From 45ef4a3cc2515cd2777f61bbbe25f0fd34eb2294 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E8=89=BE=E7=AB=B9?= <akwkevin@126.com>
Date: Sun, 1 Oct 2023 23:26:22 +0800
Subject: [PATCH] ink

---
 AIStudio.Wpf.DiagramDesigner/Helpers/DrawingHelper.cs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/AIStudio.Wpf.DiagramDesigner/Helpers/DrawingHelper.cs b/AIStudio.Wpf.DiagramDesigner/Helpers/DrawingHelper.cs
index f0e5fa0..0e8199d 100644
--- a/AIStudio.Wpf.DiagramDesigner/Helpers/DrawingHelper.cs
+++ b/AIStudio.Wpf.DiagramDesigner/Helpers/DrawingHelper.cs
@@ -93,5 +93,12 @@ namespace AIStudio.Wpf.DiagramDesigner
             }
             return positiveAngle;
         }
+
+        public static Point RotatePoint(Point point, Point center, double angle)
+        {
+            var x = (point.X - center.X) * Math.Cos(Math.PI / 180.0 * angle) - (point.Y - center.Y) * Math.Sin(Math.PI / 180.0 * angle) + center.X;
+            var y = (point.X - center.X) * Math.Sin(Math.PI / 180.0 * angle) + (point.Y - center.Y) * Math.Cos(Math.PI / 180.0 * angle) + center.Y;
+            return new Point(x, y);
+        }
     }
 }