Tagged Questions
0
votes
0answers
17 views
QGis non blocking notifications with pyqgis [duplicate]
I'm searching for the way to use the new QGis non blocking notification system with the QGis python wrapper. I found informations on this fonctionnality but nothing on how to use this especially with ...
1
vote
0answers
17 views
How to align QProgressBar label in QGIS messagebar? [migrated]
Unable to align the QProgressbar label in Qgis Messagebar. see the image below
While progressbar is updating,the label is vanished. so i tried the alignment for progressbar as shown below but its ...
0
votes
1answer
43 views
How to set Marker Line symbol for QgsVectorLayer by using Python?
QgsVectorLayer Right click->Properties->Style->Single symbol->click on simple line in tree node ->symbol layer type -> Marker line
Kindly help me to set marker line symbol programmatically by using ...
0
votes
2answers
67 views
How to make line with arrow head in QgsVectorLayer using python?
I need to draw line with arrow head or after drawn the line i need to make it as arrow head line by using python. or can we set any arrow head symbol for line features by using python?
Kindly help me ...
0
votes
0answers
53 views
How to use more than one QT form in Qgis Python? [closed]
I need a help to use multiple qt forms in PyQgis. For example, i need to open one qt form after the login form.
I tried like this:
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from qgis.core ...
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 ...
1
vote
1answer
62 views
How to “Merge Selected Features” with python?
I have been looking for the answer to this question for some time now, but can't seem to find it! My problem is straight forward:
I have one layer
It contains lots of features (only polygons), say ...
3
votes
2answers
191 views
How to automatically reloaded raster layer if source is changed in QGIS?
How to automatically reloaded raster layer if source is changed? (The path is the same but inside source file are changes)
I use:
qgis.utils.iface.mapCanvas().refresh()
but layer not refresh.
#
...
1
vote
1answer
45 views
How to get a message when the map is moved in QGIS?
I want to get a message when every time I move the map.
I had:
def info(self):
QMessageBox.information( self, self.tr( "Info" ), self.tr("info") )
I suppose that used to be something like ...
1
vote
1answer
51 views
Joining table to shapefile with pyQGIS
Joining shapefiles is a relatively straightforward proess in QGIS using 'add vector join' in the layer properties menu. I can add a csv file as a vector layer, as well as a shapefile, and join the two ...
2
votes
1answer
52 views
How to see print commands through Python Script while programming plugin for QGIS?
This might sound like a silly question.
Is there a way that from running a custom plugin made for QGIS that a Python Shell can appear along when the plugin is run, like a debug screen. I'm asking ...
4
votes
1answer
91 views
Speed of editing attributes in QGIS from a Python plugin
I'm trying to edit the value of an attribute for each feature in a layer using a QGIS Python plugin. I've found that doing this outside of editing mode is much slower than while editing (even ...
2
votes
2answers
69 views
How to determine the coordinates of the corners of the raster layer
How can we determine the coordinates of the corners of the raster layer? The image opens function QgsRasterLayer.
6
votes
1answer
96 views
How to save python session in QGIS?
After running a lot of scripts in QGIS' python console, I have more than 10 dictionaries and lists, and I need these for further analysis. Is there a way to save python session, with all these ...
1
vote
1answer
55 views
How to add MS SQL table using python console?
I have MS SQL Server 2008 R2 database. How to add MS SQL Table using python console in QGIS?
0
votes
1answer
54 views
How to handle adding a PostGIS layer in pyQgis without saving password?
I'm writing python plugin and trying to find the right way to add PostGIS layer on the map without storing user password.
After adding layer on the map, I strip out the password from uri like this:
...
6
votes
1answer
116 views
How to address the new “Task-Completed” QgsMessageBar in Python?
I am really amazed what huge steps the QGIS development has taken in the last months. The new iconset, the improved Print composer and many more changes to be seen in QGIS 2.0 are really awesome!
...
2
votes
1answer
74 views
How to add one or more points to an existing polyline or polygon?
Using the following code, I make a polyline with two points.
vl = QgsVectorLayer("LineString", layerName, "memory")
pr = vl.dataProvider()
vl.startEditing()
fet = QgsFeature()
...
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
2answers
90 views
How to write an equivalent to MapBasic's CreateLine in pyQGIS?
I know this kind of question has been asked, in part, before - specifically: Seeing QGIS Python Commands and: How is object created as line using createline stored in .tab file?
but this is a specific ...
1
vote
1answer
73 views
How to store selected attributes of vector layer using PyQGIS
I'm following this PyQgis workshop:
http://www.qgisworkshop.org/html/workshop/python_in_qgis_tutorial2.html#accessing-data-attributes
I have a point layer shapefile. I want to be able to retrieve and ...
1
vote
2answers
80 views
How to change vector attributes values?
I want to change vector attributes values.
i could not get the command fet.setAttribute
indeed, it is mentionned in http://hub.qgis.org/issues/7223 that:
"The QgsFeature instance now must be ...
1
vote
2answers
142 views
PyQgis overwrite shape file and adding layer to Qgis
I am creating a shapefile in python by:
driver = ogr.GetDriverByName('ESRI Shapefile')
datasource = driver.CreateDataSource('c:/temp/toke2.shp')
layer = ...
1
vote
1answer
102 views
How to write a CSV from Python console in QGIS?
I am trying to write out a CSV file from a vector layer made up of points using the python console in QGIS. I've tried the following command:
QgsVectorFileWriter.writeAsVectorFormat(layer_Map, Folder ...
