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generic_functions.py
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generic_functions.py
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# -*- coding: utf-8 -*-
from PyQt5.QtCore import QVariant
# from qgis.PyQt.QtCore import QVariant
from qgis import processing
from processing.tools import dataobjects
from qgis.core import QgsCoordinateReferenceSystem, QgsVectorLayer, QgsProject, edit, QgsGeometry, QgsProperty, QgsField, QgsFeature, QgsRasterLayer, QgsSpatialIndex, QgsFeatureRequest, QgsGeometryUtils, QgsVector, QgsCoordinateTransform, QgsMultiPoint, QgsPoint, QgsPointXY, QgsProperty, QgsApplication, Qgis #, QgsRendererCategory, QgsSymbol, QgsLineSymbol, QgsCategorizedSymbolRenderer
# from qgis.core import Qgis
from processing.gui.AlgorithmExecutor import execute_in_place
import os, json #, random
from math import isclose,pi
crs_4326 = QgsCoordinateReferenceSystem("EPSG:4326")
def create_dir_ifnotexists(folderpath):
if not os.path.exists(folderpath):
if not folderpath == '':
os.makedirs(folderpath)
def generate_buffer(inputlayer,distance,segments=5,dissolve=True,cap_style='FLAT',join_style='ROUND',outputlayer='TEMPORARY_OUTPUT'):
'''
interfacing qgis processing operation
one can specify variable length with an QGIS expression like the defalt value in 'distance' parameter
someting like: '( "width" /2)+1.5'
'''
parameter_dict = {'INPUT': inputlayer, 'DISTANCE': distance,'OUTPUT': outputlayer,'DISSOLVE':dissolve,'SEGMENTS':segments}
if type(distance) == str:
parameter_dict['DISTANCE'] = QgsProperty.fromExpression(distance)
cap_styles = {"FLAT":1,"ROUND":0,'SQUARE':2}
if cap_style.upper() in cap_styles:
parameter_dict['END_CAP_STYLE'] = cap_styles[cap_style.upper()]
join_styles = {'ROUND':0,'MITER':1,'BEVEL':2}
if join_style.upper() in join_styles:
parameter_dict['JOIN_STYLE'] = join_styles[join_style.upper()]
return processing.run('native:buffer',parameter_dict)['OUTPUT']
def remove_duplicate_geometries(inputlayer,outputlayer):
parameter_dict = {'INPUT': inputlayer, 'OUTPUT': outputlayer}
return processing.run('native:deleteduplicategeometries',parameter_dict)['OUTPUT']
def remove_duplicate_vertices(inputlayer,tolerance):
parameter_dict = {'INPUT': inputlayer,'TOLERANCE':tolerance,'OUTPUT':'TEMPORARY_OUTPUT'}
return processing.run('native:removeduplicatevertices',parameter_dict)['OUTPUT']
def split_lines_by_max_len(inputlayer,len_val_or_expression,outputlayer='TEMPORARY_OUTPUT'):
parameter_dict = {'INPUT': inputlayer,'LENGTH':len_val_or_expression, 'OUTPUT': outputlayer}
if type(len_val_or_expression) == str:
parameter_dict['LENGTH'] = QgsProperty.fromExpression(len_val_or_expression)
return processing.run('native:splitlinesbylength',parameter_dict)['OUTPUT']
def vec_layers_intersection(inputlayer,overlay_layer,outputlayer='TEMPORARY_OUTPUT'):
parameter_dict = {'INPUT': inputlayer,'OVERLAY':overlay_layer, 'OUTPUT': outputlayer}
return processing.run('qgis:intersection',parameter_dict)['OUTPUT']
def compute_difference_layer(inputlayer,overlaylayer,outputlayer='TEMPORARY_OUTPUT'):
parameter_dict = {'INPUT': inputlayer,'OVERLAY':overlaylayer, 'OUTPUT': outputlayer}
return processing.run('qgis:difference',parameter_dict)['OUTPUT']
