mcnuttandrew/.block

## .block
license: bsd-3-clause

## README.md

      
    Raw
  

              README.md
            
          
    Vega-lite example

Categorical Bar Chart from Columns

Sometimes you have data structured as a collection of columns in a table and you want to be able to draw a bar chart with each column getting it's own bar. This is an example of how to do that.

  
## bar.vl.json
{
  "$schema": "https://vega.github.io/schema/vega-lite/v3.json",
  "description": "A simple bar chart with embedded data.",
  "width": 360,
  "data": {
    "values": [
      {"a": 1, "b": 2, "c": 3},
      {"a": 2, "b": 4, "c": 9},
      {"a": 3, "b": 8, "c": 27},
      {"a": 4, "b": 16, "c": 81}
    ]
  },
  "transform": [
    {"fold": ["a", "b", "c"]}
  ],
  "mark": "bar",
  "encoding": {
    "x": {"field": "key", "type": "ordinal"},
    "y": {"field": "value", "type": "quantitative", "aggregate": "mean"},
    "tooltip": {"field": "b", "type": "quantitative"}
  }
}

## index.html
<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://cdn.jsdelivr.net/npm/vega@5"></script>
	<script src="https://cdn.jsdelivr.net/npm/vega-lite@3"></script>
	<script src="https://cdn.jsdelivr.net/npm/vega-embed@4"></script>
</head>

<body>
  <div id="vis"></div>

  <script>
    const spec = "bar.vl.json";
  	vegaEmbed('#vis', spec)
    	// result.view provides access to the Vega View API
      .then(result => console.log(result))
      .catch(console.warn);
  </script>
</body>
	{
	"$schema": "https://vega.github.io/schema/vega-lite/v3.json",
	"description": "A simple bar chart with embedded data.",
	"width": 360,
	"data": {
	"values": [
	{"a": 1, "b": 2, "c": 3},
	{"a": 2, "b": 4, "c": 9},
	{"a": 3, "b": 8, "c": 27},
	{"a": 4, "b": 16, "c": 81}
	]
	},
	"transform": [
	{"fold": ["a", "b", "c"]}
	],
	"mark": "bar",
	"encoding": {
	"x": {"field": "key", "type": "ordinal"},
	"y": {"field": "value", "type": "quantitative", "aggregate": "mean"},
	"tooltip": {"field": "b", "type": "quantitative"}
	}
	}
	<!DOCTYPE html>
	<head>
	<meta charset="utf-8">
	<script src="https://cdn.jsdelivr.net/npm/vega@5"></script>
	<script src="https://cdn.jsdelivr.net/npm/vega-lite@3"></script>
	<script src="https://cdn.jsdelivr.net/npm/vega-embed@4"></script>
	</head>

	<body>
	<div id="vis"></div>

	<script>
	const spec = "bar.vl.json";
	vegaEmbed('#vis', spec)
	// result.view provides access to the Vega View API
	.then(result => console.log(result))
	.catch(console.warn);
	</script>
	</body>