I need to create a layout in which the vertices of the map in the layout coincide with the vertices of a rectangle of a grid that is oriented differently from the map on which it is overlayed: what can be the correct way to do it?
1 Answer
If by orientation you mean the map rotation you can use the 'Oriented minimum bounding box' tool on your polygon layer with the CRS of your basemap. It will create a field called 'angle'. You can then insert this angle using a custom expression in the map item properties in the 'map rotation' field. Since it is your atlas feature(probably) you can grab it by using the expression: "angle". You might have to use replace("angle",',','.') since map rotation only uses . as a delimiter.
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Sorry, updated comment:Thanks for Your answer. I tried, according to Your advice, with a single rectangle (map sheet): run the Oriented minimum bounding box tool from geoprocessing menu and grabbed the "angle" value (90.48xxxx) for the specific feature converted to -0.49 as rotation map value. Setting map extent using x, y min / x, y max I have a feedback value in the scale factor of 1: 9997 (instead of 1: 10000 as expected): it may be due to the different approximation (2 vs 6) between "map rotation field" and the value of the "angle" field? Sep 20, 2018 at 18:02
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I was having the same problem with the scale not fitting the actual desired/given one. My maps were fixed at 25000 and all varied by +/-50. I don't know why but I guess it might be,as you mentioned, because of the map rotation only taking 2 characters after the comma OR maybe because of CRS issues. I decided to stick with the small scale variations since they were so little. Sep 21, 2018 at 6:17