# Split Tasks (Gantt example)

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

Tasks interrupted by a holiday freeze, drawn as parts joined through the pause (segments: [[start, end], ...]); progress fills the working time, durations count working parts only, and dragging moves all parts. Below 960 px the grid switches to a task/progress summary; all task data are retained. Use a wider view for the full columns.

- Chart type: `gantt` (Gantt)
- Collection: Gantt · Gantt
- Raw configuration: https://westcoast-charts.com/gallery-src/gantt/split-tasks.js
- Standalone example: https://westcoast-charts.com/embed/samples/wcc/gallery/premium/gantt/split-tasks.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 = {
  "responsive": [
    {
      "breakpoint": 960,
      "options": {
        "plotOptions": {
          "gantt": {
            "grid": {
              "width": 180,
              "columns": [
                {
                  "key": "name",
                  "header": "Task / progress",
                  "value": (_raw, { task }) => (Number.isFinite(task.progress) ? Math.round(task.progress) + '% · ' : '') + task.name
                }
              ]
            }
          }
        }
      }
    }
  ],
  "chart": {
    "height": "auto",
    "toolbar": {
      "show": false
    },
    "type": "gantt"
  },
  "series": [
    {
      "name": "Audit",
      "data": [
        {
          "id": "p",
          "x": "Preparation",
          "y": [
            1796079600000,
            1796684400000
          ],
          "progress": 100
        },
        {
          "id": "f",
          "x": "Field work",
          "segments": [
            [
              1796684400000,
              1797634800000
            ],
            [
              1799103600000,
              1799881200000
            ]
          ],
          "progress": 60,
          "dependsOn": [
            "p"
          ]
        },
        {
          "id": "q",
          "x": "Interviews",
          "segments": [
            [
              1796857200000,
              1797289200000
            ],
            [
              1797462000000,
              1797634800000
            ],
            [
              1799276400000,
              1799708400000
            ]
          ],
          "progress": 35,
          "dependsOn": [
            {
              "id": "f",
              "type": "SS",
              "lag": 2
            }
          ]
        },
        {
          "id": "r",
          "x": "Report",
          "y": [
            1799881200000,
            1800572400000
          ],
          "dependsOn": [
            "f",
            "q"
          ]
        }
      ]
    }
  ],
  "plotOptions": {
    "gantt": {
      "today": {
        "show": false
      },
      "drag": {
        "enabled": true
      },
      "grid": {
        "width": 310,
        "columns": [
          "name",
          {
            "key": "start",
            "width": 64
          },
          {
            "key": "duration",
            "width": 48
          }
        ]
      }
    }
  },
  "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-split-tasks.json --out gantt-split-tasks.svg --with-table` (save the options above as JSON first)