diff --git a/src/IFoxCAD.Cad.Shared/ExtensionMethod/EntityEx.cs b/src/IFoxCAD.Cad.Shared/ExtensionMethod/EntityEx.cs
index d839ba8bdad8b5e714db2014d9591ef63549d673..1ef15f7b67997fb6c9fa203e3446be7c82f13055 100644
--- a/src/IFoxCAD.Cad.Shared/ExtensionMethod/EntityEx.cs
+++ b/src/IFoxCAD.Cad.Shared/ExtensionMethod/EntityEx.cs
@@ -1,4 +1,4 @@
-namespace IFoxCAD.Cad;
+namespace IFoxCAD.Cad;
 
 
 /// <summary>
@@ -158,6 +158,37 @@ public static void ValidateMirror(this DBText txt)
             txt.IsMirroredInY = false;
         }
     }
+
+    /// <summary>
+    /// 获取文字最佳包围点
+    /// </summary>
+    /// <param name="text">文字</param>
+    /// <returns>点集</returns>
+    public static List<Point2d> GetBestBoundPoints(this DBText text)
+    {
+        var angle = text.Rotation % (Math.PI * 0.5);
+        if (angle == Math.PI * 0.25)
+        {
+            var textnew = text.GetTransformedCopy(Matrix3d.Rotation(1e-6, Vector3d.ZAxis, text.AlignmentPoint)) as DBText;
+            return textnew!.GetBestBoundPoints();
+        }
+        var ratio = Math.Abs(Math.Tan(angle));
+        var box = text.GetBoundingBoxEx();
+        var w = box.MaxX - box.MinX;
+        var h = box.MaxY - box.MinY;
+        var a = (w * ratio - h) / (ratio * ratio - 1);
+        var b = (w - ratio * h) / (1 - ratio * ratio);
+        if (a < 0 || b < 0)
+        {
+            var textnew = text.GetTransformedCopy(Matrix3d.Rotation(1e-6, Vector3d.ZAxis, box.Extents3d.MidPoint())) as DBText;
+            return textnew!.GetBestBoundPoints();
+        };
+        var pt1 = new Point2d(box.MinX, box.MinY + a);
+        var pt2 = new Point2d(box.MinX + b, box.MaxY);
+        var pt3 = new Point2d(box.MaxX, box.MaxY - a);
+        var pt4 = new Point2d(box.MaxX - b, box.MinY);
+        return new() { pt1, pt2, pt3, pt4 };
+    }
     #endregion
 
     #region 多行文字