---
title: CGPathFillRule.winding
framework: coregraphics
role: symbol
role_heading: Case
path: coregraphics/cgpathfillrule/winding
---

# CGPathFillRule.winding

A rule that considers a region to be interior to a path if the winding number for that region is nonzero.

## Declaration

```swift
case winding
```

## Discussion

Discussion This rule plots a ray from any region to be evaluated toward the bounds of the drawing, then counts the closed path elements that the ray crosses: +1 for counterclockwise paths, -1 for clockwise. The rule defines interior regions as those where the sum of crossings is nonzero, and exterior regions as those where the sum of crossings is zero.

## See Also

### Enumeration Cases

- [CGPathFillRule.evenOdd](coregraphics/cgpathfillrule/evenodd.md)