => _engines.Count;
+
+        public void Dispose()
+        {
+            foreach (var kvp in _engines)
+            {
+                try
+                {
+                    kvp.Value.IsVisible = false;
+                    kvp.Value.Dispose();
+                }
+                catch (Exception ex)
+                {
+                    _logger.LogError(ex, $"Dispose 時清理引擎錯誤，SessionId: {kvp.Key}");
+                }
+            }
+            _engines.Clear();
+        }
+    }
+}