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197 lines
8.7 KiB
Python
197 lines
8.7 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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contour.py
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---------------------
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Date : September 2013
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Copyright : (C) 2013 by Alexander Bruy
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Email : alexander 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__ = 'September 2013'
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__copyright__ = '(C) 2013, 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 (QgsProcessing,
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QgsProcessingException,
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QgsProcessingParameterDefinition,
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QgsProcessingParameterRasterLayer,
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QgsProcessingParameterBand,
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QgsProcessingParameterString,
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QgsProcessingParameterNumber,
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QgsProcessingParameterBoolean,
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QgsProcessingParameterVectorDestination)
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from processing.algs.gdal.GdalAlgorithm import GdalAlgorithm
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from processing.tools.system import isWindows
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from processing.algs.gdal.GdalUtils import GdalUtils
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class contour(GdalAlgorithm):
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INPUT = 'INPUT'
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BAND = 'BAND'
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INTERVAL = 'INTERVAL'
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FIELD_NAME = 'FIELD_NAME'
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CREATE_3D = 'CREATE_3D'
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IGNORE_NODATA = 'IGNORE_NODATA'
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NODATA = 'NODATA'
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OFFSET = 'OFFSET'
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EXTRA = 'EXTRA'
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OPTIONS = 'OPTIONS'
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OUTPUT = 'OUTPUT'
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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(QgsProcessingParameterRasterLayer(self.INPUT,
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self.tr('Input layer')))
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self.addParameter(QgsProcessingParameterBand(self.BAND,
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self.tr('Band number'),
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1,
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parentLayerParameterName=self.INPUT))
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self.addParameter(QgsProcessingParameterNumber(self.INTERVAL,
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self.tr('Interval between contour lines'),
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type=QgsProcessingParameterNumber.Double,
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minValue=0.0,
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defaultValue=10.0))
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self.addParameter(QgsProcessingParameterString(self.FIELD_NAME,
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self.tr('Attribute name (if not set, no elevation attribute is attached)'),
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defaultValue='ELEV',
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optional=True))
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create_3d_param = QgsProcessingParameterBoolean(self.CREATE_3D,
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self.tr('Produce 3D vector'),
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defaultValue=False)
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create_3d_param.setFlags(create_3d_param.flags() | QgsProcessingParameterDefinition.FlagAdvanced)
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self.addParameter(create_3d_param)
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ignore_nodata_param = QgsProcessingParameterBoolean(self.IGNORE_NODATA,
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self.tr('Treat all raster values as valid'),
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defaultValue=False)
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ignore_nodata_param.setFlags(ignore_nodata_param.flags() | QgsProcessingParameterDefinition.FlagAdvanced)
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self.addParameter(ignore_nodata_param)
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nodata_param = QgsProcessingParameterNumber(self.NODATA,
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self.tr('Input pixel value to treat as "nodata"'),
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type=QgsProcessingParameterNumber.Double,
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defaultValue=None,
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optional=True)
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nodata_param.setFlags(nodata_param.flags() | QgsProcessingParameterDefinition.FlagAdvanced)
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self.addParameter(nodata_param)
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offset_param = QgsProcessingParameterNumber(self.OFFSET,
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self.tr('Offset from zero relative to which to interpret intervals'),
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type=QgsProcessingParameterNumber.Double,
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defaultValue=0.0,
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optional=True)
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nodata_param.setFlags(offset_param.flags() | QgsProcessingParameterDefinition.FlagAdvanced)
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self.addParameter(offset_param)
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extra_param = QgsProcessingParameterString(self.EXTRA,
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self.tr('Additional command-line parameters'),
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defaultValue=None,
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optional=True)
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extra_param.setFlags(extra_param.flags() | QgsProcessingParameterDefinition.FlagAdvanced)
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self.addParameter(extra_param)
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# TODO: remove in QGIS 4
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options_param = QgsProcessingParameterString(self.OPTIONS,
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self.tr('Additional creation options'),
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defaultValue='',
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optional=True)
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options_param.setFlags(options_param.flags() | QgsProcessingParameterDefinition.FlagHidden)
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self.addParameter(options_param)
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self.addParameter(QgsProcessingParameterVectorDestination(
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self.OUTPUT, self.tr('Contours'), QgsProcessing.TypeVectorLine))
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def name(self):
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return 'contour'
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def displayName(self):
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return self.tr('Contour')
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def icon(self):
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return QIcon(os.path.join(pluginPath, 'images', 'gdaltools', 'contour.png'))
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def group(self):
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return self.tr('Raster extraction')
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def groupId(self):
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return 'rasterextraction'
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def commandName(self):
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return 'gdal_contour'
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def getConsoleCommands(self, parameters, context, feedback, executing=True):
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inLayer = self.parameterAsRasterLayer(parameters, self.INPUT, context)
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if inLayer is None:
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raise QgsProcessingException(self.invalidRasterError(parameters, self.INPUT))
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fieldName = self.parameterAsString(parameters, self.FIELD_NAME, context)
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if self.NODATA in parameters and parameters[self.NODATA] is not None:
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nodata = self.parameterAsDouble(parameters, self.NODATA, context)
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else:
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nodata = None
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offset = self.parameterAsDouble(parameters, self.OFFSET, context)
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outFile = self.parameterAsOutputLayer(parameters, self.OUTPUT, context)
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self.setOutputValue(self.OUTPUT, outFile)
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output, outFormat = GdalUtils.ogrConnectionStringAndFormat(outFile, context)
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arguments = []
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arguments.append('-b')
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arguments.append(str(self.parameterAsInt(parameters, self.BAND, context)))
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if fieldName:
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arguments.append('-a')
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arguments.append(fieldName)
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arguments.append('-i')
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arguments.append(str(self.parameterAsDouble(parameters, self.INTERVAL, context)))
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if self.parameterAsBoolean(parameters, self.CREATE_3D, context):
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arguments.append('-3d')
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if self.parameterAsBoolean(parameters, self.IGNORE_NODATA, context):
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arguments.append('-inodata')
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if nodata is not None:
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arguments.append('-snodata {}'.format(nodata))
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if offset:
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arguments.append('-off {}'.format(offset))
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if outFormat:
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arguments.append('-f {}'.format(outFormat))
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if self.EXTRA in parameters and parameters[self.EXTRA] not in (None, ''):
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extra = self.parameterAsString(parameters, self.EXTRA, context)
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arguments.append(extra)
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# TODO: remove in QGIS 4
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options = self.parameterAsString(parameters, self.OPTIONS, context)
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if options:
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arguments.append(options)
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arguments.append(inLayer.source())
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arguments.append(output)
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return [self.commandName(), GdalUtils.escapeAndJoin(arguments)]
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