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2628c480c5
Prevent changes to files that weren't changed between releases. This eases review of the changes between releases significantly.
158 lines
6.7 KiB
Python
158 lines
6.7 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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IdwInterpolation.py
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---------------------
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Date : October 2016
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Copyright : (C) 2016 by Alexander Bruy
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Email : alexander dot bruy 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__ = 'Alexander Bruy'
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__date__ = 'October 2016'
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__copyright__ = '(C) 2016, Alexander Bruy'
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import os
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from qgis.PyQt.QtGui import QIcon
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from qgis.core import (QgsRectangle,
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QgsProcessingUtils,
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QgsProcessingParameterNumber,
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QgsProcessingParameterExtent,
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QgsProcessingParameterDefinition,
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QgsProcessingParameterRasterDestination,
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QgsProcessingException)
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from qgis.analysis import (QgsInterpolator,
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QgsIDWInterpolator,
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QgsGridFileWriter)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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from processing.algs.qgis.ui.InterpolationWidgets import ParameterInterpolationData, ParameterPixelSize
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class IdwInterpolation(QgisAlgorithm):
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INTERPOLATION_DATA = 'INTERPOLATION_DATA'
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DISTANCE_COEFFICIENT = 'DISTANCE_COEFFICIENT'
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PIXEL_SIZE = 'PIXEL_SIZE'
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COLUMNS = 'COLUMNS'
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ROWS = 'ROWS'
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EXTENT = 'EXTENT'
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OUTPUT = 'OUTPUT'
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def icon(self):
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return QIcon(os.path.join(pluginPath, 'images', 'interpolation.png'))
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def group(self):
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return self.tr('Interpolation')
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def groupId(self):
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return 'interpolation'
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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(ParameterInterpolationData(self.INTERPOLATION_DATA,
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self.tr('Input layer(s)')))
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self.addParameter(QgsProcessingParameterNumber(self.DISTANCE_COEFFICIENT,
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self.tr('Distance coefficient P'), type=QgsProcessingParameterNumber.Double,
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minValue=0.0, maxValue=99.99, defaultValue=2.0))
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self.addParameter(QgsProcessingParameterExtent(self.EXTENT,
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self.tr('Extent'),
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optional=False))
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pixel_size_param = ParameterPixelSize(self.PIXEL_SIZE,
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self.tr('Output raster size'),
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layersData=self.INTERPOLATION_DATA,
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extent=self.EXTENT,
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minValue=0.0,
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default=0.1)
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self.addParameter(pixel_size_param)
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cols_param = QgsProcessingParameterNumber(self.COLUMNS,
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self.tr('Number of columns'),
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optional=True,
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minValue=0, maxValue=10000000)
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cols_param.setFlags(cols_param.flags() | QgsProcessingParameterDefinition.FlagHidden)
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self.addParameter(cols_param)
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rows_param = QgsProcessingParameterNumber(self.ROWS,
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self.tr('Number of rows'),
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optional=True,
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minValue=0, maxValue=10000000)
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rows_param.setFlags(rows_param.flags() | QgsProcessingParameterDefinition.FlagHidden)
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self.addParameter(rows_param)
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self.addParameter(QgsProcessingParameterRasterDestination(self.OUTPUT,
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self.tr('Interpolated')))
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def name(self):
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return 'idwinterpolation'
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def displayName(self):
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return self.tr('IDW interpolation')
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def processAlgorithm(self, parameters, context, feedback):
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interpolationData = ParameterInterpolationData.parseValue(parameters[self.INTERPOLATION_DATA])
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coefficient = self.parameterAsDouble(parameters, self.DISTANCE_COEFFICIENT, context)
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bbox = self.parameterAsExtent(parameters, self.EXTENT, context)
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pixel_size = self.parameterAsDouble(parameters, self.PIXEL_SIZE, context)
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output = self.parameterAsOutputLayer(parameters, self.OUTPUT, context)
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columns = self.parameterAsInt(parameters, self.COLUMNS, context)
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rows = self.parameterAsInt(parameters, self.ROWS, context)
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if columns == 0:
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columns = max(round(bbox.width() / pixel_size) + 1, 1)
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if rows == 0:
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rows = max(round(bbox.height() / pixel_size) + 1, 1)
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if interpolationData is None:
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raise QgsProcessingException(
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self.tr('You need to specify at least one input layer.'))
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layerData = []
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layers = []
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for row in interpolationData.split('::|::'):
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v = row.split('::~::')
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data = QgsInterpolator.LayerData()
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# need to keep a reference until interpolation is complete
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layer = QgsProcessingUtils.variantToSource(v[0], context)
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data.source = layer
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layers.append(layer)
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data.valueSource = int(v[1])
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data.interpolationAttribute = int(v[2])
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if v[3] == '0':
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data.sourceType = QgsInterpolator.SourcePoints
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elif v[3] == '1':
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data.sourceType = QgsInterpolator.SourceStructureLines
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else:
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data.sourceType = QgsInterpolator.SourceBreakLines
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layerData.append(data)
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interpolator = QgsIDWInterpolator(layerData)
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interpolator.setDistanceCoefficient(coefficient)
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writer = QgsGridFileWriter(interpolator,
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output,
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bbox,
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columns,
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rows)
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writer.writeFile(feedback)
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return {self.OUTPUT: output}
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