[Qgis-developer] QGIS Framework for web and online shapefile viewer

[Marco Hugentobler]

Hi Mohammed

Yes, it is possible to do rendering with QGIS independent of GUI. You could 
take a look at the code for the server in qgis trunk (in the src/mapserver 
directory). Basically you use QgsMapRenderer, add the layers to it and render 
into a Qt paint device (usually QImage for GUI independant tasks).

> does QGIS can be used as a framework in our application?

I hope so. Please also consider that the QGIS libraries are GPL license ( not 
LGPL ).

Regards,
Marco

Am Freitag, 4. Februar 2011, um 13.55:33 schrieb Mohammed Rashad:
> Hi all,
> 
> How to use QGIS as a framework to develop desktop based gis application
> changing the gui part(qt4_gui) and reusing qtcore, network xml and other
> libs.
> 
> here is an online shapefile viewer which I had done reading shapefile using
> OGR and rendered using Wt.
> http://lsi.iiit.ac.in/lsi/shpviewer/
> Here the shapefile is directly rendered without mapserver or anything. only
> library we used is GDAL and rendering is done by Wt
> 
> Please check it. for testing we have demo data attached with this mail. you
> can also try your own data.
> 
> Now I am coming to the point.
> Till now we have not used any code from QGIS.
> 
> but we tried creating and layer and checking it if it is valid. upto that
> extent we can reuse QGIS Code.
> 
> this code works on web and prints a "Layer is valid"
> 
>   QgsVectorLayer * mypLayer = new QgsVectorLayer("/home/rashadkm/data",
> "point_data", myProviderName);
> 
> 
>   if (mypLayer->isValid())
>     cout << "Layer is valid" << endl;
>   else
>     cout <<"Layer is NOT valid" << endl;
> 
> 
> So My question is
> does QGIS can be used as a framework in our application?
> In QGIS code is seperated as gui core etc..
> so for starting the work keeping QGIS as a backend we need minimal gui code
> which display a vector (or just shapefiles).
> 
> If someone can help me with this I can do the rest of coding needed for Wt
> Only I need is a very minimal source code and files which can do rendering
> in Qt.
> 
> 
> Looking forward your comments and suggestions.
> 
> rashadkm * gmail [dot] com


-- 
Dr. Marco Hugentobler
Sourcepole -  Linux & Open Source Solutions
Churerstrasse 22, CH-8808 Pfäffikon SZ, Switzerland
marco.hugentobler at sourcepole.ch http://www.sourcepole.ch
Technical Advisor QGIS Project Steering Committee