[Libreoffice-bugs] [Bug 113494] New: FILESAVE: New feature image rotation uses wrong value in transformation attribute

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=113494

            Bug ID: 113494
           Summary: FILESAVE: New feature image rotation uses wrong value
                    in transformation attribute
           Product: LibreOffice
           Version: 6.0.0.0.alpha1+ Master
          Hardware: x86 (IA32)
                OS: Windows (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: high
         Component: Writer
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: rb.henschel at t-online.de

Insert an image in a text document and rotate it by 30°. Save document. Unpack
it and examine the attribute "transform" of the <draw:frame> element of the
image.

LibreOffice has a distinction between an image as SwXTextGraphicObject or as
SwXShape. ODF 1.2 has no such distinction. In both cases the file format has a
<draw:frame> element with <draw:image> child element and a style of family
"graphic".

That means, that from the view of the file format the attributes of a rotated
image derived from a SwXshape have to be the same as derived from a
SwXTextGraphicObject. Every converting needed for the internal model has to be
done outside of those attributes, which are saved/loaded to/from file.

That is not the case in the new feature of rotating a text graphic in Writer.
Example: Using 30deg as rotation angle in the UI results in the attribute
draw:transform="rotate(300)".

This is wrong in two aspects:
(1) The rotation angle should be in radians, but it is in 1/10degree.
(2) Rotations are done around coordinate system origin, and to get the rotated
object to the correct position an additional translate-transformation is
necessary.

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