Python bindings for QGIS.

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49 views

Getting values from Qt widgets and using them for a buffer

I am writing a simple plugin that finds buffer. My gui has 2 combo box and 1 Line edit. The first combo box will have a drop down of values from column 'States' and 2nd combo will have a drop down of ...
2
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1answer
77 views

How to move layers in the QGIS Table of Contents via PyQGIS?

I have loaded two layers in canvas and would like to move the layers using the following code in TOC, but it is not moving the layers to the position based on the index given. from PyQt4.QtCore ...
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52 views

How do I install a external package in QGIS?

Is it possible to install an external package in QGIS? For example: Can I install ReportLab in order to create a plugin to make pdf reports? Or Pandas. How can I install Pandas in QGIS Python ...
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1answer
35 views

How to apply a filter to multiple vector layers in QGIS?

I am trying to apply an attribute filter to multiple layers in QGIS at once. The filter is to be applied to .osm data brought in through PostGIS to QGIS. I have tried selecting multiple layers -> ...
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1answer
95 views

Adding field values to a QComboBox in PyQGIS

I have a layer say 'Cities'. There is a column called 'NAME_1' in the layer. My GUI has a QComboBox in which i want the values of column 'NAME_1' alone to be displayed in the drop down of the combo ...
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1answer
29 views

Show “Raise Notice” and “Raise Warning” in QGIS

Is there a way to catch "Raise Warning" and "Raise Notice" (while editing PostGIS-Layers) from a PostgreSQL/PostGIS-Trigger-Function within QGIS? One example: I have a trigger that reacts to insert or ...
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2answers
66 views

How do you change the scale bar units to feet?

I'm trying to change the default QGIS scale bar from meters to feet. From the API documentation it looks like I should be able to use the QgsComposerScaleBar.applyDefaultSize() function. I thought ...
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1answer
95 views

How to enable the snapping options for vector layer using the python programming?

I want to enable the snapping options for the the existing layers using python programming. How can I do this?
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50 views

How to position the Qwidget form/QDialogBox in the left corner using python programming

1) I am creating a Qwidget Form or QDialogBox using QT Designer. I am using the following code to move the form: sDialog.move(50,450) But i want to fit the dialogBox to fit in the left corner.How ...
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2answers
108 views

Adding a vector layer at QGIS start

I have added a shape file in QGIS using Python plugin. I want to add this shape file when QGIS is loading so i have to add code in the initgui() method. I have used following code in the initgui() ...
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1answer
85 views

How can I iterate over several layers and run a process using PyQGIS?

I am trying to find road intersections within each of my memory Polyline layers (which are named road_layer_i for i in (0-99)) so this is what I tried: import processing self=qgis.utils layers = ...
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2answers
106 views

Join table field with shapefile programatically (via PyQgis)?

The following is currently unsuccessful at fulfilling a table field join to a point shapefile in Qgis. All instances of the join object will print the proper values, and no error is flagged when ...
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2answers
121 views

How to load a data table as a 'vector layer' using PyQGIS?

This might be a simple problem, but how does one load a simple two column CSV with no associated geometric data? I have given a couple go's via QgsVectorlayer[delimited text, spatialite] types - but ...
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0answers
67 views

How to change the group icon in legend via Python in QGIS 2.6?

How to change the group icon in legend via Python in QGIS 2.6? At version 1.x I did it this way: self.legendTree = self.iface.mainWindow().findChild(QDockWidget,"Legend").findChild(QTreeWidget) ...
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47 views

How to best get Qt Designer for QGIS plugin development on Mac?

I'm using QGIS 2.6.1 on Mac OSX 10.9.4, trying to create a plugin as described in the PyQGIS Programmer's Guide. I have the plugin 'skeleton' (main widget with header and ok/cancel buttons) running in ...
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1answer
66 views

Layer properties dialog in my QGIS plugin

I am developing a plugin which should display some information like geometry of the layer, feature count etc. Now those are currently displayed in QMessageBox.information. I want it to be displayed ...
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47 views

How to resolve warning messages from standalone script?

