{
  "$schema": "https://vega.github.io/schema/vega/v5.json",
  "width": 400,
  "height": 300,
  "padding": 5,
  "autosize": {"type": "pad", "resize": true},

  "signals": [
    {
      "name": "maxbins", "value": 10,
      "bind": {"input": "select", "options": [5, 10, 20, 50]}
    },
    {
      "name": "binDomain",
      "update": "[bins.start, bins.stop]"
    }
  ],

  "data": [
    {
      "name": "table",
      "values": [
        {"v": 28}, {"v": 55}, {"v": 43}, {"v": 91}, {"v": 34},
        {"v": 81}, {"v": 53}, {"v": 19}, {"v": 87}, {"v": 38},
        {"v": 52}, {"v": 48}, {"v": 24}, {"v": 49},
        {"v": 87}, {"v": 66}, {"v": 17}, {"v": 27},
        {"v": 68}, {"v": 12}, {"v": 49}, {"v":  4}
      ],
      "transform": [
        {
          "type": "extent", "field": "v",
          "signal": "extent"
        },
        {
          "type": "bin", "signal": "bins",
          "field": "v", "extent": {"signal": "extent"},
          "maxbins": {"signal": "maxbins"}
        }
      ]
    },
    {
      "name": "counts",
      "source": "table",
      "transform": [
        {
          "type": "aggregate",
          "groupby": ["bin0", "bin1"]
        }
      ]
    }
  ],

  "scales": [
    {
      "name": "yscale",
      "type": "linear",
      "range": "height",
      "domain": {"data": "counts", "field": "count"}
    },
    {
      "name": "xscale",
      "type": "linear",
      "range": "width",
      "round": true,
      "domain": {"signal": "binDomain"},
      "bins": {"signal": "bins"}
    },
    {
      "name": "size",
      "type": "linear",
      "range": [10, 100],
      "round": true,
      "domain": {"signal": "binDomain"},
      "bins": {"signal": "bins"}
    },
    {
      "name": "color",
      "type": "bin-ordinal",
      "range": {"scheme": "purpleorange"},
      "bins": {
        "start": {"signal": "bins.start"},
        "stop": {"signal": "bins.stop"},
        "step": {"signal": "bins.step"}
      }
    }
  ],

  "axes": [
    {"orient": "bottom", "scale": "xscale", "tickCount": 20, "labelOverlap": true, "zindex": 1},
    {"orient": "left", "scale": "yscale", "tickCount": 5, "zindex": 1}
  ],

  "legends": [
    {"fill": "color", "size": "size", "title": "Bins"}
  ],

  "marks": [
    {
      "type": "rect",
      "from": {"data": "counts"},
      "encode": {
        "enter": {
          "x": {"scale": "xscale", "field": "bin0", "offset": 1},
          "x2": {"scale": "xscale", "field": "bin1"},
          "y": {"scale": "yscale", "field": "count"},
          "y2": {"scale": "yscale", "value": 0}
        },
        "update": {
          "fill": {"scale": "color", "field": "bin0"}
        }
      }
    }
  ]
}
