# `AspectRatio`

Width to height in whole numbers: `16:9`.

Use it for screens, images and video. `16:9` and `32:18` stay two different values. For a ratio of any two numbers, use [`Ratio`](/docs/types/type-ratio.md).

## Shape

| Field | Type | Required? |
|---|---|---|
| `width` | `Int` | Yes |
| `height` | `Int` | Yes |

## Example

```jadpo
AspectRatio { width: 16 height: 9 }
```

`text.parse(raw, as: AspectRatio)` reads one from text that comes from outside. Text that isn't one at all fails `malformed`, such as `16/9`, `1.85:1` or `0:1`.

## Good to know

- Decimals are refused, so `1.85:1` is written `185:100` here.
- `==` tells you whether two are the same. `<` and `list.sort_by` don't take it, so sort by one of its parts instead.

## In JSON

A string, in a request, a response or `json.write`:

```json
"16:9"
"4:3"
"1:1"
```

## Details

<details>
<summary>Text form, storage, how it is shown, and operations</summary>

`AspectRatio` is in the group Media and visual, and has been in Jadpo since 0.1.0.

### Text form

`text.from` writes one standard text form, the same form `text.parse` reads back: `16:9`, `4:3` and `1:1`.

### How it is stored

It is stored in 2 columns, each named for the field, `_` and its suffix. This is `1:1`:

| Column | Type | Holds |
|---|---|---|
| `<field>_width` | `integer` | `1` |
| `<field>_height` | `integer` | `1` |

### How it is shown to people

`text.format(value, locale:)` shows it to people in their locale.

With `locale: Locale.en_gb`:

| Value | Shown |
|---|---|
| `16:9` | `16:9` |
| `4:3` | `4:3` |
| `1:1` | `1:1` |
| `32:18` | `32:18` |
| `239:100` | `239:100` |

### Operations

It also takes `text.parse`, `text.from`, `text.format`, `json.read`, `json.write` and `==`. [How every standard type behaves](/docs/every-standard-type-meets-one-contract.md) says how they work.

</details>