I am trying to make a pie chart that only compares feature attributes of the features in the current extent. My first approach was to make a python function that returned the current extent as a polygon and use that returns with the within function. Unfortunately the python function only returns an extent if I go in and click the load button. If I move the extent I have to reload the python script to get my new extent. This wont work well for my purposes, so now I am thinking about a virtual layer as an attribute table that only contains features in the current extent. Has anyone done something similar with a virtual layer that could help me, I cannot find an sql command that returns the map canvas. My data is in postgresql. Thanks; Tyler
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