interaction4.vl

{
    "$schema": "https://vega.github.io/schema/vega-lite/v4.json",
    "data": {
        "url": "https://vega.github.io/vega-lite/data/unemployment-across-industries.json"
    },
    "description": "Area chart with rectangular brush",
    "encoding": {
        "x": {
            "field": "date",
            "timeUnit": "yearmonth",
            "type": "temporal"
        },
        "y": {
            "aggregate": "sum",
            "field": "count",
            "type": "quantitative"
        }
    },
    "layer": [
        {
            "mark": "area",
            "selection": {
                "myBrush": {
                    "encodings": [
                        "x"
                    ],
                    "type": "interval"
                }
            }
        },
        {
            "mark": {
                "color": "goldenrod",
                "type": "area"
            },
            "transform": [
                {
                    "filter": {
                        "selection": "myBrush"
                    }
                }
            ]
        }
    ]
}