Hi all,
as far as I understand, we have currently this situation:
Graphic properties
----------------------
A data label is created as css.drawing.TextShape and as such it can have
FillProperties, LineProperties and ShadowProperties.
In ODF, a data label is a <chart:data-label> element and its style can
have graphic properties.
The data labels in MS Office have graphic properties too.
Our model has no explicit data labels, but all about data labels is
contained as properties in a data point or as default in a data series.
But data points and series have graphical properties themselves. So when
graphic properties for data labels were introduced (such doesn't exist
in OOo), new properties of kind "LabelFillColor" were created, see
https://opengrok.libreoffice.org/xref/core/chart2/inc/unonames.hxx
This graphic properties are written to ODF in loext namespace into the
style of the data point or series instead of writing into the style of
the <chart:data-label> element. That is wrong.
If a data label gets graphic properties in MS Office and the file is
written to ODF by MS Office, then the properties are correctly in the
style of the <chart:data-label> element. But LibreOffice cannot
interpret it.
Position
----------
The user can drag a data label to a different position. This corresponds
to "CustomLabelPosition". Latter is relative to the position calculated
from the "LabelPlacement". (Do I understand this correctly?)
ODF has for a user defined position the attributes svg:x and svg:y of
the <chart:data-label> element. These describe the position relative to
top/left of the entire chart.
MS Office uses these attributes in its export to ODF.
(OOXML has the element manualLayout, but I do not understand its unit.)
LibreOffice allows the user to drag the data label, but does not write
the new position into the ODF-file at all and therefore has it lost on
reopening.
So there are discrepancies between what LibreOffice writes and reads and
what exists in ODF. What to do?
Kind regards
Regina
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