September 2016
Beginner to intermediate
486 pages
10h 56m
English
book
Mastering QGIS - Second Edition
by Kurt Menke, GISP, Paolo Corti, Richard Smith Jr., GISP, Luigi Pirelli, John Van Hoesen, GISP
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Exploring iface and QGis
The iface class used in the preceding snippets is important in every PyQGIS code; it is used to access most graphical QGIS components, from displayed layers to the toolbar buttons.
Note
The iface class is a Python wrapper for the C++ class, QgisInterface, which is documented at http://qgis.org/api/classQgisInterface.html. Most QGIS classes have a Qgs prefix. Some special classes can have the Qgis or QGis prefixes.
The prefix Qgs is the Qt namespace registered by Gary Sherman, the QGIS creator, so Qt (Q) and Gary Sherman (gs).
The most common use of the iface class is to get a reference of the canvas where maps are displayed:
canvas = iface.mapCanvas()
The class can also be used as a shortcut to load raster or vector layers; ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.