本文整理汇总了Python中qgis.utils.iface.mapCanvas函数的典型用法代码示例。如果您正苦于以下问题:Python mapCanvas函数的具体用法?Python mapCanvas怎么用?Python mapCanvas使用的例子?那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。
在下文中一共展示了mapCanvas函数的15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: loadLayerTable
def loadLayerTable(self, carhabLayer, tableName):
# Retrieve layer from provider.
uri = QgsDataSourceURI()
uri.setDatabase(carhabLayer.dbPath)
schema = ''
geom_column = 'the_geom'
uri.setDataSource(schema, tableName, geom_column)
display_name = carhabLayer.getName()+'_'+tableName
layer = QgsVectorLayer(uri.uri(), display_name, 'spatialite')
crsType = QgsCoordinateReferenceSystem.EpsgCrsId
crsVal = 2154
crs = QgsCoordinateReferenceSystem(crsVal, crsType)
layer.setCrs(crs)
# "Bind" layer to carhab layer.
if self.getCarhabLayerByDbPath(carhabLayer.dbPath):
layer.setCustomProperty('carhabLayer', carhabLayer.id)
# Add layer to map (False to add to group)
QgsMapLayerRegistry.instance().addMapLayer(layer, False)
iface.mapCanvas().setExtent(layer.extent())
return layer
示例2: setExpressionObj
def setExpressionObj(self):
#set expression calculator if not empty
self.expA = dict()
self.expB = dict()
if bool(self.expressionLayerA) or bool(self.expressionLayerB):
if bool(self.expressionLayerA):
for field in self.expressionLayerA.keys():
tempDict = {'exp':None,'val':None}
tempDict['exp'] = QgsExpression(self.expressionLayerA[field])
da = QgsDistanceArea()
da.setSourceCrs(self.vproviderA.crs().srsid())
canvas = iface.mapCanvas()
da.setEllipsoidalMode(canvas.mapRenderer().hasCrsTransformEnabled())
da.setEllipsoid(QgsProject.instance().readEntry('Measure',
'/Ellipsoid',
GEO_NONE)[0])
tempDict['exp'].setGeomCalculator(da)
self.expA[field] = tempDict
else:
for field in self.expressionLayerB.keys():
tempDict = {'exp':None,'val':None}
tempDict['exp'] = QgsExpression(self.expressionLayerB[field])
da = QgsDistanceArea()
da.setSourceCrs(self.vproviderA.crs().srsid())
canvas = iface.mapCanvas()
da.setEllipsoidalMode(canvas.mapRenderer().hasCrsTransformEnabled())
da.setEllipsoid(QgsProject.instance().readEntry('Measure',
'/Ellipsoid',
GEO_NONE)[0])
tempDict['exp'].setGeomCalculator(da)
self.expB[self.mapBFields[field]] = tempDict
示例3: change_color
def change_color():
active_layer = iface.activeLayer()
renderer = active_layer.rendererV2()
symbol = renderer.symbol()
symbol.setColor(QColor(Qt.red))
iface.mapCanvas().refresh()
iface.legendInterface().refreshLayerSymbology(active_layer)
示例4: checkSettings
def checkSettings(self):
s = QSettings()
# pixmap preview width
self.previewWidth = s.value('TileIndexPlugin/previewWidth', 1000, type=int)
# activate/deactivate map canvas event filter
self.transparentFix = ( s.value('TileIndexPlugin/transparentFix', True, type=bool ) == True )
# activate/deactivate map canvas event filter
if s.value('TileIndexPlugin/contextMenu', True, type=bool):
if not self.filterActive:
iface.mapCanvas().installEventFilter(self)
self.filterActive = True
else:
if self.filterActive:
iface.mapCanvas().removeEventFilter(self)
