Zooming from python console of QGIS

Question

What are the commands to apply all types of zoom (full, on selected layer, etc.) in python console? I'm searching both on pyqgis cookbook and API documentantion, but I'm not finding anything interesting.

Not sure please check out http://www.qgis.org/pyqgis-cookbook/canvas.html#embedding-map-canvas & QGIS API doc (http://www.qgis.org/api/index.html) — Sunil, Mar 06 '13 at 12:11

score 19 · Answer 1 · answered Mar 06 '13 at 12:27

19

After getting around cookbook, the best place to learn is referring the QGis API Documentation. In this case we are looking for zoom functions, which are related to map canvas. So check if QgsMapCanvas class contains something.

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Zoom functions available in QGis are provided in QgsMapCanvas Class.

>>> canvas = qgis.utils.iface.mapCanvas()
>>> canvas.zoomIn()
>>> canvas.zoomOut()
>>> canvas.zoomToFullExtent()

answered Mar 06 '13 at 12:27

vinayan

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How to you get to qgis.utils.iface.mapCanvas() from QgsMapCanvas? I tried to to a = QgsMapCanvas() and then a.zoomIn() but it doesnt do anything. Thanks – user1655130 May 07 '21 at 09:03
You can just use iface.mapCanvas(). – bugmenot123 Jul 15 '21 at 14:24

score 6 · Answer 2 · answered Oct 20 '16 at 06:30

6

All the zoom options under the 'View' menu can be executed in the python console by the following code.

eMenu = self.iface.viewMenu()
eMenu.actions() [index].trigger()

Replace the "index" with the index number of the zoom action you want to perform. For eg., To perform 'zoom to selected features', use

eMenu.actions() [12].trigger()

answered Oct 20 '16 at 06:30

Sjs

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How do you know that the number 12 denotes 'zoom to selected features'? – Anthony Stokes Jan 11 '17 at 03:28
You better use iface.actionZoomToSelected().trigger() instead! – bugmenot123 Jul 15 '21 at 14:27

Zooming from python console of QGIS

2 Answers2

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