QGIS Python Programming Cookbook - Second Edition

Creating inverted polygon shapeburst fills

Shapeburst fills are a type of symbol layer that allows you to create buffered gradient fills. They are commonly used to shade water features in a realistic fashion, using different hues of blue to simulate water depth changes. In this recipe, we'll do exactly that. We'll use a land shapefile and a water shapefile, and in the water feature, we'll color it a darker blue toward the middle and lighter blue toward the edges to give the illusion of deeper water in the middle.

Getting ready

Download the following zipped set of shapefiles. Extract them into a directory named hancock in your qgis_data directory:

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

How to do it...

We will create ...