[Qgis-developer] Listener for Atlas Change Page

[Nyall Dawson]

On 13 Dec 2016 4:44 PM, "Shawn Tse" <shawntse at gmail.com> wrote:

Hi all,

I'm interested in being able to make graphs that update depending on
what the active feature in the atlas is. I know some python and a
little bit of the QGIS API, but I'm curious - is there some sort of
listener function for the atlas that gets called whenever the Preview
Atlas/Prev Feature/Next Feature/First Feature/Last Feature buttons are
pressed?


Try QgsAtlasComposition::featureChanged. See
https://qgis.org/api/classQgsAtlasComposition.html#ab1a15fdb6d20ebb1254ebb6714254fac

Nyall


What I eventually want to do is to manipulate the node items that were
created in a recent updated version of QGIS, and use them to make a
line graph, gridlines, etc.

I'm hoping to draw the data directly from the shapefiles themselves or
from a .csv file.

I originally tried to use an expression in a text box to do this, but
it seems that expressions are unable to use custom functions to
manipulate the composer. So I'm hoping that there's some sort of
Listener method.

Thanks.
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