Python bindings for QuantumGIS (QGIS)
2
votes
2answers
206 views
How to show a message box in QGIS?
I am starting to develop a plugin for Qgis using python, which i am very new at, and would like to view some results of variables by displaying a message in QGIS. How can I do this?
4
votes
2answers
151 views
How to iterate over selected layers?
In QGis by pressing shift or ctrl keys a user can select multiple layers in toc.
How can a python script iterate over selected layers?
I'd expect a iface.selectedLayers() but I can find only ...
2
votes
1answer
128 views
Can I Dynamically Update Symbol Ranges?
Background: I'm currently trying to dynamically change the ranges for a layer with new style graduated symbology.
Problem: I thought it may be as simple as updating the ranges for the existing ...
1
vote
2answers
103 views
How to do a spatial search without select() using PyQGIS?
Using QGIS 1.9.0-master, I want to do a spatial search for features in a vector layer without selecting them, i.e., without using QgsVectorLayer.select(), QgsVectorLayer.selectedFeatures() et al.
...
1
vote
1answer
91 views
Count the number of symbols in a 'new symbology' renderer from pyqgis
Background : I create a lot of symbology using 'saturation' ramps - for want of a better term, e.g. where the hue and value of each symbol stays the same, but the saturation changes. I couldn't figure ...
1
vote
0answers
43 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()
...
3
votes
1answer
216 views
Get extents of vector shape features in python
i am just wondering if it is possible to iterate through vector features and return the extent per feature without clipping the vector shape?
The code looks like this and comes from the ...
3
votes
1answer
194 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
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 ...
2
votes
1answer
165 views
Is it possible to programmatically add calculated fields?
In the Memory provider described in PyQGIS Cookbook or in question How to create a new empty vector layer programmatically? I can see how to create a vector layer programmatically using standard ...
1
vote
2answers
145 views
Cannot get changeAttributeValues() to work in a loop
I'm trying to use QGIS to loop through a set of points, find their elevation from a DEM and use that value to update the point layer's attribute table. The loop works fine until I try to use ...
2
votes
2answers
225 views
How do I get the path of a project, or layer file in PyQGIS?
I am generating new raster files from vector layers on a project. I would like to save them in the same directory as the project or layer files. How do I find this path using PyQGIS?
1
vote
0answers
133 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
1answer
210 views
how to get the projection from a vectorlayer in qgis?
Hi I am trying to set the projection on a raster to match that of a vector point layer. Thus I need to findout what is the projection of a give layer, to use it in the GDAL.Dataset.SetProjection() so ...
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 ...
4
votes
1answer
175 views
How to Create a raster layer from a numpy array using pyqgis?
I am working on a plugin for Qgis to calculate spatial Kernel density maps. I have all the calculations working, all I am missing is a way to turn a Numpy Array, with density values into a multiband ...
2
votes
1answer
389 views
QGIS: How to load feature (.qml) styles from python? [duplicate]
Possible Duplicate:
How to style a layer from console?
I'm trying to set the styles for a vector layer by loading the .qml file in the python console. The qml-style file contains all ...
2
votes
1answer
130 views
Is it possible to set a layer style (e.g. set the color ramp) before loading the layer using pyQGIS?
I am implementing a tool which allows an user to calculate some statistics with some data from the registration office. My question is, can I set some layer styles using pyQGIS?
The analysis part is ...
2
votes
1answer
264 views
How to split geometry collection into its items using Python and QGIS API?
I'm getting some geometries via intersecting lines by polygons (somewhat blindly - I don't really know if intersection exists and actually I don't need to know) using python and QGIS API: ...
0
votes
0answers
29 views
How to apply a symbology stored in a qml file? [duplicate]
Possible Duplicate:
How to style a layer from console?
I'm writing a plugin for QGIS and I want to apply a symbology (rules) stored in a QML file.
And I don't know how to do that :-/
...
0
votes
1answer
329 views
pyqgis: How to get features of selected geometries
I wonder if anybody could provide an example how to get the attributes of selected Features?
I tried the folowing Code in the python Console - but I'm stuck at the point where I'd like to get the ...
1
vote
1answer
117 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?
2
votes
1answer
166 views
Is there an itemSelectionChanged Signal in Attribute Table?
The QgsVectorLayer class emits a selectionChanged() signal . If a QGIS user for example selects a record in the Attribute Table of a Vector Layer - a selectionChanged() signal is emitted an can be ...
3
votes
0answers
396 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, ...
0
votes
0answers
187 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 ...
3
votes
1answer
400 views
How can i obtain the data of one selected feature in QGIS using python?
