I find them super-intuitive to use. The fact that at each node you can make it close, sharp, or interpolating is quite helpful. They're also not hard to implement. You can read my js code to see how I did it.
They're implemented in Xfig and just about nowhere else. I wish they were elsewhere. I've been thinking about getting them into GNU IMP. Maybe some day I'll sit down and try to write patches for it.
https://inversethought.com/jordi/xsplines/
I find them super-intuitive to use. The fact that at each node you can make it close, sharp, or interpolating is quite helpful. They're also not hard to implement. You can read my js code to see how I did it.
They're implemented in Xfig and just about nowhere else. I wish they were elsewhere. I've been thinking about getting them into GNU IMP. Maybe some day I'll sit down and try to write patches for it.