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How to get layer by name in pyqgis?
Instead of layer = self.iface.activeLayer (), do: If you don’t trust the layer name (after all, it can be changed by the user at any time), you could try to check the layer source. If your layer is a Shapefile, you could check the path to the Shapefile, this way:
How to use wkbtype in QGIS 3.0?
How can I use WKBType in QGIS 3.0? As you can see here, the enum QGis.WkbType becomes QgsWkbTypes.Type in QGIS v3. However, that would not be useful if you have, for instance, multi polygons.
How to set layer order in layer order panel?
You can set layer order in the Layer Order Panel ” manually ” using QgsLayerTreeCanvasBridge.setCustomLayerOrder () method, which receives an ordered list of layer ids. For instance (assuming you just loaded vlayer ):
How to tell if a layer is an active layer in Java?
You would just need to make sure your layer has a name you can distinguish from others. Instead of layer = self.iface.activeLayer (), do: If you don’t trust the layer name (after all, it can be changed by the user at any time), you could try to check the layer source.
How to iterate over selected features in pyqgis?
Iterate over a selection Once we have selected features, we may want to perform operations for only the selected features. This can be accomplished by iterating through only the layers that are selected. We can return the selected features with layer.selectedFeatures (), then iterate through those features.
How to create a vector layer in QGIS?
In the code editor, or console, create a variable containing the path to your vector file. Now we’ll simultaneously assign the vector layer to the layer variable and load it into the QGIS interface. This adds the layer into the QGIS interface.
How to select features from a vector layer?
This adds the layer into the QGIS interface. In the legend, the vecotr is labeled with the file name. There are multiple ways to select features from a shapefile (or other vector file). In this tutorial, we will cover selecting all features, selection by ID and selection by attribute values.