[Qgis-user] Composer Atlas: How get rid of the big red cross when there is no image?

[Bernd Vogelgesang]

Am 26.10.2016, 22:57 Uhr, schrieb Nyall Dawson <nyall.dawson at gmail.com>:

>
> On 27 Oct 2016 6:51 AM, "Bernd Vogelgesang" <bernd.vogelgesang at gmx.de>  
> wrote:
>>
>> Arghh, sorry for the noise!
>>
>> When hovering over the data-driven input button not so hectically, I  
>> discovered the explanation that it expects a 0 or 1.
>> So
>> case when'mypath'|| @atlas_pagename ||'_1.jpeg' IS NULL
>> THEN
>> 0
>> END
>>
>> did the trick!
>
> This is odd... A null picture expression should be rendered empty, not  
> as the red cross. The red cross is intended only as an >obnoxious,  
> obvious indicator that a picture path was set but couldn't be found.
>
> The expression above would only result in 0 if @atlas_pagename is null.
>
> Nyall

Well, yeah, I was too early to announce the solution. In fact this did not  
render the missing image, but also not the one which is there :(

case when
'/media/Daten/IVL_Projekte/2016024_Feldhamster_NEA/2_EINGANG_MA/Bernd/QGIS/Fotos/'||  
@atlas_pagename ||'_1.jpeg' IS NULL
THEN
1
ELSE
0
END

This should do it. But now I am again where is started: When the image is  
there, it is rendered, when not, the red cross is exported as well.

:(

Bernd

>
>
>>
>> Just amazing!!!
>> Thanx
>> Bernd
>>
>> Am 26.10.2016, 22:19 Uhr, schrieb DelazJ <delazj at gmail.com>:
>>
>>> Hi,
>>> what about using the data-defined option near the "Exclude items from  
>>> export" in the items properties --> Rendering (with a case >when  
>>> expression)?
>>> http://docs.qgis.org/2.14/en/docs/user_manual/print_composer/composer_items/composer_items_options.html#rendering-mode
>>>
>>> HTH,
>>> Harrissou
>>>
>>> 2016-10-26 22:10 GMT+02:00 Bernd Vogelgesang  
>>> <bernd.vogelgesang at gmx.de>:
>>>>
>>>> Hi,
>>>> I set up a neat atlas for displaying a row of 50 sample plots. On a  
>>>> second page, I want to show 2 pictures taken of these plots  
>>>> >automatically with an expression including the path ||  
>>>> @atlas_pagenumber || '_1.jpeg' or '_2.jpeg' to display up to two  
>>>> photos named >e.g. 1_1.jpeg, 1_2.jpeg.
>>>>
>>>> This works really great! The problem is, that for some plots, we do  
>>>> not and have any picture or only one. In composer, these >missing  
>>>> images are marked with a big red cross.
>>>> Unfortunately, these red crosses are also exported, which looks quite  
>>>> shitty.
>>>>
>>>> Is there any clever way of forcing QGIS not to export these place  
>>>> holders but just not to print anything at this place?
>>>>
>>>> The only (boring) idea I came up with till now, was to create empty  
>>>> white images and name them accordingly to avoid the red >crosses.
>>>>
>>>> Thanx
>>>> Bernd
>>>>
>>>> --Bernd Vogelgesang
>>>> Siedlerstraße 2
>>>> 91083 Baiersdorf/Igelsdorf
>>>> Tel: 09133-825374
>>>> _______________________________________________
>>>> Qgis-user mailing list
>>>> Qgis-user at lists.osgeo.org
>>>> List info: http://lists.osgeo.org/mailman/listinfo/qgis-user
>>>> Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user
>>>
>>>
>>
>>
>>
>> --
>> Bernd Vogelgesang
>> Siedlerstraße 2
>> 91083 Baiersdorf/Igelsdorf
>> Tel: 09133-825374
>>
>> _______________________________________________
>> Qgis-user mailing list
>> Qgis-user at lists.osgeo.org
>> List info: http://lists.osgeo.org/mailman/listinfo/qgis-user
>> Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user



-- 
Bernd Vogelgesang
Siedlerstraße 2
91083 Baiersdorf/Igelsdorf
Tel: 09133-825374
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-user/attachments/20161026/45294731/attachment.html>