"""

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'

TRAFIC='TRAFIC'

ECHELLE='ECHELLE'

ANGLE_MAX='ANGLE_MAX'

DIST_MIN='DIST_MIN'

DOUBLE_SENS='DOUBLE_SENS'

POLYGONES='POLYGONES'

ACCROCHAGE='ACCROCHAGE'

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')

)

)

self.addParameter(

QgsProcessingParameterField(

self.TRAFIC,

self.tr('Width'),

parentLayerParameterName=self.RESEAU

)

)

self.addParameter(

QgsProcessingParameterNumber(

self.ECHELLE,

self.tr('Scale'),

QgsProcessingParameterNumber.Double,

defaultValue=1.0

)

)

self.addParameter(

QgsProcessingParameterNumber(

self.ANGLE_MAX,

self.tr('Max angle(degrees)'),

QgsProcessingParameterNumber.Double,

defaultValue=60.0

)

)

self.addParameter(

QgsProcessingParameterNumber(

self.DIST_MIN,

self.tr('Min distance(m)'),

QgsProcessingParameterNumber.Double,

defaultValue=50.0

)

)

self.addParameter(

QgsProcessingParameterNumber(

self.ACCROCHAGE,

self.tr('Snap distance(m)'),

QgsProcessingParameterNumber.Double,

defaultValue=10.0

)

)

self.addParameter(

QgsProcessingParameterBoolean(

self.DOUBLE_SENS,

self.tr('Both directions?'),

defaultValue=False

)

)

self.addParameter(

QgsProcessingParameterFeatureSink(

self.POLYGONES,

self.tr('Variable buffer polygons'),

)

)

# 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 traf(self,geometry,trafic,spatial,lines,echelle,angle_max,dist_min,double_sens,snap_dist):

lignes=lines

conn = db.connect(':memory:')

conn.enable_load_extension(True)

conn.execute("select load_extension('mod_spatialite')")

c = conn.cursor()

proj=str(self.lines.crs().postgisSrid())

t=geometry[trafic]

texte="select astext(st_buffer(st_geomfromtext('"+geometry.geometry().asWkt()+"',"+proj+"),"+str(echelle*t)+"))"

rs = c.execute(texte)

resultat=c.fetchall()

conn.commit()

texte_buf= resultat[0][0]

texte_buf=texte_buf.replace("Polygon","MultiLineString")

buf=QgsGeometry.fromWkt(texte_buf)

#buf=buf.convertToType(QgsWkbTypes.LineGeometry,False)

texte="select astext(st_union(st_exteriorring(st_geomfromtext('"+buf.asWkt()+"',"+proj+"))))"

rs = c.execute(texte)

resultat=c.fetchall()

conn.commit()

buf= QgsGeometry.fromWkt(resultat[0][0])

#QgsMessageLog.logMessage(texte)

#QgsMessageLog.logMessage(buf.asWkt())

buf_poly=buf

geom=geometry.geometry()

buf_sav=buf

buf_l=buf.length()

l2=QgsLineString()

#print(geom.asWkt())

geom.convertToSingleType()

#print(geom.asWkt())

l2.fromWkt(geom.asWkt())

#print(l2.asWkt())

pt1=QgsGeometry(l2.startPoint())

pt2=QgsGeometry(l2.endPoint())

###point debut

debut=spatial.intersects(QgsGeometry.buffer(pt1,snap_dist,3).boundingBox())

fe= [f for f in debut]

feats=[]

for f in fe:

ff=QgsLineString()

#QgsMessageLog.logMessage(lignes[f].geometry().asWkt())

geom=lignes[f].geometry()

geom.convertToSingleType()

ff.fromWkt(geom.asWkt())

#QgsMessageLog.logMessage(ff.asWkt())

#print(pt1.distance(QgsGeometry(ff.startPoint())))

if pt1.distance(QgsGeometry(ff.startPoint()))<snap_dist:

if lignes[f] not in feats:

feats.append(f)

elif pt1.distance(QgsGeometry(ff.endPoint()))<snap_dist:

if lignes[f] not in feats:

feats.append(f)

