def __init__(self, iface):
# Save reference to the QGIS interface
self.iface = iface
# create the map tool to draw a line
self.lineDrawer = LineDrawer(self.iface.mapCanvas())
QObject.connect(self.lineDrawer, SIGNAL("editingFinished()"),
self.splitSelectedFeatures)
def initGui(self):
# Create action that will start plugin configuration
self.action = QAction(QIcon(":/plugins/split_features_example5_solution/icon.png"), \
"Split features", self.iface.mainWindow())
# connect the action to the run method
QObject.connect(self.action, SIGNAL("triggered()"), self.run)
# Add toolbar button and menu item
self.iface.addToolBarIcon(self.action)
self.iface.addPluginToMenu("QGis Workshop", self.action)
# create the map tool to draw a line
self.lineDrawer = LineDrawer(self.iface.mapCanvas())
QObject.connect(self.lineDrawer, SIGNAL("editingFinished()"),
self.splitSelectedFeatures)
def initGui(self):
# Create action that will start plugin configuration
self.action = QAction(QIcon(":/plugins/split_features_example5_solution/icon.png"), \
"Split features", self.iface.mainWindow())
# connect the action to the run method
QObject.connect(self.action, SIGNAL("triggered()"), self.run)
# Add toolbar button and menu item
self.iface.addToolBarIcon(self.action)
self.iface.addPluginToMenu("QGis Workshop", self.action)
# create the map tool to draw a line
self.lineDrawer = LineDrawer( self.iface.mapCanvas() )
QObject.connect( self.lineDrawer, SIGNAL("editingFinished()"), self.splitSelectedFeatures )
class split_features_example5_solution:
def __init__(self, iface):
# Save reference to the QGIS interface
self.iface = iface
def initGui(self):
# Create action that will start plugin configuration
self.action = QAction(QIcon(":/plugins/split_features_example5_solution/icon.png"), \
"Split features", self.iface.mainWindow())
# connect the action to the run method
QObject.connect(self.action, SIGNAL("triggered()"), self.run)
# Add toolbar button and menu item
self.iface.addToolBarIcon(self.action)
self.iface.addPluginToMenu("QGis Workshop", self.action)
# create the map tool to draw a line
self.lineDrawer = LineDrawer( self.iface.mapCanvas() )
QObject.connect( self.lineDrawer, SIGNAL("editingFinished()"), self.splitSelectedFeatures )
def unload(self):
# Remove the plugin menu item and icon
self.iface.removePluginMenu("QGis Workshop",self.action)
self.iface.removeToolBarIcon(self.action)
self.lineDrawer.delete()
del self.lineDrawer
def splitSelectedFeatures(self):
# get the drawn line
line = self.lineDrawer.geometry()
# remove the displayed line
self.lineDrawer.clear()
# check to make sure we have a selected vector layer containing lines
layer = self.iface.activeLayer()
if layer and layer.type() == QgsMapLayer.VectorLayer and layer.geometryType() == QGis.Polygon and len(layer.selectedFeatures()) > 0:
# convert the line to layer crs if needed
mapCrs = self.iface.mapCanvas().mapRenderer().destinationCrs()
if layer.crs() != mapCrs:
ct = QgsCoordinateTransform( mapCrs, layer.crs() )
if line.transform( ct ) != 0:
# error trasforming the line from map to layer CRS
return
# convert to polyline
line = line.asPolyline()
# Create a temporary layer in the same CRS of the input layer
vl = QgsVectorLayer("Polygon", "splitted features", "memory")
vl.setCrs( layer.crs() )
# put it in edit mode
vl.startEditing()
# add a distance attribute
vl.addAttribute( QgsField("parend id", QVariant.Int) )
# Loop through all the selected features
for feature in layer.selectedFeatures():
geom = feature.geometry()
(retval, newGeometries, topologyTestPoints) = geom.splitGeometry( line, False )
if retval == 1:
# no geometries was splitted
continue
changedGeometries = newGeometries + [geom]
for g in changedGeometries:
# Create a new QgsFeature, assign it the new geometry
# and put the distance into the distance field
fet = QgsFeature()
fet.setAttributeMap( { 0 : feature.id() } )
fet.setGeometry( g )
# store the feature into the temporary layer
vl.addFeature( fet )
# save the changes
vl.commitChanges()
# finally load the layer in canvas
QgsMapLayerRegistry.instance().addMapLayer( vl )
else:
QMessageBox.information(self.iface.mainWindow(), "Split features", "The tool works on the selected polygons of the active vector layer")
# run method that performs all the real work
def run(self):
# set the line drawer tool as active tool in canvas
self.iface.mapCanvas().setMapTool( self.lineDrawer )
class split_features_example5_solution:
def __init__(self, iface):
# Save reference to the QGIS interface
self.iface = iface
# create the map tool to draw a line
self.lineDrawer = LineDrawer(self.iface.mapCanvas())
QObject.connect(self.lineDrawer, SIGNAL("editingFinished()"),
self.splitSelectedFeatures)
def initGui(self):
# Create action that will start plugin configuration
self.action = QAction(QIcon(":/plugins/split_features_example5_solution/icon.png"), \
"Split features", self.iface.mainWindow())
# connect the action to the run method
QObject.connect(self.action, SIGNAL("triggered()"), self.run)
# Add toolbar button and menu item
self.iface.addToolBarIcon(self.action)
self.iface.addPluginToMenu("QGis Workshop", self.action)
def unload(self):
# Remove the plugin menu item and icon
self.iface.removePluginMenu("QGis Workshop", self.action)
self.iface.removeToolBarIcon(self.action)
self.lineDrawer.delete()
del self.lineDrawer
def splitSelectedFeatures(self):
# check to make sure we have a selected vector layer containing lines
layer = self.iface.activeLayer()
if layer and layer.type(
) == QgsMapLayer.VectorLayer and layer.geometryType() == QGis.Polygon:
import pdb
pyqtRemoveInputHook()
pdb.set_trace()
line = self.lineDrawer.geometry().asPolyline()
if len(line) == 0:
# empty line
return
# Create a temporary layer and put it in edit mode
vl = QgsVectorLayer("Polygon", "splitted features", "memory")
vl.startEditing()
# add a distance attribute
vl.addAttribute(QgsField("parend id", QVariant.Int))
# Loop through all the selected features
for feature in layer.selectedFeatures():
geom = feature.geometry()
(retval, newGeometries,
topologyTestPoints) = geom.splitGeometry(line, False)
if retval == 1: # nessuna spezzatura
continue
changedGeometries = newGeometries + [geom]
for g in changedGeometries:
# Create a new QgsFeature, assign it the new geometry
# and put the distance into the distance field
fet = QgsFeature()
fet.setAttributeMap({0: feature.id()})
fet.setGeometry(g)
# store the feature into the temporary layer
vl.addFeature(fet)
# save the changes
vl.commitChanges()
# finally load the layer in canvas
QgsMapLayerRegistry.instance().addMapLayer(vl)
else:
QMessageBox.information(
self.iface.mainWindow(), "Split features",
"The tool works on the selected polygons of the active vector layer"
)
# run method that performs all the real work
def run(self):
# set the line drawer tool as active tool in canvas
self.iface.mapCanvas().setMapTool(self.lineDrawer)
def __init__(self, iface):
# Save reference to the QGIS interface
self.iface = iface
# create the map tool to draw a line
self.lineDrawer = LineDrawer(self.iface.mapCanvas())
QObject.connect(self.lineDrawer, SIGNAL("editingFinished()"), self.splitSelectedFeatures)
