"""

This is an example algorithm that takes a vector layer and

creates a new identical one.

It is meant to be used as an example of how to create your own

algorithms and explain methods and variables used to do it. An

algorithm like this will be available in all elements, and there

is not need for additional work.

All Processing algorithms should extend the QgsProcessingAlgorithm

class.

"""

# Constants used to refer to parameters and outputs. They will be

# used when calling the algorithm from another algorithm, or when

# calling from the QGIS console.

RESEAU = 'RESEAU'

IDENT='IDENT'

SENS = 'SENS'

NOEUDS = 'NOEUDS'

PREFIXE='PREFIXE'

def initAlgorithm(self, config):

"""

Here we define the inputs and output of the algorithm, along

with some other properties.

"""

self.addParameter(

QgsProcessingParameterVectorLayer(

self.RESEAU,

self.tr('Network'),

[QgsProcessing.TypeVectorLine]

)

)

self.addParameter(

QgsProcessingParameterField(

self.SENS,

self.tr('Direction'),

parentLayerParameterName=self.RESEAU,

type=QgsProcessingParameterField.String,

optional=True

)

)

self.addParameter(

QgsProcessingParameterEnum(

self.IDENT,

self.tr('Node Id'),

[self.tr('Number series'),self.tr('Geographic string(unique)')],

defaultValue=0,

)

)

self.addParameter(

QgsProcessingParameterString(

self.PREFIXE,

self.tr('Prefix'),

'',

optional=True

)

)

self.addParameter(

QgsProcessingParameterFeatureSink(

self.NOEUDS,

self.tr('Nodes layer'),

QgsProcessing.TypeVectorPoint

)

)

# We add a feature sink in which to store our processed features (this

# usually takes the form of a newly created vector layer when the

# algorithm is run in QGIS).

def processAlgorithm(self, parameters, context, feedback):

"""

Here is where the processing itself takes place.

"""

# Retrieve the feature source and sink. The 'dest_id' variable is used

# to uniquely identify the feature sink, and must be included in the

# dictionary returned by the processAlgorithm function.

reseau = self.parameterAsVectorLayer(parameters, self.RESEAU, context)

sens=self.parameterAsFields(parameters,self.SENS,context)

ident=self.parameterAsFields(parameters,self.IDENT,context)

prefixe = self.parameterAsString(parameters, self.PREFIXE, context)

if len(sens)>0:

sens=sens[0]

##CEREMA=group

##reseau=vector line

##prefixe=optional string

##sens= field reseau

##fichier_noeuds=output vector

layer=reseau

nom_champs=[]

for i in layer.fields():

nom_champs.append(i.name())

if ("i" not in nom_champs):

layer.dataProvider().addAttributes([QgsField("i",QVariant.String,len=15)])

if ("j" not in nom_champs):

layer.dataProvider().addAttributes([QgsField("j",QVariant.String,len=15)])

if ("ij" not in nom_champs):

layer.dataProvider().addAttributes([QgsField("ij",QVariant.String,len=31)])

layer.updateFields()

layer.commitChanges()

ida=layer.fields().indexFromName("i")

idb=layer.fields().indexFromName("j")

idij=layer.fields().indexFromName("ij")

lines=layer.getFeatures()

noeuds={}

#nom_fichier=fichier_noeuds

champs=QgsFields()

champs.append(QgsField("num",QVariant.String,len=35))

champs.append(QgsField("nb",QVariant.Int))

(table_noeuds,dest_id) = self.parameterAsSink(parameters, self.NOEUDS,context,champs, QgsWkbTypes.Point, layer.sourceCrs())

src=QgsCoordinateReferenceSystem(layer.crs())

dest=QgsCoordinateReferenceSystem("EPSG:4326")

xtr=QgsCoordinateTransform(src,dest,QgsProject.instance())

for ligne in lines:

if len(sens)==0:

test_sens='1'

else:

if ligne[sens]=='1':

test_sens='1'

else:

test_sens='0'

gligne=ligne.geometry()

if test_sens=='1':

if gligne.wkbType()==QgsWkbTypes.MultiLineString:

g=gligne.asMultiPolyline()

na=g[0][0]

liba=str(int(xtr.transform(na)[0]*1e6+180*1e6)).zfill(9)+str(int(xtr.transform(na)[1]*1e6+180*1e6)).zfill(9)

nb=g[-1][-1]

libb=str(int(xtr.transform(nb)[0]*1e6+180*1e6)).zfill(9)+str(int(xtr.transform(nb)[1]*1e6+180*1e6)).zfill(9)

elif gligne.wkbType()==QgsWkbTypes.LineString:

g=gligne.AsPolyline()

na=g[0]

liba=str(int(xtr.transform(na)[0]*1e6+180*1e6)).zfill(9)+str(int(xtr.transform(na)[1]*1e6+180*1e6)).zfill(9)

nb=g[-1]

libb=str(int(xtr.transform(nb)[0]*1e6+180*1e6)).zfill(9)+str(int(xtr.transform(nb)[1]*1e6+180*1e6)).zfill(9)

if (na not in noeuds):

noeuds[na]=(prefixe+liba,1)

else:

noeuds[na]=(prefixe+liba,noeuds[na][1]+1)

if (nb not in noeuds):

noeuds[nb]=(prefixe+libb,1)

else:

noeuds[nb]=(prefixe+libb,noeuds[nb][1]+1)

