Python bindings for QGIS.

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21 views

QGIS canvas refresh & rendering control from plugin?

Plugin Description I have been working on a plugin which essentially doing the same as "GPS information" live tracking but with capability of displaying two GPS streams. I am comparing streams and ...
1
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1answer
20 views

How to integrate Live layer effect in QGIS 2.10 with the help of python code based automatation process?

I need to work with live layer effect (blur, outer glow, shadow) etc . I know how to use this with the help of QGIS symbol tool. But i need to integrate this in to my python automated map generation ...
1
vote
1answer
40 views

How to refresh MapCanvas while PyQGIS-script is running?

I try to write a PyQGIS script similar to this: Use of python console to prepare offline map from WMS (tile downloader). Basically there are two loops to pan the mapCanvas, refresh the mapCanvas and ...
2
votes
1answer
39 views

How can I add a second Toolbar Button and Dialog to a QGIS plugin built with Plugin Builder?

I want to create a toolbar with 2 buttons, each button opening a different form. The steps I followed are: Created a plugin using Plugin builder Created a toolbar with 2 buttons by doing the ...
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0answers
20 views

How to add fields to postgis layer loaded in qgis using python

I have loaded a layer from Postgis in qgis and I am adding the fields to the layer using the follo code snippet: canvas = qgis.utils.iface.mapCanvas() aLayer = canvas.currentLayer() field_name = ...
2
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1answer
32 views

QGIS Python variable not updating after new features are inserted

I have the following script that sets the a feature id automatically after a new feature is digitized. I added the function inside the project's Macro section inside openProject() function: The ...
3
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1answer
27 views

QGIS python getting number of new features to be stored in layers

I mean, how could I get the number of features that have been created in a given layer and that are pending to be saved in the layer when "Toggle editing" or "Saving layer edits"?
2
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1answer
25 views

QGIS Error while executing Python function in openProject() Macro: “QgsMapLayerRegistry is not defined”

I have the following script that sets the a feature id automatically after a new feature is digitized. I want the following function to be executed automatically when project is opened (and layers ...
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1answer
24 views

QgsMapCanvas object is not callable (Ubuntu with, Eclipse, Python & QGIS 2.0)

I'm basically borrowing the code for picking up a coordinate from a mouse click from this answer : How to programatically check for a mouse click in QGIS However in a stand alone application I do ...
3
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2answers
120 views

Removing layers with zero features from QGIS

I have more than 100 layers loaded in map canvas. Some layers don't have any feature. I would like to delete all layer with zero feature count. Is it possible to get a script which can delete all ...
2
votes
1answer
27 views

Problem using processing.runandload(…)

I'm writing a QGIS plugin using PyQGIS and I have a weird problem. When executing following line of code: processing.runandload("qgis:createpointsalonglines", r"Clipped", 1, 1, 0, r"memory:nodes") ...
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1answer
36 views

How is it possible to programmatically export current view as georeferenced image with QGis?

I found the this to export the current view as image. The following code works and was accepted as answer. c = iface.activeComposers()[0].composition() image = c.printPageAsRaster(0) ...
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0answers
19 views

How to rollback the committed changes in the Vector Layer in qgis

I selected few features in the vector layer and updated the field. But I want to rollback the changes committed to the vector layer. How can I do that in QGIS? I have used used the following coed: ...
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0answers
32 views

Is it possible to create an .ui file from .py file? [closed]

By applying the following pyuic4 -o filename.py filename.ui from an *.ui file I take the corresponding *.py file. Is there a way to do the oposite?
3
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0answers
54 views

How to integrate python-docx with QGIS

I have installed the newest QGIS and downloaded python-docx from this link python-docx . I haven't installed separately a different version of python. Is it possible to integrate this package of ...
3
votes
1answer
24 views

Add Values to New Column in Attributes Table using Python Console in QGIS

I've added a new column to my table called "STRNAME" using: path = "/Users/shapefiles/roads/" metro_roads = QgsMapLayerRegistry.instance().mapLayersByName('Metro_roads')[0] ...
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0answers
26 views

How to automatically run some scripts for QGIS python console by defining the python macros checkbox

I'm working with QGIS 2.8 in windows 10. I've defined the python macros checkbox to QGIS start and simultaneously run a script that has the same path from my "QGIS.qgs" file. In the Project>Project ...
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0answers
29 views

