本文整理汇总了Python中qgis.core.QgsDatumTransform.datumTransformations方法的典型用法代码示例。如果您正苦于以下问题：Python QgsDatumTransform.datumTransformations方法的具体用法？Python QgsDatumTransform.datumTransformations怎么用？Python QgsDatumTransform.datumTransformations使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类qgis.core.QgsDatumTransform的用法示例。
在下文中一共展示了QgsDatumTransform.datumTransformations方法的3个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: testWriteReadXml
# 需要导入模块: from qgis.core import QgsDatumTransform [as 别名]
# 或者: from qgis.core.QgsDatumTransform import datumTransformations [as 别名]
def testWriteReadXml(self):
# setup a context
context = QgsCoordinateTransformContext()
source_id_1 = QgsDatumTransform.datumTransformations(QgsCoordinateReferenceSystem(4204),
QgsCoordinateReferenceSystem(4326))[0].sourceTransformId
dest_id_1 = QgsDatumTransform.datumTransformations(QgsCoordinateReferenceSystem(4204),
QgsCoordinateReferenceSystem(4326))[0].destinationTransformId
source_id_2 = QgsDatumTransform.datumTransformations(QgsCoordinateReferenceSystem(4205),
QgsCoordinateReferenceSystem(4326))[0].sourceTransformId
dest_id_2 = QgsDatumTransform.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'): QgsDatumTransform.TransformPair(source_id_1, dest_id_1),
('EPSG:4205', 'EPSG:4326'): QgsDatumTransform.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'): QgsDatumTransform.TransformPair(source_id_1, dest_id_1),
('EPSG:4205', 'EPSG:4326'): QgsDatumTransform.TransformPair(source_id_2, dest_id_2)})示例2: testTransformInfo
# 需要导入模块: from qgis.core import QgsDatumTransform [as 别名]
# 或者: from qgis.core.QgsDatumTransform import datumTransformations [as 别名]
def testTransformInfo(self):
# hopefully this transform is available on all platforms!
transforms = QgsDatumTransform.datumTransformations(QgsCoordinateReferenceSystem(4613), QgsCoordinateReferenceSystem(4326))
self.assertTrue(len(transforms) > 0)
self.assertIn('+towgs84=-403,684,41', [QgsDatumTransform.datumTransformToProj(t.sourceTransformId) for t in transforms])
self.assertEqual([''] * len(transforms), [QgsDatumTransform.datumTransformToProj(t.destinationTransformId) for t in transforms])
self.assertIn('EPSG:4613', [QgsDatumTransform.datumTransformInfo(t.sourceTransformId).sourceCrsAuthId for t in
transforms])
self.assertEqual([''] * len(transforms), [QgsDatumTransform.datumTransformInfo(t.destinationTransformId).destinationCrsAuthId for t in
transforms])
# and the reverse
transforms = QgsDatumTransform.datumTransformations(QgsCoordinateReferenceSystem(4326), QgsCoordinateReferenceSystem(4613))
self.assertTrue(len(transforms) > 0)
self.assertEqual([''] * len(transforms), [QgsDatumTransform.datumTransformToProj(t.sourceTransformId) for t in transforms])
self.assertIn('+towgs84=-403,684,41',
[QgsDatumTransform.datumTransformToProj(t.destinationTransformId) for t in transforms])
self.assertEqual([''] * len(transforms), [QgsDatumTransform.datumTransformInfo(t.sourceTransformId).destinationCrsAuthId for t in
transforms])
self.assertIn('EPSG:4613', [QgsDatumTransform.datumTransformInfo(t.destinationTransformId).sourceCrsAuthId for t in
transforms])示例3: testReadWriteSettings
# 需要导入模块: from qgis.core import QgsDatumTransform [as 别名]
# 或者: from qgis.core.QgsDatumTransform import datumTransformations [as 别名]
def testReadWriteSettings(self):
context = QgsCoordinateTransformContext()
context.readSettings()
source_id_1 = QgsDatumTransform.datumTransformations(QgsCoordinateReferenceSystem(4204),
QgsCoordinateReferenceSystem(4326))[0].sourceTransformId
dest_id_1 = QgsDatumTransform.datumTransformations(QgsCoordinateReferenceSystem(4204),
QgsCoordinateReferenceSystem(4326))[0].destinationTransformId
source_id_2 = QgsDatumTransform.datumTransformations(QgsCoordinateReferenceSystem(4205),
QgsCoordinateReferenceSystem(4326))[0].sourceTransformId
dest_id_2 = QgsDatumTransform.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'): QgsDatumTransform.TransformPair(source_id_1, dest_id_1),
('EPSG:4205', 'EPSG:4326'): QgsDatumTransform.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'): QgsDatumTransform.TransformPair(source_id_1, dest_id_1),
('EPSG:4205', 'EPSG:4326'): QgsDatumTransform.TransformPair(source_id_2, dest_id_2)})