[Qgis-user] Polygon from 4 points

[Raymond Nijssen]

Hi Ryan,

I think you could create a python QgsVectorDataProvider for your data 
and setup a QGIS server for hosting a wms.

https://www.itopen.it/qgis-vector-data-provider-python/

But I would probably just go for a simple script that converts the csv 
file into a polygon dataset (gpkg, shp, postgis, ..) and create a wms 
based on that.

Kind regards,
Raymond

On 26-11-2020 19:10, Ryan Peel wrote:
> Extending this thought a little.  Is there a way to create a WMS service 
> from this so that the WMS reads a csv file, automatically creates the 
> polygons using the expression that Toto recommended, so that it (on the 
> fly) creates the polygons from adding the WMS to a map so I can share 
> with my co-workers so that we are all using the updated data (rather 
> than having to share a shp file).
> 
> Long question, hoping for maybe an easy solution.
> 
> Ryan
> VB Fiber
> 
> On Thu, Nov 26, 2020 at 12:59 PM Ujaval Gandhi 
> <ujaval at spatialthoughts.com <mailto:ujaval at spatialthoughts.com>> wrote:
> 
>     Totò - really great solution! Didn't know about Geometry by
>     Expression and it will come in handy for sure.
>     Logo <https://spatialthoughts.com/>	
>     Ujaval Gandhi
>     Spatial Thoughts
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> 
>     On Thu, Nov 26, 2020 at 8:33 PM Totò Fiandaca
>     <pigrecoinfinito at gmail.com <mailto:pigrecoinfinito at gmail.com>> wrote:
> 
>          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 <mailto: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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