使用 vega-lite 绘制两个 "columns" 具有两个不同数量级的数据
Plot two "columns" of data having two different orders of magnitude using vega-lite
(这是 的后续)
假设我的数据如下:
[
{"date": "2019-01-01", "foo": 10000, "bar": 10, "goo": 30},
{"date": "2019-01-02", "foo": 30000, "bar": 20, "goo": 20},
{"date": "2019-01-03", "foo": 40000, "bar": 20, "goo": 10},
{"date": "2019-01-04", "foo": 20000, "bar": 60, "goo": 20}
]
而我的情节是:
{
"$schema": "https://vega.github.io/schema/vega-lite/v3.json",
"description": "Stock prices of 5 Tech Companies over Time.",
"width": 1200,
"height": 450,
"data": { "url": "data.json" },
"mark": {
"type": "line",
"point": true
},
"transform": [
{ "fold": ["foo", "bar", "goo"] }
],
"encoding": {
"x": { "field": "date", "type": "temporal" },
"y": { "field": "value", "type": "quantitative" },
"color": { "field": "key", "type": "nominal" },
"scale": {"zero": false}
},
"resolve": { "scale": { "y": "independent" } }
}
如您所见,由于 foo
和其他两列的数量级不同,该图没有帮助。我怎样才能有一个次要的 y 轴和(在图例中提到它)?
您可以通过将分层与折叠变换相结合来做到这一点。以下是您可以如何修改示例 (vega editor link):
{
"$schema": "https://vega.github.io/schema/vega-lite/v3.json",
"width": 1200,
"height": 450,
"data": {
"values": [
{"date": "2019-01-01", "foo": 10000, "bar": 10, "goo": 30},
{"date": "2019-01-02", "foo": 30000, "bar": 20, "goo": 20},
{"date": "2019-01-03", "foo": 40000, "bar": 20, "goo": 10},
{"date": "2019-01-04", "foo": 20000, "bar": 60, "goo": 20}
]
},
"transform": [{"fold": ["foo", "bar", "goo"]}],
"encoding": {
"x": {"field": "date", "type": "temporal"},
"y": {"field": "value", "type": "quantitative"},
"color": {"field": "key", "type": "nominal"}
},
"layer": [
{
"mark": {"type": "line", "point": true},
"transform": [{"filter": "datum.key == 'foo'"}]
},
{
"mark": {"type": "line", "point": true},
"transform": [{"filter": "datum.key != 'foo'"}]
}
],
"resolve": {"scale": {"y": "independent"}}
}
然后您可以通过在每个层中指定 y 编码和标题来继续修改轴标题。这是一个例子(vega editor link):
{
"$schema": "https://vega.github.io/schema/vega-lite/v3.json",
"width": 1200,
"height": 450,
"data": {
"values": [
{"date": "2019-01-01", "foo": 10000, "bar": 10, "goo": 30},
{"date": "2019-01-02", "foo": 30000, "bar": 20, "goo": 20},
{"date": "2019-01-03", "foo": 40000, "bar": 20, "goo": 10},
{"date": "2019-01-04", "foo": 20000, "bar": 60, "goo": 20}
]
},
"transform": [{"fold": ["foo", "bar", "goo"]}],
"encoding": {
"x": {"field": "date", "type": "temporal"},
"color": {"field": "key", "type": "nominal"}
},
"layer": [
{
"mark": {"type": "line", "point": true},
"encoding": {
"y": {"field": "value", "type": "quantitative", "title": "Foo Value"}
},
"transform": [{"filter": "datum.key == 'foo'"}]
},
{
"mark": {"type": "line", "point": true},
"encoding": {
"y": {
"field": "value",
"type": "quantitative",
"title": "Bar/Goo Value"
}
},
"transform": [{"filter": "datum.key != 'foo'"}]
}
],
"resolve": {"scale": {"y": "independent"}}
}
(这是
假设我的数据如下:
[
{"date": "2019-01-01", "foo": 10000, "bar": 10, "goo": 30},
{"date": "2019-01-02", "foo": 30000, "bar": 20, "goo": 20},
{"date": "2019-01-03", "foo": 40000, "bar": 20, "goo": 10},
{"date": "2019-01-04", "foo": 20000, "bar": 60, "goo": 20}
]
而我的情节是:
{
"$schema": "https://vega.github.io/schema/vega-lite/v3.json",
"description": "Stock prices of 5 Tech Companies over Time.",
"width": 1200,
"height": 450,
"data": { "url": "data.json" },
"mark": {
"type": "line",
"point": true
},
"transform": [
{ "fold": ["foo", "bar", "goo"] }
],
"encoding": {
"x": { "field": "date", "type": "temporal" },
"y": { "field": "value", "type": "quantitative" },
"color": { "field": "key", "type": "nominal" },
"scale": {"zero": false}
},
"resolve": { "scale": { "y": "independent" } }
}
如您所见,由于 foo
和其他两列的数量级不同,该图没有帮助。我怎样才能有一个次要的 y 轴和(在图例中提到它)?
您可以通过将分层与折叠变换相结合来做到这一点。以下是您可以如何修改示例 (vega editor link):
{
"$schema": "https://vega.github.io/schema/vega-lite/v3.json",
"width": 1200,
"height": 450,
"data": {
"values": [
{"date": "2019-01-01", "foo": 10000, "bar": 10, "goo": 30},
{"date": "2019-01-02", "foo": 30000, "bar": 20, "goo": 20},
{"date": "2019-01-03", "foo": 40000, "bar": 20, "goo": 10},
{"date": "2019-01-04", "foo": 20000, "bar": 60, "goo": 20}
]
},
"transform": [{"fold": ["foo", "bar", "goo"]}],
"encoding": {
"x": {"field": "date", "type": "temporal"},
"y": {"field": "value", "type": "quantitative"},
"color": {"field": "key", "type": "nominal"}
},
"layer": [
{
"mark": {"type": "line", "point": true},
"transform": [{"filter": "datum.key == 'foo'"}]
},
{
"mark": {"type": "line", "point": true},
"transform": [{"filter": "datum.key != 'foo'"}]
}
],
"resolve": {"scale": {"y": "independent"}}
}
然后您可以通过在每个层中指定 y 编码和标题来继续修改轴标题。这是一个例子(vega editor link):
{
"$schema": "https://vega.github.io/schema/vega-lite/v3.json",
"width": 1200,
"height": 450,
"data": {
"values": [
{"date": "2019-01-01", "foo": 10000, "bar": 10, "goo": 30},
{"date": "2019-01-02", "foo": 30000, "bar": 20, "goo": 20},
{"date": "2019-01-03", "foo": 40000, "bar": 20, "goo": 10},
{"date": "2019-01-04", "foo": 20000, "bar": 60, "goo": 20}
]
},
"transform": [{"fold": ["foo", "bar", "goo"]}],
"encoding": {
"x": {"field": "date", "type": "temporal"},
"color": {"field": "key", "type": "nominal"}
},
"layer": [
{
"mark": {"type": "line", "point": true},
"encoding": {
"y": {"field": "value", "type": "quantitative", "title": "Foo Value"}
},
"transform": [{"filter": "datum.key == 'foo'"}]
},
{
"mark": {"type": "line", "point": true},
"encoding": {
"y": {
"field": "value",
"type": "quantitative",
"title": "Bar/Goo Value"
}
},
"transform": [{"filter": "datum.key != 'foo'"}]
}
],
"resolve": {"scale": {"y": "independent"}}
}