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5339d62715
Include descriptive text with the specified parameter value in error, and always check that sources were loaded to avoid raw Python exceptions when they are not
90 lines
3.4 KiB
Python
90 lines
3.4 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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VectorLayerHistogram.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 (QgsProcessingException,
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QgsProcessingParameterFeatureSource,
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QgsProcessingParameterField,
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QgsProcessingParameterNumber,
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QgsProcessingParameterFileDestination)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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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 groupId(self):
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return 'graphics'
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def __init__(self):
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super().__init__()
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def initAlgorithm(self, config=None):
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self.addParameter(QgsProcessingParameterFeatureSource(self.INPUT,
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self.tr('Input layer')))
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self.addParameter(QgsProcessingParameterField(self.FIELD,
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self.tr('Attribute'), parentLayerParameterName=self.INPUT,
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type=QgsProcessingParameterField.Numeric))
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self.addParameter(QgsProcessingParameterNumber(self.BINS,
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self.tr('number of bins'), minValue=2, defaultValue=10))
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self.addParameter(QgsProcessingParameterFileDestination(self.OUTPUT, self.tr('Histogram'), self.tr('HTML files (*.html)')))
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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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source = self.parameterAsSource(parameters, self.INPUT, context)
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if source is None:
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raise QgsProcessingException(self.invalidSourceError(parameters, self.INPUT))
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fieldname = self.parameterAsString(parameters, self.FIELD, context)
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bins = self.parameterAsInt(parameters, self.BINS, context)
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output = self.parameterAsFileOutput(parameters, self.OUTPUT, context)
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values = vector.values(source, 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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return {self.OUTPUT: output}
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