Hi Ross,
I sucessfully use $scale - it should just work, otherwise it is a bug
either in your statement or in QGIS.
I guess in your example your statement is wrong as AND/OR can only be
combined with boolean values (true/false). In your case you combine a
number with another number with OR and of course your statement fails.
You could write your statement with nested CASE statements, such as:
CASE WHEN type = 'town' THEN
CASE WHEN $scale < 100000 THEN 15 ELSE 10 END
WHEN type = 'city' THEN
CASE WHEN $scale < 100000 THEN 20 ELSE 15 END
END
You should get a warning if the syntax in your statement is not correct.
Andreas
Am 2013-11-06 17:44, schrieb McDonaldR:
Thanks Bernhard
That does work.
Any idea how the $scale function works then? It is supposed to return
the current scale of the map canvas but is only available in some
contexts and will be 0 otherwise.
Ross
-----Original Message-----
From: qgis-user-boun...@lists.osgeo.org
[mailto:qgis-user-boun...@lists.osgeo.org] On Behalf Of Bernhard
Ströbl
Sent: 06 November 2013 16:02
To: qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] Scale based label rendering
Hi,
not a solution but a workaround:
simply copy the layer and define a different visibility scale range.
Bernhard
Am 06.11.2013 16:54, schrieb McDonaldR:
Hello list
I want to vary the size of my labels on features both by attribute and
map scale. So, for example, I have a layer of towns and villages and
I want towns labelled with a font size of 20 and villages with a font
size of 10. I can do this with in the label size expression builder:
CASE WHEN "type" = 'town' THEN 20 ELSE 10 END
Now, how can I vary the label size with scale? When the scale is
smaller than 1:100000 then towns must be size 15 and villages size 8.
I thought something like this would work:
(CASE WHEN "type" = 'town' AND $scale< 100000 THEN 20 ELSE 10 END) OR
(CASE WHEN "type" = 'town' AND $scale> 100000 THEN 15 ELSE 8 END)
I tried with the $scale function under Record category but then the
labels disappeared.
Any suggestions?
I am using QGIS 2.0.1-3 on Windows 7.
Thanks
Ross
Ross McDonald | GIS Data Coordinator | Resources Department, IT
Division | Angus Council, Angus House, Orchardbank Business Park,
Forfar, DD8 1AT
T: 01307 476419 | F: 01307 476401 | E:
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Maps<http://www.angus.gov.uk/maps/map_home.cfm>
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