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189 lines
8.4 KiB
Python
189 lines
8.4 KiB
Python
"""
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***************************************************************************
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TinInterpolation.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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import math
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from qgis.PyQt.QtGui import QIcon
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from qgis.core import (QgsProcessingUtils,
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QgsProcessing,
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QgsProcessingParameterEnum,
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QgsProcessingParameterNumber,
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QgsProcessingParameterExtent,
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QgsProcessingParameterDefinition,
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QgsProcessingParameterRasterDestination,
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QgsWkbTypes,
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QgsProcessingParameterFeatureSink,
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QgsProcessingException,
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QgsCoordinateReferenceSystem)
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from qgis.analysis import (QgsInterpolator,
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QgsTinInterpolator,
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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 TinInterpolation(QgisAlgorithm):
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INTERPOLATION_DATA = 'INTERPOLATION_DATA'
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METHOD = 'METHOD'
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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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TRIANGULATION = 'TRIANGULATION'
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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.METHODS = [self.tr('Linear'),
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self.tr('Clough-Toucher (cubic)')
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]
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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(QgsProcessingParameterEnum(self.METHOD,
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self.tr('Interpolation method'),
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options=self.METHODS,
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defaultValue=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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triangulation_file_param = QgsProcessingParameterFeatureSink(self.TRIANGULATION,
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self.tr('Triangulation'),
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type=QgsProcessing.TypeVectorLine,
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optional=True)
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triangulation_file_param.setCreateByDefault(False)
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self.addParameter(triangulation_file_param)
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def name(self):
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return 'tininterpolation'
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def displayName(self):
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return self.tr('TIN 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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method = self.parameterAsEnum(parameters, self.METHOD, 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(math.ceil(bbox.width() / pixel_size), 1)
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if rows == 0:
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rows = max(math.ceil(bbox.height() / pixel_size), 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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crs = QgsCoordinateReferenceSystem()
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for i, row in enumerate(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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data.transformContext = context.transformContext()
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layers.append(layer)
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if not crs.isValid():
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crs = layer.sourceCrs()
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data.valueSource = int(v[1])
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data.interpolationAttribute = int(v[2])
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if data.valueSource == QgsInterpolator.ValueAttribute and data.interpolationAttribute == -1:
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raise QgsProcessingException(self.tr(
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'Layer {} is set to use a value attribute, but no attribute was set').format(i + 1))
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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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if method == 0:
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interpolationMethod = QgsTinInterpolator.Linear
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else:
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interpolationMethod = QgsTinInterpolator.CloughTocher
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(triangulation_sink, triangulation_dest_id) = self.parameterAsSink(parameters, self.TRIANGULATION, context,
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QgsTinInterpolator.triangulationFields(), QgsWkbTypes.LineString, crs)
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interpolator = QgsTinInterpolator(layerData, interpolationMethod, feedback)
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if triangulation_sink is not None:
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interpolator.setTriangulationSink(triangulation_sink)
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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, self.TRIANGULATION: triangulation_dest_id}
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