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[processing] Add algorithm to strip null geometries

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nyalldawson committed Oct 21, 2016
1 parent 00653d2 commit 374849798e058a0cf0f798882641f4b6f43fd964
@@ -362,6 +362,8 @@ qgis:refactorfields: >

qgis:regularpoints:

qgis:removenullgeometries: >
This algorithms removes any features which do not have a geometry from a vector layer. All other features will be copied unchanged.

qgis:reprojectlayer: >
This algorithm reprojects a vector layer. It creates a new layer with the same features as the input one, but with geometries reprojected to a new CRS.
@@ -150,6 +150,7 @@
from .BoundingBox import BoundingBox
from .Boundary import Boundary
from .PointOnSurface import PointOnSurface
from .RemoveNullGeometry import RemoveNullGeometry

pluginPath = os.path.normpath(os.path.join(
os.path.split(os.path.dirname(__file__))[0], os.pardir))
@@ -202,7 +203,8 @@ def __init__(self):
ReverseLineDirection(), SpatialIndex(), DefineProjection(),
RectanglesOvalsDiamondsVariable(),
RectanglesOvalsDiamondsFixed(), MergeLines(),
BoundingBox(), Boundary(), PointOnSurface()
BoundingBox(), Boundary(), PointOnSurface(),
RemoveNullGeometry()
]

if hasMatplotlib:
@@ -0,0 +1,65 @@
# -*- coding: utf-8 -*-

"""
***************************************************************************
RemoveNullGeometry.py
--------------
Date : October 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__ = 'October 2016'
__copyright__ = '(C) 2016, Nyall Dawson'

# This will get replaced with a git SHA1 when you do a git archive323

__revision__ = '$Format:%H$'

from processing.core.GeoAlgorithm import GeoAlgorithm
from processing.core.parameters import ParameterVector
from processing.core.outputs import OutputVector
from processing.tools import dataobjects, vector


class RemoveNullGeometry(GeoAlgorithm):

INPUT_LAYER = 'INPUT_LAYER'
OUTPUT_LAYER = 'OUTPUT_LAYER'

def defineCharacteristics(self):
self.name, self.i18n_name = self.trAlgorithm('Remove null geometries')
self.group, self.i18n_group = self.trAlgorithm('Vector selection tools')

self.addParameter(ParameterVector(self.INPUT_LAYER,
self.tr('Input layer'), [ParameterVector.VECTOR_TYPE_ANY]))
self.addOutput(OutputVector(self.OUTPUT_LAYER, self.tr('Removed null geometry')))

def processAlgorithm(self, progress):
layer = dataobjects.getObjectFromUri(
self.getParameterValue(self.INPUT_LAYER))
writer = self.getOutputFromName(
self.OUTPUT_LAYER).getVectorWriter(
layer.fields(),
layer.wkbType(),
layer.crs())

features = vector.features(layer)
total = 100.0 / len(features)

for current, input_feature in enumerate(features):
if input_feature.constGeometry():
writer.addFeature(input_feature)

progress.setPercentage(int(current * total))

del writer

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