CGLineJoinRound

CGLineJoinRound is a figure-ground control used in 2D graphics drawing. It is a Bezier curve-based pen mode that allows the user to specify how a series of connected lines are joined together in a freehand or sketch-like drawing.

When CGLineJoinRound is applied to a series of connected lines, the edges of the lines are smoothly curved using a Bezier curve. The curve is generated using Hermite interpolation, creating a smooth and fluid transition between the lines. This gives the user the option to produce a wide range of line joining styles, from very rounded to very sharp.

The CGLineJoinRound control is similar to the more commonly known End Cap control. However, while the End Cap control is used to allow the curves on each end of the line to be controlled independently, CGLineJoinRound allows the curves to be constantly interpolated between start and end, producing a uniform and connected look across the entire drawing.

CGLineJoinRound is used primarily in user graphics tools and APIs to provide a natural-looking drawing experience. It is useful when users want to create a freehand or hand-drawn look in their digital art or diagrams. Its precise control over the joining of lines makes it a versatile tool for designers and developers alike.

CGLineJoinRound has a wide range of applications, from simple drawing tools to complex graphics editors. Its flexibility in creating varying line joining styles has made it a staple control in the world of 2D graphics. The tight control offered by CGLineJoinRound means it is well suited to producing a realistic-looking freehand drawing effect.