# CurveExtensionStyle enum

Namespace: [Rhino.Geometry](https://developer.rhino3d.com/api/rhinocommon/namespace/rhino.geometry.md) · Assembly: [RhinoCommon](https://developer.rhino3d.com/api/rhinocommon/assembly/rhinocommon.md) · Since v5.0

```cs
public enum CurveExtensionStyle
```

Defines enumerated values for styles to use during curve extension, such as "Line", "Arc" or "Smooth".

## Values

| Name | Value | Description |
| --- | --- | --- |
| Line | 0 | Curve ends will be propagated linearly according to tangents. |
| Arc | 1 | Curve ends will be propagated arc-wise according to curvature. |
| Smooth | 2 | Curve ends will be propagated smoothly according to curvature. |