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Re: [udig-devel] uDig Questions
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Scott wrote:
Good morning all,
I have a few questions regarding uDig. If this is not the proper
forum for these questions please point me in the right direction.
1. Is there functionality built into uDig to execute SQL-like commands
on feature sets? (i.e., selecting all cites with population over n
amount)
FeatureSource.getFeatures( filter );
you create your filter using either:
- a factory
- from xml
- from "common query language" - similar to SQL WHERE clause
To try this open the table view, select CQL and start typing; examples
in online help.
2. Is it possible to generate and view reports inside of uDig? (bar
graphics, pie charts, etc.)
No; but someone has donated code around the BIRT engine (which handles
this sort of thing). We have no mandiate / funding to integrate this
work so the best
I can do is point you in that direction and let you know it works. You
will also find the printing support much improved on trunk; people have
been making
simple reports using custom "Box" implementations to display tables.
3. Is there a way to create and set custom symbols for point
geometry? As opposed to selecting a square, or arrow, or any of the
other predefined symbols.
Yes; the renderer is SLD 1.0 complient allowing you to do many things
beyond what appears in the style editor - for details/documentation read
the spec. We can assemble examples in the online help as well.
uDig 1.1.0: you need to go into your Style Layer Descriptor document
(yes a mass of xml) and change the point symbolizers to point to an
external graphic (PNG, SVG, whatever).
uDig 1.2.x: you can also now supply these symbols using a factory; if
the factory recognizes a mark or external graphics reference it knows
how to handle to can generate the symbol locally
4. The print option is almost always grayed out for me. Is there
something special I have to do in order to be able to print the
current view?
I hope you mean the current Map Editor?
uDig 1.1.0: open a map, select new page, choose the template, adjust the
layout to suite your needs, print the page
uDig 1.2.0: print; choose the template, paper comes out -or- export pdf,
choose the template, file comes out -or- new page, choose template,
adjust layout, paper comes out
5. Is there a way to switch how lat, long is displayed? (hr, mins,
secs, or degreees)
Not yet; it could be added as a preference option, but I think it
actually is based on the current projection (so if your projection is in
meters it should be in meters). I recall acuster mentioning that the
units need to be displayed .. the unit information is available so this
functionality can be implemented.
6. Is it possible to send information to uDig from another
application? For example, if I'm running another application and I
select some point (lat, lon) and hit a button to send it to uDig, how
is that accomplished?
I would handle it as cut&paste right; or drag and drop right now. How to
send information between applications changes from platform to platform.
If you want to make a plugin that opens up a socket and allows another
application to send commands you can; but this is the first time I have
heard of such a request.
What did you have in mind? Note normally we try and embed other
applications into eclipse; browers, pdf reader, media players for video
etc...
7. Is there currently functionality to display great circle paths?
No; but you could add a renderer for that.
8. Can you perform a union of polygons?
Yes. Try the Axios advanced editing tools.
9. Is there a central repository of uDig plug-ins (descriptions +
downloads)?
We tried to set that up with the "Community" space on the wiki; for udig
iteself on the website is the svn information; other companies like
Axios are maintaining their own compatible plug-ins.
I've been playing with uDig for a week or so now, I've done all the
tutorials and I'm pretty pleased with what I've seen thus far.
We have many more tutorials as part of our training course :-) As you
get into the advanced topics you may wish to review the source code
(which is available in svn); or if you are associated with an Academic
institution I can get you access to the training materials.
Though I will say that the website is difficult to navigate and near
impossible to pull meaningful information from, which is why I'm
sending this email. Thank you all for your time!
Feedback on the website is welcome; it is one of those stories where
each person comes to the site trying to find different information.
Jody
