Contents
Where are the project properties in QGIS 2?
In the Settings > Project Properties > General tab, there is an option to use Absolute or Relative path. Please check for the screenshot above. Update: Since QGIS 2.0, the Project properties have moved from the Settings to the File menu.
How to create a QGIS plugin in Python?
Since QGIS is using Python 2.7, subdirectories of these paths have to contain an __init__.py file to be considered Python packages that can be imported as plugins. By setting QGIS_PLUGINPATH to an existing directory path, you can add this path to the list of paths that are searched for plugins.
How to access active layer of QGIS in Python?
Open it from Plugins > Python console or use the shortcut Ctrl+Alt+P on your keyboard. By default an iface object is imported, which allows the access to the currently active QGIS instance’s user interface. For example, we can easily retrieve the active (selected) layer, then access its type, name, and count its features:
How are user defined expressions used in QGIS?
Expressions in QGIS have a lot of power and are used in many core features – selection, calculating field values, styling, labelling etc. QGIS also has support for user-defined expressions. With a little bit of python programming, you can define your own functions that can be used within the expression engine.
What does an action do in a QGIS?
An action is something that happens when you click on a feature. It can add a lot of extra functionality to your map, allowing you to retrieve additional information about an object, for example. Assigning actions can add a whole new dimension to your map! The goal for this lesson: To learn how to add custom actions.
How to add an image to a QGIS list?
You want to open the image, and QGIS knows where the image is. All it needs to do is to tell the Action where the image is. Select image from the list: Click the Insert field button. QGIS will add the phrase [% “image” %] in the Action field. Click the Add to action list button.
How to remap one layer at a time in QGIS?
Then use change data source to remap all the layers to the project home folder (as QGIS does NOT save anything as relative at all. It saves all paths as absolute.) You have a great plugin named “ChangeDataSource”, doing just that very easily. The only downside is that you can only do one layer at a time.