[Qgis-user] Looking for a function or variable to retrieve canvas extent

[DelazJ]

Unfortunately, this was also my conclusion.... And I'm not sure to
understand why: is it a choice of design to not expose them or a missing
feature (that i can open a report for)?

I can do an ovelap check of the feature geometry and a static extent ie,
something like
within ($geometry, make_polygon(geom_from_wkt('LINESTRING(a closed
rectangle based on canvas extent coordinates in status bar)')))
and it seems to work once on two (not pretty sure of the result!) but it's
STATIC!

2017-06-21 18:05 GMT+02:00 Alexandre Neto <senhor.neto at gmail.com>:

> I guess those variables are simply not accessible from the attribute table
> window. So there is no way you can use the map canvas for conditional
> formatting.
>
> DelazJ <delazj at gmail.com> escreveu no dia quarta, 21/06/2017 às 16:34:
>
>> Thanks Alexandre, but it's too hot to have me doing some maths right now
>> :-)
>>
>> Actually, what I want to do is to apply some conditional formatting in
>> the attribute table using the canvas extent values but for some reason,
>> those variables you mentioned are not exposed in that expression builder
>> dialog.
>> There's also a @map_extent variable in master which returns the geometry
>> (for composer map only? or canvas also?) but like others, it's not exposed.
>>
>>
>> 2017-06-21 17:10 GMT+02:00 Alexandre Neto <senhor.neto at gmail.com>:
>>
>>> How about using the map_extent_center, map_extent_height and
>>> map_extent_width to create a geometry?
>>>
>>>
>>> DelazJ <delazj at gmail.com> escreveu no dia quarta, 21/06/2017 às 14:53:
>>>
>>>> Hi,
>>>>
>>>> In the Expression dialog, is there a function or a variable that can
>>>> return the current map canvas?
>>>> I would like for example apply a value to all features that fall within
>>>> the current map canvas but fail to find the right combination (if ever
>>>> possible).
>>>>
>>>> Thanks for any hint,
>>>> Harrissou
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>>>
>>> --
>>> Alexandre Neto
>>> ---------------------
>>> @AlexNetoGeo
>>> http://sigsemgrilhetas.wordpress.com
>>> http://gisunchained.wordpress.com
>>>
>>
>> --
> Alexandre Neto
> ---------------------
> @AlexNetoGeo
> http://sigsemgrilhetas.wordpress.com
> http://gisunchained.wordpress.com
>
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