[Qgis-developer] Scripting QGIS from the outside using Python

[Nathan Woodrow]

Thanks Marco, that's pretty much what I needed.

- Nathan

On Mon, Mar 19, 2012 at 5:37 PM, Marco Hugentobler <
marco.hugentobler at sourcepole.ch> wrote:

>  Hi Nathan
>
>
> >What I have seen so far looks like you have to handle recreating the
> composer and all its items using the xml like in
>
> There has been some rearrangement in the composer classes (the first API
> break :-) ). With git master version, you should be able to create a
> QgsComposition by calling its readXML Method, then call
> QgsComposition::readItemsFromXML.
>
> The composer is a bit of a special case because it is possible to replace
> label strings, map extent / layer / rotation with parameters. And with the
> legend, there is a workaround to avoid using the x-server. So with an
> external python script, I'd recommend to use
> QgsComposition::readItemsFromXML.
>
> Regards,
> Marco
>
>
> On 19.03.2012 01:22, Nathan Woodrow wrote:
>
> Martin,
>
>  It's not so much that I don't know how to create a new composer from
> Python more that I don't now how to restore a composer item from the
> project file using Python.
>
>  I'm using the project file that contains composers as a template which I
> need to open and print.  What I have seen so far looks like you have to
> handle recreating the composer and all its items using the xml like in
> https://github.com/qgis/Quantum-GIS/blob/master/src/mapserver/qgsprojectparser.cpp
>
>  Maybe the composer object could do with a createFromXML() method which
> constructs a composer, and all its children, as per the project file.
>
>  - Nathan
>
> On Mon, Mar 19, 2012 at 4:51 AM, Martin Dobias <wonder.sk at gmail.com>wrote:
>
>> On Thu, Mar 15, 2012 at 2:29 PM, Nathan Woodrow <madmanwoo at gmail.com>
>> wrote:
>> > Is it possible to:
>> >
>> > Load QGIS from Python (well I know how to do this using
>> > QgsApplicaiton.Init())
>> > Open the project file
>> > Zoom to a location
>> > Print the first composer to pdf
>> > OR render out the map canvas to a image.
>>
>>  Hi Nathan
>>
>> yes that's all possible from an external python script with PyQGIS,
>> without actually starting GUI.
>>
>> > From what I can see the only way is to create a new composer item and
>> pass
>> > it the composer node from the xml.
>>
>>  No need to play with XML, everything can be done using API, there is
>> an example in the cookbook:
>> http://qgis.org/pyqgis-cookbook/composer.html
>>
>> Martin
>>
>
>
>
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>
> --
> Dr. Marco Hugentobler
> Sourcepole -  Linux & Open Source Solutions
> Churerstrasse 22, CH-8808 Pfäffikon SZ, Switzerlandmarco.hugentobler at sourcepole.ch http://www.sourcepole.ch
> Technical Advisor QGIS Project Steering Committee
>
>
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