[PieVis] Adapt for Canvas and Lens.

[Kuznietsov]

Introduction

After moving out the pieVis expression from vis_types, it is required to decide what to add to the existent API of pieVis.

Short investigation

Comparing pieVis from vis_types and lens_pie_renderer, there are such differences in the API and in the functionality:

VisEditors Pie			Lens Pie
Field	Type, single/multi	Default	Field	Type, single/multi
metric	visdimension		metric	string
bucket	visdimension, multi		groups	string, multi
addLegend	boolean		legendDisplay	string (default/show/hide)
legendPosition	string		legendPosition	string
nestedLegend	boolean	false	nestedLegend	boolean
truncateLegend	boolean	true	truncateLegend	boolean
maxLegendLines	number		legendMaxLines	number
isDonut	boolean	false	shape	string (pie/donut/treemap/mosaic)
emptySizeRatio	number		emptySizeRatio	number
labels	'pie_labels_value
labels.show	boolean		hideLabels	boolean
labels.percentDecimals	number	2	percentDecimals	number
labels.valuesFormat	string	'percent'	numberDisplay	string (hidden/percent/value)
labels.values	boolean		--
labels.position	string	'default'	categoryDisplay	string (default/inside/hide)
labels.lastLevel	boolean	true	--
labels.truncate	number		--
splitColumn	visdimension, multi		--
splitRow	visdimension, multi		--
addTooltip	boolean	true	--
distinctColors	boolean	false	--
--			showValuesInLegend	boolean

Adaptation notes

Globally

• Replace data.fieldFormats with fieldFormats plugin.
• Add full support of visdimension at fields: metric, bucket, splitColumn, splitRow.
• Change palette type from string to palette.

Addressed at the PR: #121763

---

For Canvas

• ...

cc @crob611.

---

For Lens

• Add new expression functions for supporting mosaic, treemap and waffle charts.
• Waffle only supports a single bucket/group dimension.
• Mosaic supports only up to two bucket/group dimensions.
• Treemap supports only up to two bucket/group dimensions.

Source: #121725 (comment).
Addressed at the PR: #122420

@elastic/kibana-vis-editors, please, feel free to add some notes and plans to this issue.

cc @stratoula and @flash1293.

[elasticmachine]

Pinging @elastic/kibana-vis-editors @elastic/kibana-vis-editors-external (Team:VisEditors)

[elasticmachine]

Pinging @elastic/kibana-presentation (Team:Presentation)

[stratoula]

The title and description in lens expression function is not needed anymore so I think we can remove them from the list :)

[stratoula]

Also the lens categoryDisplay is connected with the labels position if I am not mistaken so it should be matched with the labels.position property of viz.

[flash1293]

AFAIK Visualize pie doesn't support multiple metrics. While there's a use case for that, I think we shouldn't introduce it as part of this PR but split that out for later and stick with just a single metric dimension for now.

The other settings look like they can be merged into a single renderer supporting everything pretty well. Please note that mosaic and waffle have additional limitations compared to pie/donut. Waffle only supports a single bucket/group dimension and Mosaic supports only up to two.

[Kuznietsov]

@flash1293, added those details to the issue's text.