# def difference_inplace(inputlayer,overlaylayer):
# # with edit(inputlayer):
# inputlayer.startEditing()
# parameter_dict = {'INPUT': inputlayer,'OVERLAY':overlaylayer}
# registry = QgsApplication.instance().processingRegistry()
# alg = registry.algorithmById("qgis:difference")
# execute_in_place(alg, parameter_dict)
# inputlayer.commitChanges()
def convert_multipart_to_singleparts(inputlayer,outputlayer='TEMPORARY_OUTPUT'):
parameter_dict = {'INPUT': inputlayer, 'OUTPUT': outputlayer}
return processing.run('native:multiparttosingleparts',parameter_dict)['OUTPUT']
def mergelayers(inputlayerlist,dest_crs,outputlayer='TEMPORARY_OUTPUT'):
'''
Will only work for layers of the same geometry type
'''
parameter_dict = {'LAYERS': inputlayerlist,'CRS':dest_crs, 'OUTPUT': outputlayer}
return processing.run('native:mergevectorlayers',parameter_dict)['OUTPUT']
# # # def check_distances_layers(layer_many_features,layer_one_feature,idx=0):
def dissolve_tosinglegeom(inputlayer,outputlayer='TEMPORARY_OUTPUT'):
parameter_dict = {'INPUT': inputlayer, 'OUTPUT': outputlayer}
return processing.run('native:dissolve',parameter_dict)['OUTPUT']
def merge_touching_lines(inputlayer,outputlayer='TEMPORARY_OUTPUT'):
parameter_dict = {'INPUT': inputlayer, 'OUTPUT': outputlayer}
return processing.run('native:mergelines',parameter_dict)['OUTPUT']
def polygonize_lines(inputlines,outputlayer='TEMPORARY_OUTPUT',keepfields=True):
parameter_dict = {'INPUT': inputlines, 'OUTPUT': outputlayer}
return processing.run('native:polygonize',parameter_dict)['OUTPUT']
def convex_hulls(inputlayer,outputlayer='TEMPORARY_OUTPUT',keepfields=True):
parameter_dict = {'INPUT': inputlayer, 'OUTPUT': outputlayer,'KEEP_FIELDS':keepfields}
return processing.run('native:convexhull',parameter_dict)['OUTPUT']
def snap_layers(inputlayer,snap_layer,behavior_code=1,tolerance=0.1,outputlayer='TEMPORARY_OUTPUT',dontcheckinvalid=False):
parameter_dict = {'INPUT': inputlayer, 'OUTPUT': outputlayer,'REFERENCE_LAYER':snap_layer,'TOLERANCE':tolerance,'BEHAVIOR':behavior_code}
if not dontcheckinvalid:
return processing.run('native:snapgeometries',parameter_dict)['OUTPUT']
else:
# thx: https://gis.stackexchange.com/a/307618
context = dataobjects.createContext()
context.setInvalidGeometryCheck(QgsFeatureRequest.GeometryNoCheck)
return processing.run("qgis:snapgeometries", parameter_dict, context=context)['OUTPUT']
def extract_lines_from_polygons(input_polygons,outputlayer='TEMPORARY_OUTPUT'):
parameter_dict = {'INPUT': input_polygons, 'OUTPUT': outputlayer}
return processing.run('native:polygonstolines',parameter_dict)['OUTPUT']
def extract_with_spatial_relation(input_layer,compared_layer,predicate:list=[5],outputlayer='TEMPORARY_OUTPUT',dontcheckinvalid=True):
"""
Generic spatial relationship extractor
Predicates are:
YOU MUST PASS A LIST, you can use more than one predicate
0 — intersect; 1 — contain;2 — disjoint; 3 — equal; 4 — touch; 5 — overlap; 6 — are within; 7 — cross
"""
parameter_dict = {'INPUT': input_layer,'PREDICATE':predicate,'INTERSECT':compared_layer, 'OUTPUT': outputlayer}
if dontcheckinvalid:
# thx: https://gis.stackexchange.com/a/307618
context = dataobjects.createContext()
context.setInvalidGeometryCheck(QgsFeatureRequest.GeometryNoCheck)
return processing.run("qgis:extractbylocation", parameter_dict, context=context)['OUTPUT']
else:
return processing.run('qgis:extractbylocation',parameter_dict)['OUTPUT']
def collected_geoms_layer(inputlayer,outputlayer='TEMPORARY_OUTPUT'):
'''
interface to