Setting icon for the submenu items in QGIS

I had added a new menu item as well as submenu item using the below code. I had succeeded in setting icon for all the submenus(HeatMapAnalysis,Buffer and Intersect.) But i cant able to set icon for ...
2
votes
1answer
60 views

“unexpected indent” in the script

I'm using a QGIS 2.8 in windows 10. I have 2 scripts that are working separately but when I write both in just one script, it doesn't work. The 1st script is to load one raster to QGIs with a defined ...
5
votes
1answer
67 views

Keep UI Settings for a QGIS plugin

I'm writing a plugin that interacts with external software (hydrological models). One of the dialogs has a lot of entries (parameters to pass to the hydrological software). Once the user has set up ...
3
votes
2answers
49 views

Distance Matrix of two datasets

I have two datasets of the same adresses, one geocoded with Google, the other with Nominatim. Now I want to compare address1 of dataset1 with address1 of dataset2, then address2 of dataset2 with ...
2
votes
1answer
25 views

Triggerring HeatMap Plugin using Python

I am trying to access heatmap plugin from Raster -> HeatMap -> HeatMap using PyQGIS.If my custom button is clicked, the heatmap plugin dialog box should opens.I know the heatmap is a c++ plugin.Is it ...
3
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1answer
75 views

Script that runs automatically from the QGIS Python Console when QGIS starts, using schedule tasks on Windows 10

I'm working with QGIS 2.8 and windows 10. Is it possible that after open QGIS using the schedule tasks from windows 10, I could open the python console and run a script within QGIS programmatically. ...
4
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0answers
27 views

Using QgsNewVectorLayerDialog

I am using QgsNewVectorLayerDialog for taking user input for creating a new shape file. When the user clicks OK i am reading the inputs selected by the user using the following code. dlg = ...
3
votes
3answers
53 views

How to add all “.dat” files (raster) into QGIS, in a defined directory and defined legend (style), using python code

I'm using a QGIS 2.8.3 in Windows 10. I've added just one raster ("dat" file) to the QGIS, with a defined legend, using the following code. If I wanted to add all the "dat" files into a directory how ...
2
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2answers
64 views

Customising QGIS Map Composer?

I am using QGIS for map making , I am adding multiple vector and raster layers and then finally for map making I am moving to the map composer. When I am exporting the map from Map composer , I want ...
5
votes
1answer
51 views

How can I print the text of help(some_method_class) in my QGIS plugin?

I'm developing a QGIS plugin to search classes and classes methods of QGIS. The dir equivalent option it was answered in: How can I access to elements in dir(some_class) of PyQGIS without a ...
4
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2answers
70 views

How to populate QTableWidget via plugin?

I am attempting to populate a QTableWidget by adding rows, this is done by the user clicking on the add button: I have the following code to try and insert rows but nothing is happening: def ...
2
votes
1answer
28 views

Create a layer in PyQgis with the same CRS as another

I want to create a layer which use the same CRS as another layer I already have in the project. The idea is to avoid the CRS dialog. I tried the things in this link: How to define layer's CRS and ...
3
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0answers
21 views

loop distance point pyQgis

I have a .shp of lines where I'm able to calculate the sum of segments length but i'm trying to put a point at a given distance in meters. The probleme is it put me a point at every segments.. If i ...
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0answers
23 views

Layer style is not rendered properly using PyQGIS

I'm trying to render a layer with the given .qml style into .png image using a standalone PyQGIS application. The issue is that not all the layers of the symbology are rendered, e.g. a polygon with ...
2
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1answer
30 views

How to connect QgsMapLayerComboBox to QgsDataDefinedButton

in Qt Designer there is the possibility to use directly QGIS custom widgets. In the UI I added a QgsMapLayerComboBox (to get the layers added in the legend) and a QgsDataDefinedButton. What I would ...
3
votes
1answer
37 views

Get QgsField alias in QGIS Python

In QGIS Python, how to get alias of field. In class QgsField, i can not find method to do this. lay = iface.activeLayer() provider = lay.dataProvider() fields = provider.getFields() for field in ...
4
votes
1answer
24 views

