QGIS/python/plugins/processing/algs/qgis/PointsLayerFromTable.py

94 lines
3.6 KiB
Python

# -*- coding: utf-8 -*-
"""
***************************************************************************
PointsLayerFromTable.py
---------------------
Date : January 2013
Copyright : (C) 2013 by Victor Olaya
Email : volayaf at gmail dot 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. *
* *
***************************************************************************
"""
__author__ = 'Victor Olaya'
__date__ = 'August 2013'
__copyright__ = '(C) 2013, Victor Olaya'
# This will get replaced with a git SHA1 when you do a git archive
__revision__ = '$Format:%H$'
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from qgis.core import *
from processing.core.GeoAlgorithm import GeoAlgorithm
from processing.parameters.ParameterTable import ParameterTable
from processing.parameters.ParameterTableField import ParameterTableField
from processing.parameters.ParameterCrs import ParameterCrs
from processing.outputs.OutputVector import OutputVector
from processing.tools import dataobjects, vector
class PointsLayerFromTable(GeoAlgorithm):
INPUT = 'INPUT'
XFIELD = 'XFIELD'
YFIELD = 'YFIELD'
OUTPUT = 'OUTPUT'
TARGET_CRS = 'TARGET_CRS'
def processAlgorithm(self, progress):
source = self.getParameterValue(self.INPUT)
vlayer = dataobjects.getObjectFromUri(source)
output = self.getOutputFromName(self.OUTPUT)
vprovider = vlayer.dataProvider()
fields = vprovider.fields()
writer = output.getVectorWriter(fields, QGis.WKBPoint, self.crs)
xfieldindex = vlayer.fieldNameIndex(
self.getParameterValue(self.XFIELD))
yfieldindex = vlayer.fieldNameIndex(
self.getParameterValue(self.YFIELD))
crsId = self.getParameterValue(self.TARGET_CRS)
targetCrs = QgsCoordinateReferenceSystem(crsId)
self.crs = targetCrs
outFeat = QgsFeature()
nElement = 0
features = vector.features(vlayer)
nFeat = len(features)
for feature in features:
nElement += 1
progress.setPercentage(nElement * 100 / nFeat)
attrs = feature.attributes()
try:
x = float(attrs[xfieldindex])
y = float(attrs[yfieldindex])
except:
continue
pt = QgsPoint(x, y)
outFeat.setGeometry(QgsGeometry.fromPoint(pt))
outFeat.setAttributes(attrs)
writer.addFeature(outFeat)
del writer
def defineCharacteristics(self):
self.name = 'Points layer from table'
self.group = 'Vector creation tools'
self.addParameter(ParameterTable(self.INPUT, 'Input layer'))
self.addParameter(ParameterTableField(self.XFIELD, 'X field',
self.INPUT, ParameterTableField.DATA_TYPE_ANY))
self.addParameter(ParameterTableField(self.YFIELD, 'Y field',
self.INPUT, ParameterTableField.DATA_TYPE_ANY))
self.addParameter(ParameterCrs(self.TARGET_CRS, 'Target CRS',
'EPSG:4326'))
self.addOutput(OutputVector(self.OUTPUT, 'Output layer'))