https://docs.qgis.org/3.22/en/docs/user_manual/processing_algs/qgis/vectorgeometry.html#qgiscollect
'''
parameter_dict = {'INPUT': inputlayer, 'OUTPUT': outputlayer}
return processing.run('native:collect',parameter_dict)['OUTPUT']
def gen_centroids_layer(inputlayer,outputlayer='TEMPORARY_OUTPUT',for_allparts=False):
parameter_dict = {'INPUT': inputlayer, 'OUTPUT': outputlayer,'ALL_PARTS':for_allparts}
return processing.run('native:centroids',parameter_dict)['OUTPUT']
def gen_voronoi_polygons_layer(inputlayer,outputlayer='TEMPORARY_OUTPUT',buffer_perc=300):
parameter_dict = {'INPUT': inputlayer, 'OUTPUT': outputlayer,'BUFFER':buffer_perc}
return processing.run('qgis:voronoipolygons',parameter_dict)['OUTPUT']
def get_intersections(inputlayer,intersect_layer,outputlayer):
parameter_dict = {'INPUT': inputlayer, 'INTERSECT': intersect_layer, 'OUTPUT': outputlayer}
return processing.run('qgis:lineintersections',parameter_dict)['OUTPUT']
def cliplayer_v2(inputlayer,overlay_lyr,outputlayer='TEMPORARY_OUTPUT'):
"""
the first one was intended for datafiles, not memeory layers
"""
parameter_dict = {'INPUT': inputlayer, 'OVERLAY': overlay_lyr, 'OUTPUT': outputlayer}
return processing.run('qgis:clip',parameter_dict)['OUTPUT']
def reproject_layer(inputlayer,destination_crs='EPSG:4326',output_mode='memory:Reprojected'):
parameter_dict = {'INPUT': inputlayer, 'TARGET_CRS': destination_crs,'OUTPUT': output_mode}
return processing.run('native:reprojectlayer', parameter_dict)['OUTPUT']
def split_lines(inputlayer,splitterlayer,outputlayer='TEMPORARY_OUTPUT'):
parameter_dict = {'INPUT': inputlayer, 'LINES': splitterlayer, 'OUTPUT': outputlayer}
return processing.run('qgis:splitwithlines',parameter_dict)['OUTPUT']
def cliplayer(inlayerpath,cliplayerpath,outputpath):
'''
clip a layer
all inputs are paths!!!
will be generated clipped layer as a file in outputpath
source: https://opensourceoptions.com/blog/pyqgis-clip-vector-layers/ (thx!!)
'''
#run the clip tool
processing.run("native:clip", {'INPUT':inlayerpath,'OVERLAY':cliplayerpath,'OUTPUT':outputpath})
def remove_biggest_polygon(inputlayer,record_area=False,area_fieldname='area'):
areas = []
ids = []
# if one extracts only boundaries, one can still use the area value
if record_area:
create_new_layerfield(inputlayer,area_fieldname)
area_idx = inputlayer.fields().indexOf(area_fieldname)
with edit(inputlayer):
for feature in inputlayer.getFeatures():
area_val = feature.geometry().area()
areas.append(area_val)
ids.append(feature.id())
if record_area:
inputlayer.changeAttributeValue(feature.id(),area_idx,area_val)
max_area_idx = areas.index(max(areas))
inputlayer.deleteFeature(ids[max_area_idx])
def single_geom_polygonize(inputgeom):
return QgsGeometry.polygonize([inputgeom]).asGeometryCollection()[0]
def create_area_field(inputlayer,area_fieldname):
area_idx = create_new_layerfield(inputlayer,area_fieldname)
with edit(inputlayer):
if inputlayer.geometryType() == 2:
for feature in inputlayer.getFeatures():
area_val = feature.geometry().area()
inputlayer.changeAttributeValue(feature.id(),area_idx,area_val)
elif inputlayer.geometryType() == 1:
for feature in inputlayer.getFeatures():
area_val = single_geom_polygonize(feature.geometry()).area()
inputlayer.changeAttributeValue(feature.id(),area_idx,area_val)
# for points or not-spatial will leave all NULL
return area_idx
def create_perimeter_field(inputlayer,perimeter_fieldname):
