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December 18, 2020 05:48
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This is the 2020-12-17 iteration of a demo Vega-Lite spec I'm working on for an experimental Power BI visual - currently codenamed "Deneb". Authors can add measures and columns to the visual, which generates a flat table dataset. This is bound to Vega and Vega-Lite as a named dataset, which the author can than use to generate their own visuals.
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| { | |
| "$schema": "https://vega.github.io/schema/vega-lite/v4.json", | |
| "data": { | |
| "name": "values" | |
| }, | |
| "config": { | |
| "autosize": { | |
| "type": "fit", | |
| "contains": "padding" | |
| }, | |
| "mark": { | |
| "tooltip": true | |
| }, | |
| "axis": { | |
| "domain": false, | |
| "labelColor": "#605E5C", | |
| "labelFontSize": 12, | |
| "labelPadding": 5, | |
| "ticks": false, | |
| "tickCount": 5, | |
| "titleFontSize": 16, | |
| "titleFontWeight": "bold", | |
| "titleColor": "#605E5C" | |
| }, | |
| "text": { | |
| "baseline": "bottom", | |
| "color": "#605E5C", | |
| "align": "center", | |
| "dx": -2, | |
| "dy": -2, | |
| "y": 0, | |
| "fontSize": 10 | |
| }, | |
| "rule": { | |
| "size": 2, | |
| "color": "#484644" | |
| } | |
| }, | |
| "layer": [ | |
| { | |
| "transform": [ | |
| { | |
| "density": "Mean Temperature", | |
| "bandwidth": 0.3 | |
| } | |
| ], | |
| "mark": { | |
| "type": "area", | |
| "line": { | |
| "color": "#666666", | |
| "size": 0 | |
| }, | |
| "color": { | |
| "x1": 0, | |
| "y1": 1, | |
| "x2": 1, | |
| "y2": 1, | |
| "gradient": "linear", | |
| "stops": [ | |
| { | |
| "offset": 0, | |
| "color": "#2f78b3" | |
| }, | |
| { | |
| "offset": 1, | |
| "color": "#c5690d" | |
| } | |
| ] | |
| } | |
| }, | |
| "encoding": { | |
| "x": { | |
| "field": "value", | |
| "title": "Temperature (°C)", | |
| "type": "quantitative" | |
| }, | |
| "y": { | |
| "field": "density", | |
| "type": "quantitative", | |
| "title": "Density", | |
| "axis": { | |
| "format": ".0%" | |
| } | |
| } | |
| } | |
| }, | |
| { | |
| "description": "Median", | |
| "layer": [ | |
| { | |
| "mark": "rule", | |
| "encoding": { | |
| "x": { | |
| "aggregate": "median", | |
| "field": "Mean Temperature" | |
| } | |
| } | |
| }, | |
| { | |
| "mark": { | |
| "type": "text", | |
| "text": "Median" | |
| }, | |
| "encoding": { | |
| "x": { | |
| "aggregate": "median", | |
| "field": "Mean Temperature" | |
| } | |
| } | |
| } | |
| ] | |
| }, | |
| { | |
| "layer": [ | |
| { | |
| "description": "Lower Quartile", | |
| "mark": { | |
| "type": "rule", | |
| "strokeDash": [ | |
| 4, | |
| 4 | |
| ] | |
| }, | |
| "encoding": { | |
| "x": { | |
| "aggregate": "q1", | |
| "field": "Mean Temperature" | |
| } | |
| } | |
| }, | |
| { | |
| "mark": { | |
| "type": "text", | |
| "text": "Q1" | |
| }, | |
| "encoding": { | |
| "x": { | |
| "aggregate": "q1", | |
| "field": "Mean Temperature" | |
| } | |
| } | |
| } | |
| ] | |
| }, | |
| { | |
| "layer": [ | |
| { | |
| "description": "Upper Quartile", | |
| "mark": { | |
| "type": "rule", | |
| "strokeDash": [ | |
| 4, | |
| 4 | |
| ] | |
| }, | |
| "encoding": { | |
| "x": { | |
| "aggregate": "q3", | |
| "field": "Mean Temperature" | |
| } | |
| } | |
| }, | |
| { | |
| "mark": { | |
| "type": "text", | |
| "text": "Q3" | |
| }, | |
| "encoding": { | |
| "x": { | |
| "aggregate": "q3", | |
| "field": "Mean Temperature" | |
| } | |
| } | |
| } | |
| ] | |
| } | |
| ] | |
| } |
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Example showing the measure (Mean Temperature) and column added to the visual. The Sample column is used to ensure the grain of the data is correct for the Mean Temperature measure:
Putting the visual into focus mode (in Desktop, or if the report is in Edit mode in the Service), the author has access to the spec editor: