how to obtain the rotation angle of a textblock in managed code

09-05-2008 10:10 AM |

This is for Silverlight 2 Beta 2. 

  I am trying to obtain the rotation angle of a textblock in managed code. I was trying to use the following code:

 ((RotateTransform)(currentText.RenderTransform)).Angle.

 But I got an error message saying "can not cast MatrixTransform to RotateTransform". Is there anyone who knows how to get the angle of the rotation transform for a textblock?

 Thanks very much!

Re: how to obtain the rotation angle of a textblock in managed code

09-05-2008 10:15 AM |

RenderTransform can contain multiple transforms. You will have to check if it is a TransformGroup or a single transform.

Check out this post for an example:

http://silverlight.net/forums/t/23330.aspx

(If this has answered your question, please click on mark as answer on this post)

Cheers!
Rob Houweling

My blog

Re: how to obtain the rotation angle of a textblock in managed code

09-05-2008 10:16 AM |

How is your XAML for the textblock and the transform ?

Re: how to obtain the rotation angle of a textblock in managed code

09-05-2008 10:26 AM |

robhouweling:

RenderTransform can contain multiple transforms. You will have to check if it is a TransformGroup or a single transform.

Check out this post for an example:

http://silverlight.net/forums/t/23330.aspx

If its a MatrixTransform its not a TransformGroup.

Take a look here.

http://silverlight.net/forums/t/20352.aspx

Re: how to obtain the rotation angle of a textblock in managed code

09-05-2008 12:17 PM |

The following is the way the rotationtransform is originally added to the textblock, it is not declared in a xaml file, it is in managed code:

 RotateTransform rt = new RotateTransform();

 rt.Angle = SliderTextRotation.Value;
 currentText.RenderTransform = rt;

So what I need is to retreive the angle value later from the textblock. It seemed that it is trickier than I thought.