[Qgis-developer] qgis web

[Mohammed Rashad]

On Sun, Feb 13, 2011 at 4:36 PM, Richard Duivenvoorde
<rdmailings at duif.net>wrote:

> Mohammed Rashad wrote:
>
>> How to render a shapefile to an image file so that it can be reused on a
>> web page.
>> Anyone please send a me a minimal code or tell me where and what to
>> modify. I looked src/mapserver folder but I cant get the code for it
>>
>> Atleast please tell me the file to modify to render a vector file(shape)
>> to an image file
>>
>
> Hi,
>
> you're not very clear what exactly you want.
>
I am trying to build an online shapefile viewer using qgis as a backend. for
that i need to render qgis output to a image(.png) file
I cannot use QgsMapCanvas class because it requires QApplication I cannot
use any class from qgis_gui
but qgis_core can be used.


 QgsVectorLayer * mypLayer = new QgsVectorLayer(myLayerPath,
myLayerBaseName, myProviderName);
  QgsSingleSymbolRenderer *mypRenderer = new
QgsSingleSymbolRenderer(mypLayer->geometryType());
  QList<QgsMapCanvasLayer> myLayerSet;
  mypLayer->setRenderer(mypRenderer);

  if (mypLayer->isValid())
  {
    cout << "Layer is valid";
  }
  else
  {
    cout << "Layer is NOT valid";
    return;
  }

the following code works for me in Wt. It prints layer is valid or invalid
according to the parameters to QgsVectorLayer()
can I set mypLayer->setRenderer of the above code to an image file so that
rendering occurs on a image file of my choice?

It hope now the problem is clear.Now can you help me?



>
> But, if you want a one time imagefile of a map from a shapefile, use 'Save
> as Image' from the File menu.
>
> If you want to do some python coding for a plugin, please have a look in to
> for example the "Html Image Map plugin", that one saves an image from
> current map. Minimal code from Python console in a running qgis:
>
> qgis.utils.iface.mapCanvas().saveAsImage("/tmp/mymap.png")
>
> If you want a server process generating maps from the (changing?)
> shapefile, you need a WMS (Web Mapping Server). You can use QGIS mapserver
> for that: http://karlinapp.ethz.ch/qgis_wms/. But even more famous ones
> like Minnesote Mapserver (mapserver.org), or Geoserver (geoserver.org).
>
>
> Regards,
>
> Richard Duivenvoorde
>



-- 
Thanks && Regards
Rashad
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