Rotating Cursor According to Rotated TextBox

You can rotate your cursor using the System.Drawing.Icon class from WinForms in combination with WPF's bitmap rotation ability.

The way to do this is to load the icon, convert it to a BitmapSource, use Image and RenderTargetBitmap to rotate it, convert it back to an Icon, save it, and finally update bytes 2, 10, and 11 that make it a .cur instead of a .ico.

Here's what the code looks like:

public Cursor GetRotatedCursor(byte[] curFileBytes, double rotationAngle){  // Load as Bitmap, convert to BitmapSource  var origStream = new MemoryStream(curFileBytes);  var origBitmap = new System.Drawing.Icon(origStream).ToBitmap();  var origSource = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(origBitmap.GetHBitmap());  // Construct rotated image  var image = new Image  {    BitmapSource = origSource,    RenderTransform = new RotateTransform(rotationAngle)  };  // Render rotated image to RenderTargetBitmap  var width = origBitmap.Width;  var height = origBitmap.Height;  var resultSource = new RenderTargetBitmap(width, height, 96, 96, PixelFormats.Pbgra32);  resultSource.Render(image);  // Convert to System.Drawing.Bitmap  var pixels = new int[width*height];  resultSource.CopyPixels(pixels, width, 0);  var resultBitmap = new System.Drawing.Bitmap(width, height, System.Drawing.Imaging.PixelFormat.Format32bppPargb);  for(int y=0; y<height; y++)    for(int x=0; x<width; x++)      resultBitmap.SetPixel(x, y, Color.FromArgb(pixels[y*width+x]));  // Save to .ico format  var resultStream = new MemoryStream();  new System.Drawing.Icon(resultBitmap.GetHIcon()).Save(resultStream);  // Convert saved file into .cur format  resultStream.Seek(2); resultStream.WriteByte(curFileBytes, 2, 1);  resultStream.Seek(10); resultStream.WriteByte(curFileBytes, 10, 2);  resultStream.Seek(0);  // Construct Cursor  return new Cursor(resultStream);}

If you want to avoid the loop, you can replace it with a small bit of usafe code to call the System.Drawing.Bitmap constructor that takes initialization data:

  fixed(int* bits = pixels)  {    resultBitmap = new System.Drawing.Bitmap(width, height, width, System.Drawing.Imaging.PixelFormat.Format32bppPargb, new IntPtr(bits));  }

You'll need to call this every time your TextBox rotation changes. This can be done either from the code that rotates your TextBox, or from a PropertyChangedCallback on a value that is bound to the TextBox's rotation.

mmm I'm not sure... but since the cursor is managed by Windows.. I guess you would need to hide the cursor when it enters the textbox and draw your own (which would be easy to rotate since you are rotating the other controls).

Heh, Googling for a way to do this, the first result was naturally from SO, you might wanna check the accepted answer (if you are using wpf):

Custom cursor in WPF?