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# -*- coding: utf-8 -*-
#-----------------------------------------------------------
#
# Eliminate for fTools
# Copyright (C) 2011 Bernhard Ströbl
# EMAIL: bernhard.stroebl@jena.de
#
# Eliminate sliver polygons
#
#-----------------------------------------------------------
#
# licensed under the terms of GNU GPL 2
#
# 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.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
#---------------------------------------------------------------------
from PyQt4 import QtCore, QtGui
from qgis.core import *
import ftools_utils
from ui_frmEliminate import Ui_Dialog
class Dialog(QtGui.QDialog, Ui_Dialog):
def __init__(self, iface):
QtGui.QDialog.__init__(self)
self.iface = iface
# Set up the user interface from Designer.
self.setupUi(self)
QtCore.QObject.connect(self.toolOut, QtCore.SIGNAL("clicked()"), self.outFile)
QtCore.QObject.connect(self.inShape, QtCore.SIGNAL("currentIndexChanged(QString)"), self.update)
self.setWindowTitle(self.tr("Eliminate sliver polygons"))
self.buttonOk = self.buttonBox_2.button(QtGui.QDialogButtonBox.Ok)
# populate layer list
self.progressBar.setValue(0)
self.area.setChecked(True)
layers = ftools_utils.getLayerNames([QGis.Polygon])
self.inShape.addItems(layers)
if len(layers) > 0:
self.update(layers[0])
def update(self, inputLayer):
changedLayer = ftools_utils.getVectorLayerByName(inputLayer)
selFeatures = changedLayer.selectedFeatureCount()
self.selected.setText( self.tr("Selected features: %s") % (selFeatures))
def accept(self):
self.buttonOk.setEnabled(False)
if self.inShape.currentText() == "":
QtGui.QMessageBox.information(self, self.tr("Eliminate"), self.tr("No input shapefile specified"))
else:
outFileName = self.outShape.text()
if outFileName == "":
QtGui.QMessageBox.information(self, self.tr("Eliminate"), self.tr("Please specify output shapefile"))
self.buttonOk.setEnabled(True)
return None
else:
outFile = QtCore.QFile(outFileName)
if outFile.exists():
if not QgsVectorFileWriter.deleteShapeFile(outFileName):
QtGui.QMessageBox.warning(self, self.tr("Delete error"),
self.tr("Can't delete file %s") % (outFileName))
self.buttonOk.setEnabled(True)
return None
outFileName = unicode(outFileName)
inLayer = ftools_utils.getVectorLayerByName(unicode(self.inShape.currentText()))
if inLayer.selectedFeatureCount() == 0:
QtGui.QMessageBox.information(self, self.tr("Eliminate"), self.tr("No selection in input layer"))
else:
self.progressBar.setValue(5)
boundary = self.boundary.isChecked()
self.eliminate(inLayer, boundary, self.progressBar, outFileName)
self.progressBar.setValue(100)
self.outShape.clear()
self.progressBar.setValue(0)
self.buttonOk.setEnabled(True)
def outFile(self):
self.outShape.clear()
(outFileName, self.encoding) = ftools_utils.saveDialog(self)
if outFileName is None or self.encoding is None:
return None
self.outShape.setText(outFileName)
def saveChanges(self, outLayer):
if outLayer.commitChanges():
return True
else:
msg = ""
for aStrm in outLayer.commitErrors():
msg = msg + "\n" + aStrm
QtGui.QMessageBox.warning(self, self.tr("Eliminate"), self.tr("Commit error:\n%s") % (msg))
outLayer.rollBack()
return False
def eliminate(self, inLayer, boundary, progressBar, outFileName):
# keep references to the features to eliminate
fidsToEliminate = inLayer.selectedFeaturesIds()
if outFileName: # user wants a new shape file to be created as result
provider = inLayer.dataProvider()
error = QgsVectorFileWriter.writeAsVectorFormat(inLayer, outFileName, provider.encoding(), inLayer.crs(), "ESRI Shapefile")
