def testReadWriteSettings(self):
context = QgsCoordinateTransformContext()
context.readSettings()
source_id_1 = QgsCoordinateTransform.datumTransformations(
QgsCoordinateReferenceSystem(4204),
QgsCoordinateReferenceSystem(4326))[0].sourceTransformId
dest_id_1 = QgsCoordinateTransform.datumTransformations(
QgsCoordinateReferenceSystem(4204),
QgsCoordinateReferenceSystem(4326))[0].destinationTransformId
source_id_2 = QgsCoordinateTransform.datumTransformations(
QgsCoordinateReferenceSystem(4205),
QgsCoordinateReferenceSystem(4326))[0].sourceTransformId
dest_id_2 = QgsCoordinateTransform.datumTransformations(
QgsCoordinateReferenceSystem(4205),
QgsCoordinateReferenceSystem(4326))[0].destinationTransformId
# should be empty
self.assertEqual(context.sourceDestinationDatumTransforms(), {})
self.assertTrue(
context.addSourceDestinationDatumTransform(
QgsCoordinateReferenceSystem('EPSG:4204'),
QgsCoordinateReferenceSystem('EPSG:4326'), source_id_1,
dest_id_1))
self.assertTrue(
context.addSourceDestinationDatumTransform(
QgsCoordinateReferenceSystem('EPSG:4205'),
QgsCoordinateReferenceSystem(4326), source_id_2, dest_id_2))
self.assertEqual(
context.sourceDestinationDatumTransforms(), {
('EPSG:4204', 'EPSG:4326'):
QgsCoordinateTransform.TransformPair(source_id_1, dest_id_1),
('EPSG:4205', 'EPSG:4326'):
QgsCoordinateTransform.TransformPair(source_id_2, dest_id_2)
})
# save to settings
context.writeSettings()
# restore from settings
context2 = QgsCoordinateTransformContext()
self.assertEqual(context2.sourceDestinationDatumTransforms(), {})
context2.readSettings()
# check result
self.assertEqual(
context2.sourceDestinationDatumTransforms(), {
('EPSG:4204', 'EPSG:4326'):
QgsCoordinateTransform.TransformPair(source_id_1, dest_id_1),
('EPSG:4205', 'EPSG:4326'):
QgsCoordinateTransform.TransformPair(source_id_2, dest_id_2)
})
def testWriteReadXml(self):
# setup a context
context = QgsCoordinateTransformContext()
source_id_1 = QgsCoordinateTransform.datumTransformations(
QgsCoordinateReferenceSystem(4204),
QgsCoordinateReferenceSystem(4326))[0].sourceTransformId
dest_id_1 = QgsCoordinateTransform.datumTransformations(
QgsCoordinateReferenceSystem(4204),
QgsCoordinateReferenceSystem(4326))[0].destinationTransformId
source_id_2 = QgsCoordinateTransform.datumTransformations(
QgsCoordinateReferenceSystem(4205),
QgsCoordinateReferenceSystem(4326))[0].sourceTransformId
dest_id_2 = QgsCoordinateTransform.datumTransformations(
QgsCoordinateReferenceSystem(4205),
QgsCoordinateReferenceSystem(4326))[0].destinationTransformId
self.assertTrue(
context.addSourceDestinationDatumTransform(
QgsCoordinateReferenceSystem(4204),
QgsCoordinateReferenceSystem(4326), source_id_1, dest_id_1))
self.assertTrue(
context.addSourceDestinationDatumTransform(
QgsCoordinateReferenceSystem(4205),
QgsCoordinateReferenceSystem(4326), source_id_2, dest_id_2))
self.assertEqual(
context.sourceDestinationDatumTransforms(), {
('EPSG:4204', 'EPSG:4326'):
QgsCoordinateTransform.TransformPair(source_id_1, dest_id_1),
('EPSG:4205', 'EPSG:4326'):
QgsCoordinateTransform.TransformPair(source_id_2, dest_id_2)
})
# save to xml
doc = QDomDocument("testdoc")
elem = doc.createElement("test")
context.writeXml(elem, QgsReadWriteContext())
# restore from xml
context2 = QgsCoordinateTransformContext()
context2.readXml(elem, QgsReadWriteContext())
# check result
self.assertEqual(
context2.sourceDestinationDatumTransforms(), {
('EPSG:4204', 'EPSG:4326'):
QgsCoordinateTransform.TransformPair(source_id_1, dest_id_1),
('EPSG:4205', 'EPSG:4326'):
QgsCoordinateTransform.TransformPair(source_id_2, dest_id_2)
})
def testTransformInfo(self):
# hopefully this transform is available on all platforms!
transforms = QgsCoordinateTransform.datumTransformations(
QgsCoordinateReferenceSystem(4613),
QgsCoordinateReferenceSystem(4326))
self.assertTrue(len(transforms) > 0)
self.assertIn('+towgs84=-403,684,41', [
QgsCoordinateTransform.datumTransformToProj(t.sourceTransformId)
for t in transforms
])
self.assertIn('+towgs84=-403,684,41', [
QgsCoordinateTransform.datumTransformToProj(
t.destinationTransformId) for t in transforms
])
self.assertIn('EPSG:4613', [
QgsCoordinateTransform.datumTransformInfo(
t.destinationTransformId).sourceCrsAuthId for t in transforms
])
self.assertIn('EPSG:4326', [
QgsCoordinateTransform.datumTransformInfo(
t.destinationTransformId).destinationCrsAuthId
for t in transforms
])
