Tagged Questions

Is a cross-platform application framework that is widely used for developing application software with a graphical user interface (GUI) (in which cases Qt is classified as a widget toolkit), and also used for developing non-GUI programs such as command-line tools and consoles for servers.

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44 views

With QGIS, why use QT Designer tools for creating Slots/Signals/ etc, if plugin coding can do it alone

I am curious why there is facility within QT Designer to create signals and slots as, to my surprise, I did not need to do this. All of the necessary coding was accomplished completely within the ...
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0answers
19 views

How to find QGIS or QT or Python object definitions

I am attempting a simple plugin, on QGIS 2.6, using the available QT Designer installed I have successfully loaded a plugin, and can display a dialog box with widgets, within, and now attacking ...
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1answer
25 views

With QGIS Plugin Builder, receiving “ImportError: cannot import name”

While doing a first-time attempt to craft a simple plugin, I ran into the above error. I am using QGIS 2.6.0 for windows, the QT Designer that comes with that package, and the plugin builder plugin ...
2
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0answers
20 views

How to actually add the path to a file conatining a photo on a QT form using QGis/Postgis/Postgress

Simple newbie question as I have just designed my first QT form, after a frustrating afternoon search unsucessfully for the answer, help please. I have a spatial table in postgress, loaded into QGis, ...
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0answers
34 views

Syntax Error in qgsapplication file

I am trying to test an QGIS application code example. However, when I try to compile it, it is reporting errors in qgsapplication.h which is coming with the source code of QGIS. I am using QTCreator ...
3
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2answers
96 views

QGIS Installation on Windows

I'm newbie to QGIS and to this forum. I want to develop application using Qt on QGIS to real time updation/mapping of a symbol using GPS co-ordinates. Initially i have installed QGIS on Windows 32 ...
2
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1answer
45 views

QGIS Plugin development version compatibility

At this time latest QGIS version is 2.4 , QT Version is 5.3.1 and PyQT5.Are these version compatible with each other ? Once QGIS 2.4 is installed , how does one know which version of QT and PyQT(and ...
2
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1answer
75 views

Add band to GDAL VRT dataset and convert to TIFF

I'm trying to add a band to a TIFF dataset by converting it to a VRT format and using the AddBand() function, then convert it back to a TIFF to access the band and write the data. Here is an example ...
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2answers
66 views

GDAL Application crashes when loading GDAL drivers

I'm developing on QT an application that uses GDAL library (which I compiled using MinGW 4.8). When I use the application on my windows 8 laptop, it works fine, but when I tried using it on several ...
2
votes
1answer
101 views

How to add buttons to QT ui for qgis feature forms to loop through attributes?

I'm looking for a bit of guidance. I'm happy creating a standard feature form using QT designer (as excellently documented here) for QGIS but I was wondering how you add a forward and back button to ...
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0answers
28 views

Plugin Ui interation with user and Qgis

A downsized hydrogeology plugin ( GraphicGroundwater = GGW ), instilled the need of a reduced combination of Carson's 'fTools doVectorGrid' and Pryet's 'Qgridder' plugin(s). The GGW Ui is displayed ...
2
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1answer
70 views

Referencing Qt UIs external to plugin with python

I'm developing a plugin that sets up a working environment for a user: loading layers (from db), applying styles and several custom designed (Qt) UI files etc. Primary user interaction is in the ...
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1answer
165 views

How to use Threads in PyQgis, mainly to keep UI active?

I'm trying to develop a plugin, which does heavy computations and as a result, user interface becomes inactive. I know that I should use threads to keep the UI alive (specifically, I have a progress ...
1
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1answer
105 views

How to populate a combobox with layers in TOC?

I am developing a plugin, and I want user to select one of the loaded layers from a combobox. I've already coded this much: self.dlg.show() layerlist = [] self.dlg.ui.layerCombo.clear() # ...
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0answers
90 views

QGIS custom form and autocompleted data entering with “validation check”

In Qt-Designer I created a custom form where I can choose serveral species names in two different combo boxes. This combo boxes are linked via "value relation" to the accordant non spatial tables ...
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0answers
110 views

QGIS-QT designer. How to create a form that allows editing elements linked by one to many relationship

I know this question has been already asked on this forum, but I really have not found any answer, not here, not anywhere. My question is simple, I have a Spatialite DB having one spatial layer (Pole) ...
0
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1answer
77 views

Building with MinGW 4.8

I'm working on a project where we would like to add QGIS features to an existing Qt application. The Qt application has been built with Qt5.2.1 using MinGW 4.8 and thus I think I need to build QGIS ...
2
votes
1answer
47 views

In what ways has QGIS 2.x API changed making Plugin Builder Tutorial invalid?