perimeter_idx = create_new_layerfield(inputlayer,perimeter_fieldname)
with edit(inputlayer):
if inputlayer.geometryType() == 1:
for feature in inputlayer.getFeatures():
perim_val = feature.geometry().length()
inputlayer.changeAttributeValue(feature.id(),perimeter_idx,perim_val)
# TBD for polygons
# elif inputlayer.geometryType() == 2:
# for feature in inputlayer.getFeatures():
# perim_val =
# inputlayer.changeAttributeValue(feature.id(),perimeter_idx,perim_val)
# for points or not-spatial will leave all NULL
return perimeter_idx
def path_from_layer(inputlayer,splitcharacter='|',splitposition=0):
return inputlayer.dataProvider().dataSourceUri().split(splitcharacter)[splitposition]
def custom_local_projection(lgt_0,lat_0=0,mode='TM',return_wkt=False):
as_wkt = f"""PROJCRS["unknown",
BASEGEOGCRS["WGS 84",
DATUM["World Geodetic System 1984",
ELLIPSOID["WGS 84",6378137,298.257223563,
LENGTHUNIT["metre",1]],
ID["EPSG",6326]],
PRIMEM["Greenwich",0,
ANGLEUNIT["degree",0.0174532925199433],
ID["EPSG",8901]]],
CONVERSION["unknown",
METHOD["Transverse Mercator",
ID["EPSG",9807]],
PARAMETER["Latitude of natural origin",{lat_0},
ANGLEUNIT["degree",0.0174532925199433],
ID["EPSG",8801]],
PARAMETER["Longitude of natural origin",{lgt_0},
ANGLEUNIT["degree",0.0174532925199433],
ID["EPSG",8802]],
PARAMETER["Scale factor at natural origin",1,
SCALEUNIT["unity",1],
ID["EPSG",8805]],
PARAMETER["False easting",0,
LENGTHUNIT["metre",1],
ID["EPSG",8806]],
PARAMETER["False northing",0,
LENGTHUNIT["metre",1],
ID["EPSG",8807]]],
CS[Cartesian,2],
AXIS["(E)",east,
ORDER[1],
LENGTHUNIT["metre",1,
ID["EPSG",9001]]],
AXIS["(N)",north,
ORDER[2],
LENGTHUNIT["metre",1,
ID["EPSG",9001]]]]
"""
# TODO: if mode != 'TM' and lat_0 != 0:
# define as_wkt as a stereographic projection
custom_crs = QgsCoordinateReferenceSystem()
custom_crs.createFromWkt(as_wkt)
if return_wkt:
return as_wkt
else:
return custom_crs
def reproject_layer_localTM(inputlayer,outputpath,layername,lgt_0,lat_0=0):
'''
pass None to "outputpath" in order to use an only memory layer
'''
# https://docs.qgis.org/3.16/en/docs/user_manual/processing_algs/qgis/vectorgeneral.html#reproject-layer
operation = f'+proj=pipeline +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=tmerc +lat_0={lat_0} +lon_0={lgt_0} +k=1 +x_0=0 +y_0=0 +ellps=WGS84'
parameter_dict = { 'INPUT' : inputlayer, 'OPERATION' : operation, 'OUTPUT' : outputpath }
if not outputpath:
if layername:
parameter_dict['OUTPUT'] = f'memory:{layername}'
else:
parameter_dict['OUTPUT'] = 'TEMPORARY_OUTPUT'
# option 1: creating from wkt
# proj_wkt = custom_local_projection(lgt_0,return_wkt=True)
# parameter_dict['TARGET_CRS'] = QgsCoordinateReferenceSystem(proj_wkt)
# option 2: as a crs object, directly
new_crs = custom_local_projection(lgt_0,lat_0=lat_0)
parameter_dict['TARGET_CRS'] = new_crs
if not outputpath:
ret_lyr = processing.run('native:reprojectlayer', parameter_dict)['OUTPUT']
else:
processing.run('native:reprojectlayer', parameter_dict)
ret_lyr = QgsVectorLayer(outputpath,layername,'ogr')
# fixing no set layer crs:
ret_lyr.setCrs(new_crs)
return ret_lyr, new_crs
# def retrieve_att(layer,att_id,row_id):
# iterr = layer.getFeatures()
# attrs = []
# for feature in iterr:
# attrs.append(feature.attributes())
# return attrs[row_id][att_id]
# def retrieve_attrs(layer):
# iterr = layer.getFeatures()
# attrs = []
# for feature in iterr:
# attrs.append(feature.attributes())
# return attrs
# def column(matrixList, i):
# return [row[i] for row in matrixList]
def get_first_feature_or_geom(inputlayer,return_geom=False):