The standalone script, loaded from OSGeo4W Shell and copied below, follows a set of steps: Create grid with cells length/width at 200m Clip a polygon layer onto the grid Use Distance to nearest hub ...
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2answers
73 views

QGIS (2.4) keeps caching old Python code

I'm fiddling around with a piece of python code to use with form validation. It works fine, but the real problem is that QGIS refuses to acknowledge the changes I make in the script. Here's what I ...
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1answer
78 views

How to deactivate my custom tool by pressing the Escape key using PyQGIS?

I'm developing a QGIS plugin and I have created a custom tool. Once the process is over, if the user presses the ESCAPE key, I want my custom tool not to trigger mouse events on the map anymore. How ...
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1answer
79 views

How to iterate over features and abort iteration with keypress in PyQGIS?

I would like to run a loop with PyQGIS, it should wait for the user to press a key either SpaceBar or Escape to continue. canvas = qgis.utils.iface.mapCanvas() aLayer = canvas.currentLayer() feat = ...
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44 views

Loading all the vector layers in plugin

I have a list of vector layers loaded in the canvas of qgis. `layers = self.iface.mapCanvas().layers() for layer in layers: if layer.type() == QgsMapLayer.VectorLayer: ...
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1answer
86 views

How to link my QGIS plugin main class to mouse events from a custom Tool?

I Have two files one is mouseevent.py and the other one main.py. class MouseClick(QgsMapTool): canvasDoubleClicked = QtCore.pyqtSignal(object, object) def __init__(self, ...
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40 views

The result is not displayed after OK is pressed in my plugin

I am developing a plugin that checks for multipart geometry in a layer in qgis 2.6. After ok is pressed, nothing is displayed. My code snippet is attached. def run(self): """Run method that performs ...
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1answer
70 views

Attribute Error: “List” object has no attribute getFeatures

I am developing a plugin that checks for multipart geometry in a layer in qgis 2.6. I am geeting an error list object has no attribute getFeatures. My code snippet is attached below. def run(self): ...
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87 views

MultiLine field-name label referencing

A labeling routing (which is updated often) is being implemented via pyqgis and a QComboBox. The attached code below worked great, that is until needs for narrowed column headers spawned the use of ...
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1answer
37 views

Load Oracle Spatial Raster using PyQGIS

Able to connect to Oracle Spatial 11g and print tables with SDO_GEORASTER attribute both in QGIS python console and standalone application.I get below error when loading rasters from oracle Table. ...
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1answer
62 views

Load PostGIS or Oracle Spatial Raster Layer using PyQGIS

How do we load Rasters stored in PostgreSQL-PostGIS or Oracle Spatial 11g into QGIS using PyQGIS? I am able to load vector layers from Oracle 11g with below code. What changes are necessary to add ...
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1answer
105 views

How to show Python console at QGIS program start

I wonder if there is a way to open the Python console of QGIS 2.6 directly at program launch. There is a possibility to set a shortcut for the Python console, but I can't find such an option for the ...
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3answers
186 views

Why script works on my computer but not on another?

The script below works perfectly fine in my computer. But when running the script on another computer, I receive an error: Error: Algorithm not found The computer has similar specifications to ...
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55 views

Using processing using other output (result from another algorithm) as input

I have a problem. I am developing a standalone app in python and I need to use processing algorithms. I was able to use one algorithm without erros but I need to run other processing algorithm which ...
2
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1answer
52 views

QGIS toolbars source code

I can see the source code of the core QGIS plugins from the repository in github. But is there any repository of source codes for QGIS toolbars also?
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80 views

Custom QGIS 2.6 map tool - mouse click and release issue

I have create a custom map tool for QGIS 2.6, implementing a canvasReleaseEvent and canvasPressEvent. I can't though get the signals to work on one single mouseclick (I have to click twice). My map ...
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2answers
51 views

Send signal when attributes modified - QGIS 2.6

For a QGIS 2.6 python plugin, I am trying to send a signal when an attribute value is changed (values for an existing feature are updated or added and the attribute form dialog is accepted). This ...
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1answer
49 views

Why use QgsFeatureRequest() when iterating?