self.filterActive = False
# which attribute(s) should we look for to get raster file names?
self.locationAttr=['location']
if s.value('TileIndexPlugin/attribute', False, type=bool):
# TODO change this
attr=s.value('TileIndexPlugin/attributeStr', '', type=str).split(' ') #,QString.SkipEmptyParts)
for a in attr:
self.locationAttr.append(a)
示例5: processAlgorithm
def processAlgorithm(self, feedback):
fileName = self.getParameterValue(self.INPUT)
layer = dataobjects.getObjectFromUri(fileName)
crs = QgsCoordinateReferenceSystem(self.getParameterValue(self.CRS))
provider = layer.dataProvider()
ds = provider.dataSourceUri()
p = re.compile("\|.*")
dsPath = p.sub("", ds)
if dsPath.lower().endswith(".shp"):
dsPath = dsPath[:-4]
wkt = crs.toWkt()
with open(dsPath + ".prj", "w") as f:
f.write(wkt)
qpjFile = dsPath + ".qpj"
if os.path.exists(qpjFile):
with open(qpjFile, "w") as f:
f.write(wkt)
layer.setCrs(crs)
iface.mapCanvas().refresh()
self.setOutputValue(self.OUTPUT, fileName)
示例6: db_view_change_style
def db_view_change_style():
in_file =open(os.getenv("HOME")+'/.qgis2/python/plugins/Cxf_in/setting.sty', 'r')
for line in in_file:
if line[:4]=="att:":
dirstili=line.split (":",2)[2].replace("\n","")
if(os.path.exists(dirstili) ==False):
dirstili= os.getenv("HOME")+'/.qgis2/python/plugins/Cxf_in/QML_Default'
in_file.close()
layers = iface.legendInterface().layers()
for layer in layers:
if layer.name() == "Particelle":
layer.loadNamedStyle(dirstili+'/part.qml')
elif layer.name() == "Fabbricati":
layer.loadNamedStyle(dirstili+'/fab.qml')
elif layer.name() == "Strade":
layer.loadNamedStyle(dirstili+'/strade.qml')
elif layer.name() == "Confine":
layer.loadNamedStyle(dirstili+'/conf.qml')
elif layer.name() == "Acque":
layer.loadNamedStyle(dirstili+'/acque.qml')
elif layer.name() == "Linee":
layer.loadNamedStyle(dirstili+'/linee.qml')
elif layer.name() == "Simboli":
layer.loadNamedStyle(dirstili+'/Simboli.qml')
elif layer.name() == "Testi":
layer.loadNamedStyle(dirstili+'/testo.qml')
elif layer.name() == "Fiduciali":
layer.loadNamedStyle(dirstili+'/fidu.qml')
iface.mapCanvas().refresh()
示例7: picker_clicked
def picker_clicked(self):
if iface.mapCanvas().mapTool() != self.tool:
self.pick_mode = self.PICK_MAP
iface.mapCanvas().setMapTool(self.tool)
self.clear_plot()
else:
self.stop_picking()
示例8: get_bounding_box
def get_bounding_box(self):
"""
Get the geometry of the bbox in WGS84
@rtype: QGsRectangle in WGS84
@return: the extent of the map canvas
"""
# If mapCanvas is checked
if self.radioButton_extentMapCanvas.isChecked():
geom_extent = iface.mapCanvas().extent()
if hasattr(iface.mapCanvas(), "mapSettings"):
source_crs = iface.mapCanvas().mapSettings().destinationCrs()
else:
source_crs = iface.mapCanvas().mapRenderer().destinationCrs()
else:
# Else if a layer is checked
layer = self.comboBox_extentLayer.currentLayer()
geom_extent = layer.extent()
source_crs = layer.crs()
geom_extent = QgsGeometry.fromRect(geom_extent)
epsg_4326 = QgsCoordinateReferenceSystem('EPSG:4326')
crs_transform = QgsCoordinateTransform(source_crs, epsg_4326)
geom_extent.transform(crs_transform)
return geom_extent.boundingBox()
示例9: get_bounding_box
def get_bounding_box(self):
"""
Get the geometry of the bbox in WGS84
@rtype: QGsRectangle in WGS84
@return: the extent of the map canvas
"""
