Re: automatic or scripted export of graphics from gnumeric
- From: Jean Brefort <jean brefort free fr>
- To: John Denker <jsd av8n com>, gnumeric-list gnome org
- Subject: Re: automatic or scripted export of graphics from gnumeric
- Date: Fri, 13 Jan 2017 16:38:18 +0100
Le vendredi 13 janvier 2017 à 06:37 -0700, John Denker a écrit :
On 01/13/2017 02:38 AM, Jean Brefort wrote:
There is currently no script or program doing that but I suppose it
would be not so hard to implement either in C or using a scripting
language and introspection. Probably a few hours or work, depending
of
the wanted options.
I spent a couple hours already looking into this. The closest I
could come to a working model using a scripting language was this:
https://mail.gnome.org/archives/gnumeric-list/2015-November/msg0000
1.html
which doesn't actually work. When I try it using python (aka
python2.7) I observe:
Traceback (most recent call last):
File "./gnumeric-introspection", line 4, in <module>
gi.require_version('GOffice','0.10')
AttributeError: 'module' object has no attribute
'require_version'
You might have a too old GObject Introspection version, try without
this line.
or using python3 (aka python3.5) it doesn't even get that far.
I observe:
Traceback (most recent call last):
File "./gnumeric-introspection", line 3, in <module>
import gi
File "/usr/local/lib/python3.5/dist-packages/gi/__init__.py",
line 39
print url
^
SyntaxError: Missing parentheses in call to 'print'
Weird.
Also, the closest I could come to useful documentation was this:
https://lazka.github.io/pgi-docs/Gnm-1.12/classes.html
https://lazka.github.io/pgi-docs/Gnm-1.12/classes/Workbook.html
etc.
A good start.
which AFAICT makes no mention of saving a graph, or even inspecting
the structures within a graph.
You must get the list of graphs using Sheet::objects_get()
-- Are there any working examples of gnumeric introspection that
could be used as a model?
-- Where should one look for documentation?
-- Or would it be better to give up on introspection and just write
in C, using ssconvert.c as a model?
May be C might be easier, not sure.
=======================
Also, given a workbook with multiple sheets and multiple graphs per
sheet, what is the proper way to identify a particular graph? In
.svg format, the objects have id="whatever" attributes, but AFAICT
in .gnumeric format they don't.
There is no identifier for graphs or any other object for now. May be
in next major version.
I suppose one could add a title to each graph, using a zero-point
font, and use that for identification. Is there a better way?
This may be related to the code in ssconvert.c where it says:
* HACK: (bug 694408).
*
* We don't have a good way of specifying the
* sheet.
https://bugzilla.gnome.org/show_bug.cgi?id=694408
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