[Qgis-user] graduated symbols for point layers

[Giovanni Manghi]

This is tricky:

if you select "advanced -> select scale field" *before* hitting
"classify" then the size symbols won't be scaled.

If you do the other way it will work as expected.

cheers

-- Giovanni --


On Tue, 2011-11-22 at 09:03 -0600, David Fawcett wrote:
> I can confirm that this is a problem in 1.8.0-Trunk.
> 
> Graduated symbols used to 'just work', now they don't.  If they do
> somehow still work, it is very unintuitive.  I recently tried to show
> off some data using QGIS in a workshop that I was teaching.  I had
> upgraded QGIS to show off the latest look and features.  It was
> embarrassing when I couldn't do something simple like make graduated
> size symbols...
> 
> Here is the version that I am using (on Win32)
> 
> 
> QGIS version
> 1.8.0-Trunk
> QGIS code revision
> 33b7e31
> Compiled against Qt
> 4.7.1
> Running against Qt
> 4.7.1
> GDAL/OGR Version
> 1.8.1
> GEOS Version
> 3.2.2
> PostgreSQL Client Version
> 8.3.10
> SpatiaLite Version
> 2.4.0
> QWT Version
> 5.2.1
> This copy of QGIS writes debugging outpute.
> 
> 
> David.
> 
> On Mon, Nov 14, 2011 at 10:06 AM, Caroline Rendon
> <caroline.t.rendon at gmail.com> wrote:
> > Hi Sake,
> >
> > This doesn't work for me. The symbols still appear in graduated colors, all
> > the same size - and the size doesn't seem to change when I change the
> > number, although it does between millimeters and map units. I'm sure there's
> > just something I'm missing (I'm new to QGIS) but I can't figure it out.
> > Thanks for your help!
> >
> > Caroline
> >
> > On Sat, Nov 12, 2011 at 3:08 AM, Sake Wagenaar <sw1234 at planet.nl> wrote:
> >>
> >> Hi Caroline,
> >>
> >> If you use new symbology, the option to scale point symbols is hidden
> >> under the button 'Advanced'. With 'Size scale field' you can select a field.
> >> Next you have to change 'Size', to give the symbols the size you want. If
> >> the values are large, and you use millimeters, the symbols get much too
> >> large, even if you use the smallest possible value for Size (0,01).  A
> >> better option is to use map units.
> >>
> >> Sake Wagenaar
> >>
> >> Op 11-11-2011 23:08, Caroline Rendon schreef:
> >>
> >> Hi,
> >> I'm trying to create graduated symbols for a point layer, and the only
> >> option it will give me is by color, but I want graduated symbols by size. I
> >> was only able to get the color to work with "old symbology" because in new
> >> symbology the layer would just disappear altogether and I had to re-add it.
> >> So in old symbology I can get dots of different colors but not different
> >> sizes. Am I missing a plugin or something? I'm working in 1.7.1 on Win XP.
> >> Thanks in advance for your help!!
> >>
> >> Caroline Rendon
> >>
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