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Boundary.py
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Boundary.py
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# -*- coding: utf-8 -*-
"""
***************************************************************************
Boundary.py
--------------
Date : July 2016
Copyright : (C) 2016 by Nyall Dawson
Email : nyall dot dawson at gmail dot com
***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************
"""
__author__ = 'Nyall Dawson'
__date__ = 'July 2016'
__copyright__ = '(C) 2016, Nyall Dawson'
# This will get replaced with a git SHA1 when you do a git archive323
__revision__ = '$Format:%H$'
import os
from qgis.core import (QgsGeometry,
QgsWkbTypes,
QgsProcessingUtils,
QgsProcessingParameterDefinition,
QgsProcessingParameterFeatureSource,
QgsProcessingParameterFeatureSink,
QgsProcessingOutputVectorLayer)
from qgis.PyQt.QtGui import QIcon
from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
from processing.core.parameters import ParameterVector
from processing.core.outputs import OutputVector
from processing.tools import dataobjects
pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
class Boundary(QgisAlgorithm):
INPUT_LAYER = 'INPUT_LAYER'
OUTPUT_LAYER = 'OUTPUT_LAYER'
def __init__(self):
super().__init__()
self.addParameter(QgsProcessingParameterFeatureSource(self.INPUT_LAYER, self.tr('Input layer'), [QgsProcessingParameterDefinition.TypeVectorLine, QgsProcessingParameterDefinition.TypeVectorPolygon]))
self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT_LAYER, self.tr('Boundary')))
self.addOutput(QgsProcessingOutputVectorLayer(self.OUTPUT_LAYER, self.tr("Boundaries")))
def icon(self):
return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'convex_hull.png'))
def group(self):
return self.tr('Vector geometry tools')
def name(self):
return 'boundary'
def displayName(self):
return self.tr('Boundary')
def processAlgorithm(self, parameters, context, feedback):
layer = self.parameterAsLayer(parameters, self.INPUT_LAYER, context)
input_wkb = layer.wkbType()
if QgsWkbTypes.geometryType(input_wkb) == QgsWkbTypes.LineGeometry:
output_wkb = QgsWkbTypes.MultiPoint
elif QgsWkbTypes.geometryType(input_wkb) == QgsWkbTypes.PolygonGeometry:
output_wkb = QgsWkbTypes.MultiLineString
if QgsWkbTypes.hasZ(input_wkb):
output_wkb = QgsWkbTypes.addZ(output_wkb)
if QgsWkbTypes.hasM(input_wkb):
output_wkb = QgsWkbTypes.addM(output_wkb)
(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT_LAYER, context, '',
layer.fields(), output_wkb, layer.crs())
features = QgsProcessingUtils.getFeatures(layer, context)
total = 100.0 / QgsProcessingUtils.featureCount(layer, context)
for current, input_feature in enumerate(features):
if feedback.isCanceled():
break
output_feature = input_feature
input_geometry = input_feature.geometry()
if input_geometry:
output_geometry = QgsGeometry(input_geometry.geometry().boundary())
if not output_geometry:
raise GeoAlgorithmExecutionException(
self.tr('Error calculating boundary'))
output_feature.setGeometry(output_geometry)
sink.addFeature(output_feature)
feedback.setProgress(int(current * total))
return {self.OUTPUT_LAYER: dest_id}