本文整理汇总了Python中qgis.core.QgsVectorLayer.reload方法的典型用法代码示例。如果您正苦于以下问题：Python QgsVectorLayer.reload方法的具体用法？Python QgsVectorLayer.reload怎么用？Python QgsVectorLayer.reload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.QgsVectorLayer的用法示例。
在下文中一共展示了QgsVectorLayer.reload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: test_lazy
# 需要导入模块: from qgis.core import QgsVectorLayer [as 别名]
# 或者: from qgis.core.QgsVectorLayer import reload [as 别名]
def test_lazy(self):
l1 = QgsVectorLayer(os.path.join(self.testDataDir, "france_parts.shp"), "françéà", "ogr", QgsVectorLayer.LayerOptions(False))
self.assertEqual(l1.isValid(), True)
QgsProject.instance().addMapLayer(l1)
df = QgsVirtualLayerDefinition()
df.setQuery('select * from "françéà"')
df.setLazy(True)
vl = QgsVectorLayer(df.toString(), "testq", "virtual")
self.assertEqual(vl.isValid(), True)
ids = [f.id() for f in vl.getFeatures()]
self.assertEqual(len(ids), 0)
vl.reload()
ids = [f.id() for f in vl.getFeatures()]
self.assertEqual(len(ids), 4)
QgsProject.instance().removeMapLayer(l1.id())示例2: points_along_line
# 需要导入模块: from qgis.core import QgsVectorLayer [as 别名]
# 或者: from qgis.core.QgsVectorLayer import reload [as 别名]
def points_along_line(layerout,
startpoint,
endpoint,
distance,
label,
layer,
selected_only=True,
force=False,
divide=0):
"""Adding Points along the line
"""
# Create a new memory layer and add a distance attribute self.layerNameLine
#layer_crs = virt_layer.setCrs(layer.crs())
virt_layer = QgsVectorLayer("Point?crs=%s" % layer.crs().authid(),
layerout,
"memory")
provider = virt_layer.dataProvider()
virt_layer.startEditing() # actually writes attributes
units = layer.crs().mapUnits()
unit_dic = {
QGis.Degrees: 'Degrees',
QGis.Meters: 'Meters',
QGis.Feet: 'Feet',
QGis.UnknownUnit: 'Unknown'}
unit = unit_dic.get(units, 'Unknown')
provider.addAttributes([QgsField("fid", QVariant.Int)])
provider.addAttributes([QgsField("cng_("+unit+")", QVariant.Int)])
def get_features():
"""Getting the features
"""
if selected_only:
return layer.selectedFeatures()
else:
return layer.getFeatures()
# Loop through all (selected) features
for feature in get_features():
geom = feature.geometry()
# Add feature ID of selected feature
fid = feature.id()
if not geom:
QgsMessageLog.logMessage("No geometry", "QChainage")
continue
features = create_points_at(startpoint, endpoint, distance, geom,
fid, force, divide)
provider.addFeatures(features)
virt_layer.updateExtents()
QgsMapLayerRegistry.instance().addMapLayers([virt_layer])
virt_layer.commitChanges()
virt_layer.reload()
#from here Add labeling
#generic labeling properties
if label:
virt_layer.setCustomProperty("labeling", "pal")
virt_layer.setCustomProperty("labeling/enabled", "true")
virt_layer.setCustomProperty("labeling/fieldName", "cng_("+unit+")")
virt_layer.setCustomProperty("labeling/fontSize", "10")
virt_layer.setCustomProperty("labeling/multiLineLabels", "true")
#virt_layer.setCustomProperty("labeling/Size", "5")
# symbol = QgsMarkerSymbolV2.createSimple({"name": "capital"})
# virt_layer.setRendererV2(QgsSingleSymbolRendererV2(symbol))
virt_layer.triggerRepaint()
return示例3: testSubsetStringFids
