I want to use "Vega Lite" to achieve the faceted nesting effect similar to tableau. Although "Vega Lite" can also be achieved, the display effect is not satisfactory, which is mainly reflected in that each sub chart has its own coordinate axis label, and the information density is not high. Tableau is much more compact.
This is an example of tableau:
This is an example of vega-lite:
{
"data": {"url": "https://uniplore-source.oss-cn-chengdu.aliyuncs.com/other/orders2.csv"},
"spacing": 0,
"facet": {"row": {"field": "快递方式","type": "nominal",
"header":{"labelExpr": "null"}
}},
"spec": {
"facet": {"column": {"field": "类别","type": "nominal","header":{"labelExpr": "null"}}},
"spacing": 0,
"spec": {
"spacing": 0,
"facet": {
"column": {
"field": "子类别","type": "nominal"
}
},
"spec": {
"facet": {
"column": {
"field": "细分","type": "nominal"
}
},
"spec": {
"mark": "bar",
"spacing": 0,
"encoding": {
"x": {
"field": "细分","type": "nominal"
},
"y": {"aggregate": "sum","field":"销售额"}
}
}
}
}
}
}
You can view my example here.
In fact, the same amount of information can not be displayed on one screen with Vega Lite.
I have tried some configurations, but the effect is not obvious.
I want to know if there is any way Vega Lite can achieve the display effect of tableau.
The most important of these is shared labels.
Thank you.
If you mean shared axes, then you can do this using facet.
https://vega.github.io/vega-lite/docs/facet.html
Edit 1
Editor
{
"$schema": "https://vega.github.io/schema/vega-lite/v5.json",
"name": "trellis_barley",
"description": "The Trellis display by Becker et al. helped establish small multiples as a “powerful mechanism for understanding interactions in studies of how a response depends on explanatory variables”. Here we reproduce a trellis of Barley yields from the 1930s, complete with main-effects ordering to facilitate comparison.",
"data": {"url": "data/barley.json"},
"mark": "point",
"height": {"step": 12},
"encoding": {
"facet": {
"spacing": {"row": -40},
"field": "site",
"type": "ordinal",
"columns": 2,
"sort": {"op": "median", "field": "yield"},
"header":{"labelExpr": "null"}
},
"x": {
"aggregate": "median",
"field": "yield",
"type": "quantitative",
"scale": {"zero": false}
},
"y": {"field": "variety", "type": "ordinal", "sort": "-x"},
"color": {"field": "year", "type": "nominal"}
}
}
Related
I've been trying to edit my legend on a line chart to use different symbols for each field in the series. My output on the actual chart is showing correctly, where each series had a different symbol, but my legend duplicates the series, one showing the original shapes with the correct colors, the other showing the correct shapes with the wrong color (just black). Am I missing something about how these properties need to be combined so it's not duplicated? Thanks in advance for the help. Link to online editor
Doubled Legend Series Image
(also how do I get images to just show up in the post??)
Thanks,
Bryan
{
"$schema": "https://vega.github.io/schema/vega-lite/v5.json",
"data": {"url": "data/barley.json"},
"layer": [
{
"mark": {"type": "line", "tooltip": true, "interpolate": "linear"},
"encoding": {
"stroke": {"field": "site", "type": "nominal", "legend": null},
"opacity": {
"condition": {
"test": {"field": "__selected__", "equal": "false"},
"value": 0.3
},
"value": 1
}
}
},
{
"mark": {"type": "point"},
"encoding": {
"shape": {"field": "site", "type": "nominal"},
"color": {"field": "site", "type": "nominal"},
"opacity": {
"condition": {
"test": {"field": "__selected__", "equal": "false"},
"value": 0.3
},
"value": 1
}
}
}
],
"encoding": {
"y": {
"field": "variety",
"type": "nominal",
"axis": {"grid": true},
"sort": {
"op": "average",
"field": "All Except Difference",
"order": "descending"
}
},
"x": {
"field": "yield",
"type": "quantitative",
"sort": {
"op": "average",
"field": "All Except Difference",
"order": "descending"
},
"scale": {"zero": false}
}
}
}
My vega lite json: Open the Chart in the Vega Editor
{
"$schema": "https://vega.github.io/schema/vega-lite/v5.json",
"layer": [
{
"data": {"url": "data/cars.json"},
"params": [
{
"name": "grid",
"select": "interval",
"bind": "scales"
}
],
"mark": "circle",
"encoding": {
"x": {"field": "Horsepower", "type": "quantitative"},
"y": {"field": "Miles_per_Gallon", "type": "quantitative"},
"color": {
"field": "Horsepower",
"type": "quantitative",
"scale": {
"range": ["blue", "blue"]
}
}
}
},
{
"data": {"url": "data/cars.json"},
"mark": "circle",
"encoding": {
"x": {"field": "Miles_per_Gallon", "type": "quantitative"},
"y": {"field": "Acceleration", "type": "quantitative"},
"color": {
"field": "Displacement",
"type": "quantitative",
"scale": {
"range": ["black", "black"]
}
}
}
}
]
}
I'm displaying 2 layers of scratter plot, so I want it to have 2 legend color bars.