#QgsMessageLog.logMessage(str(fe))

#QgsMessageLog.logMessage(str(feats))

distances={}

angles={}

for i in feats:

longueur=lignes[i].geometry().length()

if not(geometry.id()==i):

distances[i]=lignes[i].geometry().lineLocatePoint(pt1)

if distances[i]<dist_min:

angles[i]=((lignes[i].geometry().interpolateAngle(min(dist_min,longueur))*180/math.pi)+180)%360

else:

angles[i]=lignes[i].geometry().interpolateAngle(longueur-min(dist_min,longueur))*180/math.pi

else:

angle1=lignes[i].geometry().interpolateAngle(min(dist_min,longueur))*180/math.pi

angle_maxi=1e38

voisin=None

angle_voisin=None

angle2=None

if len(distances)==0:

angle=(angle1)%360

angle2=angle1

angle_voisin=angle2

for i in distances:

if distances[i]<dist_min:

angle=(angles[i])%360

min_angle=min(abs((angle+180)%360-(angle1+180)%360),abs(angle-angle1))

if min_angle<angle_maxi:

angle_maxi=min_angle

angle_voisin=angle

voisin=i

else:

angle=angles[i]

min_angle=min(abs((angle+180)%360-(angle1+180)%360),abs(angle-angle1))

if min_angle<angle_maxi:

angle_maxi=min_angle

angle_voisin=angle

voisin=i

if min(abs((angle_voisin+180)%360-(angle1+180)%360),abs(angle_voisin-angle1))<angle_max:

if abs((angle_voisin+180)%360-(angle1+180)%360)<abs(angle_voisin-angle1):

angle2=(0.5*(((angle_voisin+180)%360+(angle1+180)%360))+180)%360

else:

angle2=0.5*(angle_voisin+angle1)

else:

angle2=angle1

if angle2==None:

angle2=(angle1)%360

start_line=QgsGeometry.fromPolyline([QgsPoint(pt1.asPoint().x()-40*echelle*t*math.cos((180-angle2)*math.pi/180),pt1.asPoint().y()-40*echelle*t*math.sin((180-angle2)*math.pi/180)),QgsPoint(pt1.asPoint().x(),pt1.asPoint().y())])

int1=buf.intersection(start_line)

start_line2=QgsGeometry.fromPolyline([QgsPoint(pt1.asPoint().x()+40*echelle*t*math.cos((180-angle2)*math.pi/180),pt1.asPoint().y()+40*echelle*t*math.sin((180-angle2)*math.pi/180)),QgsPoint(pt1.asPoint().x(),pt1.asPoint().y())])

int3=buf.intersection(start_line2)

if int1.isMultipart():

points=int1.asMultiPoint()

dmax=1e38

for p in points:

d=pt1.distance(QgsGeometry.fromPointXY(p))

if d<dmax:

dmax=d

pmax=p

int1=QgsGeometry.fromPointXY(pmax)

if int3.isMultipart():

points=int3.asMultiPoint()

dmax=1e38

for p in points:

d=pt1.distance(QgsGeometry.fromPointXY(p))

if d<dmax:

dmax=d

pmax=p

int3=QgsGeometry.fromPointXY(pmax)

###point fin

debut=spatial.intersects(QgsGeometry.buffer(pt2,snap_dist,3).boundingBox())

fe= [f for f in debut]

for f in fe:

ff=QgsLineString()

geom=lignes[f].geometry()

geom.convertToSingleType()

ff.fromWkt(geom.asWkt())

if pt2.distance(QgsGeometry(ff.startPoint()))<snap_dist:

if lignes[f] not in feats:

feats.append(f)

elif pt2.distance(QgsGeometry(ff.endPoint()))<snap_dist:

if lignes[f] not in feats:

feats.append(f)

distances={}

angles={}

for i in feats:

longueur=lignes[i].geometry().length()

if not(geometry.id()==i):

distances[i]=lignes[i].geometry().lineLocatePoint(pt2)

