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I basically have the same question as: How to quickly calculate bounding box coordinates of a selected polygon with QGIS. However I am building a stand alone application in python and so do not have the iFace class. I can get to the extent class easily enough with :
box = layer2.extent()
OR box = self.map_canvas.extent()
Which gives me an object that claims it is an extent, but how do I get the coordinates out?
You could use something like the following to get the coordinates of your extent:
xmin = layer2.extent().xMinimum()
xmax = layer2.extent().xMaximum()
ymin = layer2.extent().yMinimum()
ymax = layer2.extent().yMaximum()
