Drawing protractor annotation

Hello,

after updating from Leadtools 15 to Leadtools 17.5 a NullReferenceException was thrown
while drawing a protractor annotation. All other kinds of annotations can be drawn without
problems.

Stack Trace:

bei Leadtools.Annotations.ProtractorDrawer.Draw(Graphics graphics)
bei Leadtools.Annotations.AnnProtractorObject.DrawObject(Graphics graphics)
bei Leadtools.Annotations.AnnObject.Draw(Graphics graphics)
bei Leadtools.Annotations.AnnDrawDesigner.OnAfterDrawingObjects(Object sender, AnnPaintEventArgs e)
bei Leadtools.Annotations.AnnContainer.OnAfterDrawingObjects(AnnPaintEventArgs e)
bei Leadtools.Annotations.AnnContainer.Draw(Graphics graphics)
bei Leadtools.Annotations.AnnAutomation.a(Object A_0, PaintEventArgs A_1)
bei Leadtools.Annotations.RasterImageViewerAutomationControl.a(Object A_0, PaintEventArgs A_1)
bei Leadtools.WinForms.RasterImageViewer.OnPostImagePaint(PaintEventArgs e)
bei Leadtools.WinForms.RasterImageViewer.RedirectPaint(Graphics graphics, Rectangle src, Rectangle dest, Rectangle destClip, Matrix transform, Boolean ignoreWorldTransform, RasterPaintDisplayModeFlags displayFlags, Boolean fromPan)
bei Leadtools.WinForms.RasterImageViewer.RedirectPaint(Graphics graphics, Rectangle src, Rectangle dest, Rectangle destClip, Matrix transform)
bei Leadtools.WinForms.RasterImageViewer.OnPaint(PaintEventArgs e)


We are using Leadtools 17.5 .NET, please let me know if you need an example project.

Henk,
Please answer the following questions:
1- What is the exact line of code that throws this error?
2- What is the file version (right-click->properties) of Leadtools.dll, Leadtools.Annotations.dll and Leadtools.Annotations.Core.dll that you are using?
3- Can you reproduce the issue using any of our demos? If yes, which one? What is the exact steps to reproduce?
4- If this issue only appears with your code, can you create a small sample project (NOT your full application) that shows the issue and put it inside ZIP or RAR file and upload it?
5- What is the Windows version (XP, Vista, 7, 8..etc) that you are seeing the issue on? Is it 32-bit or 64-bit? And Is it the development machine or the deployment machine?
6- Is LEADTOOLS installed on the machine that shows the issue or not?

Note: If you are going to upload files to the forums, do NOT use the "Preview" option.

1- I can't determine the exact line of code, the exception appears in Application.Run
Here is the full stack trace of the exception:

System.NullReferenceException was unhandled
HResult=-2147467261
Message=Der Objektverweis wurde nicht auf eine Objektinstanz festgelegt.
Source=Leadtools.Annotations
StackTrace:
bei Leadtools.Annotations.ProtractorDrawer.Draw(Graphics graphics)
bei Leadtools.Annotations.AnnProtractorObject.DrawObject(Graphics graphics)
bei Leadtools.Annotations.AnnObject.Draw(Graphics graphics)
bei Leadtools.Annotations.AnnDrawDesigner.OnAfterDrawingObjects(Object sender, AnnPaintEventArgs e)
bei Leadtools.Annotations.AnnContainer.OnAfterDrawingObjects(AnnPaintEventArgs e)
bei Leadtools.Annotations.AnnContainer.Draw(Graphics graphics)
bei Leadtools.Annotations.AnnAutomation.a(Object A_0, PaintEventArgs A_1)
bei Leadtools.Annotations.RasterImageViewerAutomationControl.a(Object A_0, PaintEventArgs A_1)
bei Leadtools.WinForms.RasterImageViewer.OnPostImagePaint(PaintEventArgs e)
bei Leadtools.WinForms.RasterImageViewer.RedirectPaint(Graphics graphics, Rectangle src, Rectangle dest, Rectangle destClip, Matrix transform, Boolean ignoreWorldTransform, RasterPaintDisplayModeFlags displayFlags, Boolean fromPan)
bei Leadtools.WinForms.RasterImageViewer.RedirectPaint(Graphics graphics, Rectangle src, Rectangle dest, Rectangle destClip, Matrix transform)
bei Leadtools.WinForms.RasterImageViewer.OnPaint(PaintEventArgs e)
bei System.Windows.Forms.Control.PaintWithErrorHandling(PaintEventArgs e, Int16 layer)
bei System.Windows.Forms.Control.WmPaint(Message& m)
bei System.Windows.Forms.Control.WndProc(Message& m)
bei Leadtools.WinForms.RasterImageViewer.WndProc(Message& m)
bei System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
bei System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
bei System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

2- Leadtools.dll 17.5.0.62
Leadtools.Annotations.dll 17.5.0.21
Leadtools.Annotations.Core.dll 17.5.0.5

3- No, I can't reproduce the issue with your demos.

4- Please see the ZIP file attached. Click Protractor and try to draw the annotation.
5- Windows 8, development machine, 64-Bit (but 32-Bit Leadtools and application)
6- Leadtools is installed on the machine.

Best regards.

Henk,
It appears that your code is missing the following line of code:
=============
protractorObject.Font =  new AnnFont(FontFamily.GenericSansSerif, new AnnLength(11), FontStyle.Regular);
=============
For the AnnProtactor object, it is necessary to set the font.

That's it. Thanks for the quick support.