def draw_layer(self, layer_name):
displayed = layer_name in self.layers
if displayed:
if self.layers[layer_name].isValid():
self.layers[layer_name].setCacheImage(None)
self.layers[layer_name].triggerRepaint()
return
# Specify the view and the column to use for the layer
self.uri.setDataSource('public', 'measure_formated', layer_name)
# Specify the primary key of the entries. For the record, the only unique column is measure_id
self.uri.setKeyColumn('measure_id')
# Create a layer based on the information previously specified (database and column). The layer is
# not yet added to the UI. The layer is a Postgres type
layer = QgsVectorLayer(self.uri.uri(), layer_name, 'postgres')
# Check if the Layer is valid or not (in case of the column/table/... does not exist
if not layer.isValid():
# print("Erreur au chargement de " + layer_name)
return
# Save the layer into the layer list (reminder: the layer list is useful to refresh all layers when
# a notification is received)
# Add the created layer to the QGIS project
QgsMapLayerRegistry.instance().addMapLayer(layer)
self.layers[layer_name] = layer
# refresh the layer
layer.setCacheImage(None)
layer.triggerRepaint()
def loadCsvFiles(self):
# 清除画布上的所有图层
# QgsMapLayerRegistry.instance().removeAllMapLayers()
# 图标样式，圆，大小设为1
# symbol = QgsMarkerSymbolV2.createSimple({'name':'circle', 'size':'1'})
filepath = self.dlg.lineEdit.text()
# 获取文件夹中的所有文件，并过滤不是csv格式的文件
files = os.listdir(filepath)
for file in files:
if not os.path.isdir(file) and os.path.splitext(
file)[1] == '.csv' and not file.startswith('.'):
uri = "file:///" + filepath + "/" + file + "?delimiter=%s&crs=epsg:4326&xField=%s&yField=%s" % (
",", "longitude", "latitude")
vlayer = QgsVectorLayer(uri,
os.path.splitext(file)[0],
"delimitedtext")
vlayer.rendererV2().symbol().setSize(1.3)
if vlayer.isValid():
QgsMapLayerRegistry.instance().addMapLayer(vlayer)
point=QgsPointXY(point_vertex),
neighbors=4,
maxDistance=self.__user_distance)
if len(pipelines_nearest) > 0:
for pipeline_id in pipelines_nearest:
pipeline_geometry = self.__idx_pipelines.geometry(
pipeline_id)
if pipeline_id not in self.__list_visited_pipelines_ids:
self.__q_list_pipelines_ids.append(pipeline_id)
self.__q_list_pipelines.append(pipeline_geometry)
if __name__ == '__main__':
path_to_pipeline_layer = "C:\\Users\\jeferson.machado\\Desktop\\QGIS\\shapes\\rede_agua_tracing.shp"
path_to_valves_layer = "C:\\Users\\jeferson.machado\\Desktop\\QGIS\\shapes\\registro_manobra.shp"
pipelines = QgsVectorLayer(path_to_pipeline_layer, "pipelines_tracing",
"ogr")
valves = QgsVectorLayer(path_to_valves_layer, "valves_tracing", "ogr")
if not pipelines.isValid() or not valves.isValid():
print("Layer failed to load!")
else:
QgsProject.instance().addMapLayer(pipelines)
QgsProject.instance().addMapLayer(valves)
pipe_features = QgsProject.instance().mapLayersByName('pipelines_tracing')
valves_features = QgsProject.instance().mapLayersByName('valves_tracing')
tracing = TracingPipelines(pipe_features, valves_features, debug=True)
tracing.run()