---
title: "addArc(center:radius:startAngle:endAngle:clockwise:)"
framework: coregraphics
role: symbol
role_heading: Instance Method
path: "coregraphics/cgcontext/addarc(center:radius:startangle:endangle:clockwise:)"
---

# addArc(center:radius:startAngle:endAngle:clockwise:)

Adds an arc of a circle to the current path, specified with a radius and angles.

## Declaration

```swift
func addArc(center: CGPoint, radius: CGFloat, startAngle: CGFloat, endAngle: CGFloat, clockwise: Bool)
```

## Parameters

- `center`: The center of the arc, in user space coordinates.
- `radius`: The radius of the arc, in user space coordinates.
- `startAngle`: The angle to the starting point of the arc, measured in radians from the positive x-axis.
- `endAngle`: The angle to the end point of the arc, measured in radians from the positive x-axis.
- `clockwise`: doc://com.apple.documentation/documentation/Swift/true to make a clockwise arc; doc://com.apple.documentation/documentation/Swift/false to make a counterclockwise arc.

## Discussion

Discussion This method calculates starting and ending points using the radius and angles you specify, uses a sequence of cubic Bézier curves to approximate a segment of a circle between those points, and then appends those curves to the current path. The clockwise parameter determines the direction in which the arc is created; the actual direction of the final path is dependent on the current transformation matrix of the graphics context. In a flipped coordinate system (the default for UIView drawing methods in iOS), specifying a clockwise arc results in a counterclockwise arc after the transformation is applied. If the current path already contains a subpath, this method adds a line connecting the current point to the starting point of the arc. If the current path is empty, his method creates a new subpath whose starting point is the starting point of the arc. The ending point of the arc becomes the new current point of the path.

## See Also

### Constructing a Current Graphics Path

- [beginPath()](coregraphics/cgcontext/beginpath().md)
- [move(to:)](coregraphics/cgcontext/move(to:).md)
- [addLine(to:)](coregraphics/cgcontext/addline(to:).md)
- [addLines(between:)](coregraphics/cgcontext/addlines(between:).md)
- [addRect(_:)](coregraphics/cgcontext/addrect(_:).md)
- [addRects(_:)](coregraphics/cgcontext/addrects(_:).md)
- [addEllipse(in:)](coregraphics/cgcontext/addellipse(in:).md)
- [addArc(tangent1End:tangent2End:radius:)](coregraphics/cgcontext/addarc(tangent1end:tangent2end:radius:).md)
- [addCurve(to:control1:control2:)](coregraphics/cgcontext/addcurve(to:control1:control2:).md)
- [addQuadCurve(to:control:)](coregraphics/cgcontext/addquadcurve(to:control:).md)
- [addPath(_:)](coregraphics/cgcontext/addpath(_:).md)
- [closePath()](coregraphics/cgcontext/closepath().md)
- [path](coregraphics/cgcontext/path.md)
- [replacePathWithStrokedPath()](coregraphics/cgcontext/replacepathwithstrokedpath().md)