This is the documentation of version 1.0.0-rc.4. Go to the latest version, 1.0.0-rc.5.

Function getSectionBBox

getSectionBBox(route: Route, section: RouteSpan): OptionalBBox
Calculates the bounding box for a route section.

It samples the section's coordinates at three points:
- The start point, at startPointIndex.
- The middle point, halfway between start and end.
- The end point, at endPointIndex.
Parameters
- route: Route
  The route containing the section.
- section: RouteSpan
  The section, or any RouteSpan, to calculate the bbox for.
Returns OptionalBBox
The bounding box as [west, south, east, north], or undefined if the section or route is invalid.
Remarks
- Three points are fast, but a winding section can stray outside their box. For a tighter box, pass the section's slice of coordinates as a LineString to bboxFromGeoJSON.
- It returns undefined if the route has no coordinates or the section indices are invalid.
Example
```
const section = route.properties.sections.country[0];
// section = { id: 'section-1', startPointIndex: 0, endPointIndex: 3, countryCodeISO3: 'NLD' }

const bbox = getSectionBBox(route, section);
// Returns: [west, south, east, north] spanning the section, or undefined
```