VEGA-LITE is a high-level visualization grammar. It provides a concise JSON syntax for supporting rapid generation of visualizations to support analysis. Vega-Lite support interactive multi-view graphics. Specifications can be compiled to Vega.
To begin creating visualizations with Vega-Lite, you need to have it installed. You can install it via npm:
npm install vega-lite
Alternatively, you can include Vega-Lite via a script tag in your HTML file:
<script src="https://cdn.jsdelivr.net/npm/vega@{VERSION}"></script>
<script src="https://cdn.jsdelivr.net/npm/vega-lite@{VERSION}"></script>
<script src="https://cdn.jsdelivr.net/npm/vega-embed@{VERSION}"></script>
Replace {VERSION} with the desired version number.
Let’s create a simple bar chart using Vega-Lite. We’ll start by defining our data and then specifying the chart properties:
{
"$schema": "https://vega.github.io/schema/vega-lite/v5.json",
"description": "A simple bar chart with embedded data.",
"data": {
"values": [
{"a": "A", "b": 28},
{"a": "B", "b": 55},
{"a": "C", "b": 43}
]
},
"mark": "bar",
"encoding": {
"x": {"field": "a", "type": "ordinal"},
"y": {"field": "b", "type": "quantitative"}
}
}
$schema: Specifies the version of Vega-Lite schema.description: A description of the chart.data: Specifies the data used for visualization.mark: Specifies the type of chart (e.g., bar, line, point).encoding: Defines how data attributes are mapped to visual properties (e.g., x-axis, y-axis).You can display the chart using various methods such as embedding it in a webpage or using Vega-Embed in an HTML file:
<div id="vis"></div>
<script>
var spec = {...}; // Replace {...} with the Vega-Lite specification
vegaEmbed('#vis', spec);
</script>
Conclusion In this tutorial, you’ve learned the basics of creating visualizations with Vega-Lite. Experiment with different chart types, data formats, and configurations to create compelling visualizations for your data analysis needs. Visit the Vega-Lite documentation for more detailed information and examples.