first_feature = QgsFeature()
# filling first feature:
inputlayer.getFeatures().nextFeature(first_feature)
if return_geom:
return first_feature.geometry()
else:
return first_feature
def check_empty_layer(inputlayer):
feat_count = 0
for feature in inputlayer.getFeatures():
feat_count += 1
if feat_count > 1:
break
return (feat_count == 0)
def get_column_names(inputlayer):
return inputlayer.fields().names()
def create_new_layerfield(inputlayer,fieldname,datatype=QVariant.Double):
'''
create a new field for the layer, and also return the index of the new field
'''
with edit(inputlayer):
new_field = QgsField(fieldname,datatype)
inputlayer.dataProvider().addAttributes([new_field])
inputlayer.updateFields()
return inputlayer.fields().indexOf(fieldname)
def create_filled_newlayerfield(inputlayer,fieldname,fieldvalue,datatype):
# creating field
field_index = create_new_layerfield(inputlayer,fieldname,datatype)
# then filling:
with edit(inputlayer):
if isinstance(fieldvalue,dict):
dkey = next(iter(fieldvalue))
# print(dkey,fieldvalue[dkey])
# by now only length is implemented
if dkey == 'geometry':
if fieldvalue[dkey] == "length":
for feature in inputlayer.getFeatures():
inputlayer.changeAttributeValue(feature.id(),field_index,feature.geometry().length())
if dkey == 'attr_by_id':
inner_dict = fieldvalue[dkey]
for feature in inputlayer.getFeatures():
if feature.id() in inner_dict:
inputlayer.changeAttributeValue(feature.id(),field_index,inner_dict[feature.id()])
else:
for feature in inputlayer.getFeatures():
inputlayer.changeAttributeValue(feature.id(),field_index,fieldvalue)
def create_fill_id_field(inputlayer,fieldname = 'id_on_layer'):
created_field_index = create_new_layerfield(inputlayer,fieldname,QVariant.Int)
with edit(inputlayer):
for feature in inputlayer.getFeatures():
inputlayer.changeAttributeValue(feature.id(),created_field_index,feature.id())
def remove_layerfields(inputlayer,fieldlist):
# to assert if the field name really exists in 'fieldlist'
layer_fields = get_column_names(inputlayer)
with edit(inputlayer):
for field_name in fieldlist:
if field_name in layer_fields:
f_idx = inputlayer.fields().indexOf(field_name)
inputlayer.deleteAttribute(f_idx)
def remove_all_layerfields(inputlayer):
remove_layerfields(inputlayer,get_column_names(inputlayer))
def get_layercolumn_byname(inputlayer,columname):
input_table = get_layer_att_table(inputlayer)
column_id = inputlayer.fields().lookupField(columname)
return [sublist[column_id] for sublist in input_table]
def get_layer_att_table(inputlayer):
att_lists = []
for feature in inputlayer.getFeatures():
att_lists.append(feature.attributes())
return att_lists
def wipe_folder_files(inputfolderpath):
for filename in os.listdir(inputfolderpath):
filepath = os.path.join(inputfolderpath,filename)
os.remove(filepath)
# def remove_layer(layername):
# # thx https://gis.stackexchange.com/a/310590/49900
# # but deprecated
# layerinstance = QgsProject.instance()
# lyref = layerinstance.mapLayersByName(layername)
# if lyref:
# layerinstance.removeMapLayer(lyref[0].id())
def remove_layerlist(listoflayer_alias):
# thx https://gis.stackexchange.com/a/310590/49900
project_instance = QgsProject.instance()
for layerfullname in project_instance.mapLayers():
