# Milestones (Gantt example)

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

Zero-length tasks (or milestone: true) draw as diamonds and can be dependency targets.

- Chart type: `gantt` (Gantt)
- Collection: Gantt · Gantt
- Raw configuration: https://westcoast-charts.com/gallery-src/gantt/milestones.js
- Standalone example: https://westcoast-charts.com/embed/samples/wcc/gallery/premium/gantt/milestones.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: "auto",
    toolbar: {
      show: false
    },
    type: "gantt"
  },
  series: [
    {
      name: "Release train",
      data: [
        {
          id: "a",
          x: "Feature freeze",
          y: 1791496800000,
          milestone: true
        },
        {
          id: "b",
          x: "Stabilisation",
          y: [1791496800000, 1792447200000],
          progress: 70,
          dependsOn: ["a"]
        },
        {
          id: "c",
          x: "Release candidate",
          y: 1792533600000,
          milestone: true,
          dependsOn: ["b"]
        },
        {
          id: "d",
          x: "Beta feedback",
          y: [1792533600000, 1793314800000],
          progress: 10,
          dependsOn: ["c"]
        },
        {
          id: "e",
          x: "General availability",
          y: 1793574000000,
          milestone: true,
          dependsOn: ["d"]
        }
      ]
    }
  ],
  plotOptions: {
    gantt: {
      today: {
        date: "2026-10-22"
      }
    }
  },
  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 gantt-milestones.json --out gantt-milestones.svg --with-table` (save the options above as JSON first)