Re: improve a spline

saito <saitology9@gmail.com> posted:

On 6/12/2025 7:08 PM, Emiliano wrote:

 
If by "smooth" you mean antialias, then no, Tk canvas doesn't do antialias.
As I undertand it, the tkpath package does, but I can't confirm since never
used it.
 

 
Thanks for taking a look. This is a piece of very old code from someone
else and I need to decide whether to improve it or trash it.
 
I guess there is no escaping the jagged lines. That is OK. How about
just making it a simple curve?  As it is currently, there are two points
where it curves making it look like an S. Any ideas to reduce it to
simple / relaxed sine curve?

This is the character of the Bezier smoothing. If you want a curve with
only a single "bent", you might consider to derive a midpoint from the
two endpoints and draw a smoothed line (-smooth 1) through THREE points.

A possible method:
- Take the vector from point A to point B
- Determine the normal n to that vector (note: choice of direction!)
- Use a fraction of the distance between A and B to calculate the new point:

  new point = (A + B)/2 + fraction * distance(A,B) * normal vector

You have a number of choices here :).