# If mapCanvas is checked
if self.radioButton_extentMapCanvas.isChecked():
geom_extent = iface.mapCanvas().extent()
if hasattr(iface.mapCanvas(), "mapSettings"):
source_crs = iface.mapCanvas().mapSettings().destinationCrs()
else:
source_crs = iface.mapCanvas().mapRenderer().destinationCrs()
else:
# Else if a layer is checked
index = self.comboBox_extentLayer.currentIndex()
layer_id = self.comboBox_extentLayer.itemData(index)
layers = iface.legendInterface().layers()
for layer in layers:
if layer.id() == layer_id:
geom_extent = layer.extent()
source_crs = layer.crs()
break
else:
# the layer could be deleted before
layer_name = self.comboBox_extentLayer.itemText(index)
raise NoLayerException(suffix=layer_name)
geom_extent = QgsGeometry.fromRect(geom_extent)
epsg_4326 = QgsCoordinateReferenceSystem('EPSG:4326')
crs_transform = QgsCoordinateTransform(source_crs, epsg_4326)
geom_extent.transform(crs_transform)
return geom_extent.boundingBox()
示例10: viewsel
def viewsel( self ):
#ocon = sqlite3.connect(globals.dbName)
ocur = globals.ocon.cursor()
ocur.execute("select distinct Nomefile,Sel from " + globals.schema + "selezione order by Nomefile")
lista="("
for d in ocur:
if d[1] == "1":
lista+="'"+d[0]+"',"
lista=lista[:-1]+")"
if lista!=")":
lista="Nomefile IN "+lista
if self.ui.singolfg.isChecked() :
lista = lista + " AND ((EXT='') or (Ext is Null))"
db_view_sel(self,lista)
else:
lista="Nomefile=='9999'"
db_view_sel(self,lista)
iface.mapCanvas().zoomToFullExtent()
示例11: show_neighbors
def show_neighbors(skip):
layer_neighbors = get_layer(LAYER_NEIGHBORS)
layer_vols = get_layer(LAYER_VOLUMES)
features = load_feature_dict_id(layer_neighbors)
features_uuid = load_feature_dict_UUID(layer_vols)
idx = 0
for f in features.values():
# Skip first elements.
if idx < skip:
idx += 1
continue
neighbors = f[FIELD_NEIGHBORS_UUID].split(",")
selection = []
for x in neighbors:
selection.append(features_uuid[x].id())
layer_vols.setSelectedFeatures(selection)
box = layer_vols.boundingBoxOfSelected()
iface.mapCanvas().setExtent(box)
iface.mapCanvas().refresh()
reply = QMessageBox.question(
None, "Message", "Continue?\n (seeing feature " + str(idx) + ")", QMessageBox.No, QMessageBox.Yes
)
if reply == QMessageBox.No:
break
idx += 1
示例12: useLayerExtent
def useLayerExtent(self):
CANVAS_KEY = "Use canvas extent"
extentsDict = {}
extentsDict[CANVAS_KEY] = {
"extent": iface.mapCanvas().extent(),
"authid": iface.mapCanvas().mapSettings().destinationCrs().authid(),
}
extents = [CANVAS_KEY]
layers = dataobjects.getAllLayers()
for layer in layers:
authid = layer.crs().authid()
if ProcessingConfig.getSetting(ProcessingConfig.SHOW_CRS_DEF) and authid is not None:
layerName = u"{} [{}]".format(layer.name(), authid)
else:
layerName = layer.name()
extents.append(layerName)
extentsDict[layerName] = {"extent": layer.extent(), "authid": authid}
(item, ok) = QInputDialog.getItem(self, self.tr("Select extent"), self.tr("Use extent from"), extents, False)
if ok:
self.setValueFromRect(extentsDict[item]["extent"])
if extentsDict[item]["authid"] != iface.mapCanvas().mapSettings().destinationCrs().authid():
iface.messageBar().pushMessage(
self.tr("Warning"),
self.tr(
"The projection of the chosen layer is not the same as canvas projection! The selected extent might not be what was intended."
