def get_linked_esu_list(self, usrn):
"""
function that selects all esus for a determined street
:param usrn: the unique identifier of a certain street
:return: list[esu_ids] all esu ids linked to a certain street or
void in case a street does not have any linked esu
"""
# executing the query
esus_query_model = QSqlQueryModel()
esus_query_model.setQuery(self.queries[9].format(usrn))
while esus_query_model.canFetchMore():
esus_query_model.fetchMore()
n_rows = esus_query_model.rowCount()
# skip if no esus are linked
if n_rows == 0:
return
else:
i = 0
esus_list = []
# creating a list of ESUs Ids that are linked to the street
while i <= n_rows - 1:
model_index = esus_query_model.createIndex(i, 0)
esu = model_index.data()
esus_list.append(esu)
i += 1
return esus_list
def check_start_end(self, tol):
# set the feature counter to 0
count = 0
# initialises two virtual objects points (start and end point)
start_point = self.start_point
end_point = self.end_point
# uses the qgis python api to access the ESU Graphic Layer
esu_layer = self.esu_layer
# runs the query number 8 to retrieve all streets from the Database
streets_model = QSqlQueryModel()
streets_model.setQuery(self.queries[8])
while streets_model.canFetchMore():
streets_model.fetchMore()
n_columns = streets_model.columnCount()
n_rows = streets_model.rowCount()
i = 0
j = 0
# first loop start (for each street):
start_end_content = []
while i <= n_rows - 1:
self.progress_win.setLabelText("Checking start-end Coordinates...")
# initialises the state of the checks booleans both to false
start_ok = False
end_ok = False
col_info = []
while j <= n_columns - 1:
model_index = streets_model.createIndex(i, j)
if j == 0:
data = model_index.data()
col_info.append(data)
if j == 1:
data = model_index.data()
col_info.append(data)
if j == 2:
data = model_index.data()
col_info.append(data)
if j >= 3:
data = model_index.data()
col_info.append(data)
j += 1
usrn = col_info[0]
ref_type = col_info[2]
desc = col_info[1]
start_point.set(float(col_info[3]), float(col_info[4]))
end_point.set(float(col_info[5]), float(col_info[6]))
# filter the layer "ESU Graphic" for the ESUs Ids returned from the list
# deal just with the arcs part of multi arcs street
esus_list = self.get_linked_esu_list(usrn)
feat_filter = self.build_layer_filter(esus_list)
feat_request = QgsFeatureRequest()
feat_request.setFilterExpression(feat_filter)
# second loop starts (for each arc (ESU) composing the street)
# iterate through all filtered features and their proximity with the start and end of the street
features = self.esu_layer.getFeatures(feat_request)
features.rewind()
# iterates through features
for feat in features:
# check start end points for each of the only if none of the start end points of
# a ESU on each street is not already matched
if (start_ok is not True) or (end_ok is not True):
result = self.start_end_proximity(start_point, end_point,
feat, tol)
# both dist are ok
if result == 3:
start_ok = True
end_ok = True
# just end dist is ok
elif result == 2:
end_ok = True
# just start dist is ok
elif result == 1:
start_ok = True
else:
break
# in case of problems
if not start_ok or not end_ok:
count += 1
start_end_item = [str(col_info[0]) + ","]
# handles the creation of the report on a text file
if not start_ok and not end_ok:
start_end_item.append("(both),")
if not start_ok and end_ok:
start_end_item.append("(start),")
if start_ok and not end_ok:
start_end_item.append("(end),")
start_end_item.append(str(ref_type) + ",")
start_end_item.append(str(desc) + "\n")
start_end_content.append(start_end_item)
j = 0
i += 1
if count == 0:
self.progress_win.setValue(7)
return
else:
start_end_content.insert(0, self.column_names[5])
self.progress_win.setValue(7)
return self.content_to_screen(content_list=start_end_content,
query_model=None,
columns_name_id=None,
no_content_id=8)
