本文整理汇总了Python中qgis.core.QgsLayerDefinition类的典型用法代码示例。如果您正苦于以下问题:Python QgsLayerDefinition类的具体用法?Python QgsLayerDefinition怎么用?Python QgsLayerDefinition使用的例子?那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。
在下文中一共展示了QgsLayerDefinition类的5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: load_qlr_file
def load_qlr_file(self, path):
# Load qlr into a group owned by us
try:
group = QgsLayerTreeGroup()
# On Windows this locks the parent dirs indefinitely
# See http://hub.qgis.org/issues/14811
# QgsLayerDefinition.loadLayerDefinition(path, group)
# Instead handle file ourselves
f = QFile(path)
if not f.open(QIODevice.ReadOnly):
return False
try:
doc = QDomDocument()
if not doc.setContent( f.readAll() ):
return False
QgsLayerDefinition.loadLayerDefinition(doc, group)
finally:
f.close()
# Get subtree of nodes
nodes = group.children()
# plain list of nodes
nodeslist = []
for addedNode in nodes:
internalid = self._random_string()
nodeinfo = {'internalid': internalid}
addedNode.setCustomProperty(QlrManager.customPropertyName, internalid)
if isinstance(addedNode, QgsLayerTreeGroup):
nodeinfo['type'] = 'group'
nodeinfo['name'] = addedNode.name()
elif isinstance(addedNode, QgsLayerTreeLayer):
nodeinfo['type'] = 'layer'
nodeinfo['name'] = addedNode.layerName()
nodeinfo['layerid'] = addedNode.layerId()
nodeslist.append(nodeinfo)
# Remove from parent node. Otherwise we cant add it to a new parent
group.takeChild(addedNode)
self.fileSystemItemToLegendNode[path] = nodeslist
# Insert them into the main project
QgsProject.instance().layerTreeRoot().insertChildNodes(0, nodes)
return True
except:
# For now just return silently
return False
示例2: testVectorAndRaster
def testVectorAndRaster(self):
# Load a simple QLR containing a vector layer and a raster layer.
QgsProject.instance().removeAllMapLayers()
layers = QgsProject.instance().mapLayers()
self.assertEqual(len(layers), 0)
(result, errMsg) = QgsLayerDefinition.loadLayerDefinition(TEST_DATA_DIR + '/vector_and_raster.qlr', QgsProject.instance(), QgsProject.instance().layerTreeRoot())
self.assertTrue(result)
layers = QgsProject.instance().mapLayers()
self.assertEqual(len(layers), 2)
QgsProject.instance().removeAllMapLayers()
示例3: testInvalidSource
def testInvalidSource(self):
# Load a QLR containing a vector layer with a broken path
QgsProject.instance().removeAllMapLayers()
layers = QgsProject.instance().mapLayers()
self.assertEqual(len(layers), 0)
(result, errMsg) = QgsLayerDefinition.loadLayerDefinition(TEST_DATA_DIR + '/invalid_source.qlr', QgsProject.instance(), QgsProject.instance().layerTreeRoot())
self.assertTrue(result)
self.assertFalse(errMsg)
layers = QgsProject.instance().mapLayers()
self.assertEqual(len(layers), 1)
self.assertFalse(list(layers.values())[0].isValid())
QgsProject.instance().removeAllMapLayers()
示例4: test_layerDefinitionRewriteId
def test_layerDefinitionRewriteId(self):
tmpfile = os.path.join(tempfile.tempdir, "test.qlr")
ltr = QgsProject.instance().layerTreeRoot()
self.pointsLayer.setDependencies([QgsMapLayerDependency(self.linesLayer.id())])
QgsLayerDefinition.exportLayerDefinition(tmpfile, [ltr])
grp = ltr.addGroup("imported")
QgsLayerDefinition.loadLayerDefinition(tmpfile, grp)
newPointsLayer = None
newLinesLayer = None
for l in grp.findLayers():
if l.layerId().startswith('points'):
newPointsLayer = l.layer()
elif l.layerId().startswith('lines'):
newLinesLayer = l.layer()
self.assertFalse(newPointsLayer is None)
self.assertFalse(newLinesLayer is None)
self.assertTrue(newLinesLayer.id() in [dep.layerId() for dep in newPointsLayer.dependencies()])
self.pointsLayer.setDependencies([])
示例5: testSaveFields
def testSaveFields(self):
# Create a new py layerwith no fields
myPyLayer = QgsVectorLayer(
('Point?crs=epsg:4326&index=yes'),
'test',
'pythonprovider')
# Add some fields to the layer
myFields = [QgsField('TestInt', QVariant.Int, 'integer', 2, 0),
QgsField('TestLong', QVariant.LongLong, 'long', -1, 0),
QgsField('TestDbl', QVariant.Double, 'double', 8, 6),
QgsField('TestString', QVariant.String, 'string', 50, 0),
QgsField('TestDate', QVariant.Date, 'date'),
QgsField('TestTime', QVariant.Time, 'time'),
QgsField('TestDateTime', QVariant.DateTime, 'datetime')]
assert myPyLayer.startEditing()
for f in myFields:
assert myPyLayer.addAttribute(f)
assert myPyLayer.commitChanges()
myPyLayer.updateFields()
# Export the layer to a layer-definition-XML
qlr = QgsLayerDefinition.exportLayerDefinitionLayers([myPyLayer], QgsReadWriteContext())
assert qlr is not None
# Import the layer from the layer-definition-XML
layers = QgsLayerDefinition.loadLayerDefinitionLayers(qlr, QgsReadWriteContext())
assert layers is not None
myImportedLayer = layers[0]
assert myImportedLayer is not None
# Check for the presence of the fields
importedFields = myImportedLayer.fields()
assert importedFields is not None
for f in myFields:
assert f == importedFields.field(f.name())