本文整理汇总了Python中qgis.core.QgsProject.removeAllMapLayers方法的典型用法代码示例。如果您正苦于以下问题：Python QgsProject.removeAllMapLayers方法的具体用法？Python QgsProject.removeAllMapLayers怎么用？Python QgsProject.removeAllMapLayers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.QgsProject的用法示例。
在下文中一共展示了QgsProject.removeAllMapLayers方法的1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: testStyles
# 需要导入模块: from qgis.core import QgsProject [as 别名]
# 或者: from qgis.core.QgsProject import removeAllMapLayers [as 别名]
def testStyles(self):
"""Test that styles for rasters and vectors are kept when setDataSource is called"""
temp_dir = QTemporaryDir()
p = QgsProject.instance()
for f in (
'bad_layer_raster_test.tfw',
'bad_layer_raster_test.tiff',
'bad_layer_raster_test.tiff.aux.xml',
'bad_layers_test.gpkg',
'good_layers_test.qgs'):
copyfile(os.path.join(TEST_DATA_DIR, 'projects', f), os.path.join(temp_dir.path(), f))
project_path = os.path.join(temp_dir.path(), 'good_layers_test.qgs')
p = QgsProject().instance()
p.removeAllMapLayers()
self.assertTrue(p.read(project_path))
self.assertEqual(p.count(), 4)
ms = self.getBaseMapSettings()
point_a_copy = list(p.mapLayersByName('point_a copy'))[0]
point_a = list(p.mapLayersByName('point_a'))[0]
point_b = list(p.mapLayersByName('point_b'))[0]
raster = list(p.mapLayersByName('bad_layer_raster_test'))[0]
self.assertTrue(point_a_copy.isValid())
self.assertTrue(point_a.isValid())
self.assertTrue(point_b.isValid())
self.assertTrue(raster.isValid())
ms.setExtent(QgsRectangle(2.81861, 41.98138, 2.81952, 41.9816))
ms.setLayers([point_a_copy, point_a, point_b, raster])
image = renderMapToImage(ms)
self.assertTrue(image.save(os.path.join(temp_dir.path(), 'expected.png'), 'PNG'))
point_a_source = point_a.publicSource()
point_b_source = point_b.publicSource()
raster_source = raster.publicSource()
self._change_data_source(point_a, point_a_source, 'ogr')
# Attention: we are not passing the subset string here:
self._change_data_source(point_a_copy, point_a_source, 'ogr')
self._change_data_source(point_b, point_b_source, 'ogr')
self._change_data_source(raster, raster_source, 'gdal')
self.assertTrue(image.save(os.path.join(temp_dir.path(), 'actual.png'), 'PNG'))
self.assertTrue(filecmp.cmp(os.path.join(temp_dir.path(), 'actual.png'), os.path.join(temp_dir.path(), 'expected.png')), False)
# Now build a bad project
p.removeAllMapLayers()
bad_project_path = os.path.join(temp_dir.path(), 'bad_layers_test.qgs')
with open(project_path, 'r') as infile:
with open(bad_project_path, 'w+') as outfile:
outfile.write(infile.read().replace('./bad_layers_test.', './bad_layers_test-BAD_SOURCE.').replace('bad_layer_raster_test.tiff', 'bad_layer_raster_test-BAD_SOURCE.tiff'))
p.removeAllMapLayers()
self.assertTrue(p.read(bad_project_path))
self.assertEqual(p.count(), 4)
point_a_copy = list(p.mapLayersByName('point_a copy'))[0]
point_a = list(p.mapLayersByName('point_a'))[0]
point_b = list(p.mapLayersByName('point_b'))[0]
raster = list(p.mapLayersByName('bad_layer_raster_test'))[0]
self.assertFalse(point_a.isValid())
self.assertFalse(point_a_copy.isValid())
self.assertFalse(point_b.isValid())
self.assertFalse(raster.isValid())
ms.setLayers([point_a_copy, point_a, point_b, raster])
image = renderMapToImage(ms)
self.assertTrue(image.save(os.path.join(temp_dir.path(), 'bad.png'), 'PNG'))
self.assertFalse(filecmp.cmp(os.path.join(temp_dir.path(), 'bad.png'), os.path.join(temp_dir.path(), 'expected.png')), False)
self._change_data_source(point_a, point_a_source, 'ogr')
# We are not passing the subset string!!
self._change_data_source(point_a_copy, point_a_source, 'ogr')
self._change_data_source(point_b, point_b_source, 'ogr')
self._change_data_source(raster, raster_source, 'gdal')
self.assertTrue(point_a.isValid())
self.assertTrue(point_a_copy.isValid())
self.assertTrue(point_b.isValid())
self.assertTrue(raster.isValid())
ms.setLayers([point_a_copy, point_a, point_b, raster])
image = renderMapToImage(ms)
self.assertTrue(image.save(os.path.join(temp_dir.path(), 'actual_fixed.png'), 'PNG'))
self.assertTrue(filecmp.cmp(os.path.join(temp_dir.path(), 'actual_fixed.png'), os.path.join(temp_dir.path(), 'expected.png')), False)