if distances[i]<dist_min:

angles[i]=(lignes[i].geometry().interpolateAngle(min(dist_min,longueur))*180/math.pi)%360

else:

angles[i]=(((lignes[i].geometry().interpolateAngle(longueur-min(dist_min,longueur))*180)/math.pi)+180)%360

else:

angle1=((lignes[i].geometry().interpolateAngle(longueur-min(dist_min,longueur))*180/math.pi))

angle_maxi=1e38

voisin=None

angle_voisin=None

angle2=None

if len(distances)==0:

angle=(angle1)%360

angle2=angle1

angle_voisin=angle2

for i in distances:

if distances[i]<dist_min:

angle=(angles[i])

min_angle=min(abs((angle+180)%360-(angle1+180)%360),abs(angle-angle1))

if min_angle<angle_maxi:

angle_maxi=min_angle

angle_voisin=angle

voisin=i

else:

angle=(angles[i])

min_angle=min(abs((angle+180)%360-(angle1+180)%360),abs(angle-angle1))

if min_angle<angle_maxi:

angle_maxi=min_angle

angle_voisin=angle

voisin=i

if min(abs((angle_voisin+180)%360-(angle1+180)%360),abs(angle_voisin-angle1))<angle_max:

if abs((angle_voisin+180)%360-(angle1+180)%360)<abs(angle_voisin-angle1):

angle2=(0.5*(((angle_voisin+180)%360+(angle1+180)%360))+180)%360

else:

angle2=0.5*(angle_voisin+angle1)

else:

angle2=angle1

if angle2==None:

angle2=(angle1)%360

end_line=QgsGeometry.fromPolyline([QgsPoint(pt2.asPoint().x()-40*echelle*t*math.cos((180-angle2)*math.pi/180),pt2.asPoint().y()-40*echelle*t*math.sin((180-angle2)*math.pi/180)),QgsPoint(pt2.asPoint().x(),pt2.asPoint().y())])

int2=buf.intersection(end_line)

end_line2=QgsGeometry.fromPolyline([QgsPoint(pt2.asPoint().x()+40*echelle*t*math.cos((180-angle2)*math.pi/180),pt2.asPoint().y()+40*echelle*t*math.sin((180-angle2)*math.pi/180)),QgsPoint(pt2.asPoint().x(),pt2.asPoint().y())])

int4=buf.intersection(end_line2)

int5=start_line.intersection(end_line)

int6=start_line2.intersection(end_line2)

m5=-1

m6=-1

if int5.type()==0:

if int5.within(buf_poly):

m5=1

if int6.type()==0:

if int6.within(buf_poly):

m6=1

if int2.isMultipart():

points=int2.asMultiPoint()

dmax=1e38

for p in points:

d=pt2.distance(QgsGeometry.fromPointXY(p))

if d<dmax:

dmax=d

pmax=p

int2=QgsGeometry.fromPointXY(pmax)

if int4.isMultipart():

points=int4.asMultiPoint()

dmax=1e38

for p in points:

d=pt2.distance(QgsGeometry.fromPointXY(p))

if d<dmax:

dmax=d

pmax=p

int4=QgsGeometry.fromPointXY(pmax)

#print(int1.exportToWkt(),int2.exportToWkt(),int3.exportToWkt(),int4.exportToWkt())

#QgsMessageLog.logMessage(buf.asWkt())

texte="select astext(st_union(st_snap(st_geomfromtext('"+buf.asWkt()+"',"+proj+"),st_geomfromtext('"+int1.asWkt()+"',"+proj+"),1)))"

rs = c.execute(texte)

resultat=c.fetchall()

conn.commit()

buf= resultat[0][0]

#QgsMessageLog.logMessage(texte)

#QgsMessageLog.logMessage(buf)

#QgsMessageLog.logMessage(proj)