0
votes
1answer
71 views
Split Map using Python in Qgis
I have a map, in which each region is defined as an attribute of the map (I can select each region from the attribute table). I am trying to create new layers each one containing only 1 region using ...
1
vote
1answer
85 views
How to evaluate raster calculator expressions from the console?
How can I execute from the console an expression that should be used with the raster calculator?
I'm searching for something like this:
qgis.someRasterCalcClass.evaluate("boh@1 + boh@2", ...
1
vote
1answer
50 views
How to use QgsOverlayAnalyzer class in pyQGIS?
I am very new to Python scripting in quantum gis, so bear with me please.
I am trying to use the QgsOverlayAnalyzer class in quantum gis (http://www.qgis.org/api/classQgsOverlayAnalyzer.html#details) ...
4
votes
4answers
110 views
How to display a “Save As” dialog for raster files?
I'm writing a QGIS plugin in python. I need to show a "Save as" dialog window in order to allow the user to select the path of the output raster file. Do I need to create a QFileDialog and manually ...
3
votes
1answer
164 views
How to deploy a QGIS Python Standalone Application with minimum installation size?
I am trying to create a Standalone QGis Application using python. I was able to create the nice looking shapeviewer application by following the steps here.
Now I would like to deploy this in ...
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 ...
1
vote
2answers
87 views
Where exactly are qgis.gui and qgis.core located?
I'm trying to create a standalone qgis app using pyqgis, i'll be deploying it by copying the install folder of qgis and source folder of my app, and so for the testing purposes i copied qgis install ...
2
votes
2answers
155 views
Extract coordinates from vector layer in PyQgis
In Qgis, I have made a polygon, and from that polygon I have made a vector grid via research tools-> vector grid. The grid covers the entire polygon.
Now I want to extract these grid points in the ...
4
votes
1answer
79 views
How change border line to no pen with python console?
From Python console I load a shapefile with qgis.utils.iface.addVectorLayer. How I can remove border lines (change to no pen) in the active layer?
0
votes
0answers
99 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 ...
2
votes
1answer
50 views
How to get a list of all projections that are currently available in QGIS via the PyQGIS-API
i'm building a QGIS-Plugin and i want the user to choose a CRS out of a combobox in which the coordinates he would enter into some textfields are represented, so these can be converted into another ...
5
votes
2answers
294 views
How do I use QGIS python console to iterate through simple layer queries and png outputs?
I'm really new to QGIS coding and I'm having a hard time finding (especially) the api classes/functions to carry out actions of the Query Builder window.
I'm basically trying to do this:
Iterate ...
1
vote
1answer
114 views
How do I copy all feature attributes to a feature in a new layer?
I'm trying to create a new layer in QGIS based on an existing layer. The new features should have all the attributes of the corresponding features in the original layer. I've been trying to use ...
4
votes
1answer
247 views
How do I maintain a resposive GUI using QThread with PyQGIS
I have been developing some batch processing tools as python plugins for QGIS 1.8.
I have found that while my tools are running the GUI becomes non-responsive.
The general wisdom is that the work ...
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 ...
3
votes
1answer
93 views
Join GPS points obtained from .GPX file in Python Console
Having loaded the .gpx file into a new layer from python console, I'm unable to access the gps points in the attributes table. Essentially, i'm unable to join these points to form a polygon ...
7
votes
1answer
101 views
Unable to load .gpx file from Python Console
I'm trying to create a plugin which will extract the gpx files and load them onto the active layer window in QGIS. While I'm able to load it using the QGIS GUI from Layer>New Vector Layer, I'm not ...
5
votes
1answer
145 views
How to transform a selected multipart feature into singlepart features while editing in QGIS?
There are several questions and respective answers for how to make a multipart features Layer into a singlepart features one using QGIS:
How to break a single polygon into multiple polys?
How to ...
1
vote
1answer
117 views
How to change cursor shape in pyQGIS?
I noticed that PyQGis has QgsMapToolPan() and QgsMapToolZoom() functions, and the cursor shape on the canvas will change to a hand (for pan), magnifying-glass(+/-) (for zoomIn / zoomOut).
I have a ...
2
votes
1answer
124 views
Why shapefile loaded in canvas always appear in random color?
I created the simple frame .UI file, compiled with pyuic4, and tried the ShapeViewer.py to load the shapefile "world_borders.shp". However, the map is always loaded in different random colors every ...
1
vote
0answers
155 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 ...
9
votes
4answers
463 views
How to buffer in pyQGIS?
I'm looking for some examples to do simple python scripts in QGIS. How would I do a buffer analysis on a dataset?
I can't seem to find much in the manual and QGIS python that quite matches the Esri ...
5
votes
1answer
157 views
How to call GRASS modules in pyQGIS?
I wish to use a Grass module (v.to.db) in QGis, without the grass toolbox.
I tried with the Python console, but to no avail :
Using Sextante plugin but obviously it didn't know all the grass ...
1
vote
1answer
860 views
How can I fix “ImportError: No module named qgis.core”?
First of all, I'm using Python 2.7.3, QGIS 1.8 (Lisboa) on Windows 7 pro 64 bits. Now let's go to the actual question:
I have written some code (Python) that works well within the QGIS built in ...
2
votes
0answers
26 views
How can I set python path and version for QGIS? [duplicate]
Possible Duplicate:
Couldn’t load SIP Module
When I'm starting QGIS I'm getting the problem:
"Couldn't load SIP module. Python support will be disabled."
And there is also:
Python version: ...
2
votes
2answers
201 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?
