# Spectrum ring (Radial Column example)

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

120 thin bars around a full ring, coloured cyan to orange by angle; the centre shows the total.

- Chart type: `radialColumn` (Radial Column)
- Collection: Radial Column · Radial Column · Ring & inner layers
- Raw configuration: https://westcoast-charts.com/gallery-src/radial-column/spectrum.js
- Standalone example: https://westcoast-charts.com/embed/samples/wcc/premium/radial-column.html?only=spectrum

## Setup

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

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

## Options

```js
const options = {
  "chart": {
    "type": "radialColumn",
    "height": 480,
    "toolbar": {
      "show": false
    }
  },
  "series": [
    {
      "name": "Requests",
      "data": [
        57,
        56,
        58,
        57,
        57,
        54,
        50,
        44,
        43,
        38,
        35,
        35,
        36,
        35,
        37,
        38,
        39,
        44,
        43,
        49,
        54,
        54,
        59,
        65,
        69,
        74,
        76,
        79,
        82,
        87,
        89,
        87,
        90,
        90,
        86,
        84,
        79,
        79,
        79,
        74,
        74,
        68,
        66,
        62,
        57,
        52,
        46,
        44,
        42,
        39,
        35,
        34,
        36,
        37,
        35,
        39,
        38,
        38,
        42,
        49,
        53,
        55,
        55,
        55,
        60,
        63,
        67,
        72,
        75,
        75,
        79,
        81,
        85,
        82,
        81,
        79,
        79,
        76,
        75,
        73,
        73,
        73,
        66,
        62,
        61,
        52,
        51,
        49,
        44,
        43,
        39,
        39,
        38,
        39,
        39,
        41,
        38,
        38,
        45,
        50,
        51,
        53,
        55,
        62,
        66,
        67,
        72,
        73,
        76,
        79,
        78,
        82,
        85,
        87,
        85,
        87,
        85,
        79,
        79,
        79
      ]
    }
  ],
  "xaxis": {
    "categories": [
      "00:00",
      "00:12",
      "00:24",
      "00:36",
      "00:48",
      "01:00",
      "01:12",
      "01:24",
      "01:36",
      "01:48",
      "02:00",
      "02:12",
      "02:24",
      "02:36",
      "02:48",
      "03:00",
      "03:12",
      "03:24",
      "03:36",
      "03:48",
      "04:00",
      "04:12",
      "04:24",
      "04:36",
      "04:48",
      "05:00",
      "05:12",
      "05:24",
      "05:36",
      "05:48",
      "06:00",
      "06:12",
      "06:24",
      "06:36",
      "06:48",
      "07:00",
      "07:12",
      "07:24",
      "07:36",
      "07:48",
      "08:00",
      "08:12",
      "08:24",
      "08:36",
      "08:48",
      "09:00",
      "09:12",
      "09:24",
      "09:36",
      "09:48",
      "10:00",
      "10:12",
      "10:24",
      "10:36",
      "10:48",
      "11:00",
      "11:12",
      "11:24",
      "11:36",
      "11:48",
      "12:00",
      "12:12",
      "12:24",
      "12:36",
      "12:48",
      "13:00",
      "13:12",
      "13:24",
      "13:36",
      "13:48",
      "14:00",
      "14:12",
      "14:24",
      "14:36",
      "14:48",
      "15:00",
      "15:12",
      "15:24",
      "15:36",
      "15:48",
      "16:00",
      "16:12",
      "16:24",
      "16:36",
      "16:48",
      "17:00",
      "17:12",
      "17:24",
      "17:36",
      "17:48",
      "18:00",
      "18:12",
      "18:24",
      "18:36",
      "18:48",
      "19:00",
      "19:12",
      "19:24",
      "19:36",
      "19:48",
      "20:00",
      "20:12",
      "20:24",
      "20:36",
      "20:48",
      "21:00",
      "21:12",
      "21:24",
      "21:36",
      "21:48",
      "22:00",
      "22:12",
      "22:24",
      "22:36",
      "22:48",
      "23:00",
      "23:12",
      "23:24",
      "23:36",
      "23:48"
    ]
  },
  "plotOptions": {
    "radialColumn": {
      "center": {
        "label": "Requests today"
      }
    }
  }
}

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 radial-column-spectrum.json --out radial-column-spectrum.svg --with-table` (save the options above as JSON first)