Discretizing scales

Horizontally concatenated charts that show different types of discretizing scales

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Vega-Lite JSON Specification

{
  "$schema": "https://vega.github.io/schema/vega-lite/v3.json",
  "description": "Horizontally concatenated charts that show different types of discretizing scales.",
  "data": {
    "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}
    ]
  },
  "hconcat": [
    {
      "mark": "circle",
      "encoding": {
        "y": {
          "field": "b",
          "type": "nominal",
          "sort": null,
          "axis": {
            "ticks": false,
            "domain": false,
            "title": null
          }
        },
        "size": {
          "field": "b",
          "type": "quantitative",
          "scale": {
            "type": "quantize"
          }
        },
        "color": {
          "field": "b",
          "type": "quantitative",
          "scale": {
            "type": "quantize",
            "zero": true
          },
          "legend": {
            "title": "Quantize"
          }
        }
      }
    },
    {
      "mark": "circle",
      "encoding": {
        "y": {
          "field": "b",
          "type": "nominal",
          "sort": null,
          "axis": {
            "ticks": false,
            "domain": false,
            "title": null
          }
        },
        "size": {
          "field": "b",
          "type": "quantitative",
          "scale": {
            "type": "quantile",
            "range": [80, 160, 240, 320, 400]
          }
        },
        "color": {
          "field": "b",
          "type": "quantitative",
          "scale": {
            "type": "quantile",
            "scheme": "magma"
          },
          "legend": {
            "format": "d",
            "title": "Quantile"
          }
        }
      }
    },
    {
      "mark": "circle",
      "encoding": {
        "y": {
          "field": "b",
          "type": "nominal",
          "sort": null,
          "axis": {
            "ticks": false,
            "domain": false,
            "title": null
          }
        },
        "size": {
          "field": "b",
          "type": "quantitative",
          "scale": {
            "type": "threshold",
            "domain": [30, 70],
            "range": [80, 200, 320]
          }
        },
        "color": {
          "field": "b",
          "type": "quantitative",
          "scale": {
            "type": "threshold",
            "domain": [30, 70],
            "scheme": "viridis"
          },
          "legend": {
            "title": "Threshold"
          }
        }
      }
    }
  ],
  "resolve": {
    "scale": {
      "color": "independent",
      "size": "independent"
    }
  }
}