),
QgsMessageBar.WARNING,
8,
)
示例13: filterLayer
def filterLayer(layerName, criteria):
lyrs = QgsMapLayerRegistry.instance().mapLayers()
schema = ''
for l in lyrs:
if QgsMapLayerRegistry.instance().mapLayer(l).name() == layerName:
desc=layers[layerName]
uri = QgsDataSourceURI()
uri.setDatabase(root+desc[0])
schema = ''
table = desc[1]
geom_column = desc[2]
uri.setDataSource(schema, table, geom_column, criteria)
layer=QgsMapLayerRegistry.instance().mapLayer(l)
print layer.dataProvider().dataSourceUri()
layer.dataProvider().setDataSourceUri(uri.uri())
layer.rendererV2().symbol().setAlpha(1)
QgsMapLayerRegistry.instance().reloadAllLayers()
layer.dataProvider().reloadData()
layer.dataProvider().forceReload()
layer.triggerRepaint()
QgsMapCanvas().refresh()
qgis.utils.iface.mapCanvas().refresh()
iface.mapCanvas().refresh()
#layer.setDataSource(uri.uri(), table, geom_column)
return
示例14: dms
def dms (lat, lon):
"""
Add a point at the lat and lon for the current layer using DMS notation
"""
lat,lon = lat, lon
l_lat = lat.upper().split()
l_lon = lon.upper().split()
# need to add validation tests
if l_lat[3] == 'N':
ddlat = float(l_lat[0])+(float(l_lat[1])/60)+float(l_lat[2])/3600
elif l_lat[3] == 'S':
ddlat = (float(l_lat[0])+float(l_lat[1])/60+float(l_lat[2])/3600)*-1
else:
ddlat = '0'
if l_lon [3] == 'E':
ddlon = float(l_lon[0])+float(l_lon[1])/60+float(l_lon[2])/3600
elif l_lon[3] == 'W':
ddlon = (float(l_lon[0])+float(l_lon[1])/60+float(l_lon[2])/3600)*-1
else:
ddlon = '0'
layer = iface.activeLayer()
f = QgsFeature(layer.pendingFields())
geom = QgsGeometry.fromPoint(QgsPoint(ddlon,ddlat))
f.setGeometry(geom)
layer.addFeature(f)
iface.mapCanvas().refresh()
示例15: manageFinished
def manageFinished(self, success, reason):
''' Do action after notify that alg is finished. These are the postprocessing steps
1) merge result to the output layer
2) add the layer to canvas in case it is new
3) notify edn of processing
4) terminate the thread
'''
# finish the thread
self.thread.quit()
# check result
if not success:
QgsMessageLog.logMessage('Failed execution: {}'.format(reason), 'QTraffic', QgsMessageLog.CRITICAL)
iface.messageBar().pushCritical('QTraffic', self.tr("Error executing the algorithm: {}".format(reason)))
return
# prepare result
try:
self.alg.addResultToLayer(self.outLayer)
except Exception as ex:
traceback.print_exc()
QgsMessageLog.logMessage('Cannot add result to layer: {}'.format(str(ex)), 'QTraffic', QgsMessageLog.CRITICAL)
iface.messageBar().pushCritical('QTraffic', self.tr("Cannot add result to layer"))
return
# add or refresh rsult vector layer
addToInputLayer = self.gui.addToOriginaLayer_RButton.isChecked()
if not addToInputLayer:
QgsMapLayerRegistry.instance().addMapLayer(self.outLayer)
iface.mapCanvas().refresh()
# notify the user the end of process
iface.messageBar().pushSuccess('QTraffic', self.tr('Alg terminated successfully'))