mirror of
https://github.com/qgis/QGIS.git
synced 2025-02-28 00:17:30 -05:00
235 lines
9.5 KiB
Python
235 lines
9.5 KiB
Python
# -*- coding: utf-8 -*-
|
|
|
|
"""
|
|
***************************************************************************
|
|
Gridify.py
|
|
---------------------
|
|
Date : May 2010
|
|
Copyright : (C) 2010 by Michael Minn
|
|
Email : pyqgis at michaelminn 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__ = 'Michael Minn'
|
|
__date__ = 'May 2010'
|
|
__copyright__ = '(C) 2010, Michael Minn'
|
|
|
|
# This will get replaced with a git SHA1 when you do a git archive
|
|
|
|
__revision__ = '$Format:%H$'
|
|
|
|
from qgis.core import (QgsFeature,
|
|
QgsGeometry,
|
|
QgsMultiPoint,
|
|
QgsMultiLineString,
|
|
QgsLineString,
|
|
QgsPolygon,
|
|
QgsFeatureSink,
|
|
QgsWkbTypes,
|
|
QgsProcessingException,
|
|
QgsProcessingParameterFeatureSource,
|
|
QgsProcessingParameterEnum,
|
|
QgsProcessingParameterFeatureSink)
|
|
from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
|
|
|
|
|
|
class GeometryConvert(QgisAlgorithm):
|
|
INPUT = 'INPUT'
|
|
TYPE = 'TYPE'
|
|
OUTPUT = 'OUTPUT'
|
|
|
|
def group(self):
|
|
return self.tr('Vector geometry')
|
|
|
|
def __init__(self):
|
|
super().__init__()
|
|
|
|
def initAlgorithm(self, config=None):
|
|
self.types = [self.tr('Centroids'),
|
|
self.tr('Nodes'),
|
|
self.tr('Linestrings'),
|
|
self.tr('Multilinestrings'),
|
|
self.tr('Polygons')]
|
|
|
|
self.addParameter(QgsProcessingParameterFeatureSource(self.INPUT,
|
|
self.tr('Input layer')))
|
|
self.addParameter(QgsProcessingParameterEnum(self.TYPE,
|
|
self.tr('New geometry type'), options=self.types))
|
|
|
|
self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT,
|
|
self.tr('Converted')))
|
|
|
|
def name(self):
|
|
return 'convertgeometrytype'
|
|
|
|
def displayName(self):
|
|
return self.tr('Convert geometry type')
|
|
|
|
def processAlgorithm(self, parameters, context, feedback):
|
|
source = self.parameterAsSource(parameters, self.INPUT, context)
|
|
index = self.parameterAsEnum(parameters, self.TYPE, context)
|
|
|
|
if index == 0:
|
|
newType = QgsWkbTypes.Point
|
|
elif index == 1:
|
|
newType = QgsWkbTypes.Point
|
|
if QgsWkbTypes.hasM(source.wkbType()):
|
|
newType = QgsWkbTypes.addM(newType)
|
|
if QgsWkbTypes.hasZ(source.wkbType()):
|
|
newType = QgsWkbTypes.addZ(newType)
|
|
elif index == 2:
|
|
newType = QgsWkbTypes.LineString
|
|
if QgsWkbTypes.hasM(source.wkbType()):
|
|
newType = QgsWkbTypes.addM(newType)
|
|
if QgsWkbTypes.hasZ(source.wkbType()):
|
|
newType = QgsWkbTypes.addZ(newType)
|
|
elif index == 3:
|
|
newType = QgsWkbTypes.MultiLineString
|
|
if QgsWkbTypes.hasM(source.wkbType()):
|
|
newType = QgsWkbTypes.addM(newType)
|
|
if QgsWkbTypes.hasZ(source.wkbType()):
|
|
newType = QgsWkbTypes.addZ(newType)
|
|
else:
|
|
newType = QgsWkbTypes.Polygon
|
|
if QgsWkbTypes.hasM(source.wkbType()):
|
|
newType = QgsWkbTypes.addM(newType)
|
|
if QgsWkbTypes.hasZ(source.wkbType()):
|
|
newType = QgsWkbTypes.addZ(newType)
|
|
|
|
(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
|
|
source.fields(), newType, source.sourceCrs())
|
|
|
|
features = source.getFeatures()
|
|
total = 100.0 / source.featureCount() if source.featureCount() else 0
|
|
|
|
for current, f in enumerate(features):
|
|
if feedback.isCanceled():
|
|
break
|
|
|
|
if not f.hasGeometry():
|
|
sink.addFeature(f, QgsFeatureSink.FastInsert)
|
|
else:
|
|
for p in self.convertGeometry(f.geometry(), index):
|
|
feat = QgsFeature()
|
|
feat.setAttributes(f.attributes())
|
|
feat.setGeometry(p)
|
|
sink.addFeature(feat, QgsFeatureSink.FastInsert)
|
|
|
|
feedback.setProgress(int(current * total))
|
|
|
|
return {self.OUTPUT: dest_id}
|
|
|
|
def convertGeometry(self, geom, target_type):
|
|
# returns an array of output geometries for the input geometry
|