I am working on the QGIS workshop Tutorial for QGIS Plugin Builder and notice that it is for QGIS 1.1. As this seems like a popular tutorial, in general, what are some areas of this tutorial that need ...
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1answer
204 views

QT Designer form - Combobox stores value but doesn't display it

I have a custom form created with QT Designer on which I have several comboboxes among other stuff. All the fields have the correct names corresponding to the database. One of these comboboxes has a ...
0
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1answer
79 views

Duplicate values in combobox in QT Designer form

I have a custom form created with QT Designer on which I have several comboboxes among other stuff. All the fields have the correct names corresponding to the database. But something weird and ...
0
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0answers
42 views

QGIS Widget for data entry. Many fields based off 1 combobox

I have used QGIS for a while now but have just started getting into creating widgets for data entry. I want to know if there is a way to create a widget that will auto populate 2 or 3 other columns ...
0
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0answers
32 views

What does it entail to move Qgis to Qt 5.0 [duplicate]

What does the work entail to move QGis to Qt 5.0? Is there a road map for this? Ok, I agree that the above question can be interpreted as a duplicate, see Can I use Qgis with Qt5 Some of the ...
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0answers
64 views

Problems with connecting QDateEdit and QTimeEdit widgets to corresponding Field in QGIS Layer (shp/spatialite)

Could anybody give me a hint how to connect the QDateEdit and the QTimeEdit widgets with a field in a QGIS layer (shp or spatialite). The fields in the QGIS layers are from datatype "date" ...
4
votes
2answers
323 views

Binding between QGIS custom form (Qt Designer) and date/time field in a SpatiaLite database table

For my attribute table I created a custom form in Qt Designer. The table has a date field and a time field. In Qt Designer there are widgets for entering date and time. But what data type is expected ...
0
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1answer
177 views

QGIS 2.0 Howto copy raster data from a QgsRasterDataProvider to an OpenCV matrix

I'm hacking the half day arround a problem and that I' thought it was simple one. I'm using C++ (QtCreator) QGIS 2.0 und openCV2 on an 64 bit Workstation runnig Debian Wheezy. The Application I try to ...
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0answers
137 views

How to create a spatial view when allowing multiple selection in qgis’s edit widget “value relation”?

I've a point layer in qgis and serveral non spatial tables in a spatialite database. In qgis the fields were filled using the edit widget "value relation" (multiple selection allowed for some fields). ...
0
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2answers
158 views

What kind of QT widget is the QGIS drawing area?

I mean when open QGIS , and add a vector layer or other type of data. The content will show on the "Drawing Area", i want to ask, the drwaing area is some type of widget or just in the QMainWindow? ...
0
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0answers
109 views

can't Find file chooser widget in QTdesigner for QGIS file name edit widget custom form

I designed a custom form (*.ui) for my shape file under QT Designer. I want the user to choose a file through a QGIS "file name" widget but I can't find the control in QT designer. Regards,
2
votes
1answer
839 views

Is it possible to query via bounding box in the Google Maps Static API?

We have a Qt program written in C++ to request wms tiles and display them. This works fine. Now we want to display imaginery from Google Maps and due to some restrictions in our program, we can't use ...
0
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0answers
89 views

Using GDAL to link to a TMS

I currently have a C++ application that will consume a WFS using gdal. It determines if the WFS layer is points or polygons then adds stores them in an appropriate object that is later used to ...
3
votes
1answer
74 views

How to create a printable data sheet when using edit widget “value realtion” in QGIS 2.0?

