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What is QGIS Iface?
When QGIS is running, a variable called iface is set up to provide an object of the class QgisInterface to interact with the running QGIS environment. Python Console and Plugins can use iface to access various parts of the QGIS interface.
What is spatial index in Qgis?
Spatial indexes are methods to speed up queries of geometries. This includes speeding up the display of database layers in QGIS when you zoom in close (it has no effect on viewing entire layers). This recipe applies to SpatiaLite and PostGIS databases.
How to customize the QGIS interface in Python?
We will also explore GUI programming techniques for customizing the QGIS interface using Qt widgets. This course requires basic knowledge of Python. If you are not familiar with Python, it is strongly recommended you complete our Python Foundation for Spatial Analysis course. We will build upon the exercises covered in that course.
Where do I find the settings for QGIS?
Some basic options for QGIS can be selected using the Options dialog. Select the menu option Settings ‣ Options. The tabs where you can customize your options are described below. Select the Style (QGIS restart required) and choose between ‘Oxygen’,’Windows’,’Motif’,’CDE’, ‘Plastique’ and ‘Cleanlooks’ ( ).
How to switch on and off QGIS widgets?
QGIS is highly configurable through the Settings menu. Choose between Panels, Toolbars, Project Properties, Options and Customization. In the Panels‣ menu, you can switch on and off QGIS widgets. The Toolbars‣ menu provides the possibility to switch on and off icon groups in the QGIS toolbar (see figure_panels_toolbars ).
How to copy features in QGIS to other applications?
Copy features as ‘Plain text, no geometry’, ‘Plain text, WKT geometry’, or ‘GeoJSON’ when pasting features in other applications. Attribute table behavior : set filter on the attribute table at the opening. There are three possibilities: ‘Show all features’, ‘Show selected features’ and ‘Show features visible on map’.