Python bindings for QuantumGIS (QGIS)
3
votes
1answer
186 views
Creating Selection MapTool in PyQgis Custom Application
I'm developing a custom GIS application using PyQgis API.
How can I let the user select features on the map using Maptools? I would like to replicate the select feature there in Qgis to make the ...
1
vote
1answer
380 views
rpy2 installation ERROR “Tried to guess R's HOME but no R command in the PATH”?
I tried to install rpy2 (pip install rpy2). I want to use the SDAPP4 extension with QGIS (QGIS shows up the message missing rpy2...). The system tells me always the same error: Tried to guess R's HOME ...
1
vote
1answer
116 views
Color depending on attribute
I'm trying to set the color of a vectorlayer feature depending on the feature attributes with PyQGIS. How do you acces the attributes of a vectorlayer feature?
0
votes
1answer
50 views
How to save after using fet.setFeatureId in pyQGIS?
By using the following code, I want to change the id of the line when saving the line. But the setFeatureId command, gives a false when doing the commitChanges(). Any idea how to change the id?
vl = ...
3
votes
0answers
392 views
How to find all intersections and count lines arriving at each intersection?
I'm having a hard time getting off the ground with this, and am trying to move away from ArcGIS / arcpy.
I have a shapefile with a network of polylines. I want to find/count all 2-way intersections, ...
2
votes
0answers
48 views
Python Script that calls the Voronoi Polygons Function?
I've been looking to see if there was a way to call Voronoi Polygons function found in Vector/Geometry Tools, directly from the code but I have not found one. Does this currently exist? Is there a way ...
2
votes
0answers
349 views
legend groups and layer position/order qgis 1.8
I'm tring to programmatically create layer sequence also using groups.
Simple python code:
layer = QgsVectorLayer("004cp000.shp", "004cp000", "ogr")
QgsMapLayerRegistry.instance().addMapLayer(layer)
...
1
vote
0answers
51 views
How to delete a point with known coordinates in python?
I was wondering if there is a piece of code that does the opposite that setGeometry does and removes a point if there is one at x and y coordinates?
1
vote
0answers
117 views
DLL problem with PyQGIS
I am having problems with Python Shell importing the module "qgis.core".
When I type "import qgis.core" the Shell ("idle.pyw") gives me this error:
Traceback (most recent call last):
File ...
1
vote
0answers
157 views
How to debug 'Layer is not valid error' from Python plugin?
I'm trying to understand what goes wrong with a QGIS python plugin.
Basically I'm trying to render a series of POINT.
The query works fine, at least giving it by hand from inside PostGIS DB:
"SELECT ...
1
vote
0answers
42 views
What is the proper way to do an automatic rollback of a vector layer edit?
I'm trying to rollback automatically the changes in features of a in-memory vector layer that don't meet certain criteria.
The code I'm using for testing looks like this:
...
def some_function()
...
1
vote
0answers
97 views
Is there any python function to rotate map layers?
Is there any python function allowing a user to rotate map layers in the map canvas. If so, could you please point this out for me?
I want to rotate a map layer, using a factor of rotation in ...
1
vote
0answers
128 views
Qgis Plugin development with postgres data
can someone help me with initial developing on qgis plugin that displays postgres data table on a QTTableView or QTTableWidget?
So far:
I can connect to database using psycopg2 or using ...
1
vote
0answers
52 views
SVG markers with PyQGIS
How do you SVG-marker layers in PyQGIS? I'm importing a vector layer and want to display it with SVG-markers.
It seems that QgsSvgMarkerSymbolLayerV2 does not exist in PyQGIS...
1
vote
0answers
141 views
no module named core
Hi I am trying to access and use QGIS modules/class/methods from IDLE on a mac. I have had the same problem as a few other people, and browsing the forums have tried to follow the advice they have ...
1
vote
0answers
227 views
How to change feature's geometry?
Hy,
I'm creating my layer like this:
crs = core.QgsCoordinateReferenceSystem(4326, core.QgsCoordinateReferenceSystem.EpsgCrsId)
uri = "Polygon"
uri += '?crs=' + crs.authid()
uri += ...
1
vote
0answers
132 views
QGIS Updating composer label text via python - problem with Item Properties panel
I am writing a plugin that replaces the text of a composer label based on its itemID.
When I change the text of the label using:
item.setText("Hello World")
the label changes on the composer but ...
1
vote
0answers
72 views
Setting border-style to 'no pen' using QgsGraduatedSymbolRendererV2
I am developing a QGIS plugin that, after a series of inputs, will produce a thematic map using the QgsGraduatedSymbolRendererV2. Because the polygon are very small, the boarders make it such that ...
0
votes
0answers
42 views
qgis python app how to add edit feature button?
I'd like to develop a QGIS Python app for plotting points and editing the attributes. I've started with the tutorials here: http://blog.qgis.org/?q=node/59 and read the cookbook ...
0
votes
0answers
42 views
How to begin with tool development for GRASS gis or QGIS GRASS
I wanted to begin with customized tool development in Grass GIS or QGIS grass. How should i begin in to develop the tool. I search a lot in google search engine for begin with tool development in ...
0
votes
0answers
101 views
how to plot point on openlayer google street layer programmatically
I want to plot points on google street layer using python programming and postgresql database.
Mainly I want to extract data from database and plot it on the google street layer on Quantum GIS 1.8 ...
0
votes
0answers
36 views
Associate media to gpx vector layer from Python Console
Essentially, I would like to have the description in the form of text annotations when i hover my mouse over the gps entry. And if i click the same, it should display the images.
So I started off by ...
0
votes
0answers
99 views
QGIS python console projection transformation
I need to write a python console script in QGIS to do the following:
1) convert a simple KMZ to a shape file format
2) reproject from WGS84 to British Grid (OSGB_1936)
This is to automate the 2 steps ...
0
votes
0answers
182 views
Qgis python plugins development with Eclipse
I'm using Eclipse's PyDev extension to develop python plugins for Qgis.
I did the required configs for the interpreter in Eclipse to be able to use python.
When I start a PyDev project, all the Python ...
0
votes
0answers
94 views
How to build QGIS with Python on Redhat?
I'm attempting to run QGIS on Redhat 5 64 bit architecture. Version of Python is 2.4.3. Version of QGIS is 1.7.4 (wroclaw).
When I run qgis, the splash screen appears, followed by a QMessageBox that ...
