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There is a polygon geometry in my QGIS project which represents the extents of my map. Does anybody know how to use the data defined override to get the X/Y min and X/Y max coordinates of the polygon in the print composer?

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Unfortunately this isn't working:

xmin(attribute(getFeature('layername', 'gid', 1), 'geom'))
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The geometry can be accessed directly rather than through the attributes:

x_min(geometry(getFeature('airports', 'cat', 1)))
  • Yeah, works fine using 'xmin' instead of 'x_min'! – Lunar Sea Jun 7 '15 at 19:40

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