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QGIS Python Programming Cookbook, Second Edition

You're reading from   QGIS Python Programming Cookbook, Second Edition Automating geospatial development

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Product type Paperback
Published in Mar 2017
Publisher Packt
ISBN-13 9781787124837
Length 464 pages
Edition 2nd Edition
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Author (1):
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Joel Lawhead Joel Lawhead
Author Profile Icon Joel Lawhead
Joel Lawhead
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Table of Contents (10) Chapters Close

Preface 1. Automating QGIS FREE CHAPTER 2. Querying Vector Data 3. Editing Vector Data 4. Using Raster Data 5. Creating Dynamic Maps 6. Composing Static Maps 7. Interacting with the User 8. QGIS Workflows 9. Other Tips and Tricks

Using a filled marker symbol


A newer feature of QGIS is filled marker symbols. Filled marker symbols are powerful features that allow you to use other symbols such as point markers, lines, and shape bursts, as a fill pattern for a polygon. Filled marker symbols allow for an endless set of options for rendering a polygon. In this recipe, we'll do a very simple filled marker symbol that paints a polygon with stars.

Getting ready

Download the zipped shapefile and extract it to your qgis_data directory into a folder named ms from https://github.com/GeospatialPython/Learn/raw/master/Mississippi.zip.

How to do it...

A filled marker symbol requires us to first create the representative star point marker symbol. Then, we'll add that symbol to the filled marker symbol and change it with the layer's default symbol. Finally, we'll repaint the layer to update the symbology:

  1. First, create the layer with our polygon shapefile:

            lyr = QgsVectorLayer("/qgis_data/ms/mississippi.shp",
                 ...
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