Hi Even
Ok, so it seems to depend on the format properties.
Hi Even
You are right, it seems to depend on the output driver/format. Actually
my main interest is the dxf format, it seems that one takes the first
element of the style. Don't know if there are drivers which handle
multiple pens / brushes. So probably I'll write everything into the
style string and let the driver do what's best for the concrete format.
Thanks,
Marco
On 10.12.2012 15:29, Even Rouault wrote:
Selon Marco Hugentobler <[email protected]>:
Hi
I'm currently implementing support for OGR feature styles in the QGIS
vector layer export. In QGIS symbology, there is the possibility to
compose a symbol with multiple symbol layers, e.g. a broad black line
with a thin white line on top of it for a road symbol. Is this supported
by the OGR feature styles to have multiple pens / brushes in the same
symbol string?
I tried the style string
'PEN(c:#008000,w:3mm,l:1);PEN(c:#ff0000,w:2mm,l:2)'. However, in a kml
export, only the first style seems to be picked up. So I wonder if there
is something wrong with my style string or if it is not supported by the
feature style mechanism.
Marco,
I was surprised that multiple pens were allowed, but yes, there doesn't seem to
be any limitation on multiple instanciations of the same style tool in the spec
or the generic code of the OGR FeatureStyle implementation. However I'd be
surprised that many drivers (and formats) can handle that properly.
Looking at addstylestring2kml() in ogr/ogrsf_frmts/libkml/ogrlibkmlstyle.cpp, I
can see that only one PEN instance will be taken into account (looking at the
coulde, I would have said that it would be the last occurence...). And it seems
that it is a limitation of LIBKML itself, since the Style class seems to accept
only one line style.
http://code.google.com/searchframe#y2CS_eJ3ink/trunk/src/kml/dom/style.h&q=style.h%20package:libkml\.googlecode\.com
Best regards,
Even
--
Dr. Marco Hugentobler
Sourcepole - Linux & Open Source Solutions
Weberstrasse 5, CH-8004 Zürich, Switzerland
[email protected] http://www.sourcepole.ch
Technical Advisor QGIS Project Steering Committee
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