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Re: [udig-devel] points of different sizes andlinesofdifferentthicknesses
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Never mind, a Google search answered my own question. However, I did
stumble across another nice site for examples at MassGIS. The link is
http://lyceum.massgis.state.ma.us/wiki/doku.php?id=wms:sld:home
Dan
On Fri, 2008-05-09 at 09:54 -0700, Dan Putler wrote:
> Hi Jody,
>
> I've leaned something. Much better than my approach. Jody, does this
> approach allow for the inclusion of customized point markers in either
> an svg or png file?
>
> Dan
>
> On Fri, 2008-05-09 at 09:25 -0700, Jody Garnett wrote:
> > Chang, Elizabeth wrote:
> > >
> > >
> > >
> > > Hi, I am new to UDIG and a very new newbie. I have a question about
> > > UDIG capabilities. Is it possible to show points of different sizes
> > > and colors for objects (like a small dot for a small city and a large
> > > circle for a large city)and create lines of different thicknesses or
> > > colors (ideally be able to change the thickness of a single line at
> > > different points) using the style/theme window
> > >
> > This is the kind of thing you need to do "by hand" using the advanced
> > tab of the Style Editor Dialog ...
> >
> > The line width right now is a number:
> > > ...
> > > <LineSymbolizer>
> > > <Stroke>
> > > <CssParameter name="stroke">#319738</CssParameter>
> > > <CssParameter name="stroke-width">2</CssParameter>
> > > </Stroke>
> > > </LineSymbolizer>
> > > ...
> > You need to change it to an expression:
> > e width right now is a number:
> > > ...
> > > <LineSymbolizer>
> > > <Stroke>
> > > <CssParameter name="stroke">#319738</CssParameter>
> > > <CssParameter name="stroke-width"><PropertyName>ATTRIBUTE_NAME</PropertyName></CssParameter>
> > > </Stroke>
> > > </LineSymbolizer>
> > > ...
> > Do do more complicated expressions (say based on your city population)
> > you can get creative.
> >
> > <Add><Div><PropertyName>population</PropertyName><Literal>10000</Div><Literal>1</Literal></Add>
> >
> >
> > For some additional fun examples check this out:
> > - http://geoserver.org/display/GEOSDOC/SLD+Intro+Tutorial
> >
> > For the one about changing width along a single Line you may be out of
> > luck, I can think of some bad ways to do it ... but you are starting to
> > get into "Linear Referencing System" problems; so the Geometry stores X,
> > Y, Z and M (for measure) and thus far only Oracle is supporting that out
> > of the DataStores uDig uses.
> > >
> > > If not, I was wondering if you have considered adding this feature and
> > > how hard it would be for me to try to add this feature. Where would I
> > > start?
> > >
> > You can certaintly write your own renderer (for the line width problem),
> > have a look at the sameple code in the developers guide; there is an
> > example renderer checked into svn.
> > >
> > > I also have a second question about the save/save As feature. Have you
> > > considered adding this feature and is this something a newbie like me
> > > could do?
> > >
> > Actually we used to always do an Open / Save / Save As lifecycle; but
> > people hated it so now we auto save. You are more than welcome to add a
> > Save As command; it should be able to duplicate the open Map, change the
> > name and save the result...
> >
> > Cheers,
> > Jody
> > _______________________________________________
> > User-friendly Desktop Internet GIS (uDig)
> > http://udig.refractions.net
> > http://lists.refractions.net/mailman/listinfo/udig-devel
--
Dan Putler
Sauder School of Business
University of British Columbia
