Files
Dennis Francis b0b4bad01f chart2: add a correlation circle chart type
A correlation circle plot shows how each feature of a table relates to the
first two dimensions of a decomposition of that table, which a user can now
work out in a spreadsheet with MSVD. One point per feature sits at the
correlation of that feature with the first dimension across and with the
second dimension up, inside a circle of radius one.

The data arrives as one series per feature. Each series holds its own feature
column under the new role values-feature, together with the two dimension
columns under values-x and values-y, which every series shares the way the
bubble chart shares its x column. Keeping the dimensions on the x and y roles
means the point count, the axis scaling and the label machinery need no
special case, and the series label comes from the feature column header, so
the legend and the point labels read as feature names.

The interpreter reads a flat list of columns as a feature table followed by
two dimension columns: the last two are the dimensions and every column before
them is a feature. One range holds the lot, which is what the wizard hands
over, and it is also the order the list comes in when a chart of another type
is turned into this one. A first column of instance names is kept out of the
features when the range says it has them, as it is for a bubble chart.

Both dimensions are numbers running from minus one to one, so the chart type
joins the scatter and the bubble chart in asking for a numeric axis across.
That answer is also what turns the axis of names back into a numeric one when
a chart of another type becomes this one, since the coordinate system the
other type left behind is kept and reused.

Change-Id: Id17d3a2a235c849c3dab9768159ddf1608da6d05
Signed-off-by: Dennis Francis <dennis.francis@collabora.com>
Reviewed-on: https://gerrit.collaboraoffice.com/c/online/+/8102
Tested-by: Tomaž Vajngerl <tomaz.vajngerl@collabora.com>
Reviewed-by: Tomaž Vajngerl <tomaz.vajngerl@collabora.com>
(cherry picked from commit b30d992bba26428941f47f952baf338df3763065)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/209379
Reviewed-by: Xisco Fauli <xiscofauli@libreoffice.org>
Tested-by: Jenkins
2026-09-03 17:07:43 +02:00

353 lines
19 KiB
XML

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