#QgsMessageLog.logMessage(int2.asWkt())

texte="select astext(st_union(st_snap(st_geomfromtext('"+buf+"',"+proj+"),st_geomfromtext('"+int2.asWkt()+"',"+proj+"),1)))"

rs = c.execute(texte)

resultat=c.fetchall()

conn.commit()

buf= resultat[0][0]

texte="select astext(st_union(st_snap(st_geomfromtext('"+buf+"',"+proj+"),st_geomfromtext('"+int3.asWkt()+"',"+proj+"),1)))"

rs = c.execute(texte)

resultat=c.fetchall()

conn.commit()

buf= resultat[0][0]

texte="select astext(st_union(st_snap(st_geomfromtext('"+buf+"',"+proj+"),st_geomfromtext('"+int4.asWkt()+"',"+proj+"),1)))"

rs = c.execute(texte)

resultat=c.fetchall()

conn.commit()

buf= QgsGeometry.fromWkt(resultat[0][0])

m1=buf.lineLocatePoint(int1)

m2=buf.lineLocatePoint(int2)

m3=buf.lineLocatePoint(int3)

m4=buf.lineLocatePoint(int4)

#creation epaisseur

buf_l=buf.length()

m1=m1/buf_l

m2=m2/buf_l

m3=m3/buf_l

m4=m4/buf_l

if m2<m1:

texte="select asText(st_line_substring(st_geomfromtext('"+buf.asWkt()+"',"+proj+")"+','+str(m2)+','+str(m1)+"))"

rs = c.execute(texte)

resultat=c.fetchall()

conn.commit()

buf1= QgsGeometry.fromWkt(resultat[0][0])

else:

texte="select astext(st_union(st_snap(st_line_substring(geomfromtext('"+buf.asWkt()+"',"+proj+"),0,"+str(m1)+"),st_line_substring(geomfromtext('"+buf.asWkt()+"',"+proj+"),"+str(m3)+",1),1),st_line_substring(geomfromtext('"+buf.asWkt()+"',"+proj+"),"+str(m2)+",1)))"

rs = c.execute(texte)

resultat=c.fetchall()

conn.commit()

buf1= QgsGeometry.fromWkt(resultat[0][0])

if m3<m4:

texte="select asText(st_line_substring(st_geomfromtext('"+buf.asWkt()+"',"+proj+")"+','+str(m3)+','+str(m4)+"))"

rs = c.execute(texte)

resultat=c.fetchall()

conn.commit()

buf2= QgsGeometry.fromWkt(resultat[0][0])

else:

texte="select astext(st_union(g)) from (select st_line_substring(st_geomfromtext('"+buf.asWkt()+"',"+proj+"),0,"+str(m4)+") as \"g\" union all select st_line_substring(st_geomfromtext('"+buf.asWkt()+"',"+proj+"),"+str(m3)+",1) as \"g\" )"

rs = c.execute(texte)

resultat=c.fetchall()

conn.commit()

buf2= QgsGeometry.fromWkt(resultat[0][0])

texte="select astext(st_union(st_snap(st_line_substring(geomfromtext('"+buf.asWkt()+"',"+proj+"),0,"+str(m4)+"),st_line_substring(geomfromtext('"+buf.asWkt()+"',"+proj+"),"+str(m3)+",1),1),st_line_substring(geomfromtext('"+buf.asWkt()+"',"+proj+"),"+str(m3)+",1)))"

rs = c.execute(texte)

resultat=c.fetchall()

conn.commit()

buf2= QgsGeometry.fromWkt(resultat[0][0])

g1=buf

g2=buf.shortestLine(int1)

g2=g2.combine(g1)

g3=buf.shortestLine(int2)

g3=g3.combine(g2)

g3=g3.combine(pt1.shortestLine(int1))

g3=g3.combine(pt2.shortestLine(int2))

g3=g3.combine(pt1.shortestLine(geometry.geometry()))

g3=g3.combine(pt2.shortestLine(geometry.geometry()))

g3=g3.combine(geometry.geometry())

buf3=buf1.asWkt()

buf4=buf2.asWkt()

if double_sens==False:

if m5>0:

