织女星:如何为多层散点图显示多个“色彩”传说？

Question

我的织女星json：在Vega编辑器中打开图表

{
  "$schema": "https://vega.github.io/schema/vega-lite/v5.json",
  "layer": [
    {
      "data": {"url": "data/cars.json"},
      "params": [
        {
          "name": "grid",
          "select": "interval",
          "bind": "scales"
        }
      ],
      "mark": "circle",
      "encoding": {
        "x": {"field": "Horsepower", "type": "quantitative"},
        "y": {"field": "Miles_per_Gallon", "type": "quantitative"},
        "color": {
          "field": "Horsepower",
          "type": "quantitative",
          "scale": {
            "range": ["blue", "blue"]
          }
        }
      }
    },


    {
      "data": {"url": "data/cars.json"},
      "mark": "circle",
      "encoding": {
        "x": {"field": "Miles_per_Gallon", "type": "quantitative"},
        "y": {"field": "Acceleration", "type": "quantitative"},
        "color": {
          "field": "Displacement",
          "type": "quantitative",
          "scale": {
            "range": ["black", "black"]
          }
        }
      }
    }
  ]
}

我正在显示2层scratter图，所以我希望它有两个传奇色条。当我使用“颜色”时，第二个图例被合并，并被第一个图例所取代。

当我改变使用“填充”，我设法有两个不同的颜色条。但是如果我有4层，该怎么做呢？

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Answer 1

您需要添加resolve属性。

 "resolve": {"legend":{"color": "independent"}, "scale": {"color": "independent"} }

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vega编辑器上的示例：在Vega编辑器中打开图表