From cd8930ea1fb6d7888653e9d22ba2be8d64318ab3 Mon Sep 17 00:00:00 2001
From: DYH <1742647821@qq.com>
Date: Mon, 12 Dec 2022 12:28:00 +0000
Subject: [PATCH] =?UTF-8?q?update=20src/IFoxCAD.Cad.Shared/ExtensionMethod?=
 =?UTF-8?q?/EntityEx.cs.=20=E6=B7=BB=E5=8A=A0=EF=BC=8C=E8=8E=B7=E5=8F=96?=
 =?UTF-8?q?=E6=96=87=E5=AD=97=E6=9C=80=E4=BD=B3=E5=8C=85=E5=9B=B4=E7=82=B9?=
 =?UTF-8?q?public=20static=20List<Point2d>=20GetBestBoundPoints(this=20DBT?=
 =?UTF-8?q?ext=20text)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: DYH <1742647821@qq.com>
---
 .../ExtensionMethod/EntityEx.cs               | 33 ++++++++++++++++++-
 1 file changed, 32 insertions(+), 1 deletion(-)

diff --git a/src/IFoxCAD.Cad.Shared/ExtensionMethod/EntityEx.cs b/src/IFoxCAD.Cad.Shared/ExtensionMethod/EntityEx.cs
index d839ba8..1ef15f7 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
-- 
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