forked from warrieka/geopunt4Qgis
/
elevationHelper.py
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/
elevationHelper.py
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# -*- coding: utf-8 -*-
"""
/***************************************************************************
elevationHelper
A QGIS plugin
"Tool om geopunt in QGIS te gebruiken"
-------------------
begin : 2014-07-02
copyright : (C) 2014 by Kay Warrie
email : kaywarrie@gmail.com
***************************************************************************/
/***************************************************************************
* *
* 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. *
* *
***************************************************************************/
"""
import os.path
from PyQt4.QtCore import *
from PyQt4.QtGui import QFileDialog
from qgis.core import *
import numpy as np
from geometryhelper import geometryHelper
class elevationHelper:
def __init__(self , iface, startFolder=None ):
self.iface= iface
self.sampleslayerid = ''
self.profilelayerId = ''
self.startFolder= startFolder
def save_sample_points(self, pointData, profileName="", layername="elevation_samples", saveToFile=None, sender=None):
''
attributes = [ QgsField("name", QVariant.String),
QgsField("Dist", QVariant.Double), QgsField("z_taw", QVariant.Double) ]
if not QgsMapLayerRegistry.instance().mapLayer(self.sampleslayerid) :
self.sampleslayer = QgsVectorLayer("Point", layername, "memory")
self.samplesProvider = self.sampleslayer.dataProvider()
self.samplesProvider.addAttributes(attributes)
self.sampleslayer.updateFields()
fields= self.sampleslayer.pendingFields()
for point in pointData:
#create the geometry
pt = QgsPoint( point[1], point[2] )
# add a feature
fet = QgsFeature(fields)
#set geometry
fromCrs = QgsCoordinateReferenceSystem(4326)
xform = QgsCoordinateTransform( fromCrs, self.sampleslayer.crs() )
prjPt = xform.transform( pt )
fet.setGeometry(QgsGeometry.fromPoint(prjPt))
fet['name'] = profileName
fet['dist'] = point[0]
if point[3] > -9999 : fet['z_taw'] = point[3]
self.samplesProvider.addFeatures([ fet ])
self.sampleslayer.updateExtents()
if saveToFile and not QgsMapLayerRegistry.instance().mapLayer(self.sampleslayerid):
save = self._saveToFile( sender, os.path.join( self.startFolder, layername))
if save:
fpath, flType = save
error = QgsVectorFileWriter.writeAsVectorFormat(self.sampleslayer, fpath, "utf-8", None, flType, )
if error == QgsVectorFileWriter.NoError:
self.sampleslayer = QgsVectorLayer( fpath , layername, "ogr")
self.samplesProvider = self.sampleslayer.dataProvider()
else:
del self.sampleslayer, self.samplesProvider
return
else:
del self.sampleslayer, self.samplesProvider
return
# add layer if not already
QgsMapLayerRegistry.instance().addMapLayer(self.sampleslayer)
# store layer id and refresh
self.sampleslayerid = self.sampleslayer.id()
self.iface.mapCanvas().refresh()
def save_profile(self, lineGeom, pointData, profileName="", layername="elevation_line", saveToFile=None, sender=None):
attributes = [ QgsField("name", QVariant.String),
QgsField("maxZ", QVariant.Double),
QgsField("meanZ", QVariant.Double),
QgsField("minZ", QVariant.Double) ]
if not QgsMapLayerRegistry.instance().mapLayer(self.profilelayerId) :
self.profilelayer = QgsVectorLayer("LineString", layername, "memory")
self.profileProvider = self.profilelayer.dataProvider()
self.profileProvider.addAttributes(attributes)
self.profilelayer.updateFields()
fields= self.profilelayer.pendingFields()
# add the feature
fet = QgsFeature(fields)
#set geometry
gh = geometryHelper( self.iface )
prjGeom = gh.prjLineFromMapCrs(lineGeom, self.profilelayer.crs() )
fet.setGeometry( prjGeom )
zdata = [n[3] for n in pointData if n[3] > -9999 ]
fet["name"] = profileName
fet['maxZ'] = float( np.max( zdata ) )
fet['meanZ'] = float( np.mean( zdata ) )
fet['minZ'] = float( np.min( zdata ) )
self.profileProvider.addFeatures([ fet ])
self.profilelayer.updateExtents()
if saveToFile and not QgsMapLayerRegistry.instance().mapLayer(self.profilelayerId):
save = self._saveToFile( sender, os.path.join( self.startFolder, layername ))
if save:
fpath, flType = save
error = QgsVectorFileWriter.writeAsVectorFormat(self.profilelayer, fpath, "utf-8", None, flType, )
if error == QgsVectorFileWriter.NoError:
self.profilelayer = QgsVectorLayer( fpath , layername, "ogr")
self.profileProvider = self.profilelayer.dataProvider()
else:
del self.profilelayer, self.profileProvider
return
else:
del self.profilelayer, self.profileProvider
return
# add layer if not already
QgsMapLayerRegistry.instance().addMapLayer(self.profilelayer)
# store layer id and refresh
self.profilelayerId = self.profilelayer.id()
self.iface.mapCanvas().refresh()
def _saveToFile( self, sender, startFolder=None ):
filter = "ESRI Shape Files (*.shp);;SpatiaLite (*.sqlite);;Any File (*.*)" #show only formats with update capabilty
Fdlg = QFileDialog()
Fdlg.setFileMode(QFileDialog.AnyFile)
fName = Fdlg.getSaveFileName( sender, "open file" , filter= filter, directory=startFolder)
if fName:
ext = os.path.splitext( fName )[1]
if "SHP" in ext.upper():
flType = "ESRI Shapefile"
elif "SQLITE" in ext.upper():
flType = "SQLite"
elif "GEOJSON" in ext.upper():#no update possible -> hidden
flType = "GeoJSON"
elif "GML" in ext.upper(): #no update possible -> hidden
flType = "GML"
elif 'TAB' in ext.upper(): #no update possible -> hidden
flType = 'MapInfo File'
elif 'KML' in ext.upper(): #no update possible -> hidden
flType = 'KML'
else:
fName = fName + ".shp"
flType = "ESRI Shapefile"
return (fName , flType )
else:
return None