I am unclear on why one should use QgsFeatureRequest() when iterating over a file’s features. Let’s say I would like to print out all IDs in my currently active dataset. Now, most examples will ...
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2answers
61 views

Start QGIS with virtualenv Python

is there any means of telling QGIS to use a different Python installation than the default, system-wide one? E.g. use some virtualenv Python /myvirtualenv/bin/python instead of /usr/bin/python? ...
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0answers
56 views

Efficiently generate Voronoi layers in qgis via Python

The following python commands both appear to function when called in qgis 2.6 to generate Voronoi diagrams: processing.runalg("qgis:voronoipolygons", pointLayer, 1, None) ...
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1answer
130 views

Run processing toolbox outside QGIS in standalone app

I am developing a standalone app in Python, using QGIS libraries including processing algorithms. I am developing in Linux environment and I put the libraries in a folder. Also I put the processing ...
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1answer
47 views

How to create a text file containing layer names in QGIS?

My QGIS ToC contains layer groups and some layers that do not belong to any group. I would like to create a text file containing the name of those layers that do not belong to any group. Is there an ...
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1answer
139 views

What is the purpose of some functions and files in QGIS Python plugins?

I'm just trying to understand the architecture of a QGIS Plugin created with the QGIS Plugin Builder, as well as the workflow and the linkage among generated files. If possible, I'd prefer a diagram. ...
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1answer
31 views

If statement using QgsRasterCalculator

So in the sequence of my previous question (Can't use Raster Calculator with two different rasters), I am stuck again in my project. With my source rasters, I created 3 different outputs using ...
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39 views

QgsRubberBand with holes

I tried to create a QgsRubberBand object with holes, but failed: rb = QgsRubberBand(iface.mapCanvas(),True) geom = QgsGeometry.fromWkt("POLYGON((0 0,4 0,4 3,0 3,0 0),(1 1,3 1,3 2,1 2,1 1))") ...
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1answer
37 views

QGIS 2.6 : Programmatically setting key value pairs for ValueMap widget

Using QGIS 2.6 and Python 2.7 on Windows 7, I am trying to programmatically insert key value pairs into a ValueMap widget via a csv file. Issue is that some of the values are properly inserted and ...
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0answers
26 views

Error while creating QGIS plugin

I tried developing a python plugin in QGIS2.6 following the instructions in the link http://anitagraser.com/2014/04/26/getting-started-writing-qgis-2-x-plugins/.When I launch the plugin in QGIS after ...
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1answer
91 views

Load the raster image which is in TIF format using QGIS API

I am quite new inthe field of GIS. I am interested in is to load the raster image which is in TIF format using QGIS API I have followed the steps given the in the follwing link to load shape file ...
1
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1answer
43 views

How to select features using an expression with pyqgis?

How can I select features with pyqgis using an expression? I tried to use an QgsExpression but the select method doesn't take it: exp = QgsExpression("'ogc_fid' = 482") cLayer = ...
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1answer
52 views

How to zoom to selected feature with QGIS Python Console

I want to select a feature by ID and zoom to it. I tried the following but the canvas doesn't change. Any ideas? canvas = qgis.utils.iface.mapCanvas() cLayer = canvas.currentLayer() cLayer.select(51) ...
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158 views

Is there scripts of QGIS core plugins available anywhere?

Is there anywhere I can see the scripts of the Qgis core plugins.
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1answer
53 views

User Interface file compilation using OSGeo4W shell during qgis plugin creation

I am trying to build a plugin in Qgis2.6 using plugin builder. And as a part of the same, I tried compiling the .ui and .qrc file using OSGeo4W shell. It is showing an error during compilation in ...
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1answer
163 views

Why the order of imports matters in a standalone PyQGIS processing script?

I've come across a weird issue while running standalone PyQGIS processing scripts. The order of imports in the script affects its normal execution. You can reproduce the problem by opening a Python ...
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2answers
39 views

How can I disable logs being created in standalone python script?

When I run the following script in QGIS 2.6.1, it produces a folder called 'processing', which contains a log, in the directory it reads files from. And since the script reads files from several ...