I created a spatiaLite Database with a point layer (every point is a tree). Additional I created several tables to fill the columns of the spatial layer with attributes using the editing widget “value ...
0
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0answers
525 views

Trying to make QT + QGIS working

I'm mostly a Java programmer, I worked on C++ many years ago, and knowing this my project manager has asked me to create a little app in Qt that can open a shape file, using QGIS. But I'm encountering ...
0
votes
1answer
168 views

Pull pixmap image source from ui edit text in QT

I'm putting together a custom form for QGIS identify using Qt Designer. One attribute has a file name to the accompanying photo of the feature. I'd like to have the photo label in the form grab the ...
1
vote
1answer
134 views

Buttons (Ok, Cancel) disappear in “Apri Modulo” from Attribute Table in QGIS 2.0.1

QGIS 2.0 has changed the visualisation of a form opened from the attribute table: instead of opening the form in a separate window, the form is opened in the same one. This is not a problem, but all ...
1
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1answer
153 views

How can I add a delete button to feature forms?

I have created some formulars in QTDesigner for capturing and manipulating data in QGIS. The data is stored in a postgis-database. It would be helpful to have a delete-button in this formulars to ...
1
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0answers
235 views

ArcGIS (ArcObjects) Windows 7 - 64 bit -support

I have been developing with ArcGIS Cross Platform C++ SDK (with Qt 4.8.2) on 32 bit Windows XP SP3 (development machine). I used to use MapTool Control within ArcObjects on the development machine. ...
2
votes
1answer
459 views

Using GDAL to connect to a WFS

I'm trying to connect to a wfs using GDAL, from reading some of the (fairly sparse) documentation on this i have found that this is possible if GDAL is compiled with the correct drivers (Curl, ...
1
vote
1answer
258 views

Connect not working for custom QGIS form

So I have a custom form for editting feature attributes. However, I can't seem to correctly disconnect and reconnect certain bindings. The init code is below and should work for any simple QT widget ...
0
votes
1answer
135 views

connect signal to function with arguments

Hello I have this function on python that take 2 arguments: def niveau(controName,idNiveau): ........ I want to connect it to this signal: ...
0
votes
1answer
177 views

QGIS plugin WORKS under Windows but NOT under Linux. How to get fîle path properly under Linux?

I am currently working on a QGIS plugin which depits node to node discreet flows. Let' say adaption of Tobler's Flow Mapper to QGIS. Plugin currently tested and working under Windows. But not under ...
1
vote
3answers
766 views

Can I use QGIS with Qt5?

I want to use QGIS with Qt 5.But i don't know the exact relationship between Qt and QGIS.Will there some problems if i use qgis with qt5 or it will not depand on it...
3
votes
2answers
746 views

circle detection on binary image

My image is gray scale image which i have converted to binary by smoothing and then edge detection method. Now i want to place the circle /ellipse on edge detected. I don't know how to proceed ...
5
votes
1answer
791 views

How to create a dropdown menu in QGIS Toolbar with Python

I Have a set of some QAction in my QGIS-Plugin and they are created and added to the toolbar like this icon = QIcon(":/action1.png") self.action1 = QAction(icon, u"Action 1", self.iface.mainWindow()) ...
4
votes
1answer
340 views

QGIS - Add a combobox to a toolbar

Is there a way to add a combobox to a toolbar for QGIS? So far I can only find examples that add buttons. I found this tutorial which seems to explain how to do this with general PyQT but haven't had ...
3
votes
1answer
331 views

Offline Map - QGraphicsGeo

I’ve realized a desktop application based on Qt Mobility for displaying maps and adds some landmarks in real-time (like QGeoMapObject). I've to see the track of some vehicles... I've used the code ...
2
votes
1answer
262 views

How to move the QGIS Layerpanel/Dockwidget programmatically

i'm working on a QGIS-plugin and want to move the default LayerPanel/Dockwidget to somewhere else programmatically. More specific: i want to move it into a tab of my tabwidget. Is this possible? How ...
6
votes
1answer
86 views

How to get info from selected object?

I am new to the Quantum Plugin development and wonder if there is more information about the following. I have added a shape file and am (off course) able to select a point from this shape file. In ...
0
votes
3answers
411 views

Run function if item in QComboBox is selected

I got another issue writing a plugin to convert three shape files into an .obs input file. I created a UI (Qt) with a QComboBox to select a layer (that works fine). As soon as one of the layers in the ...
1
vote
1answer
194 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 ...
2
votes
0answers
169 views

qgis and embedded ajax (bing map)

I need to load in a docked QWebView this html: < html > < body > < iframe width="100%" height="499" frameborder="0" scrolling="no" marginheight="0" marginwidth="0" ...