Thanks Andreas
Yeah my syntax was screwy
This worked:
CASE WHEN "type" = 'town' THEN
(CASE WHEN $scale < 100000 THEN 15 ELSE 10 END)
ELSE
(CASE WHEN $scale > 100000 THEN 20 ELSE 15 END)
END
Thanks for the help
Cheers
Ross
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Andreas Neumann
Sent: 06 November 2013 16:54
To: [email protected]
Subject: Re: [Qgis-user] Scale based label rendering
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: [email protected]
> [mailto:[email protected]] On Behalf Of Bernhard
> Ströbl
> Sent: 06 November 2013 16:02
> To: [email protected]
> 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:
>> [email protected]<mailto:[email protected]> | W: Angus
>> Maps<http://www.angus.gov.uk/maps/map_home.cfm>
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content may be intercepted. Angus Council does not accept any liability for any
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