if any(alias in layerfullname for alias in listoflayer_alias):
project_instance.removeMapLayer(layerfullname)
### DEPRECATED ###
# # def remove_unconnected_lines(inputlayer):
# # #thx: https://gis.stackexchange.com/a/316058/49900
# # with edit(inputlayer):
# # for i,feature_A in enumerate(inputlayer.getFeatures()):
# # is_disjointed = True
# # # disjointed_features = 0
# # for j,feature_B in enumerate(inputlayer.getFeatures()):
# # if not i == j:
# # if not feature_A.geometry().disjoint(feature_B.geometry()):
# # # print('not disjointed!!',i,j)
# # is_disjointed=False
# # if is_disjointed:
# # # print(is_disjointed)
# # inputlayer.deleteFeature(feature_A.id())
# # # # # # it works inplace =D ()
# # # # # # return inputlayer
def qgs_point_geom_from_line_at(inputlinefeature,index=0):
return QgsGeometry.fromPointXY(inputlinefeature.geometry().asPolyline()[index])
def remove_lines_from_no_block(inputlayer,layer_to_check_culdesac=None):
'''
remove lines in wich one of its ends
are not connected to any other segment
the "layer_to_check_culdesac" is a whole layer (dissolved) that should be checked for 'within' condition
'''
# TODO: check if will work with multilinestrings
check_for_culdesacs = False
if layer_to_check_culdesac:
check_for_culdesacs = True
checker_geom = get_first_feature_or_geom(layer_to_check_culdesac,True)
feature_ids_to_be_removed = []
index = QgsSpatialIndex(inputlayer.getFeatures())
for i,feature_A in enumerate(inputlayer.getFeatures()):
P0 = qgs_point_geom_from_line_at(feature_A) # first point
PF = qgs_point_geom_from_line_at(feature_A,-1) # last point
P0_count = 0
PF_count = 0
# THE OPTIMIZATION PATROL:
# for j,feature_B in enumerate(inputlayer.getFeatures()):
# # if not i == j:
# if P0.intersects(feature_B.geometry()):
# P0_count += 1
# if PF.intersects(feature_B.geometry()):
# PF_count += 1
intersect_ids = index.intersects(feature_A.geometry().boundingBox())
for id in intersect_ids:
if id != feature_A.id():
if P0.intersects(inputlayer.getFeature(id).geometry()):
P0_count += 1
if PF.intersects(inputlayer.getFeature(id).geometry()):
PF_count += 1
# print(P0_count,PF_count)
if any(count == 0 for count in [P0_count,PF_count]):
# after checking, only add if its not a "culdesac"
if check_for_culdesacs:
if not feature_A.geometry().within(checker_geom):
feature_ids_to_be_removed.append(feature_A.id())
# if no "checker geometry", then just add directly
else:
feature_ids_to_be_removed.append(feature_A.id())
with edit(inputlayer):
for feature_id in feature_ids_to_be_removed:
inputlayer.deleteFeature(feature_id)
def remove_features_byattr(inputlayer,attrname,attrvalue):
column_values = get_layercolumn_byname(inputlayer,attrname)
with edit(inputlayer):
for i,feature in enumerate(inputlayer.getFeatures()):
if column_values[i] == attrvalue:
inputlayer.deleteFeature(feature.id())
def add_tms_layer(qms_string,layername):
# mostly for user add basemaps buttons
QgsProject.instance().addMapLayer(QgsRasterLayer(qms_string,layername, 'wms'))
def distance_geom_another_layer(inputgeom,inputlayer,as_list=False,to_sort=False,input_spatial_index=None,max_dist=100,nn_feat_num=5):
ret_dict = {}
'''
one passes a geometry and a layer anf get dict/list of distances
'''
feat_request = QgsFeatureRequest()
if input_spatial_index:
# thx, pt 2 https://gis.stackexchange.com/a/59185/49900
nearest_ids = input_spatial_index.nearestNeighbor(inputgeom,nn_feat_num,max_dist)
