# LocusDistance delegate

Namespace: [Grasshopper2.Geometry.SpatialTree](https://developer.rhino3d.com/api/gh2/namespace/grasshopper2.geometry.spatialtree.md) · Assembly: [Grasshopper2](https://developer.rhino3d.com/api/gh2/assembly/grasshopper2.md)

```cs
public delegate LocusDistance
```

Delegate used in custom near searches.

**Signature:**

```cs
double LocusDistance(Locus locus)
```

**Parameters:**

- `locus` ([Locus](https://developer.rhino3d.com/api/gh2/type/grasshopper2.geometry.spatialtree.locus.md)): Locus for distance measurement.