I have a problem / question regarding python and QGIS. Is it, and yes how, possible to get the data of one selected feature in QGIS using python?
In my example I have a layer which shows some parcels ...
6
votes
1answer
517 views
When iterating over a vector layer with pyqgis, how do I check whether a feature is selected?
While iterating over a vector layer using the following code (summerized from the example in the pyqgis cookbook), is there a way to check whether a feature is selected?
provider = ...
6
votes
1answer
324 views
How to add a toolbar via python?
Through tutorials I learned how to add a toolbutton to the plugins-toolbar via python. Now I wonder how to add a complete toolbar with toolbarbuttons via python.
Can anybody give some example-code?
...
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 ...
0
votes
0answers
95 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 ...
6
votes
1answer
911 views
How to create a new empty vector layer programmatically?
I am new to python and QGIS. I have looked at a few tutorials of python scripts for QGIS. All of them create new vector and raster layers with some existing data source. eg. shapefile or geotiff or ...
2
votes
0answers
353 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
232 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 += ...
0
votes
1answer
396 views
Is getting wrong attribute values from a feature in qgis
I make two polylines features(in my example both consists of two points) with the add feature tool. Then I (with code) add some attribute values on the first feature, then changes the geometry of the ...
2
votes
1answer
66 views
Which class should I use to work with vector layers?
I'm doing different operations on vector layers.
Kindly suggest which class should I use for vector layer i.e QgsVectorLayer or QgsVectorLayerDataProvider.
1
vote
1answer
217 views
How to get a signal when the geometry to a line in QGIS is changed
I am working on a plugin in QGIS and want to get a signal when the geometry to a feature(in this case a polyline) in my layer is changed. For example if I use the node tool to drag one of the nodes.
...
1
vote
0answers
24 views
qgis.core error [duplicate]
Possible Duplicate:
qgis.core import error
I am new in quantum gis and python,
I installed quantum gis 1.8 from osgeo4w installer, after I installed python 2.7 and started python shell and ...
3
votes
2answers
167 views
How do I specify the position, style and units of the ScaleBar in pyqgis?
I would like to add a scale bar to my composition using the python console and then export it to a raster image.
I am following the MapRendering tutorial with the "output using map composer " approach
...
2
votes
1answer
248 views
How to load a postgres view using pyQgis?
Under Qgis 1.8 on Windows 7 I have this problem with my pyArchInit plugin: I need to load on the map canvas my geometries from a postgis layer. Till the 1.7.4 version I use the method explained on the ...
7
votes
4answers
621 views
How to run sextante algorithms outside of qgis python console?
I'm kind of stuck trying to figure out the way to run sextante from a standalone python from OSGeo4W distribution. The reason I want to do this is that I got tired entering parameters in the dialog ...
2
votes
1answer
398 views
qgis.core import error
I would want to use the Qgis api for custom desktop application. When I imported the qgis.core module, I get the following error
>>> import qgis.core
Traceback (most recent call last):
...
1
vote
0answers
135 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
2answers
438 views
Problem loading vector layer (pyQGIS)
I've installed the qgis on ubuntu 12.04 following the instructions on http://hub.qgis.org/projects/quantum-gis/wiki/Download. I am trying to test the Python API and try to do the follwoing
from ...
1
vote
1answer
130 views
How can i include program form (created in Designer ) to my QGIS plugin?
How can I include a form created in Designer in my QGIS plugin?
And how to get controls values (textbox,label,etc)?
2
votes
1answer
501 views
How can I add button to the QGIS toolbox or create my own toolbox?
I want to create a button and add it to the QGIS toolbox or alternatively create my own toolbox and add the button here.
A plugin should be started when the user clicks the button.
2
votes
1answer
89 views
Can't load PYQGIS
I get this error; any comments
Couldn't load PyQGIS.
Python support will be disabled.
Traceback (most recent call last):
File "", line 1, in
ImportError: ...
2
votes
2answers
389 views
How can I specify the CRS of a raster layer in pyqgis?
I manipulating netcdf raster data from the QGIS python console.
The metadata of my netcdf file does not provide the Reference system. However I know it is 'EPSG:4326'
I am writing a python script to ...
3
votes
1answer
308 views
Changing attribute data types using PyQGIS
OK, so I've already asked a question how to access attribute data types when developing plugin for QGIS, using PyQGIS. And one helpful member said i should use pendingFields() method on the current ...
3
votes
1answer
102 views
How to display a particular area?
Hy,
I'm developing a plugin in python for Qgis.
I would like the user to select a particular area in a list (let say a country list) and zoom in the map on the corresponding area.
Actually I'm ...