texte="select astext(st_union(st_snap(geomfromtext('"+geometry.geometry().asWkt()+"',"+proj+"),geomfromtext('"+pt1.shortestLine(int5).asWkt()+"',"+proj+"),1),geomfromtext('"+pt1.shortestLine(int5).asWkt()+"',"+proj+")))"

rs = c.execute(texte)

resultat=c.fetchall()

conn.commit()

buf3= resultat[0][0]

texte="select astext(st_union(st_snap(geomfromtext('"+buf3+"',"+proj+"),geomfromtext('"+pt2.shortestLine(int5).asWkt()+"',"+proj+"),1),geomfromtext('"+pt2.shortestLine(int5).asWkt()+"',"+proj+")))"

rs = c.execute(texte)

resultat=c.fetchall()

conn.commit()

buf3= resultat[0][0]

else:

texte="select astext(st_union(st_snap(geomfromtext('"+buf3+"',"+proj+"),geomfromtext('"+buf1.shortestLine(int1).asWkt()+"',"+proj+"),1),geomfromtext('"+buf1.shortestLine(int1).asWkt()+"',"+proj+")))"

rs = c.execute(texte)

resultat=c.fetchall()

conn.commit()

buf3= resultat[0][0]

texte="select astext(st_union(st_snap(geomfromtext('"+buf3+"',"+proj+"),geomfromtext('"+buf1.shortestLine(int2).asWkt()+"',"+proj+"),1),geomfromtext('"+buf1.shortestLine(int2).asWkt()+"',"+proj+")))"

rs = c.execute(texte)

resultat=c.fetchall()

conn.commit()

buf3= resultat[0][0]

texte="select astext(st_union(st_snap(geomfromtext('"+buf3+"',"+proj+"),geomfromtext('"+pt1.shortestLine(int1).asWkt()+"',"+proj+"),1),geomfromtext('"+pt1.shortestLine(int1).asWkt()+"',"+proj+")))"

rs = c.execute(texte)

resultat=c.fetchall()

conn.commit()

buf3= resultat[0][0]

texte="select astext(st_union(st_snap(geomfromtext('"+buf3+"',"+proj+"),geomfromtext('"+pt2.shortestLine(int2).asWkt()+"'),1),geomfromtext('"+pt2.shortestLine(int2).asWkt()+"',"+proj+")))"

rs = c.execute(texte)

resultat=c.fetchall()

conn.commit()

buf3= resultat[0][0]

texte="select astext(st_union(st_snap(geomfromtext('"+buf3+"',"+proj+"),geomfromtext('"+pt1.shortestLine(geometry.geometry()).asWkt()+"',"+proj+"),1),geomfromtext('"+pt1.shortestLine(geometry.geometry()).asWkt()+"',"+proj+")))"

rs = c.execute(texte)

resultat=c.fetchall()

conn.commit()

buf3= resultat[0][0]

texte="select astext(st_union(st_snap(geomfromtext('"+buf3+"',"+proj+"),geomfromtext('"+pt2.shortestLine(geometry.geometry()).asWkt()+"',"+proj+"),1),geomfromtext('"+pt2.shortestLine(geometry.geometry()).asWkt()+"',"+proj+")))"

rs = c.execute(texte)

resultat=c.fetchall()

conn.commit()

texte="select astext(st_union(st_snap(geomfromtext('"+buf3+"',"+proj+"),geomfromtext('"+geometry.geometry().asWkt()+"',"+proj+"),1),geomfromtext('"+geometry.geometry().asWkt()+"',"+proj+")))"

rs = c.execute(texte)

resultat=c.fetchall()

conn.commit()

buf3= resultat[0][0]

else:

if m5>0:

texte="select astext(st_union(st_snap(geomfromtext('"+buf4+"',"+proj+"),geomfromtext('"+pt1.shortestLine(int3).asWkt()+"',"+proj+"),1),geomfromtext('"+pt1.shortestLine(int3).asWkt()+"',"+proj+")))"

rs = c.execute(texte)

resultat=c.fetchall()

conn.commit()

buf3= resultat[0][0]

