Windrose dreht sich jetzt

Wetterstation/Form1.cs

@@ -145,10 +145,29 @@ namespace Wetterstation
                 lbWindSpeed.Invoke(new Action(() => { lbWindSpeed.Text = weatherData.windSpeed + " ms"; }));
                 lbWindricht.Invoke(new Action(() => { lbWindricht.Text = weatherData.windDeg + " °"; }));
                 lbLuftdruck.Invoke(new Action(() => { lbLuftdruck.Text = weatherData.pressure + " mbar"; }));
+                pictureBox1.Invoke(new Action(() => {
+                    pictureBox1.Image = RotateImage((Bitmap)global::Wetterstation.Properties.Resources.ResourceManager.GetObject("WindRose_neu"), (int)weatherData.windDeg);
+                }));
             }
             catch (Exception ignored) { }
         }
 
+        private Bitmap RotateImage(Bitmap bmp, float angle)
+        {
+            float height = bmp.Height;
+            float width = bmp.Width;
+            int hypotenuse = System.Convert.ToInt32(System.Math.Floor(Math.Sqrt(height * height + width * width)));
+            Bitmap rotatedImage = new Bitmap(hypotenuse, hypotenuse);
+            using (Graphics g = Graphics.FromImage(rotatedImage))
+            {
+                g.TranslateTransform((float)rotatedImage.Width / 2, (float)rotatedImage.Height / 2); //set the rotation point as the center into the matrix
+                g.RotateTransform(angle); //rotate
+                g.TranslateTransform(-(float)rotatedImage.Width / 2, -(float)rotatedImage.Height / 2); //restore rotation point into the matrix
+                g.DrawImage(bmp, (hypotenuse - width) / 2, (hypotenuse - height) / 2, width, height);
+            }
+            return rotatedImage;
+        }
+
         public void updateFormForecast(String message)
         {
             Console.WriteLine("Entered updateFormForecast");