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b1cadb1822
have specific icons, instead of generic qgis icon We consider these 'top level' algorithms, and using the standard algorithm icon should help reflect this and differentiate them from 3rd party algorithms.
82 lines
3.0 KiB
Python
82 lines
3.0 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 plotly as plt
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import plotly.graph_objs as go
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from qgis.core import (QgsApplication,
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QgsFeatureSink,
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QgsProcessingUtils)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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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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class VectorLayerHistogram(QgisAlgorithm):
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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 group(self):
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return self.tr('Graphics')
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def __init__(self):
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super().__init__()
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self.addParameter(ParameterVector(self.INPUT,
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self.tr('Input layer')))
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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 name(self):
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return 'vectorlayerhistogram'
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def displayName(self):
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return self.tr('Vector layer histogram')
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def processAlgorithm(self, parameters, context, feedback):
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layer = QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.INPUT), context)
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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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data = [go.Histogram(x=values[fieldname],
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nbinsx=bins)]
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plt.offline.plot(data, filename=output, auto_open=False)
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