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worker_class.py
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worker_class.py
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# -*- coding: utf-8 -*-
"""
/***************************************************************************
Lines Ranking
A QGIS plugin
-------------------
begin : 2020-07-07
copyright : (C) 2020 by Julia Borisova, Mikhail Sarafanov
email : yulashka.htm@yandex.ru, mik_sar@mail.ru
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
"""
from qgis.gui import *
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *
import time
import os, string
from qgis.core import *
from .preparation import *
from .graph_processing import overall_call
import processing
TMP_DIRECTORY_NAME = 'lines_ranking_tmp_directory'
class StartScript(QgsTask):
def __init__(self, desc, flags, selectedLayer, pt, cleanTresholdValue,
outLineEdit, QgsProject, fields_names):
QgsTask.__init__(self, desc, flags)
self.selectedLayer = selectedLayer
self.pt = pt
self.cleanTresholdValue = cleanTresholdValue
self.outLineEdit = outLineEdit
self.QgsProject = QgsProject
self.result = None
self.logText = ''
self.fields_names = fields_names
self.error_reason = ''
self.base_dir = os.path.abspath('.')
if 'C:' in self.base_dir:
# Generate temporary folder not in C disk
available_drives = ['%s:' % d for d in string.ascii_uppercase if
os.path.exists('%s:' % d)]
if len(available_drives) >= 2:
# There is an alternative:
available_drives = list(filter(lambda x: 'C' not in x, available_drives))
self.base_dir = os.path.join(available_drives[0], TMP_DIRECTORY_NAME)
self.create_base_directory_if_required()
self.attributes_file_path = os.path.join(self.base_dir, 'attributes_temp.csv')
self.points_file_path = os.path.join(self.base_dir, 'points_temp.csv')
self.original_file_path = os.path.join(self.base_dir, 'original_temp.csv')
# Set temporary files with intermediate results
# (needed in the case if input layer not in shp format)
self.tmp_after_fixing_geometries = os.path.join(self.base_dir,
'tmp_lines_ranking_after_fixing_geometries.gpkg')
self.tmp_after_vclean = os.path.join(self.base_dir, 'tmp_lines_ranking_after_vclean.gpkg')
self.remove_tmp_files()
def create_base_directory_if_required(self):
if os.path.exists(self.base_dir) is False:
os.mkdir(self.base_dir)
def remove_base_directory(self):
if len(os.listdir(self.base_dir)) < 1 and TMP_DIRECTORY_NAME in self.base_dir:
# Remove directory after finishing
os.rmdir(self.base_dir)
def remove_tmp_files(self):
if os.path.exists(self.tmp_after_fixing_geometries) is True:
os.remove(self.tmp_after_fixing_geometries)
if os.path.exists(self.tmp_after_vclean) is True:
os.remove(self.tmp_after_vclean)
def run(self):
try:
# By default - use intermediate layers
answer = self._run_ranking(use_intermediate_layers=True)
self.remove_tmp_files()
self.remove_base_directory()
return answer
except Exception as ex:
self.logText = 'Errors occurred. Re-run algorithm without saving intermediate layers'
try:
self.remove_tmp_files()
self.remove_base_directory()
except Exception as ex:
pass
answer = self._run_ranking(use_intermediate_layers=False)
return answer
def _fix_geometries_and_v_clean_with_temporary_files(self):
self.logText = 'Fixing geometries'
if os.path.exists(self.tmp_after_fixing_geometries) is True:
os.remove(self.tmp_after_fixing_geometries)
vl = fix_geometries(self.selectedLayer,
self.tmp_after_fixing_geometries)
if self.isCanceled():
return None, None
else:
if self.cleanTresholdValue.replace(' ', '') != '':
self.setProgress(5)
self.logText = 'Filling gaps (v.clean)'
try:
cleaned_layer_path = clean_gaps(vl, self.cleanTresholdValue,
self.tmp_after_vclean)
cleaned_layer = QgsVectorLayer(cleaned_layer_path,
'v_clean')
except Exception:
self.error_reason = 'grass'
self.logText = ''
return None, None
else:
vl = QgsVectorLayer(vl, 'fix')
pr = vl.dataProvider()
pr.addAttributes([QgsField("fid", QVariant.Int)])
vl.updateFields()
cleaned_layer = vl
buffer_layer = createCleanedBuffer(cleaned_layer)