feat_request.setFilterFids(nearest_ids)
for feature in inputlayer.getFeatures(feat_request):
ret_dict[feature.id()] = inputgeom.distance(feature.geometry())
if as_list:
if to_sort:
return sorted(list(ret_dict.values()))
else:
return list(ret_dict.values())
else:
return ret_dict
def gen_layer_spatial_index(inputlayer,use_fullgeom_flag=True):
'''
return a spatial index filled with all of the layer's features
'''
# thx: https://gis.stackexchange.com/a/59185/49900 (part 1)
feat_iterator = inputlayer.dataProvider().getFeatures()
if use_fullgeom_flag:
# thx: https://gis.stackexchange.com/a/374282/49900
ret_spatial_index = QgsSpatialIndex(feat_iterator,flags=QgsSpatialIndex.FlagStoreFeatureGeometries)
else:
ret_spatial_index = QgsSpatialIndex(feat_iterator)
# temp_feat = QgsFeature() # just to store temporarily
# # filling:
# while feat_iterator.nextFeature(temp_feat): # so ellegant
# ret_spatial_index.insertFeature(temp_feat)
return ret_spatial_index
# def distances_anotherlyr_unsingNN(inputPTgeom,inputspatialindex,inputlayer,max_dist=100,nn_feat_num=5):
def get_major_dif_signed(inputval,inputdict,tol=0.5,print_diffs=False):
'''
in spite of finding a simple way to obtain the 'orthogonal' distance and ID of the orthonogal feature
'''
diffs = {} # []
inputval = float(inputval)
for key in inputdict:
# always avoid to compare floats equally
desired_value = float(inputdict[key])
if not isclose(inputval,desired_value,abs_tol=tol):
diffs[key] = desired_value-inputval #.append(inputdict[key]-inputval)
else:
refused_key = key
if print_diffs:
print(diffs)
if diffs:
if len(diffs) > 1:
key_maxdif = max(diffs,key=diffs.get)
return inputval+diffs[key_maxdif],key_maxdif
else:
# dict with only one key:
only_key = next(iter(diffs)) # thx: https://stackoverflow.com/a/46042617/4436950
return inputval+diffs[only_key],only_key
else:
return inputval,refused_key
def geom_to_feature(inputgeom,attrs_list=None):
# remember that inplace methods generally have a return that isn't the object itself #lessons
ret_feat = QgsFeature()
ret_feat.setGeometry(inputgeom)
if attrs_list:
ret_feat.setAttributes(attrs_list)
return ret_feat
def layer_from_featlist(featlist,layername=None,geomtype="Point",attrs_dict=None,output_type = 'memory',CRS=None):
'''
creating a layer from a list of features (not geometries)
geomtype must be one of:
[“point”, “linestring”, “polygon”, “multipoint”,”multilinestring”,”multipolygon”]
'''
lname = 'temp'
if layername:
lname = layername
ret_layer = QgsVectorLayer(geomtype, lname, output_type)
with edit(ret_layer):
if attrs_dict:
attrs_list = []
for key in attrs_dict:
attrs_list.append(QgsField(key,attrs_dict[key]))
ret_layer.dataProvider().addAttributes(attrs_list)
ret_layer.updateFields()
for feature in featlist:
ret_layer.dataProvider().addFeature(feature)
ret_layer.updateExtents()
if CRS:
ret_layer.setCrs(CRS)
return ret_layer
def items_minor_than_inlist(value,inpulist):
# thx: https://stackoverflow.com/a/10543316/4436950
return sum(entry < value for entry in inpulist)
def keep_only_contained_within(inputlayer,geomlayer):
geomtocheck = get_first_feature_or_geom(geomlayer,True)
with edit(inputlayer):
for feature in inputlayer.getFeatures():
if not feature.geometry().within(geomtocheck):
inputlayer.deleteFeature(feature.id())
def feature_from_fid(inputlayer,fid):
"""
could be a little less burocratic, but...
