# With Changing Lines

`POST https://api.astroway.info/v1/iching/with-changing-lines`

Primary + transformed hexagrams.

Group: I Ching (Standalone). Auth: `X-Api-Key` header. Operation ID: `iching_with-changing-lines`.

## Parameters

| Name | In | Required | Type | Description |
|---|---|---|---|---|
| `fields` | query | no | string | Comma-separated dotted paths, relative to `data`, to keep in the response. A path is applied to every element of an array, so `planets.name` means the name of each planet. Paths that match nothing come back in `_fields_unmatched`; a list where nothing matches at all is a 400, because an empty object would be a confident wrong answer. |
| `precision` | query | no | integer | Round every non-integer number in the response to this many decimal places. Integers are left alone, because an id is not a measurement. Ecliptic longitudes ship with fourteen decimals by default; 2 is about a tenth of an arcminute. |

## Request body

| Field | Type | Required | Description |
|---|---|---|---|
| `seed` | number \| string | no |  |

```json
{
  "seed": "..."
}
```

## Responses

| Status | Meaning |
|---|---|
| 200 | Successful calculation |
| 400 | Validation error |
| 401 | Missing or invalid API key |

### Success fields, under `data`

| Field | Type | Required | Description |
|---|---|---|---|
| `seed` | number | no |  |
| `primary` | object | no |  |
| `primary.number` | number | no |  |
| `primary.name` | string | no |  |
| `primary.chinese` | string | no |  |
| `primary.trigrams` | number[] | no |  |
| `primary.lines` | object[] | no |  |
| `primary.changingHexagram` | number | no |  |
| `changingLines` | number[] | no |  |
| `transformedHexagram` | object | no |  |
| `transformedHexagram.number` | number | no |  |
| `transformedHexagram.name` | string | no |  |
| `transformedHexagram.chinese` | string | no |  |
| `transformedHexagram.trigrams` | number[] | no |  |
| `transformedHexagram.lines` | object[] | no |  |
| `note` | string | no |  |
| `source` | string | no |  |

## Example

```bash
curl -X POST https://api.astroway.info/v1/iching/with-changing-lines \
  -H "X-Api-Key: aw_live_..." \
  -H "Content-Type: application/json" \
  -d '{ "seed": "..." }'
```

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Rendered from https://api.astroway.info/v1/openapi.json. HTML page: https://api.astroway.info/docs/api/operations/iching_with-changing-lines/