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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
Languages
Tools
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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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Toc

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

Adding standard map tools to the canvas

In this recipe, you'll learn how to add standard map navigation tools to a standalone map canvas. Creating the simplest possible interactive application provides a framework to begin building specialized geospatial applications using QGIS as a library.

Getting ready

Download the following 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...

We will walk you through the steps required to create a map canvas, add a layer to it, and then add some tools to zoom and pan the map, which are given as follows:

  1. First, because we are working outside the QGIS Python interpreter, we need to import some QGIS and Qt libraries:
            from qgis.gui import * 
            from qgis.core import * 
            from PyQt4.QtGui import * 
            from PyQt4.QtCore import SIGNAL, Qt 
            import sys, os 
    
  2. Then, we must set the location of our main QGIS application...
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