buffer_layer.setProviderEncoding(u'UTF-8')
buffer_layer.dataProvider().setEncoding(u'UTF-8')
return cleaned_layer, buffer_layer
def _fix_geometries_and_v_clean_in_memory(self):
self.logText = 'Fixing geometries. Re-run'
vl = fix_geometries(self.selectedLayer, 'memory:fixed_geometry')
if self.isCanceled():
return None, None
else:
if self.cleanTresholdValue.replace(' ', '') != '':
self.setProgress(5)
self.logText = 'Filling gaps (v.clean). Re-run'
try:
cleaned_payer_path = clean_gaps(vl, self.cleanTresholdValue, 'TEMPORARY_OUTPUT')
cleaned_layer = QgsVectorLayer(cleaned_payer_path, 'v_clean')
except Exception:
self.error_reason = 'grass'
self.logText = ''
return None, None
else:
pr = vl.dataProvider()
pr.addAttributes([QgsField("fid", QVariant.Int)])
vl.updateFields()
cleaned_layer = vl
buffer_layer = createCleanedBuffer(cleaned_layer)
buffer_layer.setProviderEncoding(u'UTF-8')
buffer_layer.dataProvider().setEncoding(u'UTF-8')
return cleaned_layer, buffer_layer
def _run_ranking(self, use_intermediate_layers: bool = False):
self.create_base_directory_if_required()
response = False
cleaned_layer = None
try:
if use_intermediate_layers is True:
cleaned_layer, buffer_layer = self._fix_geometries_and_v_clean_with_temporary_files()
else:
# All layers will be processed in memory
cleaned_layer, buffer_layer = self._fix_geometries_and_v_clean_in_memory()
if cleaned_layer is None:
return False
if self.isCanceled():
return False
else:
self.setProgress(15)
self.logText = 'Clear attribute fields'
cleaned_layer.startEditing()
count = 0
del_list = []
for field in cleaned_layer.dataProvider().fields():
if field.name() != 'fid':
del_list.append(count)
count += 1
cleaned_layer.dataProvider().deleteAttributes(del_list)
cleaned_layer.updateFields()
cleaned_layer.commitChanges()
if self.isCanceled():
return False
else:
self.setProgress(20)
self.logText = 'Create lines segments'
clip_output = clip_line_to_segment(cleaned_layer)
clipped_vector_layer = clip_output[0]
if self.isCanceled():
return False
else:
options = QgsVectorFileWriter.SaveVectorOptions()
options.driverName = "CSV"
options.fileEncoding = "utf-8"
QgsVectorFileWriter.writeAsVectorFormatV2(clip_output[1], self.attributes_file_path,
QgsCoordinateTransformContext(),
options)
if self.isCanceled():
return False
else:
clipped_vector_layer.startEditing()
self.setProgress(25)
self.logText = 'Creating "fid" attributes'
all_f = clipped_vector_layer.featureCount()
for feature in clipped_vector_layer.getFeatures():
progress = 25 + (int(feature.id())*10) / all_f
self.setProgress(progress)
if self.isCanceled():
break
else:
if feature.geometry().wkbType() == 0:
clipped_vector_layer.deleteFeature(feature.id())
else:
feature['fid'] = feature.id()
clipped_vector_layer.updateFeature(feature)
clipped_vector_layer.commitChanges()
self.setProgress(36)
self.logText = 'Calculating lines intersections'
if self.isCanceled():
return False
else:
options = QgsVectorFileWriter.SaveVectorOptions()
options.driverName = "CSV"
options.fileEncoding = "utf-8"
QgsVectorFileWriter.writeAsVectorFormatV2(clipped_vector_layer,
self.original_file_path,
QgsCoordinateTransformContext(),
options)
if self.isCanceled():
return False
else:
intersect_point_layer = get_lines_intersections(clipped_vector_layer,
self.setProgress)
if self.isCanceled():
return False
else:
options = QgsVectorFileWriter.SaveVectorOptions()
options.driverName = "CSV"
options.fileEncoding = "utf-8"
QgsVectorFileWriter.writeAsVectorFormatV2(intersect_point_layer,
self.points_file_path,
QgsCoordinateTransformContext(),
options)
if self.isCanceled():
return False
else:
self.setProgress(47)
self.logText = 'Get nearest segment id'
start_segment_id = get_nearest_segmentId(clipped_vector_layer,
self.pt, self.setProgress)
if self.isCanceled():
return False
else:
self.setProgress(58)
self.logText = 'Graph traversal ranking'
out_dataset = overall_call(self.original_file_path,
self.points_file_path,
start_segment_id,
self.attributes_file_path,
self.setProgress)
os.remove(self.points_file_path)
