[Qgis-user] Polygon from 4 points

[Nicolas Cadieux]

Hi,

I’m the field calculator, you could also update the <geometry> field using wkt.  If this was a line, you would use 
> 
> Geom_from_wkt('LINESTRING (' ||  "x1"  || ' ' ||  "y1"  || ',' ||  "x2"  || ' ' ||  "y2"  || ')')
> 


Google wiki and WKT geometry and you will see how you could make a point, line, polygon...  you could also use this same syntax in a csv and import the csv.

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 26 nov. 2020 à 10:03, Totò Fiandaca <pigrecoinfinito at gmail.com> a écrit :
> 
> From Processing:
> 
> search for Geometry by Expression:
> 1. as input layer put your file with the coordinates
> 2. and write this expression:
> 
>   make_polygon (
>   make_line (
>   make_point ("x1", "y1"),
>   make_point ("x2", "y2"),
>   make_point ("x3", "y3"),
>   make_point ("x4", "y4")
>   ))
> 
> and launch the geoprocess.
> 
> I used QGIS 3.16 Hannover
> 
> Il giorno gio 26 nov 2020 alle ore 15:48 Ryan Peel <ryanpeel at gmail.com> ha scritto:
>> I have a csv/table that has a single row that contains some metadata as well as four SEPARATE columns, x1, y1, x2, y2, x3, y3, x4, y4 of decimal degree coordinates.
>> 
>> I want to import all of this data into QGIS and create a polygon from the four points as a vector layer.  
>> 
>> What is the best way to do this?  I'm not a programmer or scripter really and fairly new to QGIS.  
>> 
>> Thanks!
>> 
>> 
>> Ryan Peel
>> 
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