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mergear_na_direcao.py
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"""
/***************************************************************************
3 CGEO
3th Brazilian Geoinformation Center
-------------------
begin : 2017-03-31
copyright : (C) 2017 by Leandro Franca - Cartographic Engineer @ Brazilian Army
email : franca.leandro@eb.mil.br
***************************************************************************/
/***************************************************************************
* *
* 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. *
* *
***************************************************************************/
"""
# Consertar Linhas
##1. Mergear na Direcao=name
##arquivo=vector
##tolerancia=number 10
##saida=output vector
##LF4) Vetor=group
# inputs
filename = arquivo
output_name = saida
tol = tolerancia
from math import atan2, degrees, fabs
from PyQt4.QtCore import *
from qgis.gui import QgsMessageBar
from qgis.utils import iface
from qgis.core import *
import time
import processing
# Abrir layer de linhas
linhas = processing.getObject(filename)
progress.setInfo('<b>Iniciando processamento...</b><br/>')
# Funcao que pega ponto incial e final e os seus angulos
def pontos_ang(geom):
coord = geom.asPolyline()
if coord != []:
# Tangente entre o primeiro e segundo ponto
Xa = coord[0].x()
Xb = coord[1].x()
Ya = coord[0].y()
Yb = coord[1].y()
ang_ini = degrees(atan2(Yb-Ya,Xb-Xa))
Xa = coord[-2].x()
Xb = coord[-1].x()
Ya = coord[-2].y()
Yb = coord[-1].y()
ang_fim = degrees(atan2(Yb-Ya,Xb-Xa))
else:
print 'Feicao nao prevista!'
return [[coord, coord[0], coord[-1], ang_ini, ang_fim]]
# Criar lista com as geometrias
lista = []
for feature in linhas.getFeatures():
id = feature.id()
geom = feature.geometry()
lista += pontos_ang(geom)
# Funcao para dar a direcao oposta
def contraAz(x):
if x<=0:
return x+180
else:
return x-180
# Criar uma nova lista com as feicoes finais mergeadas
nova_lista = []
# Remover os aneis lineares da lista e acrescentar na nova lista
ind = 0
while ind < len(lista)-1:
P_ini = lista[ind][1]
P_fim = lista[ind][2]
if P_ini==P_fim:
nova_lista+= [lista[ind][0]]
del lista[ind]
else:
ind +=1
# Mergear os que se tocam e tem mesma direcao
while len(lista)>1:
tam = len(lista)
for i in range(0,tam-1):
mergeou = False
# Ponto inicial e final da feicao A
coord_A = lista[i][0]
P_ini_A = lista[i][1]
P_fim_A = lista[i][2]
ang_ini_A = lista[i][3]
ang_fim_A = lista[i][4]
for j in range(i+1,tam):
# Ponto inicial e final da feicao B
coord_B = lista[j][0]
P_ini_B = lista[j][1]
P_fim_B = lista[j][2]
ang_ini_B = lista[j][3]
ang_fim_B = lista[j][4]
# 4 possibilidades
# 1 - Ponto final de A igual ao ponto inicial de B
if (P_fim_A == P_ini_B) and (fabs(ang_fim_A-ang_ini_B)<tol or fabs(360-fabs(ang_fim_A-ang_ini_B))<tol):
mergeou = True
break
# 2 - Ponto inicial de A igual ao ponto final de B
elif (P_ini_A == P_fim_B) and (fabs(ang_ini_A-ang_fim_B)<tol or fabs(360-fabs(ang_ini_A-ang_fim_B))<tol):
mergeou = True
break
# 3 - Ponto incial de A igual ao ponto inicial de B
elif (P_ini_A == P_ini_B) and (fabs(ang_ini_A-contraAz(ang_ini_B))<tol or fabs(360-fabs(ang_ini_A-contraAz(ang_ini_B)))<tol):
mergeou = True
break
# 4 - Ponto final de A igual ao ponto final de B
elif (P_fim_A == P_fim_B) and (fabs(ang_fim_A-contraAz(ang_fim_B))<tol or fabs(360-fabs(ang_fim_A-contraAz(ang_fim_B)))<tol):
mergeou = True
break
if mergeou:
geom_A = QgsGeometry.fromPolyline(coord_A)
geom_B = QgsGeometry.fromPolyline(coord_B)
new_geom = geom_A.combine(geom_B)
if new_geom.isMultipart():
nova_lista += [coord_A, coord_B]
del lista[i], lista[j-1]
break
else:
del lista[i], lista[j-1]
lista = pontos_ang(new_geom)+lista
break
if not(mergeou):
# Tirar a geometria que nao se conecta com nada da lista
nova_lista += [lista[i][0]]
del lista[i]
break
if len(lista)==1:
nova_lista += [lista[0][0]]
# Criando o shapefile de saida
progress.setInfo('<b>Criando shapefile de saida...</b><br/>')
path_name = output_name
encoding = 'utf-8'
formato = 'ESRI Shapefile'
crs = linhas.crs()
# Criar campos
fields = QgsFields()
fields.append(QgsField('ID', QVariant.Int))
writer = QgsVectorFileWriter(path_name, encoding, fields, QGis.WKBLineString, crs, formato)
for index, coord in enumerate(nova_lista):
feature = QgsFeature()
feature.setGeometry(QgsGeometry.fromPolyline(coord))
feature.setAttributes([index])
writer.addFeature(feature)
del writer
progress.setInfo('<b>Operacao concluida!</b><br/><br/>')
progress.setInfo('<b>Leandro França - Eng Cart</b><br/>')
iface.messageBar().pushMessage(u'Situacao', "Operacao Concluida com Sucesso!", level=QgsMessageBar.INFO, duration=5)
time.sleep(3)