|
if target_type == 0:
|
|
#centroid
|
|
return self.convertToCentroid(geom)
|
|
elif target_type == 1:
|
|
#nodes
|
|
return self.convertToNodes(geom)
|
|
elif target_type == 2:
|
|
#linestrings
|
|
return self.convertToLineStrings(geom)
|
|
elif target_type == 3:
|
|
#multilinestrings
|
|
return self.convertToMultiLineStrings(geom)
|
|
elif target_type == 4:
|
|
#polygon
|
|
return self.convertToPolygon(geom)
|
|
|
|
def convertToCentroid(self, geom):
|
|
return [geom.centroid()]
|
|
|
|
def convertToNodes(self, geom):
|
|
mp = QgsMultiPoint()
|
|
# TODO: mega inefficient - needs rework when geometry iterators land
|
|
# (but at least it doesn't lose Z/M values)
|
|
for g in geom.constGet().coordinateSequence():
|
|
for r in g:
|
|
for p in r:
|
|
mp.addGeometry(p)
|
|
return [QgsGeometry(mp)]
|
|
|
|
def convertToLineStrings(self, geom):
|
|
if QgsWkbTypes.geometryType(geom.wkbType()) == QgsWkbTypes.PointGeometry:
|
|
raise QgsProcessingException(
|
|
self.tr('Cannot convert from {0} to LineStrings').format(QgsWkbTypes.displayString(geom.wkbType())))
|
|
elif QgsWkbTypes.geometryType(geom.wkbType()) == QgsWkbTypes.LineGeometry:
|
|
if QgsWkbTypes.isMultiType(geom.wkbType()):
|
|
return geom.asGeometryCollection()
|
|
else:
|
|
#line to line
|
|
return [geom]
|
|
else:
|
|
# polygons to lines
|
|
# we just use the boundary here - that consists of all rings in the (multi)polygon
|
|
boundary = QgsGeometry(geom.constGet().boundary())
|
|
# boundary will be multipart
|
|
return boundary.asGeometryCollection()
|
|
|
|
def convertToMultiLineStrings(self, geom):
|
|
if QgsWkbTypes.geometryType(geom.wkbType()) == QgsWkbTypes.PointGeometry:
|
|
raise QgsProcessingException(
|
|
self.tr('Cannot convert from {0} to MultiLineStrings').format(QgsWkbTypes.displayString(geom.wkbType())))
|
|
elif QgsWkbTypes.geometryType(geom.wkbType()) == QgsWkbTypes.LineGeometry:
|
|
if QgsWkbTypes.isMultiType(geom.wkbType()):
|
|
return [geom]
|
|
else:
|
|
# line to multiLine
|
|
ml = QgsMultiLineString()
|
|
ml.addGeometry(geom.constGet().clone())
|
|
return [QgsGeometry(ml)]
|
|
else:
|
|
# polygons to multilinestring
|
|
# we just use the boundary here - that consists of all rings in the (multi)polygon
|
|
return [QgsGeometry(geom.constGet().boundary())]
|
|
|
|
def convertToPolygon(self, geom):
|
|
if QgsWkbTypes.geometryType(geom.wkbType()) == QgsWkbTypes.PointGeometry and geom.constGet().nCoordinates() < 3:
|
|
raise QgsProcessingException(
|
|
self.tr('Cannot convert from Point to Polygon').format(QgsWkbTypes.displayString(geom.wkbType())))
|
|
elif QgsWkbTypes.geometryType(geom.wkbType()) == QgsWkbTypes.PointGeometry:
|
|
# multipoint with at least 3 points
|
|
# TODO: mega inefficient - needs rework when geometry iterators land
|
|
# (but at least it doesn't lose Z/M values)
|
|
points = []
|
|
for g in geom.constGet().coordinateSequence():
|
|
for r in g:
|
|
for p in r:
|
|
points.append(p)
|
|
linestring = QgsLineString(points)
|
|
linestring.close()
|
|
p = QgsPolygon()
|
|
p.setExteriorRing(linestring)
|
|
return [QgsGeometry(p)]
|
|
elif QgsWkbTypes.geometryType(geom.wkbType()) == QgsWkbTypes.LineGeometry:
|
|
if QgsWkbTypes.isMultiType(geom):
|
|
parts = []
|
|
for i in range(geom.constGet().numGeometries()):
|
|
p = QgsPolygon()
|
|
linestring = geom.constGet().geometryN(i).clone()
|
|
linestring.close()
|
|
p.setExteriorRing(linestring)
|
|
parts.append(QgsGeometry(p))
|
|
return QgsGeometry.collectGeometry(parts)
|
|
else:
|
|
# linestring to polygon
|
|
p = QgsPolygon()
|
|
linestring = geom.constGet().clone()
|
|
linestring.close()
|
|
p.setExteriorRing(linestring)
|
|
return [QgsGeometry(p)]
|
|
else:
|
|
#polygon
|
|
if QgsWkbTypes.isMultiType(geom):
|
|
return geom.asGeometryCollection()
|
|
else:
|
|
return [geom]
|