if error != QgsVectorFileWriter.NoError:
QtGui.QMessageBox.warning(self, self.tr("Eliminate"), self.tr("Error creating output file"))
return None
outLayer = QgsVectorLayer(outFileName, QtCore.QFileInfo(outFileName).completeBaseName(), "ogr")
else:
QtGui.QMessageBox.information(self, self.tr("Eliminate"), self.tr("Please specify output shapefile"))
return None
# delete features to be eliminated in outLayer
outLayer.setSelectedFeatures(fidsToEliminate)
outLayer.startEditing()
if outLayer.deleteSelectedFeatures():
if self.saveChanges(outLayer):
outLayer.startEditing()
else:
QtGui.QMessageBox.warning(self, self.tr("Eliminate"), self.tr("Could not delete features"))
return None
# ANALYZE
start = 20.00
progressBar.setValue(start)
add = 80.00 / len(fidsToEliminate)
lastLen = 0
geomsToMerge = dict()
# we go through the list and see if we find any polygons we can merge the selected with
# if we have no success with some we merge and then restart the whole story
while (lastLen != inLayer.selectedFeatureCount()): #check if we made any progress
lastLen = inLayer.selectedFeatureCount()
fidsToDeselect = []
#iterate over the polygons to eliminate
for fid2Eliminate in inLayer.selectedFeaturesIds():
feat = QgsFeature()
if inLayer.getFeatures( QgsFeatureRequest().setFilterFid( fid2Eliminate ).setSubsetOfAttributes([]) ).nextFeature( feat ):
geom2Eliminate = feat.geometry()
bbox = geom2Eliminate.boundingBox()
fit = outLayer.getFeatures( QgsFeatureRequest().setFilterRect( bbox ) )
mergeWithFid = None
mergeWithGeom = None
max = 0
selFeat = QgsFeature()
while fit.nextFeature(selFeat):
selGeom = selFeat.geometry()
if geom2Eliminate.intersects(selGeom): # we have a candidate
iGeom = geom2Eliminate.intersection(selGeom)
if boundary:
selValue = iGeom.length()
else:
# we need a common boundary
if 0 < iGeom.length():
selValue = selGeom.area()
else:
selValue = 0
if selValue > max:
max = selValue
mergeWithFid = selFeat.id()
mergeWithGeom = QgsGeometry(selGeom) # deep copy of the geometry
if mergeWithFid != None: # a successful candidate
newGeom = mergeWithGeom.combine(geom2Eliminate)
if outLayer.changeGeometry(mergeWithFid, newGeom):
# write change back to disc
if self.saveChanges(outLayer):
outLayer.startEditing()
else:
return None
# mark feature as eliminated in inLayer
fidsToDeselect.append(fid2Eliminate)
else:
QtGui.QMessageBox.warning(self, self.tr("Eliminate"),
self.tr("Could not replace geometry of feature with id %s") % (mergeWithFid))
return None
start = start + add
progressBar.setValue(start)
# end for fid2Eliminate
# deselect features that are already eliminated in inLayer
inLayer.deselect(fidsToDeselect)
#end while
if inLayer.selectedFeatureCount() > 0:
# copy all features that could not be eliminated to outLayer
if outLayer.addFeatures(inLayer.selectedFeatures()):
# inform user
fidList = ""
for fid in inLayer.selectedFeaturesIds():
if not fidList == "":
fidList += ", "
fidList += str(fid)
QtGui.QMessageBox.information(self, self.tr("Eliminate"),
self.tr("Could not eliminate features with these ids:\n%s") % (fidList))
else:
QtGui.QMessageBox.warning(self, self.tr("Eliminate"), self.tr("Could not add features"))
# stop editing outLayer and commit any pending changes
if not self.saveChanges(outLayer):
return None
if outFileName:
if self.addToCanvasCheck.isChecked():
ftools_utils.addShapeToCanvas(outFileName)
else:
QtGui.QMessageBox.information(self, self.tr("Eliminate"),
self.tr("Created output shapefile:\n%s") % (outFileName))
self.iface.mapCanvas().refresh()
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