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72 lines
2.7 KiB
Python
72 lines
2.7 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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EquivalentNumField.py
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---------------------
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Date : January 2013
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Copyright : (C) 2013 by Victor Olaya
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Email : volayaf at gmail dot com
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***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************
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"""
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__author__ = 'Victor Olaya'
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__date__ = 'January 2013'
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__copyright__ = '(C) 2013, Victor Olaya'
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# This will get replaced with a git SHA1 when you do a git archive
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__revision__ = '$Format:%H$'
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import matplotlib.pyplot as plt
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import matplotlib.pylab as lab
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from PyQt4.QtCore import *
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from qgis.core import *
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.parameters import ParameterVector
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from processing.core.parameters import ParameterTableField
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from processing.core.parameters import ParameterNumber
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from processing.core.outputs import OutputHTML
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from processing.tools import *
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class VectorLayerHistogram(GeoAlgorithm):
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INPUT = 'INPUT'
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OUTPUT = 'OUTPUT'
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FIELD = 'FIELD'
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BINS = 'BINS'
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def processAlgorithm(self, progress):
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uri = self.getParameterValue(self.INPUT)
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layer = getObjectFromUri(uri)
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fieldname = self.getParameterValue(self.FIELD)
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output = self.getOutputValue(self.OUTPUT)
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values = vector.getAttributeValues(layer, fieldname)
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plt.close()
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bins = self.getParameterValue(self.BINS)
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plt.hist(values[fieldname], bins)
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plotFilename = output + '.png'
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lab.savefig(plotFilename)
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f = open(output, 'w')
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f.write('<img src="' + plotFilename + '"/>')
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f.close()
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def defineCharacteristics(self):
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self.name = 'Vector layer histogram'
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self.group = 'Graphics'
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self.addParameter(ParameterVector(self.INPUT, 'Input layer',
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[ParameterVector.VECTOR_TYPE_ANY]))
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self.addParameter(ParameterTableField(self.FIELD, 'Attribute',
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self.INPUT, ParameterTableField.DATA_TYPE_NUMBER))
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self.addParameter(ParameterNumber(self.BINS, 'number of bins', 2,
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None, 10))
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self.addOutput(OutputHTML(self.OUTPUT, 'Output'))
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