[Qgis-developer] Expression Builder Questions

[Etienne Tourigny]

Sort of a little late in the discussion - but would it be possible to
use an external parser so that most mathematical functions would be
supported?

Etienne

On Tue, Jul 24, 2012 at 10:31 AM, leyan ouyang <ouyang.leyan at hotmail.com> wrote:
> For the rounding issue: as a workaround, you can do some ugly things like
> toreal( toint( X * 100)) / 100
>
> Leyan
>
>> Date: Tue, 24 Jul 2012 13:43:45 +0200
>> From: a.neumann at carto.net
>> To: madmanwoo at gmail.com
>> CC: qgis-developer at lists.osgeo.org
>> Subject: Re: [Qgis-developer] Expression Builder Questions
>
>>
>> Hi Nathan,
>>
>> Thanks for the reply.
>>
>> It is not so urgent for me - and I agree that the scale issue would be
>> better solved with rule-based labeling.
>>
>> Andreas
>>
>> On Tue, 24 Jul 2012 20:46:54 +1000, Nathan Woodrow wrote:
>> > Hey Andreas,
>> >
>> > On Tue, Jul 24, 2012 at 5:21 PM, Andreas Neumann
>> > <a.neumann at carto.net> wrote:
>> >> Hi all - esp. Nathan ;-),
>> >>
>> >> I have a couple of questions regarding the expression builder:
>> >>
>> >> 1. Would it be possible to add a $scale support which we could
>> >> combine with
>> >> CASE ? This would be quite powerful to add condiditional labeling
>> >> depending
>> >> on scale ranges.
>> >
>> > Possible yes, however I would like to see proper rule based
>> > labelling,
>> > like the rule based rendering, implemented instead as that would
>> > achieve the same thing but with more power.
>> >
>> >>
>> >> 2. Is there a rounding function available other than toint() ? I
>> >> envision
>> >> something like PostgreSQL round function:
>> >> http://www.postgresql.org/docs/9.1/interactive/functions-math.html
>> >> where one
>> >> can specify the number of digits one wants to round to.
>> >
>> > Yeah this can be done. I'll add it once I get some free time.
>> >
>> >>
>> >> 3. Is there a string formatting function available that allows to
>> >> format
>> >> longer nunmbers for better readability? E.g. 1000000.00 would become
>> >> 1'000'000.00
>> >
>> > Sure this is doable as well. I'll have a look into it.
>> >
>> > Anyone else is free to have a go if they already know how, I'm pretty
>> > busy at the moment so no ETA on the above functions.
>> >
>> > Regards,
>> > Nathan
>>
>> --
>> --
>> Andreas Neumann
>> Böschacherstrasse 10A
>> 8624 Grüt (Gossau ZH)
>> Switzerland
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