From Synfig Studio :: Documentation
Splines are vector shapes made up of Bezier curves joined together by vertexes.
Splines are the most commonly used objects in any normal animation done with Synfig, and can be made using the Spline Tool and many other Tools.
On the WorkArea you can manipulate the "Spline" shape by both handles (vertex or tangent) and directly from the spline segment (the curve).
- Spline Tool page for more information.
- The Draw Tool has an option to "Extend" a spline.
- The "How Do I" page's Artwork_Composition section has some entries about spline stuff.
Project for illustration : File:Spline of spline.sifz