ofn-bend-path

[Ofnuts]

Doh!!! forgot to upload! Done now, version should be 0.3. Now you can have several nodes in each envelope strokes.

[rich2005]

Ok, got that, a quick try and works nicely. Much larger file 10364B

You have a folder (empty) included in the zip 'home/bd/Code/Gimp/PathTools/ofn-bend-path/' that might confuse some.

[Ofnuts]

(12-24-2017, 11:00 AM)rich2005 Wrote: Ok, got that, a quick try and works nicely. Much larger file  10364B

You have a folder (empty) included in the zip 'home/bd/Code/Gimp/PathTools/ofn-bend-path/' that might confuse some.

1) Yes, code is somewhat more complex

2) Thanks, removed, and uploaded

[Espermaschine]

(12-24-2017, 09:50 AM)rich2005 Wrote: How did you get that sine wave form with only a start and an end node?

I was thrown off by that as well  

But you can make a fake sine with only four points.

[Ofnuts]

(12-24-2017, 01:51 PM)Espermaschine Wrote: But you can make a fake sine with only four points.

Just three is enough for a full wavelength:

   

[Blighty]

I was just playing with the script and ran into an error.

[Espermaschine]

(12-24-2017, 07:56 PM)Blighty Wrote: I was just playing with the script and ran into an error.

Works for me (but i remade it from the screenshot, did not use Blighty's xcf).

   

[Ofnuts]

Looking into it. The strangeness is that the 3rd degree polynomial is actually a 1st degree one in some curve elements.

Btw, how did you generate that sine wave?

---

OK, figured out the cause, the individual Bézier curves in your top curve have the X coordinates of the tangent be exactly 1/3 from the extremities(*):

Code:

PointsX: [0.0, 12.5, 25.0, 37.5], coeffsX: [0.0, 37.5, 0.0, 0.0]
PointsX: [37.5, 50.0, 62.5, 75.0], coeffsX: [37.5, 37.5, 0.0, 0.0]
PointsX: [75.0, 87.5, 100.0, 112.5], coeffsX: [75.0, 37.5, 0.0, 0.0]
PointsX: [112.5, 125.0, 137.5, 150.0], coeffsX: [112.5, 37.5, 0.0, 0.0]
PointsX: [150.0, 162.5, 175.0, 187.5], coeffsX: [150.0, 37.5, 0.0, 0.0]

This makes the 3rd and 2nd degree coefficients equal to 0. I'll have to improve the math a bit. Stay tuned.

(*) this also true of the bottom sine, however, since the wavelength is different, the range on X is not divisible exactly by 3, so woth the round off errors, the coefficients are small but not null.

---

OK, fixed, see v0.3 (just uploaded to SF)

Thanks for the report and the test-case.

[Blighty]

(12-24-2017, 11:20 PM)Ofnuts Wrote: Btw, how did you generate that sine wave?

It is a script called Shape Paths, from here:
http://registry.gimp.org/node/59

(Does it create too many nodes?     )

[Espermaschine]

(12-25-2017, 08:23 PM)Blighty Wrote: It is a script called Shape Paths, from here:
http://registry.gimp.org/node/59

(Does it create too many nodes?     )

*shock*

its mandatory to use only ofnuts path tools here !!!!!!!  

the correct answer is: "dear ofnuts, of course i used ofn-path-waves"