CGMutablePath

CGMutablePath is a data type in Apple's Core Graphics framework that represents a mutable path. A path is a sequence of connected lines, curves, and other geometric segments. As a mutable object, a CGMutablePath can be modified after it is created. This means you can add new segments, delete existing ones, or change the properties of the path over time.

The primary use of CGMutablePath is for constructing complex shapes programmatically. Developers can use various functions provided by the Core Graphics API to add straight line segments, quadratic and cubic Bézier curves, and arcs to the path. These segments can be combined to form open or closed shapes. Once a path is defined, it can be used for various drawing operations, such as stroking (drawing the outline) or filling (coloring the interior).

CGMutablePath is often employed when the geometry of a shape is not static and needs to be dynamically generated or altered. For instance, it can be used to create custom user interface elements, animate complex trajectories, or define arbitrary clipping regions. The mutability of CGMutablePath offers flexibility in defining and manipulating graphical outlines within an application. After a path has been constructed, it can be converted to an immutable CGPath for use in drawing contexts.