[Qgis-user] Variables in print composer

[Neumann, Andreas]

Hi Uwe, 

All "map_xx" variables are only available on the map frame item itself
(when it is selected) - nowhere else. Items in print composer are on the
same hierarchy - so can't see each other's scope or variables in each
scope. But all items in a composition can see the "composition"
variables because they are one hierarchy above in the scope. 

That's a limitation you can't currently overcome. It would be nice to
cross-reference variables from other elements in the same hierarchy -
but it is not possible currently - at least I don't know how. 

Andreas 

On 2016-06-23 13:36, Uwe Fischer wrote:

> Martin, 
> 
> thank you very much for your tip, but in the variables list no variables of type „map" show up (please see attachment). But in print composter they are present and visible. 
> 
> Mit freundlichen Grüßen, 
> 
> Uwe Fischer 
> 
> VON: Qgis-user [mailto:qgis-user-bounces at lists.osgeo.org] IM AUFTRAG VON Martin Stubbs
> GESENDET: Donnerstag, 23. Juni 2016 12:46
> AN: qgis-user at lists.osgeo.org
> BETREFF: Re: [Qgis-user] Variables in print composer 
> 
> On 23/06/16 08:30, Uwe Fischer wrote: 
> 
>> Hello List, 
>> 
>> what is the use of variables in print composer? A map frame has variables assigned like map_extent_height and _width. But how to make use of those variables? If I try to place a rectangle around the map frame using the determined extent variables (plus something), I cannot use the variables. There is a ‚data defined override' section in the Position and size dialog for rectangles, but when I select ‚variable' it tells me that there are no variables, which seems to be nonsense. 
>> 
>> Best regards, Uwe
> 
> Uwe,
> 
> When you select a Data_defined_override in Position and size, pick edit from the list instead of variable. In the Expression string builder you will find map_extent_height in the Variables list.
> 
> Regards
> Martin
> 
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