texte="select astext(st_union(st_snap(geomfromtext('"+buf3+"',"+proj+"),geomfromtext('"+pt2.shortestLine(int4).asWkt()+"',"+proj+"),1),geomfromtext('"+pt2.shortestLine(int4).asWkt()+"',"+proj+")))"

rs = c.execute(texte)

resultat=c.fetchall()

conn.commit()

buf3= resultat[0][0]

texte="select astext(st_union(st_snap(geomfromtext('"+buf3+"',"+proj+"),geomfromtext('"+pt1.shortestLine(int5).asWkt()+"',"+proj+"),1),geomfromtext('"+pt1.shortestLine(int5).asWkt()+"',"+proj+")))"

rs = c.execute(texte)

resultat=c.fetchall()

conn.commit()

buf3= resultat[0][0]

texte="select astext(st_union(st_snap(geomfromtext('"+buf3+"',"+proj+"),geomfromtext('"+pt2.shortestLine(int5).asWkt()+"',"+proj+"),1),geomfromtext('"+pt2.shortestLine(int5).asWkt()+"',"+proj+")))"

rs = c.execute(texte)

resultat=c.fetchall()

conn.commit()

buf3= resultat[0][0]

elif m6>0:

texte="select astext(st_union(st_snap(geomfromtext('"+buf3+"',"+proj+"),geomfromtext('"+pt1.shortestLine(int1).asWkt()+"',"+proj+"),1),geomfromtext('"+pt1.shortestLine(int1).asWkt()+"',"+proj+")))"

rs = c.execute(texte)

resultat=c.fetchall()

conn.commit()

buf3= resultat[0][0]

texte="select astext(st_union(st_snap(geomfromtext('"+buf3+"',"+proj+"),geomfromtext('"+pt2.shortestLine(int2).asWkt()+"',"+proj+"),1),geomfromtext('"+pt2.shortestLine(int2).asWkt()+"',"+proj+")))"

rs = c.execute(texte)

resultat=c.fetchall()

conn.commit()

buf3= resultat[0][0]

texte="select astext(st_union(st_snap(geomfromtext('"+buf3+"',"+proj+"),geomfromtext('"+pt1.shortestLine(int6).asWkt()+"',"+proj+"),1),geomfromtext('"+pt1.shortestLine(int6).asWkt()+"',"+proj+")))"

rs = c.execute(texte)

resultat=c.fetchall()

conn.commit()

buf3= resultat[0][0]

texte="select astext(st_union(st_snap(geomfromtext('"+buf3+"',"+proj+"),geomfromtext('"+pt2.shortestLine(int6).asWkt()+"',"+proj+"),1),geomfromtext('"+pt2.shortestLine(int6).asWkt()+"',"+proj+")))"

rs = c.execute(texte)

resultat=c.fetchall()

conn.commit()

buf3= resultat[0][0]

else:

texte="select astext(st_union(st_snap(geomfromtext('"+buf3+"',"+proj+"),geomfromtext('"+buf1.shortestLine(int1).asWkt()+"',"+proj+"),1),geomfromtext('"+buf1.shortestLine(int1).asWkt()+"',"+proj+")))"

rs = c.execute(texte)

resultat=c.fetchall()

conn.commit()

buf3= resultat[0][0]

texte="select astext(st_union(st_snap(geomfromtext('"+buf3+"',"+proj+"),geomfromtext('"+buf1.shortestLine(int2).asWkt()+"',"+proj+"),1),geomfromtext('"+buf1.shortestLine(int2).asWkt()+"',"+proj+")))"

rs = c.execute(texte)

resultat=c.fetchall()

conn.commit()

buf3= resultat[0][0]

texte="select astext(st_union(st_snap(geomfromtext('"+buf3+"',"+proj+"),geomfromtext('"+int3.shortestLine(int1).asWkt()+"',"+proj+"),1),geomfromtext('"+int3.shortestLine(int1).asWkt()+"',"+proj+")))"

rs = c.execute(texte)

resultat=c.fetchall()

conn.commit()

buf3= resultat[0][0]

