Rectangular Brush

Drag out a rectangular brush to highlight points.

View this example in the online editor

Vega-Lite JSON Specification

{
  "$schema": "https://vega.github.io/schema/vega-lite/v3.json",
  "description": "Drag out a rectangular brush to highlight points.",
  "data": {"url": "data/cars.json"},
  "selection": {
    "brush": {
      "type": "interval",
      "init": {"x": [55, 160], "y": [13, 37]}
    }
  },
  "mark": "point",
  "encoding": {
    "x": {"field": "Horsepower", "type": "quantitative"},
    "y": {"field": "Miles_per_Gallon", "type": "quantitative"},
    "color": {
      "condition": {"selection": "brush", "field": "Cylinders", "type": "ordinal"},
      "value": "grey"
    }
  }
}