[Qgis-user] PyQGIS: Get project extent outside QGIS

[Jorge Gustavo Rocha]

Hi,

I want to read a project file and get the extent when the project was saved.

In QGIS,

iface.mapCanvas().extent()

does exactly what I want. But I want to run a script outside QGIS.

I've already tried:

QgsApplication.setPrefixPath("/usr", True)
qgs = QgsApplication([], False)
# Load providers
qgs.initQgis()

project = QgsProject.instance()
project.read(projectpath)

print(project.crs().authid())

root = project.layerTreeRoot()
canvas = QgsMapCanvas()

bridge = QgsLayerTreeMapCanvasBridge(root, canvas)

print(canvas.extent())
print(canvas.fullExtent())
print(canvas.mapSettings().extent())
print(canvas.mapSettings().fullExtent())
print(canvas.mapSettings().visibleExtent())

All of these extents are much wider than the canvas extent when the
project was saved.

The extent is there, in the project file. I can read it as XML and get
the extent.

  <mapcanvas annotationsVisible="1" name="theMapCanvas">
    <units>meters</units>
    <extent>
      <xmin>-22630.49319827121144044</xmin>
      <ymin>208610.29666395089589059</ymin>
      <xmax>-22314.35674389618725399</xmax>
      <ymax>208889.62023152899928391</ymax>
    </extent>

But I would like to use the API.

Thanks in advance,

Jorge

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