Python bindings for QGIS.

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54 views

Plugin to run one function when run button is clicked

My plugin gui is attached below which has two functions one is selecting state, cities from the combo box and distance to be entered in the lineedit and the other is if we click a pushbutton it will ...
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1answer
81 views

Go through items in a composer legend (QGIS 2.6)

I'm trying to develop a plugin in QGIS 2.6, which opens a composer, add a map and a legend, and (among other things) adjusts the legend. Is there a way to go through items in a composer legend with ...
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2answers
63 views

How to get a layer that is not active with PyQGIS

I want to retrieve attributes of selected objects on a layer with PyQGIS. All example I see is for the active layer: vlayer=qgis.utils.iface.activeLayer() selected_bf = vlayer.selectedFeatures() ...
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1answer
56 views

How may I use Umlaute programmatically to show up correctly in PyQGIS messagebar?

So far I couldn't figure out how to write something like u"Einstellungen aus ArcView übernehmen" to show up correctly as the titel of my messagebar. At least I can save my source (although this seems ...
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0answers
21 views

Refreshing QGIS view [duplicate]

I've written a short python script for use in QGIS (currently using 2.8.1) to set the CRS for all loaded layers to OSGB 1936 / BNG. The script correctly sets the CRS but I have to manually scroll ...
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1answer
56 views

Trouble buffering a vector layer in QGIS with PyQGIS

I am working on a script that imports a .csv layer that has lat long coordinates, which I then want to buffer in feet. I've created a vector layer from the .csv file and tried to set the coordinate ...
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27 views

How to activate the cursor once we deactivated by activating panning tool

We have activated pan tool on canvas using the following command: canvasPressEvent(self,event): if event.button == 1: qgis.utils.iface.actionPan().trigger() canvasReleaseEvent(self,event): ...
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1answer
32 views

List printing same values as a buffer output instead printing unique values

I have a list of features selected in the mapcanvas and for that selected features i am doing buffer and printing the feature names that are inside the buffer. While printing,all values in the list ...
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1answer
48 views

How to add point features with coords taken from a .txt and show them on the map canvas?

Ok, so i am on Windows 7 and using QGIS 2.6 and i have a .txt file with some simple coords. I have extracted the coords to a list, no prob with that. But i looked at the PyQGIS cookbook on how to add ...
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2answers
86 views

How to access checked layers in PyQGIS?

qgis.utils.iface.activeLayer() accesses the current active layer, but I would like to get all checked layers in the QGIS ToC. How can I do it?
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1answer
75 views

Convexhull for selected features and performing buffer for the resultant convexhull using python

I have features selected on the mapcanvas. I want to perform convex hull for those selected features and save those in a memory or store it in a variable preferably and then want to do buffer for the ...
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82 views

How to install pygame or Tkinter for QGIS Python?

So i have downloaded pygame and installed it. Now i want to write scripts and run them through the QGIS console that implement methods of pygame but when the console reads "import pygame" i get a ...
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1answer
84 views

Save Vector layer and update .qgs project file (pyQGIS)

need help to solve the following use case: QGIS started with new project (no layers) New layer is created programmaticaly and data is populated: vl = QgsVectorLayer("Point", "temporary_points", ...
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0answers
25 views

Labels not displaying when rendering to image with pyQGIS

I'm using the simple example in the pyQGIS cookbook http://docs.qgis.org/testing/en/docs/pyqgis_developer_cookbook/composer.html I'm able to manipulate the features in my layer using Python, but the ...
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2answers
94 views

How to programmatically close a QMessagebox without clicking ok or X? [closed]

So part of my script in PyQGIS is this: QMessageBox.warning(None,"Warning","bla bla bla") The box apperas just fine but i want it to close after a few seconds so i am looking for something like ...
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1answer
34 views

How to apply Zoom Extent from several QgsVector layers with Labels in PyQGIS?

I have the following case: Project constists of three layers: Open Layers plugin with Google streets QGSVector layer with Point features and Label enabled QGSVector layer with Polyline features and ...
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92 views

How to stop a PyQGIS script that has an infinite loop, using the keyboard?

