[Qgis-developer] Symbology export in save as feature

[Yves Jacolin]

Andreas,

Thanks for you explenation. I added some of your description in the 
documentation.

Y.
On Friday, June 24, 2016 11:15:45 Neumann, Andreas wrote:
> Hi Yves,
> 
> This has mainly "historic" reasons.
> 
> It was introduced specifically when saving QGIS layers to DXF through
> OGR. I believe also the KML export is affected to some extent.
> 
> Our first attempt to export QGIS layer to DXF went through OGR with OGR
> feature  - however, this was too limited, and it was abandoned.
> 
> "No symbology" means, simple black default lines
> 
> "Feature symbology" means "Save with OGR Feature Styles"
> 
> "Symbol Layer symbology" means "Save with OGR Feature Styles but export
> the same geometry multiple times if there are multiple symbology symbol
> layers used"
> 
> Meanwhile the DXF export from QGIS goes through a native DXF writer -
> without OGR, so the above approach was abandoned and hasn't been worked
> on for some years now.
> 
> -------------------------
> 
> I hope this explains what it does, but as I said it is limited for
> export to DXF/KML or potentially formats that support OGR feature styles
> - formats that can handle styles.
> 
> For QGIS 3.0 I see the following ways to get rid of this:
> 
> 1. keep it but improve it (unlikely)
> 
> 2. hide it for layers that don't support OGR feature styles (can be
> combined with 1.)
> 
> 3. get rid of it completely (my preferred option if 1. does not happen)
> 
> BTW: 2. could probably be done for QGIS 2.16 and 2.14 already, to have
> fewer confused users ...
> 
> Hope this explains it.
> 
> What do others think?
> 
> Andreas
> 
> On 2016-06-24 10:43, Yves Jacolin wrote
> 
> > Hello,
> > 
> > Working in the "save as ..." feature documentation I wondering what
> > "Symbology export" parameters mean. There are 3 possibilities: "No
> > symbology", "Feature symbology" and "Symbol layer symbology".
> > 
> > Any idea what does it mean?
> > 
> > Thanks,
> > 
> > Y.
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