2016-10-26 22:36 GMT+02:00 Bernd Vogelgesang <[email protected]>:
> Hi Harrissou, > thanx for the hint. I already saw the checkbox, but had no idea what to do > with it. > > My problem now is, that I have really no idea what to put in the "case > when" > Maybe something like > '/mypath/'|| @atlas_pagename ||'_1.jpeg' IS NULL or so? > > I do not know what is expected to be returned that this option will > trigger. There seems not to be a boolean type or so. The documentation does > not tell what to do there. > > If you click the data-defined button, the description menu explains what is expected; in this case a boolean so, though not tested, I'd say case when '/mypath/'|| @atlas_pagename ||'_1.jpeg' IS NULL then 1 else 0 end (or perhaps inverse 1 and 0) Still confused, but there might be a solution... > > Bernd > > Am 26.10.2016, 22:19 Uhr, schrieb DelazJ <[email protected]>: > > 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 <[email protected]>: > >> 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 >> [email protected] >> 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 >
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