"""
# thx: https://gis.stackexchange.com/a/59185/49900
feat_iterator = inputlayer.getFeatures(QgsFeatureRequest().setFilterFid(fid))
ret_feat = QgsFeature()
feat_iterator.nextFeature(ret_feat)
return ret_feat
def points_intersecting_buffer_boundary(input_point,inputlayer,featlist=None,buffersize=1,segments=5):
'''
inputlayer must have geometries of Line type
'''
boundary = input_point.buffer(buffersize,segments).convertToType(Qgis.GeometryType(1)) # 1 is the value for "LineGeometry" in https://api.qgis.org/api/classQgis.html#a84964253bb44012b246c20790799c04d
# list storing the points that shall be returned:
ret_list = []
feat_request = QgsFeatureRequest()
if featlist:
feat_request.setFilterFids(featlist)
for feature in inputlayer.getFeatures(feat_request):
# ret_list.append(boundary.intersection(feature.geometry()))
ret_list.append(feature.geometry().intersection(boundary))
return ret_list
def qgsgeom_to_pointuple(inputgeom):
# TODO (if needed): consider Z or M
p = inputgeom.asPoint()
return p.x(),p.y()
def point_forms_minor_angle_w2(fixedpoint_A,centerpoint_B,pointlist,return_index=False,max_instead=False,print_angles=False):
'''
that is: the point that will forms the minor angle, compared to other angles spawn by the other points.
All angles are formed in conjunction with fixed points A and B
'''
if len(pointlist) == 0:
if return_index:
return 0
else:
return(pointlist[0])
else:
anglelist = []
pA = qgsgeom_to_pointuple(fixedpoint_A)
pB = qgsgeom_to_pointuple(centerpoint_B)
for point in pointlist:
try:
pC = qgsgeom_to_pointuple(point)
angle = QgsGeometryUtils.angleBetweenThreePoints(*pA,*pB,*pC) * (180/pi)
if angle > 180:
angle = 360 - angle
anglelist.append(angle)
except:
anglelist.append(360)
if print_angles:
print(anglelist)
if anglelist:
index = anglelist.index(min(anglelist))
else:
index = 0
if return_index:
return index
else:
return pointlist[index]
def vector_from_2_pts(point_A,point_B,desiredLen = None,normalized=False):
pA = qgsgeom_to_pointuple(point_A)
pB = qgsgeom_to_pointuple(point_B)
dx = pB[0] - pA[0]
dy = pB[1] - pA[1]
ret_vec = QgsVector(dx,dy)
if desiredLen:
return ret_vec.normalized() * desiredLen
else:
if normalized:
return ret_vec.normalized()
else:
return ret_vec
def check_sidewalk_intersection(intersectiongeom,referencepoint):
if not intersectiongeom.isEmpty():
if not intersectiongeom.isMultipart():
return True,intersectiongeom
else:
# if it returns Multipart geometry, it was because there are 2 points of intersection, so we chose the nearest to "referencepoint"
# print(intersectiongeom.asWkt())
# print(intersectiongeom.wkbType())
as_geomcollection = intersectiongeom.asGeometryCollection()
# print([item.type() for item in as_geomcollection])
if intersectiongeom.wkbType() == 4:
distances = [referencepoint.distance(point.asPoint()) for point in as_geomcollection]
return True,as_geomcollection[distances.index(min(distances))]
elif intersectiongeom.wkbType() == 5:
points = []
for line in as_geomcollection:
for point in line.asPolyline():
points.append(point)
distances = [referencepoint.distance(point) for point in points]
# print(points,'\n')
# print(distances,'\n')
return True,pointXY_to_geometry(points[distances.index(min(distances))])
elif intersectiongeom.wkbType() == 7:
points = []