CGPathAddCurveToPoint

CGPathAddCurveToPoint is a function in the Core Graphics framework of Apple's operating systems, used for defining curved segments within a path. This function allows developers to add a cubic Bézier curve to an existing path. A cubic Bézier curve is defined by four points: a starting point, an ending point, and two control points. The starting point of the curve is implicitly the current point of the path.

The function takes several arguments: the CGPathRef object representing the path being modified, the first control point, the second control point, and the ending point of the curve. The control points influence the shape and curvature of the line segment between the starting and ending points. By adjusting the positions of these control points, developers can create a wide variety of smooth curves.

This function is essential for creating complex vector graphics, shapes, and drawing intricate lines within applications built for macOS, iOS, watchOS, and tvOS. It is often used in conjunction with other path manipulation functions like CGPathMoveToPoint and CGPathAddLineToPoint to construct entirely custom shapes. The precision offered by Bézier curves makes them a fundamental tool for graphic design and user interface elements.