vega-extension.vg.json

{
  "$schema": "https://vega.github.io/schema/vega/v3.0.json",
  "description": "A simple bar chart with embedded data.",
  "autosize": "pad",
  "padding": 5,
  "height": 200,
  "style": "cell",
  "data": [
    {
      "name": "source_0",
      "values": [
        {
          "a": "A",
          "b": 28
        },
        {
          "a": "B",
          "b": 55
        },
        {
          "a": "C",
          "b": 43
        },
        {
          "a": "D",
          "b": 91
        },
        {
          "a": "E",
          "b": 81
        },
        {
          "a": "F",
          "b": 53
        },
        {
          "a": "G",
          "b": 19
        },
        {
          "a": "H",
          "b": 87
        },
        {
          "a": "I",
          "b": 52
        }
      ]
    },
    {
      "name": "data_0",
      "source": "source_0",
      "transform": [
        {
          "type": "formula",
          "expr": "toNumber(datum[\"b\"])",
          "as": "b"
        },
        {
          "type": "filter",
          "expr": "datum[\"b\"] !== null && !isNaN(datum[\"b\"])"
        }
      ]
    }
  ],
  "signals": [
    {
      "name": "x_step",
      "value": 21
    },
    {
      "name": "width",
      "update": "bandspace(domain('x').length, 0.1, 0.05) * x_step"
    }
  ],
  "marks": [
    {
      "name": "marks",
      "type": "rect",
      "style": ["bar"],
      "from": {
        "data": "data_0"
      },
      "encode": {
        "update": {
          "x": {
            "scale": "x",
            "field": "a"
          },
          "width": {
            "scale": "x",
            "band": true
          },
          "y": {
            "scale": "y",
            "field": "b"
          },
          "y2": {
            "scale": "y",
            "value": 0
          },
          "fill": {
            "value": "#4c78a8"
          }
        }
      }
    }
  ],
  "scales": [
    {
      "name": "x",
      "type": "band",
      "domain": {
        "data": "data_0",
        "field": "a",
        "sort": true
      },
      "range": {
        "step": {
          "signal": "x_step"
        }
      },
      "paddingInner": 0.1,
      "paddingOuter": 0.05
    },
    {
      "name": "y",
      "type": "linear",
      "domain": {
        "data": "data_0",
        "field": "b"
      },
      "range": [
        {
          "signal": "height"
        },
        0
      ],
      "nice": true,
      "zero": true
    }
  ],
  "axes": [
    {
      "scale": "x",
      "orient": "bottom",
      "labelOverlap": true,
      "title": "a",
      "zindex": 1,
      "encode": {
        "labels": {
          "update": {
            "angle": {
              "value": 270
            },
            "align": {
              "value": "right"
            },
            "baseline": {
              "value": "middle"
            }
          }
        }
      }
    },
    {
      "scale": "y",
      "orient": "left",
      "labelOverlap": true,
      "tickCount": {
        "signal": "ceil(height/40)"
      },
      "title": "b",
      "zindex": 1
    },
    {
      "scale": "y",
      "orient": "left",
      "domain": false,
      "grid": true,
      "labels": false,
      "maxExtent": 0,
      "minExtent": 0,
      "tickCount": {
        "signal": "ceil(height/40)"
      },
      "ticks": false,
      "zindex": 0,
      "gridScale": "x"
    }
  ],
  "config": {
    "axisY": {
      "minExtent": 30
    }
  }
}