# LinearArcDisplay

Auto-generated config schema for the current JBrowse release — see the
[config guide](https://jbrowse.org/jb2-staging/docs/config_guide) for concepts. Provided by the `arc` plugin.
[View source](https://github.com/GMOD/jbrowse-components/blob/main/plugins/arc/src/LinearArcDisplay/configSchema.ts).

## Example usage

Selected on a `FeatureTrack`; each feature is drawn as one arc from its start to
its end. `displayMode` is `arcs` (bezier) or `semicircles`. The `thickness` and
`label` slots default to expressions over the feature `score`, so override them
(plus `color` / `arcHeight`) for data without a score. All style slots are
jexl-evaluated per feature:

```js
{
  type: 'FeatureTrack',
  trackId: 'interactions',
  name: 'Interactions',
  assemblyNames: ['hg38'],
  adapter: {
    type: 'Gff3TabixAdapter',
    uri: 'https://example.com/interactions.gff3.gz',
  },
  displays: [
    {
      type: 'LinearArcDisplay',
      displayId: 'interactions-LinearArcDisplay',
      displayMode: 'semicircles',
      color: "jexl:feature.strand==-1?'red':'blue'",
      arcHeight: 80,
      label: "jexl:feature.name",
    },
  ],
}
```

_See the **Config slots** section below for all available configuration fields._

## Related links

- **Adapter:** [BedAdapter](../bedadapter)
- **Adapter:** [BedTabixAdapter](../bedtabixadapter)
- **Adapter:** [BigBedAdapter](../bigbedadapter)
- **Adapter:** [CrisprGuideAdapter](../crisprguideadapter)
- **Adapter:** [FromConfigAdapter](../fromconfigadapter)
- **Adapter:** [Gff3Adapter](../gff3adapter)
- **Adapter:** [Gff3TabixAdapter](../gff3tabixadapter)
- **Adapter:** [GtfAdapter](../gtfadapter)
- **Adapter:** [GtfTabixAdapter](../gtftabixadapter)
- **Adapter:** [NCListAdapter](../nclistadapter)
- **Adapter:** [SequenceSearchAdapter](../sequencesearchadapter)
- **Adapter:** [SPARQLAdapter](../sparqladapter)
- **State model:** [runtime API](../../models/lineararcdisplay)
- **Base config:** [BaseLinearDisplay](../baselineardisplay)

## Config slots

These slots go on a display entry:
`"displays": [{ "type": "LinearArcDisplay", ... }]`, or in the track's
[`displayDefaults`](https://jbrowse.org/jb2-staging/docs/config_guides/tracks#configuring-displays) when this
is its default display. Slot types (`fileLocation`, `frozen`, ...) are explained
in the [config slot types reference](https://jbrowse.org/jb2-staging/docs/config_guides/slot_types). Slots a
base configuration contributes are listed here too, so this table is the whole
surface.

<!-- prettier-ignore -->
| Slot | Description |
| --- | --- |
| <span id="slot-color">**color**</span><br>[`color`](https://jbrowse.org/jb2-staging/docs/config_guides/slot_types#color) = <code>'darkblue'</code> | the color of the arcs<br>_callback args:_ `feature` |
| <span id="slot-thickness">**thickness**</span><br>[`number`](https://jbrowse.org/jb2-staging/docs/config_guides/slot_types#number) = <code>'jexl:logThickness(feature,'score')'</code> | the thickness of the arcs<br>_callback args:_ `feature` |
| <span id="slot-label">**label**</span><br>[`string`](https://jbrowse.org/jb2-staging/docs/config_guides/slot_types#string) = <code>'jexl:get(feature,'score')'</code> | the label to appear at the apex of the arcs<br>_callback args:_ `feature` |
| <span id="slot-archeight">**arcHeight**</span><br>[`number`](https://jbrowse.org/jb2-staging/docs/config_guides/slot_types#number) = <code>'jexl:log10(get(feature,'end')-get(feature,'start'))*50'</code> | the height of the arcs<br>_callback args:_ `feature` |
| <span id="slot-caption">**caption**</span><br>[`string`](https://jbrowse.org/jb2-staging/docs/config_guides/slot_types#string) = <code>'jexl:get(feature,'name')'</code> | the caption to appear when hovering over any point on the arcs<br>_callback args:_ `feature` |
| <span id="slot-displaymode">**displayMode**</span><br>[`stringEnum`](https://jbrowse.org/jb2-staging/docs/config_guides/slot_types#stringenum) (arcs, semicircles) = <code>'arcs'</code> | render semi-circles instead of arcs |
| <span id="slot-minscore">**minScore**</span><br>[`number`](https://jbrowse.org/jb2-staging/docs/config_guides/slot_types#number) = <code>0</code> | hide arcs whose feature score is below this; features with no score are always drawn |
| <span class="slot-group">Inherited from [BaseLinearDisplay](../baselineardisplay)</span> | <span class="slot-group-count">6 slots</span> |
| <span id="slot-maxfeaturescreendensity">**maxFeatureScreenDensity**</span><br>[`number`](https://jbrowse.org/jb2-staging/docs/config_guides/slot_types#number) = <code>1</code> | maximum features per pixel before showing a "too many features" message<br>_advanced_ |
| <span id="slot-height">**height**</span><br>[`number`](https://jbrowse.org/jb2-staging/docs/config_guides/slot_types#number) = <code>100</code> | default height for the track |
| <span id="slot-mouseover">**mouseover**</span><br>[`string`](https://jbrowse.org/jb2-staging/docs/config_guides/slot_types#string) = <span class="cell-more"><button type="button" class="cell-more-trigger"><code>'jexl:get(feature,'_mouseOver')&#124;&#124;get(feature,'name')&#124;&#124;get(featu…</code></button><dialog class="cell-dialog"><form method="dialog"><button class="cell-dialog-close" aria-label="Close">✕</button></form><pre><code>'jexl:get(feature,'_mouseOver')&#124;&#124;get(feature,'name')&#124;&#124;get(feature,'function')&#124;&#124;get(feature,'id')'</code></pre></dialog></span> | text to display when the cursor hovers over a feature<br>_callback args:_ `feature` |
| <span id="slot-jexlfilters">**jexlFilters**</span><br>`stringArray` = <code>[]</code> | config jexlFilters are deferred evaluated so they are prepended with jexl at runtime rather than being stored with jexl in the config |
| <span id="slot-fetchsizelimit">**fetchSizeLimit**</span><br>[`number`](https://jbrowse.org/jb2-staging/docs/config_guides/slot_types#number) = <code>1_000_000</code> | maximum data to attempt to download for a given track, used if adapter doesn't specify one<br>_advanced_ |
| <span id="slot-forceload">**forceLoad**</span><br>[`boolean`](https://jbrowse.org/jb2-staging/docs/config_guides/slot_types#boolean) = <code>false</code> | Declarative equivalent of the "Force load" button on the "too much data" banner: when true the display always renders, however large the region or dense the features. Off by default (the gate guards against huge downloads). Set it on a view no one can interact with — an embedded / notebook view, or a screenshot — where the region is known and you want it drawn without a click.<br>_advanced_ |