When I use "color", the second legend is merged, and overriden by the first one.
When I change to use "fill", I manage to have 2 different color bars. But what if I have 4 layers, how to do it?
You need to add the resolve property.
"resolve": {"legend":{"color": "independent"}, "scale": {"color": "independent"} }
Sample on vega editor:
Open the Chart in the Vega Editor
Here's my wandb vega. The problem is, right now, it is very hard to mouse over my line and get the tooltip to show. It is like you must hover over the exact pixel of the line with your mouse. How do I make the activation radius larger, so my tooltip shows up if I am approximately on top of the point of my line?
{
"$schema": "https://vega.github.io/schema/vega-lite/v4.json",
"description": "A plot for an arbitrary number of lines",
"data": {
"name": "wandb"
},
"transform": [
{"filter": {"field": "${field:lineVal}", "valid": true}},
{"filter": {"field": "${field:step}", "valid": true}}
],
"title": "${string:title}",
"layer": [
{
"selection": {
"grid": {
"type": "interval",
"bind": "scales"
}
},
"mark": {"type": "line", "strokeWidth": 5, "interpolate": "linear", "tooltip": true},
"encoding": {
"x":{
"field": "${field:step}",
"type": "quantitative",
"title": "${string:xname}"
},
"y": {
"field": "${field:lineVal}",
"title": "y",
"type": "quantitative"
},
"color": {
"type": "nominal",
"field": "${field:lineKey}"
},
"strokeDash": {
"type": "nominal",
"field": "name"
}
}
}
]
}
You haven't provided the data along with your schema so it is difficult to answer your specific case. However, you should be able to adapt the example code from https://vega.github.io/vega-lite/examples/interactive_multi_line_pivot_tooltip.html to achieve what you want.
I'm looking for a vega-lite configuration to show small multiples (using the facet operator row or column) with all other data points greyed out in the background.
Here is an example plot using the facet-operator:
facet plot
in vega-editor
"facet": {
"row": {
"field": "group",
"type": "nominal"
}
},
And here is an example using multiple charts with the concat operator and color channel to grey out other groups:
concat-plot
in vega-editor
"color": {"condition": {"test": "datum['group'] != 1", "value": "grey"}, "value": "red"}
I was wondering if there is a combination of transforms and repeat commands to achieve this for an unknown number of groups.
Here is one possible solution:
create an additional layer with new data
"facet": {"row": {"field": "group"}},
"spec": {
"layer": [
{
"data": {"name": "main"},
"mark": "circle",
"encoding": {
"y": {
"field": "y",
"type": "ordinal"
},
"x": {
"field": "x",
"type": "ordinal"
},
"color": {"value": "grey"}
},
"params": []
},
{
"mark": {"type": "circle", "opacity": 1, "color": "red"},
"encoding": {
"y": {
"field": "y",
"type": "ordinal"
},
"x": {
"field": "x",
"type": "ordinal"
}
}
}
]
}
full example in vega editor
I am struggling to understand why a layer spec like the below:
"layer": [
{"encoding": {
"facet": {"field": "FEATURE_VALUE"},
"x": {
"field": "DATE",
"type": "temporal"
},
"y": {
"field": "VALUE",
"type": "quantitative"
}
},
"mark": {
"type": "line"
}}
]
Throws an error to the effect of: Cannot read property 'push' of undefined
Meanwhile, the unit spec:
"encoding": {
"facet": {"field": "FEATURE_VALUE"},
"x": {
"field": "DATE",
"type": "temporal"
},
"y": {
"field": "VALUE",
"type": "quantitative"
}
},
"mark": {
"type": "line"
}
}
works just fine.
I can tell this has something to do with: Altair: Can't facet layered plots
However, can't quite seem to answer the principle question: can I have a trellis plot using facet as well as have layers on top of that (for say tooltips, rulers, etc.)
Thank you!
Vega-Lite provides two ways to specify facets: as an encoding (See Facet, Row, and Column Encoding Channels) and as an operator (See Facet Operator).
A layer chart is not allowed to contain a facet encoding, however a facet operator can contain a layer chart (the reason for this is that the semantics of layers containing incompatible facets is unclear).
So, instead of something like this:
"layer": [
{"encoding": {
"facet": {"field": "FEATURE_VALUE"},
"x": {
"field": "DATE",
"type": "temporal"
},
"y": {
"field": "VALUE",
"type": "quantitative"
}
},
"mark": {
"type": "line"
}}
]
you can do something like this:
"facet": {"field": "FEATURE_VALUE"},
"spec": {
"layer": [
{"encoding": {
"x": {
"field": "DATE",
"type": "temporal"
},
"y": {
"field": "VALUE",
"type": "quantitative"
}
},
"mark": {
"type": "line"
}}
]
}