Is it possible to rotate each individual atlas detail map separately?
In creating an atlas for a long linear feature (rivers) to be output in engineering-style pages (11 x 17), it is nice to include as much and as consistent of an amount of the linear feature in each separate detail map as possible. Having the map oriented to N is not a particular priority. I understand how to rotate my whole canvas in the main app, and how to rotate a map rectangle within composer, but neither of these addresses the goal exactly.
My use case example is below. Each yellow polygon covers a 15 miles section of river. I want to rotate each atlas panel to 'flat' according to the bottom of the polygon, so that in each panel the visible river feature extent will be as-wide horizontally as possible.