On Thu, Feb 28, 2008 at 11:13 AM, dorai iyer wrote:

Hi,
I am trying to draw a vector ( as a single polygonal line) and then stroke it and measure its length using
gimp-vectors-stroke-get-length.

So I first used python to try to do it. Here is the script def vector_length(image, drawable):
vectors = pdb.gimp_image_get_active_vectors(image) strokes = pdb.gimp_vectors_get_strokes(vectors) len1 = pdb.gimp_vectors_stroke_get_length(vectors, stroke1, 100.0)

.. stroke1 is the unbound variable. Why would it exist? You never create it.

The following is more correct

nstrokes, strokes = pdb.gimp_vectors_get_strokes(vectors) len0 = pdb.gimp_vectors_stroke_get_length(vectors, strokes[0], 100.0)

the vectors and strokes went fine but I could not get the length

I then thought maybe I should try using tinyscheme and tried the following (let* (
(count 0)
(vector (car(gimp-image-get-active-vectors img))) (strokes (cadr(gimp-vectors-get-strokes vector))) (len (caddr(gimp-vectors-stroke-get-length vector (aref strokes count) 100.0)))
)
(print (list len vector))
I still get an unbound variable error. a search fo previous implementations did not show much. Has anyone used
gimp-vectors-stroke-get-length
in either scm or python successfully and can help resolve my problem. I am more familaiar with python then tinyscheme but not adept at either which is probably clearly reflected in my programming. Thanks for the help.

Your Python code would seem to define 'strokes' but then access 'stroke1'. Unless 'stroke1' is defined somewhere else I should suspect this to be problematic. (I could be missing something as I never use Python.)

Your Scheme code looks fine except for the fact that 'gimp-vectors-stroke-get-length' returns a list containing just a single item, the length. Use 'car' instead of 'caddr' and your code should work.

(let* (
(count 0)
(vector (car(gimp-image-get-active-vectors img))) (strokes (cadr(gimp-vectors-get-strokes vector))) (len (car(gimp-vectors-stroke-get-length vector (aref strokes count) 100.0)))) (print (list len vector))
)

Quoting dorai iyer :

Hi,
I am trying to draw a vector ( as a single polygonal line) and then stroke it and measure its length using
gimp-vectors-stroke-get-length.

So I first used python to try to do it. Here is the script def vector_length(image, drawable):
vectors = pdb.gimp_image_get_active_vectors(image) strokes = pdb.gimp_vectors_get_strokes(vectors) len1 = pdb.gimp_vectors_stroke_get_length(vectors, stroke1, 100.0) the vectors and strokes went fine but I could not get the length

I then thought maybe I should try using tinyscheme and tried the following (let* (
(count 0)
(vector (car(gimp-image-get-active-vectors img))) (strokes (cadr(gimp-vectors-get-strokes vector))) (len (caddr(gimp-vectors-stroke-get-length vector (aref strokes count) 100.0)))
)
(print (list len vector))
I still get an unbound variable error. a search fo previous implementations did not show much. Has anyone used
gimp-vectors-stroke-get-length
in either scm or python successfully and can help resolve my problem. I am more familaiar with python then tinyscheme but not adept at either which is probably clearly reflected in my programming. Thanks for the help.