texte="select astext(st_union(st_snap(geomfromtext('"+buf3+"',"+proj+"),geomfromtext('"+int4.shortestLine(int2).asWkt()+"',"+proj+"),1),geomfromtext('"+int4.shortestLine(int2).asWkt()+"',"+proj+")))"

rs = c.execute(texte)

resultat=c.fetchall()

conn.commit()

buf3= resultat[0][0]

texte="select astext(st_union(st_snap(geomfromtext('"+buf3+"',"+proj+"),geomfromtext('"+buf2.shortestLine(int3).asWkt()+"',"+proj+"),1),geomfromtext('"+buf2.shortestLine(int3).asWkt()+"',"+proj+")))"

rs = c.execute(texte)

resultat=c.fetchall()

conn.commit()

buf3= resultat[0][0]

texte="select astext(st_union(st_snap(geomfromtext('"+buf3+"',"+proj+"),geomfromtext('"+buf2.shortestLine(int4).asWkt()+"',"+proj+"),1),geomfromtext('"+buf2.shortestLine(int4).asWkt()+"',"+proj+")))"

rs = c.execute(texte)

resultat=c.fetchall()

conn.commit()

buf3= resultat[0][0]

texte="select astext(st_union(st_snap(geomfromtext('"+buf3+"',"+proj+"),geomfromtext('"+buf4+"',"+proj+"),1),geomfromtext('"+buf4+"',"+proj+")))"

rs = c.execute(texte)

resultat=c.fetchall()

conn.commit()

buf3= resultat[0][0]

texte="select astext(st_buildarea(st_union(g))) from ((select geomfromtext('"+buf3+"',"+proj+") as \"g\"))"

rs = c.execute(texte)

resultat=c.fetchall()

conn.commit()

buf=QgsGeometry.fromWkt(resultat[0][0])

return(buf)

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.

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

trafic=self.parameterAsFields(parameters,self.TRAFIC,context)[0]

echelle=self.parameterAsDouble(parameters,self.ECHELLE,context)

dist_min=self.parameterAsDouble(parameters,self.DIST_MIN,context)

snap_dist=self.parameterAsDouble(parameters,self.ACCROCHAGE,context)

angle_max=self.parameterAsDouble(parameters,self.ANGLE_MAX,context)

double_sens=self.parameterAsBool(parameters,self.DOUBLE_SENS,context)

self.lines=lignes

# get features from source

champs2=lignes.fields()

(table_tampons,tampons) = self.parameterAsSink(parameters, self.POLYGONES,context,champs2, QgsWkbTypes.MultiPolygon, lignes.crs())

id=QgsSpatialIndex(lignes.getFeatures())

l={}

for i in lignes.getFeatures():

l[i.id()]=i

#table_tampons=QgsVectorFileWriter(tampons,"UTF-8",champs,QGis.WKBMultiLineString,lines.crs(),"ESRI Shapefile")

for f in lignes.getFeatures():

try:

g=self.traf(f,trafic,id,l,echelle,angle_max,dist_min,double_sens,snap_dist)

#feedback.setProgressText(g.geometry().asWkt())

f.setGeometry(g)

table_tampons.addFeature(f)

except:

feedback.setProgressText(g.geometry().asWkt())

del table_tampons

return {self.POLYGONES:tampons}

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 'variable_buffer_polygons'

def displayName(self):

"""

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

user-visible display of the algorithm name.

"""

return self.tr('Variable buffer polygons')

def group(self):

"""

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

should be localised.

"""

return self.tr('Analysis')

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 'Analysis'

def shortHelpString(self):

return self.tr("""

Generates variable buffer polygons from a linear layer and a field containing a width variable

Parameters:

network: input layer name (linear objects)

width: width field

scale: scale factor for width in (m)

max_angle: maximum angle for nice cuts

min_distance: smi distance from arcs ends for angle estimation

Both directions?: check if two ways arc

Variable buffer polygons: Result layer (polygons proportionnal with proportionnal width)

""")

def tr(self, string):

return QCoreApplication.translate('Trafic', string)

def createInstance(self):