Cubic Spline? Anyone?

[trevix]

Hi.
I have been using the graph widget but I would like to convert a scattered set of points (X,Y) to a smooth curved line (like in the attachment).
So, giving up the graph widget, I did some research and I realized that:
- my math sucks
- probably i need to do "cubic spline interpolation" (!?)

Somebody has done this already or is willing to share some simple math example?

Thanks
(I've seen the BezieCurve in the Rasberry section but I am not sure if is the correct example to study)

[richmond62]

https://en.wikiversity.org/wiki/Cubic_S ... polynomial.

Ooer: that only served to remind me that, at about 16, I got off the 'Maths Train.'

[trevix]

Gasp!
Not very helpful to me.
I need some LC code

[richmond62]

Actually that Wikipedia page explains things in a comparatively comprehensible fashion.

[stam]

https://en.wikiversity.org/wiki/Cubic_S ... polynomial.

Ooer: that only served to remind me that, at about 16, I got off the 'Maths Train.'

I like to think I'm OK at maths but that wikipedia page made my eyes water...


A cursory search found this: livecode-bezier-line-demo
Untested and don't know if it will help, but worth a look...

[Klaus]

I like to think I'm OK at maths but that wikipedia page made my eyes water...

I was alway weak at math, and yes, I immediately closed the page above when I saw it!

A cursor search found this: livecode-bezier-line-demo
Untested and don't know if it will help, but worth a look...

Ah, one of Scott Rossis stacks, can't be wrong and will surely look gorgeous!

[opn]

I'm looking for that function to smooth the points of a curve graphic!

[richmond62]

https://use-livecode.runrev.narkive.com ... aphic-oval

Frankly, I'm drunk, but I'll get back to this chestnut when I sober up.

And, oddly enough, through an alcoholic haze, the word 'interpolation' crops up.

AND, "Krishna on a bike", trying to send an SVG file of a boardgame to a Laser printer via some extremely wonky Chinglish
documentation at the moment, and/or generate "G Code" via an Inkscape extension to do the same, while thinking
about smoothing curves.

[richmond62]

Well, I certainly had fun playing with this:

go url "http://tactilemedia.com/blog/bezier"

It is a very great sadness that Alejandro 'vanished'.

The thing that really rocked was that I had never come across a

Code: Select all

before mouseDown

handler before . . .

[stam]

Everything on Scott Rossi's blog post is worth looking at.
I especially liked the translucent flashing stack: animated WindowShapes

http://tactilemedia.com/blog/2018/05/12 ... -the-past/

------------
edit: having had a closer look at the animated windowshapes stack again i must admit it's clever
the main image is basically an animated PNG where each frame's binary data is stored in a custom prop of the base image and is just cycled through.
Simple but effective!