os.remove(self.original_file_path)
os.remove(self.attributes_file_path)
clipped_vector_layer.selectAll()
outLayer = processing.run("native:saveselectedfeatures",
{'INPUT': clipped_vector_layer, 'OUTPUT': 'memory:rank_output'})['OUTPUT']
if self.isCanceled():
return False
else:
self.setProgress(89)
self.logText = 'Creating attributes table'
pr = outLayer.dataProvider()
for field_name in self.fields_names:
pr.addAttributes([QgsField(field_name, QVariant.Int)])
outLayer.updateFields()
outLayer.startEditing()
all_f = outLayer.featureCount()
for feature in outLayer.getFeatures():
progress = 89 + (int(feature.id())*10)/all_f
self.setProgress(progress)
try:
if self.isCanceled():
break
else:
f_id = feature['fid']
rank = out_dataset[f_id][0]
value_shreve = out_dataset[f_id][1]
value_strahler = out_dataset[f_id][2]
distance = out_dataset[f_id][3]
try:
feature[self.fields_names[0]] = rank
except Exception:
pass
try:
feature[self.fields_names[1]] = value_shreve
except Exception:
pass
try:
feature[self.fields_names[2]] = value_strahler
except Exception:
pass
try:
feature[self.fields_names[3]] = distance
except Exception:
pass
outLayer.updateFeature(feature)
except Exception as e:
outLayer.deleteFeature(feature.id())
outLayer.commitChanges()
createSpatialIndex(outLayer)
outLayerWithAttr = joinAttributes(outLayer, buffer_layer, self.fields_names)
outLayerWithAttr.setProviderEncoding(u'UTF-8')
outLayerWithAttr.dataProvider().setEncoding(u'UTF-8')
if self.isCanceled():
return False
else:
if self.outLineEdit.replace(' ', '') != '':
if self.outLineEdit[-5:] != '.gpkg':
self.outLineEdit = self.outLineEdit + '.gpkg'
try:
QgsVectorFileWriter.writeAsVectorFormat(layer=outLayerWithAttr,
fileName=self.outLineEdit,
fileEncoding="utf-8",
driverName="GPKG")
self.result = QgsVectorLayer(self.outLineEdit, self.outLineEdit.split('/')[-1][:-5], "ogr")
except Exception as e:
pass
else:
self.result = outLayerWithAttr
if self.isCanceled():
if use_intermediate_layers is True:
del cleaned_layer
self.remove_tmp_files()
self.remove_base_directory()
return False
else:
if use_intermediate_layers is False:
del cleaned_layer
self.remove_tmp_files()
self.remove_base_directory()
return True
except Exception as ex:
del cleaned_layer
self.remove_tmp_files()
self.remove_base_directory()
raise ex
def cancel(self):
super().cancel()
def finished(self, result):
self.setProgress(0)
self.logText = ''
if result is False:
try:
os.remove(self.points_file_path)
os.remove(self.original_file_path)
os.remove(self.attributes_file_path)
except Exception:
pass
if self.error_reason == 'grass':
QMessageBox.critical(None, "Error", 'GRASS modules are not available. Activate GRASS or leave snapping threshold empty')
if result is True:
QMessageBox.information(None, "Success", 'Lines Ranking process is finished')
class Worker(QObject):
def __init__(self, qapp, selectedLayer, pt, cleanTresholdValue, outLineEdit, QgsProject, prBar, logTxtLine, fields_names):
self.qapp = qapp
self.selectedLayer = selectedLayer
self.pt = pt
self.cleanTresholdValue = cleanTresholdValue
self.outLineEdit = outLineEdit
self.QgsProject = QgsProject
self.result = None
self.progress = prBar
self.logTxtLine = logTxtLine
self.fields_names = fields_names
def setResult(self, r):
QgsProject.instance().addMapLayer(r)
self.progress = 0
def progressSet(self, progress, logText):
self.logTxtLine.setText(logText)
if isinstance(progress, float):
# Current value must be integer
progress = int(round(progress))
self.progress.setValue(progress)
def StartScriptTask(self):
self.task = StartScript('Lines Ranking processing', QgsTask.CanCancel,
self.selectedLayer, self.pt, self.cleanTresholdValue,
self.outLineEdit, self.QgsProject, self.fields_names)
self.task.progressChanged.connect(lambda: self.progressSet(self.task.progress(), self.task.logText))
self.task.taskCompleted.connect(lambda: self.setResult(self.task.result))
self.qapp.taskManager().addTask(self.task)
def cancelTask(self):
self.task.cancel()
QMessageBox.critical(None, "Terminating", 'Lines Ranking process was canceled')