So i wrote a script that does what i want over and over again using a "while True:" in a certain time interval (every 5 seconds using time.sleep(5)). So far so good BUT when i want to stop it i just ...
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44 views

How to reload a raster file from the python shell

I do this in the QGIS python shell: # get the raster file (and data) of the active layer canvas = qgis.utils.iface.mapCanvas() rLayer = canvas.currentLayer() rLayerPath = ...
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1answer
92 views

How to change the edit widget for fields in a layer with PyQGIS?

Is possible change the edit widget with PyQGIS? I have made an extension that loads a PostGIS layer and I want to edit the date fields with the date widget by default without any change in the ...
2
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1answer
66 views

Why does this Python script only work once on QGIS?

I have a Python script to change the color of some specific features (lines) using categories in a vector layer. When I import the script in the console, the first time through the console it works ...
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1answer
28 views

QGIS get the X and Y of a raster file by click

I have a raster file (Geotiff) and try to write a plugin that can change the value of one cell in a raster (== array cell). I know how to get a QGIS point but how can I get the array index from on ...
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1answer
43 views

How to change the color of a specific feature(s) with a PyQGIS script

First of all im a big noob so don't hate. So image that the lines that i have drawn is simple pipeline network, represented by some simple lines in a vector layer. Now the question is, how can i ...
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1answer
74 views

PyQGIS plugin debugging from Eclipse

having trouble with debuging QyPython plugins from Eclipse: - Win 7 x64 - QGIS 2.7 - Eclipse Luna with PyDev installed Tried to debug using Remote Debugger ...
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50 views

Creating Convex hull and finding buffer in QGIS

I have a layer and features are selected using Select Features by freehand tool and for that selected features, convex hull was done and for that convex hull i am trying to find buffer and write it in ...
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1answer
42 views

Buffer for features selected in the mapcanvas and writing to csv file

I have some features selected by using "Select Features by Freehand" tool in QGIS and try to find the buffer for those selected features alone and write the city and state names within in the buffer ...
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1answer
86 views

Use raster memory layer from QGIS processing result

I want to apply subsequent QGIS raster processing algorithms in a python script. I want to use memory layers for intermediate calculation results since I am only interested in the end result. As ...
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1answer
47 views

Odd behavior in a QGIS plugin: my function is triggered twice

I have a plugin with a function (triggered by a button) that selects a specific layer by name, then shows its attribute table. When I close the plugin and open it again, the attribute table pops up ...
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1answer
37 views

How to select from selection with PyQGIS?

The expression box has a handy "select from selection" button. Is there a way to emulate this with python? I have the basic expressions down, but can't find a way to do this.
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1answer
48 views

How to do a buffer operation for a polygon drawn by the user using python in QGIS

I have a polygon drawn on the map canvas.Say the polygon would be drawn by using "Measure Area" tool in qgis.Now, I want to do buffer for certain distance around that polygon.I can see the below ...
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1answer
29 views

Warning message needed when there is no specific layer instead of python error

In my plugin, when I click a button it will call the findTheCityNames function which is attached below and get features if there is a particular layer. What I want is if there is no specific layer in ...
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1answer
70 views

How to get a layer by name in PyQGIS?

I have a plugin which finds buffer for list of cities, provided the distance. The state and city names are taken from the attribute table and gets filtered accordingly. What I want is My plugin should ...
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1answer
70 views

Global name canvas is not defined

I am just trying to print the layer name using python in my QGIS plugin by following code. allLayers = canvas.layers() for i in allLayers: print i.name() It is saying an error: Global name canvas ...
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1answer
71 views

PyQGIS load dxf file as a vector layer

Can somebody help me with loading a dxf file as a vector layer with PyQGIS? Is QgsDataSourceURI an option? I've tried it with this code, but it didn't work. fitxer="/tmp/prova.dxf" uri = ...
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33 views

Vector Layer Symbology Export?

