questions regarding of-pie chart work

[Kurt Nordback]

I've been working on support for bar-of-pie and pie-of-pie charts. Related bug is here:
https://bugs.documentfoundation.org/show_bug.cgi?id=50934
and gerrit page for my preliminary implementation is here:
https://gerrit.libreoffice.org/c/core/+/160742 (feedback welcome!)

I have several questions about how to take this further. It seems like the bug page and gerrit aren't the right places for discussing these, so I'm raising them here.

- I've implemented OOXML import/export, but not ODF import/export because ODF doesn't support of-pie charts. The spec [19.15] does say: "Additional chart types may be supported by using a different namespace." But I'm not sure what that really means. Are there examples of this already?
- I made various UI choices that may not be best. For instance, I added pie-of-pie and bar-of-pie as subtypes of pie in the chart selection matrix (widening it to 6 columns). It might be preferable to keep of-pie as a different chart type (adding a row instead of two columns). I also made arbitrary decisions about sizes and separation of the two chart parts in the rendering. It appears there's a UI group that meets. Are these choices the kind of things that could be put on their agenda?
- In the selection matrix mentioned above I added crude placeholder graphics that I created just by taking a screenshot of representative of-pie charts. But they look nothing like the graphics for the other chart types. Is there some prescribed process (or person) for creating uniform-looking UI graphics?

Thanks for any input you can provide.

Kurt Nordback
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