#outs=open("c:/temp/noeuds.txt","w")

for i,n in enumerate(noeuds):

node=QgsFeature()

node.setGeometry(QgsGeometry.fromPointXY(QgsPointXY(n[0],n[1])))

#node.setAttributes([noeuds[n]])

#feedback.setProgressText(unicode(i)+" "+unicode(ident[0])+" "+unicode(ident[0]=='0'))

if ident[0]=='0':

noeuds[n]=(prefixe+unicode(i),noeuds[n][1])

#feedback.setProgressText(unicode(noeuds[n][0]))

node.setAttributes([noeuds[n][0],noeuds[n][1]])

table_noeuds.addFeature(node)

#outs.write(str(n)+";"+str(noeuds[n])+"\n")

del table_noeuds

#outs.close()

lines=layer.getFeatures()

layer.startEditing()

layer.beginEditCommand(QCoreApplication.translate("Building graph","Building graph"))

for ligne in lines:

if len(sens)==0:

test_sens='1'

else:

if ligne[sens]=='1':

test_sens='1'

else:

test_sens='0'

if test_sens=='1':

gligne=ligne.geometry()

if gligne.wkbType()==QgsWkbTypes.MultiLineString:

g=gligne.asMultiPolyline()

na=g[0][0]

nb=g[-1][-1]

liba=str(int(xtr.transform(na)[0]*1e6+180*1e6)).zfill(9)+str(int(xtr.transform(na)[1]*1e6+180*1e6)).zfill(9)

libb=str(int(xtr.transform(nb)[0]*1e6+180*1e6)).zfill(9)+str(int(xtr.transform(nb)[1]*1e6+180*1e6)).zfill(9)

elif gligne.wkbType()==QgsWkbTypes.LineString:

g=gligne.asPolyline()

na=g[0]

nb=g[-1]

liba=str(int(xtr.transform(na)[0]*1e6+180*1e6)).zfill(9)+str(int(xtr.transform(na)[1]*1e6+180*1e6)).zfill(9)

libb=str(int(xtr.transform(nb)[0]*1e6+180*1e6)).zfill(9)+str(int(xtr.transform(nb)[1]*1e6+180*1e6)).zfill(9)

id=ligne.id()

#valid={ida : noeuds[na], idb: noeuds[nb]}

layer.changeAttributeValue(id,ida, unicode(noeuds[na][0]))

layer.changeAttributeValue(id,idb, unicode(noeuds[nb][0]))

layer.changeAttributeValue(id,idij, unicode(noeuds[na][0]+"-"+noeuds[nb][0]))

layer.commitChanges()

layer.endEditCommand()

return {self.NOEUDS: dest_id}

def name(self):

"""

Returns the algorithm name, used for identifying the algorithm. This

string should be fixed for the algorithm, and must not be localised.

The name should be unique within each provider. Names should contain

lowercase alphanumeric characters only and no spaces or other

formatting characters.

"""

return 'build_graph'

def displayName(self):

"""

Returns the translated algorithm name, which should be used for any

user-visible display of the algorithm name.

"""

return self.tr('Build graph')

def group(self):

"""

Returns the name of the group this algorithm belongs to. This string

should be localised.

"""

return self.tr('Network')

def groupId(self):

"""

Returns the unique ID of the group this algorithm belongs to. This

string should be fixed for the algorithm, and must not be localised.

The group id should be unique within each provider. Group id should

contain lowercase alphanumeric characters only and no spaces or other

formatting characters.

"""

return 'Network'

def tr(self, string):

return QCoreApplication.translate('CreerGraphe', string)

def shortHelpString(self):

return self.tr("""

Build a graph from a linear layer (create a node layer, i and j fields filled with node id at start and end node) taking into account the direction of flows

Parameters:

network : Network layer (linear objects)

prefix: prefix for node ids (ex: 'MAP' and n° 12563 => MAP12563)

node_id: the format of the node_id string: number series or geographic string (uniqueid which is consistent when you add several adjacent layers)

direction: flow direction ('0' prohibited, '1' one way objet direction, '2', one way inverse object direction, '3' both directions

nodes_file: nodes layer (arcs ends)

""")

def createInstance(self):