# 需要导入模块: from qgis.core import QgsVectorLayer [as 别名]
# 或者: from qgis.core.QgsVectorLayer import reload [as 别名]
def testSubsetStringFids(self):
"""
- tests that feature ids are stable even if a subset string is set
- tests that the subset string is correctly set on the ogr layer event when reloading the data source (issue #17122)
"""
tmpfile = os.path.join(self.basetestpath, 'subsetStringFids.sqlite')
ds = ogr.GetDriverByName('SQLite').CreateDataSource(tmpfile)
lyr = ds.CreateLayer('test', geom_type=ogr.wkbPoint, options=['FID=fid'])
lyr.CreateField(ogr.FieldDefn('type', ogr.OFTInteger))
lyr.CreateField(ogr.FieldDefn('value', ogr.OFTInteger))
f = ogr.Feature(lyr.GetLayerDefn())
f.SetFID(0)
f.SetField(0, 1)
f.SetField(1, 11)
f.SetGeometry(ogr.CreateGeometryFromWkt('Point (0 0)'))
lyr.CreateFeature(f)
f = ogr.Feature(lyr.GetLayerDefn())
f.SetFID(1)
f.SetField(0, 1)
f.SetField(1, 12)
f.SetGeometry(ogr.CreateGeometryFromWkt('Point (1 1)'))
lyr.CreateFeature(f)
f = ogr.Feature(lyr.GetLayerDefn())
f.SetFID(2)
f.SetField(0, 1)
f.SetField(1, 13)
f.SetGeometry(ogr.CreateGeometryFromWkt('Point (2 2)'))
lyr.CreateFeature(f)
f = ogr.Feature(lyr.GetLayerDefn())
f.SetFID(3)
f.SetField(0, 2)
f.SetField(1, 14)
f.SetGeometry(ogr.CreateGeometryFromWkt('Point (3 3)'))
lyr.CreateFeature(f)
f = ogr.Feature(lyr.GetLayerDefn())
f.SetFID(4)
f.SetField(0, 2)
f.SetField(1, 15)
f.SetGeometry(ogr.CreateGeometryFromWkt('Point (4 4)'))
lyr.CreateFeature(f)
f = ogr.Feature(lyr.GetLayerDefn())
f.SetFID(5)
f.SetField(0, 2)
f.SetField(1, 16)
f.SetGeometry(ogr.CreateGeometryFromWkt('Point (5 5)'))
lyr.CreateFeature(f)
f = None
ds = None
vl = QgsVectorLayer(tmpfile, 'test', 'ogr')
self.assertTrue(vl.isValid())
self.assertEqual([f.name() for f in vl.fields()], ['fid', 'type', 'value'])
original_fields = vl.fields()
vl = QgsVectorLayer(tmpfile + "|subset=type=2", 'test', 'ogr')
self.assertTrue(vl.isValid())
def run_checks():
self.assertEqual([f.name() for f in vl.fields()], ['fid', 'type', 'value'])
# expression
req = QgsFeatureRequest()
req.setFilterExpression("value=16")
it = vl.getFeatures(req)
f = QgsFeature()
self.assertTrue(it.nextFeature(f))
self.assertEqual(f.id(), 5)
self.assertEqual(f.attributes(), [5, 2, 16])
self.assertEqual([field.name() for field in f.fields()], ['fid', 'type', 'value'])
self.assertEqual(f.geometry().asWkt(), 'Point (5 5)')
# filter fid
req = QgsFeatureRequest()
req.setFilterFid(5)
it = vl.getFeatures(req)
f = QgsFeature()
self.assertTrue(it.nextFeature(f))
self.assertEqual(f.id(), 5)
self.assertEqual(f.attributes(), [5, 2, 16])
self.assertEqual([field.name() for field in f.fields()], ['fid', 'type', 'value'])
self.assertEqual(f.geometry().asWkt(), 'Point (5 5)')
# filter fids
req = QgsFeatureRequest()
req.setFilterFids([5])
it = vl.getFeatures(req)
f = QgsFeature()
self.assertTrue(it.nextFeature(f))
self.assertEqual(f.id(), 5)
self.assertEqual(f.attributes(), [5, 2, 16])
self.assertEqual([field.name() for field in f.fields()], ['fid', 'type', 'value'])
self.assertEqual(f.geometry().asWkt(), 'Point (5 5)')
# check with subset of attributes
req = QgsFeatureRequest()
req.setFilterFids([5])
req.setSubsetOfAttributes([2])
it = vl.getFeatures(req)
f = QgsFeature()
#.........这里部分代码省略.........