{
  "$schema": "https://vega.github.io/schema/vega/v5.json",
  "description": "A wheat plot example, which combines elements of dot plots and histograms.",
  "width": 500,
  "padding": 5,

  "signals": [
    { "name": "symbolDiameter", "value": 4,
      "bind": {"input": "range", "min": 1, "max": 8, "step": 0.25} },
    { "name": "binOffset", "value": 0,
      "bind": {"input": "range", "min": -0.1, "max": 0.1} },
    { "name": "binStep", "value": 0.075,
      "bind": {"input": "range", "min": 0.001, "max": 0.2, "step": 0.001} },
    { "name": "height", "update": "extent[1] * (1 + symbolDiameter)" }
  ],

  "data": [
    {
      "name": "points",
      "url": "data/normal-2d.json",
      "transform": [
        {
          "type": "bin", "field": "u",
          "extent": [-1, 1],
          "anchor": {"signal": "binOffset"},
          "step": {"signal": "binStep"},
          "nice": false,
          "signal": "bins"
        },
        {
          "type": "stack",
          "groupby": ["bin0"],
          "sort": {"field": "u"}
        },
        {
          "type": "extent", "signal": "extent",
          "field": "y1"
        }
      ]
    }
  ],

  "scales": [
    {
      "name": "xscale",
      "type": "linear",
      "range": "width",
      "domain": [-1, 1]
    },
    {
      "name": "yscale",
      "type": "linear",
      "range": "height",
      "domain": [0, {"signal": "extent[1]"}]
    }
  ],

  "axes": [
    { "orient": "bottom", "scale": "xscale",
      "values": {"signal": "sequence(bins.start, bins.stop + bins.step, bins.step)"},
      "domain": false, "ticks": false, "labels": false, "grid": true,
      "zindex": 0 },
    {"orient": "bottom", "scale": "xscale", "zindex": 1}
  ],

  "marks": [
    {
      "type": "symbol",
      "from": {"data": "points"},
      "encode": {
        "enter": {
          "fill": {"value": "transparent"},
          "strokeWidth": {"value": 0.5}
        },
        "update": {
          "x": {"scale": "xscale", "field": "u"},
          "y": {"scale": "yscale", "field": "y0"},
          "size": {"signal": "symbolDiameter * symbolDiameter"},
          "stroke": {"value": "steelblue"}
        },
        "hover": {
          "stroke": {"value": "firebrick"}
        }
      }
    }
  ]
}
