QGIS Python Programming Cookbook - Second Edition

Adding a line feature to a vector layer

Adding a line to a vector layer in QGIS is identical to adding a single point, but you just add more points to the QgsGeometry object.

Getting ready

For this recipe, you will need to download a zipped line shapefile containing two line features from the following URL:

https://github.com/GeospatialPython/Learn/raw/master/paths.zip

Extract the ZIP file to a directory named paths in your /qgis_data directory.

How to do it...

We will load the line layer from the shapefile, build a list of points, create a new geometry object and add the points as a line, create a new feature, set the geometry, and add it to the layer's data provider. Finally, we will update the extents of the layer to make sure the bounding box ...