Might generalizing the lines (Poiker Douglas or similar) yield four line rectangles?
On Thu, Feb 3, 2022, 23:44 Etienne Trimaille <etienne.trimai...@gmail.com> wrote: > Maybe "oriented_bbox" to get first a proper rectangle ? > > https://docs.qgis.org/testing/en/docs/user_manual/expressions/functions_list.html#oriented-bbox > > But then, you might have some tiny leftover. It depends if you care or not. > > Otherwise, you need to use the angle at each points. > > I thought there is the longest line possible within a polygon, but I can't > find it. I did it manually a few years ago. > > Le jeu. 3 févr. 2022 à 23:29, Dario C <dario9...@gmail.com> a écrit : > >> Hi, >> I have several rectangles (almost squared) and I'd like to represent >> their diagonals. >> >> I started to do with geometry generator with: >> make_line(point_n($geometry,1),point_n($geometry,4)) >> and >> make_line(point_n($geometry,2),point_n($geometry,5)) >> >> Unfortunately, even if they look rectangular, actually they have more >> then 4 points and, moreover, points do not always have the same order. >> >> here below an example: >> [image: image.png] >> >> Is there any expression in order to pick the two longest segments >> connecting all the points of the geometry? >> >> >> Thanks >> _______________________________________________ >> Qgis-user mailing list >> Qgis-user@lists.osgeo.org >> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user >> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user >> > _______________________________________________ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user >
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