When programmatically creating / saving a QgsVectorLayer - implementation of the ExportSymbology functionality does not seem to exhibit the implied effects. Does such a command not indicate that the ...
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1answer
73 views

Cannot rename output file using standalone script for QGIS

I would like to rename all output files after my script has finished processing them by adding "(A)" after their file name (eg. Layer.shp -> Layer (A).shp). I received an answer from this post on the ...
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36 views

How to select the buffer region in map canvas in my plugin using python

I am developing a plugin which finds buffer by getting state name, city name and distance given by the user. The plugin works fine and writes the cities that matches the distance in a CSV file. What i ...
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1answer
106 views

How to add label to QgsVectorLayer by Python

my goal is to define label programmaticly for the case similar for the figure below: But didn't find any guidance how to do so using Python. I have a feeling it could be done using QgsLabel but ...
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1answer
27 views

Error while trying to replace a opened csv file with the newone in my plugin

My plugin does some basic geoprocessing functionalities and write the output as csv file. What i want is when i open some already writed output csv file in a writable mode and try to replace the same ...
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1answer
73 views

How to add multiple attributes to a newly created feature with PyQGIS

I am creating a form for updating the attribute values of the newly created feature. But when i am updating the values only one attribute field is getting updated. So if i want to update the multiple ...
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1answer
181 views

Does mapCanvas().refresh() not work in QGIS 2.6?

Before I used the function qgis.utils.iface.mapCanvas().refresh() to reload the map canvas after for example a layer color was changed from a plugin. But this is not working with QGIS 2.6 for me. ...
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1answer
97 views

How to export only certain column from selected feature to csv file in QGIS using python code

I have selected features in QGIS, I want to export only two columns from the selected features to a csv file automatically using python code. I have tried the following code: layer = ...
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2answers
89 views

How to define layer's CRS and avoid the CRS dialog in PyQGIS?

There is an existing Shapefile, which I want to add. At the moment my code looks like: self.iface.addVectorLayer(self.shpFilePath, "Track", "ogr") It works fine, but i want to define the crs ...
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1answer
79 views

Download file from network using PyQGIS 2.x

I have a python plugin targeting QGIS 1.8 that uses QgsNetworkAccessManager and QNetworkRequest to issue a GetCapabilities request to WMS servers. With 1.8 everything was working fine. Now we are ...
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26 views

Error in finding buffer

I am trying to find a buffer for city provided a state, distance and filepath to write as csv. What i am facing is that the name which i selected in the city combo box alone gets writed in the csv ...
2
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1answer
110 views

Adding new menu item to QGIS Desktop app

I need to add new menu item to the top level menu of QGIS Desktop (2.7.0); I.e. it shall be on same level as "Project", "Edit", "View", "Layer" etc. As far as I know there is pretty nice way how hide ...
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1answer
37 views

Removing the duplicate values in QCombo Box

In my plugin, there is a combo box which lists city names for a particular state. FOr example, if i chose a particular state and city will be some 20 names in the dropdown. But the first name alone ...
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1answer
61 views

Issues with PyQGIS while running a QgsZonalStatistics script

I have experienced a very bizarre issue with my PyQgis code. I simply want to load a raster and a vector layer to do zonal statistics, the first part works perfectly but for the zonal statistic I have ...
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36 views

How to change the attribute values of the feature using the custom feature form

When i am using the following command it opens the feature form with all the fields: qgis.utils.iface.openFeatureForm(qgis.utils.iface.activeLayer(), f) But i want to open a feature form with the ...
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1answer
42 views

How to compute buffers for certain features?

I used the following snippet of codes for finding buffer. def buffer(self): layer = self.iface.activeLayer() distance = float( self.dlg.DistancelineEdit.text() ) city = ...
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1answer
45 views

How to connect mouseclick to map canvas in QGIS?

How to connect mouse click to map canvas in QGIS using python script? I have two lines of code to connect mouse click to map canvas: button.clicked.connect(self.onClicked) ...