为什么在我的分层线图中使用垂直方向什么也不做？

Question

如果我在这里将horizontal更改为vertical，则轴不会切换：

{
  "$schema": "https://vega.github.io/schema/vega-lite/v5.json",
  "layer": [{
      "data": {"values": [
        {"x": 0.5, "y": 0},
        {"x": 1, "y": 1},
        {"x": 2, "y": 2}]},
      "mark": {"type": "line", "orient": "horizontal"},
      "encoding": {
        "x": {"field": "x", "type": "quantitative"},
        "y": {"field": "y", "type": "quantitative"},
        "color": {"datum": "a"}}
    }, {
      "data": {"values": [
        {"x": 1, "y": 0},
        {"x": 2, "y": 1},
        {"x": 2.5, "y": 2}]},
      "mark": {"type": "line", "orient": "horizontal"},
      "encoding": {
        "x": {"field": "x", "type": "quantitative"},
        "y": {"field": "y", "type": "quantitative"},
        "color": {"datum": "b"}}
    }
  ]
}

为什么会这样呢？如何使x轴和y轴转换位置？

Answer 1

还必须切换“编码”的"x“和"y”属性：

{
  "$schema": "https://vega.github.io/schema/vega-lite/v5.json",
  "layer": [{
      "data": {"values": [
        {"x": 0.5, "y": 0},
        {"x": 1, "y": 1},
        {"x": 2, "y": 2}]},
      "mark": {"type": "line", "orient": "vertical"},
      "encoding": {
        "x": {"field": "y", "type": "quantitative"},
        "y": {"field": "x", "type": "quantitative"},
        "color": {"datum": "a"}}
    }, {
      "data": {"values": [
        {"x": 1, "y": 0},
        {"x": 2, "y": 1},
        {"x": 2.5, "y": 2}]},
      "mark": {"type": "line", "orient": "vertical"},
      "encoding": {
        "x": {"field": "y", "type": "quantitative"},
        "y": {"field": "x", "type": "quantitative"},
        "color": {"datum": "b"}}
    }
  ]
}