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Algorithms and other processing code should use this method (instead of dataobjects.getLayerFromString) to retrieve layers from a string, as it considers the processing context and allows resolving strings to temporarily stored layers. This permits processing models to function correctly when intermediate results are stored as memory layers. Subsequent model algorithms can then access these temporary layers as inputs. All temporary layers will be removed when the context object is destroyed after the model algorithm is run.
84 lines
3.1 KiB
Python
84 lines
3.1 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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BarPlot.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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import numpy as np
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from qgis.core import (QgsApplication)
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.parameters import ParameterTable
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from processing.core.parameters import ParameterTableField
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from processing.core.outputs import OutputHTML
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from processing.tools import dataobjects, vector
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class PolarPlot(GeoAlgorithm):
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INPUT = 'INPUT'
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OUTPUT = 'OUTPUT'
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NAME_FIELD = 'NAME_FIELD'
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VALUE_FIELD = 'VALUE_FIELD'
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def icon(self):
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return QgsApplication.getThemeIcon("/providerQgis.svg")
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def svgIconPath(self):
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return QgsApplication.iconPath("providerQgis.svg")
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def group(self):
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return self.tr('Graphics')
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def name(self):
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return 'polarplot'
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def displayName(self):
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return self.tr('Polar plot')
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def defineCharacteristics(self):
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self.addParameter(ParameterTable(self.INPUT,
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self.tr('Input table')))
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self.addParameter(ParameterTableField(self.NAME_FIELD,
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self.tr('Category name field'), self.INPUT)) # FIXME unused?
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self.addParameter(ParameterTableField(self.VALUE_FIELD,
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self.tr('Value field'), self.INPUT))
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self.addOutput(OutputHTML(self.OUTPUT, self.tr('Polar plot')))
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def processAlgorithm(self, context, feedback):
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layer = dataobjects.QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.INPUT), context)
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namefieldname = self.getParameterValue(self.NAME_FIELD) # NOQA FIXME unused?
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valuefieldname = self.getParameterValue(self.VALUE_FIELD)
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output = self.getOutputValue(self.OUTPUT)
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values = vector.values(layer, context, valuefieldname)
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data = [go.Area(r=values[valuefieldname],
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t=np.degrees(np.arange(0.0, 2 * np.pi, 2 * np.pi / len(values[valuefieldname]))))]
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plt.offline.plot(data, filename=output, auto_open=False)
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