A trellis style set of barcharts with facets

[sg...@mozilla.com]

Hello,

I would like to display trellis style of barcharts. Each panel has a barchart of some measure M for different branches faceted by countries. Each panel in my trellis display

is a year x season. I have 3 years (three rows) and 3 seasons (3 columns) and within each the barchart described above.

In latttice (R) it would be like

barchart( M ~ countries| year*season,groups=branch, data=...)

In this example https://vega.github.io/vega-lite/docs/bar.html#grouped-bar-chart Facets are used for the countries.

However the documentation for Layers( https://vega.github.io/vega-lite/docs/layer.html) says my layers can't have Facets

"Specifications inside layer cannot use row and column channels as layering facet specifications is not allowed."

So how would i go about creating this display?

Cheers

Saptarshi

[Dominik Moritz]

You can put layers into facets instead of facets into layers. To do this, you have to use the more verbose format. I'll update the docs to add a hint about this. 

{

"$schema": "https://vega.github.io/schema/vega-lite/v2.json",

"data": {

"url": "data/cars.json"

},

"facet": {

"row": {

"field": "Origin",

"type": "nominal"

}

},

"spec": {

"layer": [

{

"mark": "bar",

"encoding": {

"x": {

"bin": {

"maxbins": 15

},

"field": "Horsepower",

"type": "quantitative"

},

"y": {

"aggregate": "count",

"type": "quantitative"

}

}

},

{

"mark": "line",

"encoding": {

"x": {

"bin": {

"maxbins": 15

},

"field": "Horsepower",

"type": "quantitative"

},

"y": {

"aggregate": "count",

"type": "quantitative"

},

"color": {

"value": "red"

}

}

}

]

}

}

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