mirror of
https://github.com/qgis/QGIS.git
synced 2025-03-03 00:02:25 -05:00
104 lines
3.7 KiB
Python
104 lines
3.7 KiB
Python
# -*- 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
|
|
|
|
from qgis.PyQt.QtGui import QIcon
|
|
|
|
from processing.core.GeoAlgorithm import GeoAlgorithm
|
|
from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
|
|
from processing.core.parameters import ParameterVector
|
|
from processing.core.outputs import OutputVector
|
|
from processing.tools import dataobjects, vector
|
|
|
|
pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
|
|
|
|
|
|
class Boundary(GeoAlgorithm):
|
|
|
|
INPUT_LAYER = 'INPUT_LAYER'
|
|
OUTPUT_LAYER = 'OUTPUT_LAYER'
|
|
|
|
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 defineCharacteristics(self):
|
|
self.addParameter(ParameterVector(self.INPUT_LAYER,
|
|
self.tr('Input layer'), [dataobjects.TYPE_VECTOR_LINE,
|
|
dataobjects.TYPE_VECTOR_POLYGON]))
|
|
self.addOutput(OutputVector(self.OUTPUT_LAYER, self.tr('Boundary')))
|
|
|
|
def processAlgorithm(self, feedback):
|
|
layer = dataobjects.getObjectFromUri(
|
|
self.getParameterValue(self.INPUT_LAYER))
|
|
|
|
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)
|
|
|
|
writer = self.getOutputFromName(
|
|
self.OUTPUT_LAYER).getVectorWriter(
|
|
layer.fields(),
|
|
output_wkb,
|
|
layer.crs())
|
|
|
|
features = vector.features(layer)
|
|
total = 100.0 / len(features)
|
|
|
|
for current, input_feature in enumerate(features):
|
|
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)
|
|
|
|
writer.addFeature(output_feature)
|
|
feedback.setProgress(int(current * total))
|
|
|
|
del writer
|