How to link multiple plots with vega-lite only on horizontal axis?

Question

I have tested this: https://vega.github.io/editor/?#/url/vega-lite/N4IgJAzgxgFgpgWwIYgFwhgF0wBwqgegIDc4BzJAOjIEtMYBXAI0poHsDp5kTykBaADZ04JACyUAVhDYA7EABoQAEySYUqUAwBOgtCrVJOmNlADWESlAjEQAXyXEocqGrQBtUJm1JZEAGZs2ggeoP40gphw2vqqmAwIlBAAnghMbIIAvNkA5ACSAEIAsjn2ALpKyNpm+sKycIogcLLOyjSyZGigAB5dIOFwgsqxag1KmMk4DehRCDhBSHoOIMl9A0P6ONo0UGMgE1P6AI4Mvph0ajSk9ssQg3BQ53J92uTs8pr7k9Mg7VHaxEWjSY7WG6GgizgEBuDi8Pj8gWCoX6EX+I3iiRSaQy2UyOQA4gB5Qn40p2CogKo1dB1PbNVrtTqfXqfdZggxRRoHH6zeY+JZKVasmiDdlbHZ7bnHU6yc7qc7XOy3e6Pd4vN7PT5S9B-aKAvRKEGydkQwRQmEU14yQTXT6m6Y9fQQGBIV7DJV2IA

But without success since the vertical axis is also linked. Is there also a way to limit wheel zoom to one axis only ?

Answer 1

You can limit the scale binding to a single axis by specifying the "encodings" property of the selection. For example, this binds the selection only to the x-axis (view in vega editor):

{
  "$schema": "https://vega.github.io/schema/vega-lite/v4.json",
  "data": {"url": "data/stocks.csv"},
  "vconcat": [
    {
      "transform": [{"filter": "datum.symbol==='IBM'"}],
      "mark": "line",
      "encoding": {
        "x": {"field": "date", "type": "temporal"},
        "y": {"field": "price", "type": "quantitative"}
      },
      "selection": {
        "region": {"type": "interval", "bind": "scales", "encodings": ["x"]}
      }
    },
    {
      "transform": [{"filter": "datum.symbol==='GOOG'"}],
      "mark": "line",
      "encoding": {
        "x": {"field": "date", "type": "temporal"},
        "y": {"field": "price", "type": "quantitative"}
      },
      "selection": {
        "region": {"type": "interval", "bind": "scales", "encodings": ["x"]}
      }
    }
  ],
  "resolve": {"scale": {"x": "shared", "y": "independent"}}
}

If you want independent y scale binding in each chart, with a shared x-binding, you can do this by adding a new independent bound selection in each chart (vega editor):

{
  "$schema": "https://vega.github.io/schema/vega-lite/v4.json",
  "data": {"url": "data/stocks.csv"},
  "vconcat": [
    {
      "transform": [{"filter": "datum.symbol==='IBM'"}],
      "mark": "line",
      "encoding": {
        "x": {"field": "date", "type": "temporal"},
        "y": {"field": "price", "type": "quantitative"}
      },
      "selection": {
        "y_scroll_1": {"type": "interval", "bind": "scales", "encodings": ["y"]},
        "x_scroll": {"type": "interval", "bind": "scales", "encodings": ["x"]}
      }
    },
    {
      "transform": [{"filter": "datum.symbol==='GOOG'"}],
      "mark": "line",
      "encoding": {
        "x": {"field": "date", "type": "temporal"},
        "y": {"field": "price", "type": "quantitative"}
      },
      "selection": {
        "y_scroll_2": {"type": "interval", "bind": "scales", "encodings": ["y"]},
        "x_scroll": {"type": "interval", "bind": "scales", "encodings": ["x"]}
      }
    }
  ],
  "resolve": {"scale": {"x": "shared", "y": "independent"}}
}