How can I optimize layer filtering using setSubsetString or QgsFeatureRequest().setFilterFids(my_indexes)

i'm developping a plugin (under QGis 2.8.1) for traffic assignment where I want to show the results of my simulation at each time step. Right now I'm using Time Manager plugin but it gets very slow ...
3
votes
1answer
42 views

Accessing Command line options passed to QGIS exe

I am using QGIS 2.8, I am passing the raster image along with the qgis-bin.exe from the command prompt. Is there a way to access the name of the raster being passed along the exe in my plugin?
1
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1answer
44 views

QGIS processing framework Python loading shapefile

I would like to write a Python script in the QGIS processing framework allowing the download of files from specific addresses. Instead of starting my script with: vectorLyr = vector I would like to ...
3
votes
0answers
53 views

Render Vector & Save as Raster

I am working with ENC files from noaa, specifically S57 format or ".000" to be as specific as possible. I am trying to render a layer or even the entire thing in a window but have had no luck. ...
2
votes
1answer
49 views

How do I use geometry object in processing.runalg()

I am trying to clip a polygon (large road network) with every row in another polygon (district polygon) using PYQGIS. layer_adm_level = QgsVectorLayer(base_path + adm_level + ...
4
votes
1answer
80 views

How to write Python code with QList class

I need to write an interpolation script for QGIS. I want use TINInterpolation method from Interpolation plugin. I found class in API documentation but I don't know how to write QList object with ...
0
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0answers
31 views

PyQGIS + Django Web Server — Not Working the Second Time Code Is Run

We are trying to create a standalone application on our local Django web server that uses PyQGIS to generate a series of maps based on a user's input. The user enters parameters on a web form and and ...
2
votes
0answers
22 views

PyQGIS: intersection of one node layer with two polygon layers

I´m new with the use of PyQGIS and I´m working in a problem applied to a water supply systems modelling, where I need to distribute the water demand in about 5000 nodes (network junctions). I´m ...
3
votes
1answer
29 views

How to keep live update coming from a WMS

I'm using a WMS that contain weather radars that is update every 10 min. I would like to know how to keep the map updating every 10min. I tried: from PyQt4.QtCore import * timer = QTimer() ...
2
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0answers
32 views

How do I change the pixel values of raster data from QGIS python plugin

I have been trying my hand at a QGIS plugin. The plug in reads raster layer data into an array, pipes the data to a C++ program, does processing over there, and pipes my results back. After a couple ...
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0answers
36 views

How to incorporate QGIS custom widgets into plugin? [duplicate]

Developing a plugin with Qt Designer for QGIS 2.14.1-Essen on Windows 7 and having trouble inserting the QgsCollapsibleGroupBox widget. I receive the following error: ImportError: No module named ...
2
votes
2answers
43 views

QGIS Segmentation fault when manipulating QgsGeometry

So I am running QGIS 2.8.1 on Ubuntu 14.04. This following problem is happening in my script, but also occurs directly in the QGIS python console: lay = iface.activeLayer() lay.featureCount() 1L ...
8
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1answer
168 views

Setting a default value in a QGIS field

I would like to add in a layer's field a default value. I mean, every time a new feature is created, that field would be automatically filled with the default value. In my case the default value ...
4
votes
1answer
58 views

Errror using the Simplipy QGIS plugin: 'QgsRasterLayer' object has no attribute 'selectedFeatureCount'

I am adding a raster in QGIS 2.14.1 and get this new error: AttributeError: 'QgsRasterLayer' object has no attribute 'selectedFeatureCount' I am not programming, just using a QGIS menu. I am using ...
1
vote
1answer
35 views

refresh programmatically created composer

I am trying to create a composer using pyqgis. Everything works as expected. The only difference compared to the manual creation of a composer is, that I am not able to update the layers (by pressing ...
3
votes
0answers
36 views

The features don't appear at the first time in my exported PDF

my problem consists of exporting to PDF format. The first time I run my code (Text Editor of QGIS) the PDF only has the legend. But the second time, it has the features. Changing the line of ...
4
votes
1answer
91 views

Bold and Italic layer labels with Python in QGIS

I'm trying to apply some labeling properties to a layer using Python. Everything went fine, except the way I tried to apply the Bold and Italic settings. Here is a part of the code: ...