area7.vl

{
    "transform": [
        {
            "groupby": [
                "Origin",
                "Cylinders"
            ],
            "aggregate": [
                {
                    "op": "count",
                    "as": "count_*"
                }
            ]
        },
        {
            "groupby": [],
            "as": [
                "stack_count_Origin1",
                "stack_count_Origin2"
            ],
            "offset": "normalize",
            "sort": [
                {
                    "field": "Origin",
                    "order": "ascending"
                }
            ],
            "stack": "count_*"
        },
        {
            "window": [
                {
                    "op": "min",
                    "as": "x",
                    "field": "stack_count_Origin1"
                },
                {
                    "op": "max",
                    "as": "x2",
                    "field": "stack_count_Origin2"
                },
                {
                    "op": "dense_rank",
                    "as": "rank_Cylinders"
                },
                {
                    "op": "distinct",
                    "as": "distinct_Cylinders",
                    "field": "Cylinders"
                }
            ],
            "groupby": [
                "Origin"
            ],
            "sort": [
                {
                    "field": "Cylinders",
                    "order": "ascending"
                }
            ],
            "frame": [
                null,
                null
            ]
        },
        {
            "window": [
                {
                    "op": "dense_rank",
                    "as": "rank_Origin"
                }
            ],
            "sort": [
                {
                    "field": "Origin",
                    "order": "ascending"
                }
            ],
            "frame": [
                null,
                null
            ]
        },
        {
            "groupby": [
                "Origin"
            ],
            "as": [
                "y",
                "y2"
            ],
            "offset": "normalize",
            "sort": [
                {
                    "field": "Cylinders",
                    "order": "ascending"
                }
            ],
            "stack": "count_*"
        },
        {
            "as": "ny",
            "calculate": "datum.y + (datum.rank_Cylinders - 1) * datum.distinct_Cylinders * 0.01 / 3"
        },
        {
            "as": "ny2",
            "calculate": "datum.y2 + (datum.rank_Cylinders - 1) * datum.distinct_Cylinders * 0.01 / 3"
        },
        {
            "as": "nx",
            "calculate": "datum.x + (datum.rank_Origin - 1) * 0.01"
        },
        {
            "as": "nx2",
            "calculate": "datum.x2 + (datum.rank_Origin - 1) * 0.01"
        },
        {
            "as": "xc",
            "calculate": "(datum.nx+datum.nx2)/2"
        },
        {
            "as": "yc",
            "calculate": "(datum.ny+datum.ny2)/2"
        }
    ],
    "config": {
        "concat": {
            "spacing": 10
        },
        "view": {
            "stroke": null
        },
        "axis": {
            "domain": false,
            "labels": false,
            "grid": false,
            "ticks": false
        }
    },
    "data": {
        "url": "https://vega.github.io/vega-lite/data/cars.json"
    },
    "resolve": {
        "scale": {
            "x": "shared"
        }
    },
    "vconcat": [
        {
            "mark": {
                "align": "center",
                "type": "text",
                "baseline": "middle"
            },
            "encoding": {
                "color": {
                    "field": "Origin",
                    "type": "nominal",
                    "legend": null
                },
                "text": {
                    "field": "Origin",
                    "type": "nominal"
                },
                "x": {
                    "field": "xc",
                    "aggregate": "min",
                    "title": "Origin",
                    "type": "quantitative",
                    "axis": {
                        "orient": "top"
                    }
                }
            }
        },
        {
            "layer": [
                {
                    "mark": "rect",
                    "encoding": {
                        "x2": {
                            "field": "nx2"
                        },
                        "color": {
                            "field": "Origin",
                            "type": "nominal",
                            "legend": null
                        },
                        "opacity": {
                            "field": "Cylinders",
                            "type": "quantitative",
                            "legend": null
                        },
                        "tooltip": [
                            {
                                "field": "Origin",
                                "type": "nominal"
                            },
                            {
                                "field": "Cylinders",
                                "type": "quantitative"
                            }
                        ],
                        "x": {
                            "field": "nx",
                            "type": "quantitative",
                            "axis": null
                        },
                        "y2": {
                            "field": "ny2"
                        },
                        "y": {
                            "field": "ny",
                            "type": "quantitative",
                            "axis": null
                        }
                    }
                },
                {
                    "mark": {
                        "type": "text",
                        "baseline": "middle"
                    },
                    "encoding": {
                        "text": {
                            "field": "Cylinders",
                            "type": "nominal"
                        },
                        "x": {
                            "field": "xc",
                            "type": "quantitative",
                            "axis": null
                        },
                        "y": {
                            "field": "yc",
                            "type": "quantitative",
                            "axis": {
                                "title": "Cylinders"
                            }
                        }
                    }
                }
            ]
        }
    ],
    "$schema": "https://vega.github.io/schema/vega-lite/v4.json"
}