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Add interactive point selection examples to VegaLite guide (#2612)

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Co-authored-by: Jonatan Kłosko <jonatanklosko@gmail.com>
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Cristine Guadelupe 2024-12-04 19:46:09 +08:00 • committed by GitHub
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lib/livebook/notebook/learn/intro_to_vega_lite.livemd
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@ -998,6 +998,52 @@ Vl.new()
])
```
### Single point
Highlighting a single point by clicking on it.
```elixir
Vl.new(width: 400, height: 300)
|> Vl.data_from_url("https://vega.github.io/editor/data/cars.json")
|> Vl.param("pts", select: :point)
|> Vl.mark(:point)
|> Vl.encode_field(:x, "Horsepower", type: :quantitative)
|> Vl.encode_field(:y, "Miles_per_Gallon", type: :quantitative)
|> Vl.encode(:color,
condition: [
param: "pts",
field: "Cylinders",
type: :ordinal,
scale: [scheme: "yelloworangebrown"]
],
value: :gray
)
|> Vl.encode(:size, condition: [param: "pts", empty: false, value: 200], value: 50)
```
### Multiple points
Highlighting a group of matching points by clicking on one of them.
```elixir
Vl.new(width: 400, height: 300)
|> Vl.data_from_url("https://vega.github.io/editor/data/cars.json")
|> Vl.param("pts", select: [type: :point, fields: ["Cylinders"]])
|> Vl.mark(:point)
|> Vl.encode_field(:x, "Horsepower", type: :quantitative)
|> Vl.encode_field(:y, "Miles_per_Gallon", type: :quantitative)
|> Vl.encode(:color,
condition: [
param: "pts",
field: "Cylinders",
type: :ordinal,
scale: [scheme: "yelloworangebrown"]
],
value: :gray
)
|> Vl.encode(:size, condition: [param: "pts", empty: false, value: 200], value: 50)
```
### Map connections
An interactive visualization of connections between locations on a map.