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77 lines
2.9 KiB
Python
77 lines
2.9 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 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 vector
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from processing.tools import dataobjects
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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 defineCharacteristics(self):
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self.name, self.i18n_name = self.trAlgorithm('Vector layer histogram')
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self.group, self.i18n_group = self.trAlgorithm('Graphics')
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self.addParameter(ParameterVector(self.INPUT,
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self.tr('Input layer'), [ParameterVector.VECTOR_TYPE_ANY]))
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self.addParameter(ParameterTableField(self.FIELD,
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self.tr('Attribute'), self.INPUT,
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ParameterTableField.DATA_TYPE_NUMBER))
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self.addParameter(ParameterNumber(self.BINS,
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self.tr('number of bins'), 2, None, 10))
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self.addOutput(OutputHTML(self.OUTPUT, self.tr('Histogram')))
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def processAlgorithm(self, progress):
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layer = dataobjects.getObjectFromUri(
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self.getParameterValue(self.INPUT))
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fieldname = self.getParameterValue(self.FIELD)
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bins = self.getParameterValue(self.BINS)
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output = self.getOutputValue(self.OUTPUT)
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values = vector.values(layer, fieldname)
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plt.close()
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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('<html><img src="' + plotFilename + '"/></html>')
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f.close()
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