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In QGIS, I represent a polygon of the El Niño regions on the Pacific Ocean, as seen below:
Now, what I need is that the regions of Oceania and East Asia are shown on the left side of the map, similar to this image:
The shapefile of continents does not repeat itself, so how could it be done? The idea is to avoid the use of secondary images like the OpenLayers plugin.
A workaround below :
Duplicate the "world" layer. Layer Menu > Duplicate layer (or right-click on the layer)
Go to the duplicated layer properties. Layer Menu > Layer properties (or right-click on the layer, and by default, double-click on the layer)
In the symbology tab, as symbol type, choose Geometry generator (doc link)
Leave the Polygon / Multi-polygon symbol type and enter the formula :
translate($geometry, -360, 0)
Give the same symbology to both layers and remove if necessary the borders (conflict for Antarctica, Fiji islands and Russia)
I assume there is no projection and coordinates are in degrees, but it's work even with a projection, just replace the -360 part by the correct distance.
