# `FitCurve`

*Function*

## Declaration

```swift
func FitCurve(_ d: UnsafePointer<NSPoint>!, _ nPts: Int32, _ error: Float, _ pen: (any GSPenProtocol & NSObjectProtocol)!)
```

```objc
void FitCurve(const NSPoint *d, int nPts, float error, NSObject<GSPenProtocol> *pen);
```

```python
FitCurve(d: NSPoint, nPts: int, error: float, pen: NSObject<GSPenProtocol>)
```

## See Also

### Curve Fitting

- [`FitCubic`](/Core/GlyphsCore/FitCubic)
- [`FitCubicSingle`](/Core/GlyphsCore/FitCubicSingle)
- [`GSDetectBreaksAndFit`](/Core/GlyphsCore/GSDetectBreaksAndFit)
- [`GSCubicFitsPoints`](/Core/GlyphsCore/GSCubicFitsPoints)
- [`GSCubicCollinearish`](/Core/GlyphsCore/GSCubicCollinearish)
- [`GSCalculateErrorLength`](/Core/GlyphsCore/GSCalculateErrorLength)
- [`GSSignificantT`](/Core/GlyphsCore/GSSignificantT)
- [`splitBezierCurveTo`](/Core/GlyphsCore/splitBezierCurveTo)