https://bugs.documentfoundation.org/show_bug.cgi?id=173888

            Bug ID: 173888
           Summary: Add support for Sankey flow charts
           Product: LibreOffice
           Version: Inherited From OOo
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: medium
         Component: Calc
          Assignee: [email protected]
          Reporter: [email protected]

Sankey charts are a rather-popular chart type for illustrating a change in
distribution from one state to another, or a cross-tabulation of data: The
basic (though not only) form is two lines on opposite edges of the chart, each
partitioned according to some distribution of categorized values (different for
each side). Between each pair of right and left categories we draw a "river" -
starting and ending as a straight line and curling according to the category
widths, plus perhaps some logic to minimize confusing occlusions - so one can
tell how the weight of each category gets redistributed among the other-side
categories.

This was recently required by [email protected] in bug 167160 comment #10.

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