# `GSApproximateQuartic`

*Function*

## Declaration

```swift
func GSApproximateQuartic(_ quart: UnsafeMutablePointer<NSPoint>, _ lines: UnsafeMutablePointer<NSPoint>)
```

```objc
void GSApproximateQuartic(NSPoint quart[5], NSPoint *lines);
```

```python
GSApproximateQuartic(quart: NSPoint, lines: NSPoint)
```

## See Also

### Curve Subdivision and Conversion

- [`GSHalveCubicPoints`](/Core/GlyphsCore/GSHalveCubicPoints)
- [`GSHalveCubicSegment`](/Core/GlyphsCore/GSHalveCubicSegment)
- [`GSHalveQuadraticPoints`](/Core/GlyphsCore/GSHalveQuadraticPoints)
- [`GSHalveQuadraticSegment`](/Core/GlyphsCore/GSHalveQuadraticSegment)
- [`GSQuadratic2Cubic`](/Core/GlyphsCore/GSQuadratic2Cubic)
- [`GSDividQuadraticPoints`](/Core/GlyphsCore/GSDividQuadraticPoints)
- [`GSDividQuadraticSpline`](/Core/GlyphsCore/GSDividQuadraticSpline)
- [`GSDividCubicPoints`](/Core/GlyphsCore/GSDividCubicPoints)
- [`GSDividCubicPointsTs`](/Core/GlyphsCore/GSDividCubicPointsTs)
- [`GSDividCubicSegment`](/Core/GlyphsCore/GSDividCubicSegment)
- [`GSDividQuarticSegment`](/Core/GlyphsCore/GSDividQuarticSegment)
- [`GSQuarticToCubic`](/Core/GlyphsCore/GSQuarticToCubic) — Converts from a quartic curve segment to two cubic curve segments.
- [`GSSegmentBetweenPoints`](/Core/GlyphsCore/GSSegmentBetweenPoints)