# Data Update (Sankey example)

> WestCoast Charts 1.1.5, release, public Core release, on npm. HTML: https://westcoast-charts.com/gallery/sankey/data-update/ · Index for agents: https://westcoast-charts.com/llms.txt

New values every 2.5 s; nodes and links glide to their new size.

- Chart type: `sankey` (Sankey)
- Collection: Sankey · Sankey
- Raw configuration: https://westcoast-charts.com/gallery-src/sankey/data-update.js
- Standalone example: https://westcoast-charts.com/embed/samples/wcc/gallery/premium/sankey/data-update.html

## Setup

```js
import WestCoastCharts from 'west-coast-charts'
import types from 'west-coast-charts/types'
import premium from 'west-coast-charts/premium'

WestCoastCharts.use(types).use(premium)
const WestCoastChartsPremium = premium
WestCoastCharts.setLicenseKey(LICENCE_KEY) // paid production licence; localhost evaluation needs no key
```

## Options

```js
const options = {
  chart: {
    height: 400,
    toolbar: {
      show: false
    },
    type: "sankey"
  },
  series: [
    {
      data: [
        ["Solar", "Grid", 39],
        ["Wind", "Grid", 50],
        ["Gas", "Grid", 28],
        ["Nuclear", "Grid", 18],
        ["Grid", "Homes", 48],
        ["Grid", "Industry", 57],
        ["Grid", "Transport", 16],
        ["Grid", "Losses", 14]
      ]
    }
  ],
  plotOptions: {
    sankey: {
      link: {
        colorMode: "source"
      }
    }
  },
  theme: {
    mode: "light",
    preset: "coastal"
  }
}

const chart = new WestCoastCharts(document.querySelector('#chart'), options)
await chart.render()
```

## Verify

- Text check (Library 1.1.5): load `west-coast-charts/agent/describe` and call `chart.describe({ format: "json" })` for the actual drawn state. The live reader is on this example’s HTML page.
- Command line (Public agent tools 0.2.3, tested with Library 1.1.5; available from the versioned GitHub release and npm, https://westcoast-charts.com/docs/cli/index.md): `wcc chart export sankey-data-update.json --out sankey-data-update.svg --with-table` (save the options above as JSON first)