[GIS] Qgis Python code library documenation.

pythonqgis

I'm looking for python documentation for specific operations in the Qgis python console. I know there is no suggestions simular to Arcpy but I would like a pure list of operation code lines as "layer.featureCount()"

Or is this taken from python standard librarys?

Best Answer

I find the cookbook below is a great start, although it doesn't cover everything.
PyQGIS Developer Cookbook: http://www.qgis.org/pyqgis-cookbook/
To go in deeper you need the QGIS API documentation: http://doc.qgis.org/api/ though this is pretty limited in explanation and is directed at C++ programmers. By comparing the API information with the cookbook examples, you can get the hang of the transformations needed to move from C++ to python usage. One of the difficulties in using QGIS plugins is lack of documentation - you have to invest a lot of time on the learning curve, I don't think there is any real shortcut at the moment.

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I don't know about GAE compatibility, but you migh try SymPy for pure math & geometry functions. Otherwise, the only other one I know about is Shapely but it has a libgeos_c dependency which might disqualify it based on your requirements.

UPDATE: Also SymPy is BSD licensed, which might be an important benefit to some devs.

[GIS] How to hide/show QGisVectorLayer from Python code

You can control the layer visibility through the legend object. Here it is, using your sample code above:

aLayer = self.addVectorLayer(uri.uri(), layerName, self.dbConn.getProviderName())
legend = self.legendInterface()  # access the legend
legend.setLayerVisible(aLayer, False)  # hide the layer
# do something else
legend.setLayerVisible(aLayer, True)  # show the layer

# maybe later I want to check if the layer is visible
print legend.isLayerVisible(aLayer)

Here's the documentation for legendInterface: http://qgis.org/api/classQgsLegendInterface.html

Good luck!

Best Answer

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Python Geometry Operations – Best Pure Python Libraries

[GIS] How to hide/show QGisVectorLayer from Python code

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