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refactor Text to float alg

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alexbruy committed Oct 2, 2014
1 parent 07d584d commit 5306cd856695b45fe48546ffab8d797af3cb52f5
@@ -75,6 +75,7 @@

from mmqgisx.DeleteColumn import DeleteColumn
from mmqgisx.DeleteDuplicateGeometries import DeleteDuplicateGeometries
from mmqgisx.TextToFloat import TextToFloat

from ConcaveHull import ConcaveHull
from Polygonize import Polygonize
@@ -140,6 +141,7 @@ def __init__(self):
SpatialJoin(),
# ------ mmqgisx ------
DeleteColumn(), DeleteDuplicateGeometries(),
TextToFloat(),
#mmqgisx_delete_duplicate_geometries_algorithm(),
#mmqgisx_geometry_convert_algorithm(),
#mmqgisx_grid_algorithm(),
@@ -0,0 +1,82 @@
# -*- coding: utf-8 -*-

"""
***************************************************************************
DeleteColumn.py
---------------------
Date : May 2010
Copyright : (C) 2010 by Michael Minn
Email : pyqgis at michaelminn 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__ = 'Michael Minn'
__date__ = 'May 2010'
__copyright__ = '(C) 2010, Michael Minn'

# This will get replaced with a git SHA1 when you do a git archive

__revision__ = '$Format:%H$'

from PyQt4.QtCore import *
from qgis.core import *
from processing.core.GeoAlgorithm import GeoAlgorithm
from processing.core.parameters import ParameterVector
from processing.core.parameters import ParameterTableField
from processing.core.outputs import OutputVector
from processing.tools import dataobjects, vector


class TextToFloat(GeoAlgorithm):
INPUT = 'INPUT'
FIELD = 'FIELD'
OUTPUT = 'OUTPUT'

def defineCharacteristics(self):
self.name = 'Text to float'
self.group = 'Vector table tools'

self.addParameter(ParameterVector(
self.INPUT, 'Input Layer', [ParameterVector.VECTOR_TYPE_ANY]))
self.addParameter(ParameterTableField(
self.FIELD, 'Text attribute to convert to float', self.INPUT,
ParameterTableField.DATA_TYPE_STRING))
self.addOutput(OutputVector(self.OUTPUT, 'Output'))

def processAlgorithm(self, progress):
layer = dataobjects.getObjectFromUri(
self.getParameterValue(self.INPUT))
fieldName = self.getParameterValue(self.FIELD)
idx = layer.fieldNameIndex(fieldName)

fields = layer.pendingFields()
fields[idx] = QgsField(fieldName, QVariant.Double, '', 24, 15)

writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(fields,
layer.wkbType(), layer.crs())

features = vector.features(layer)

count = len(features)
total = 100.0 / float(count)
for count, f in enumerate(features):
value = f[idx]
try:
if '%' in value:
f[idx] = float(value.replace('%', '')) / 100.0
else:
f[idx] = float(value)
except:
f[idx] = None

writer.addFeature(f)
progress.setPercentage(int(count * total))

del writer

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