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nyalldawsonnyalldawson
committedAug 14, 2016
[FEATURE][processing] New algorithm for translating (moving) points
Allows geometries to be shifted by a x/y displacement
·
ltr-3_40final-3_0_0
1 parent a064c0a commit 0f268bf

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6 files changed

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6 files changed

+175
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‎python/plugins/processing/algs/help/qgis.yaml

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@@ -452,6 +452,9 @@ qgis:symmetricaldifference: >
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qgis:texttofloat: >
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This algorithm modifies the type of a given attribute in a vector layer, converting a text attribute containing numeric strings into a numeric attribute.
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qgis:translate: >
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This algorithm moves the geometries within a layer, by offsetting them with a specified x and y displacement.
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qgis:union: >
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This algorithm creates a layer containing all the features from both input layers. In the case of polygon layers, separate features are created for overlapping and non-overlapping features. The attribute table of the union layer contains attribute values from the respective input layer for non-overlapping features, and attribute values from both input layers for overlapping features.
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‎python/plugins/processing/algs/qgis/QGISAlgorithmProvider.py

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@@ -152,6 +152,7 @@
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from .PointOnSurface import PointOnSurface
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from .OffsetLine import OffsetLine
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from .PolygonCentroids import PolygonCentroids
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from .Translate import Translate
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pluginPath = os.path.normpath(os.path.join(
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os.path.split(os.path.dirname(__file__))[0], os.pardir))
@@ -205,7 +206,8 @@ def __init__(self):
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RectanglesOvalsDiamondsVariable(),
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RectanglesOvalsDiamondsFixed(), MergeLines(),
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BoundingBox(), Boundary(), PointOnSurface(),
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OffsetLine(), PolygonCentroids()
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OffsetLine(), PolygonCentroids(),
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Translate()
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]
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if hasMatplotlib:

‎python/plugins/processing/algs/qgis/Translate.py

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# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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Translate.py
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--------------
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Date : August 2016
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Copyright : (C) 2016 by Nyall Dawson
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Email : nyall dot dawson 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__ = 'Nyall Dawson'
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__date__ = 'August 2016'
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__copyright__ = '(C) 2016, Nyall Dawson'
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# This will get replaced with a git SHA1 when you do a git archive323
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__revision__ = '$Format:%H$'
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import os
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from qgis.core import QgsGeometry, QgsWkbTypes
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from qgis.PyQt.QtGui import QIcon
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
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from processing.core.parameters import ParameterVector, ParameterSelection, ParameterNumber
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from processing.core.outputs import OutputVector
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from processing.tools import dataobjects, vector
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class Translate(GeoAlgorithm):
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INPUT_LAYER = 'INPUT_LAYER'
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OUTPUT_LAYER = 'OUTPUT_LAYER'
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DELTA_X = 'DELTA_X'
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DELTA_Y = 'DELTA_Y'
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def defineCharacteristics(self):
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self.name, self.i18n_name = self.trAlgorithm('Translate geometry')
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self.group, self.i18n_group = self.trAlgorithm('Vector geometry tools')
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self.addParameter(ParameterVector(self.INPUT_LAYER,
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self.tr('Input layer'), [ParameterVector.VECTOR_TYPE_ANY]))
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self.addParameter(ParameterNumber(self.DELTA_X,
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self.tr('Offset distance (x-axis)'), default=1.0))
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self.addParameter(ParameterNumber(self.DELTA_Y,
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self.tr('Offset distance (y-axis)'), default=0.0))
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self.addOutput(OutputVector(self.OUTPUT_LAYER, self.tr('Translated')))
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def processAlgorithm(self, progress):
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layer = dataobjects.getObjectFromUri(
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self.getParameterValue(self.INPUT_LAYER))
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writer = self.getOutputFromName(
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self.OUTPUT_LAYER).getVectorWriter(
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layer.fields().toList(),
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layer.wkbType(),
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layer.crs())
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delta_x = self.getParameterValue(self.DELTA_X)
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delta_y = self.getParameterValue(self.DELTA_Y)
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features = vector.features(layer)
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total = 100.0 / len(features)
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for current, input_feature in enumerate(features):
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output_feature = input_feature
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input_geometry = input_feature.geometry()
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if input_geometry:
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output_geometry = input_geometry
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output_geometry.translate(delta_x, delta_y)
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if not output_geometry:
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raise GeoAlgorithmExecutionException(
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self.tr('Error translating geometry'))
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output_feature.setGeometry(output_geometry)
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writer.addFeature(output_feature)
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progress.setPercentage(int(current * total))
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del writer

‎python/plugins/processing/tests/testdata/expected/lines_translated.gfs

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<GMLFeatureClassList>
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<GMLFeatureClass>
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<Name>lines_translated</Name>
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<ElementPath>lines_translated</ElementPath>
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<GeometryType>2</GeometryType>
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<SRSName>EPSG:4326</SRSName>
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<DatasetSpecificInfo>
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<FeatureCount>7</FeatureCount>
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<ExtentXMin>-0.90000</ExtentXMin>
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<ExtentXMax>11.10000</ExtentXMax>
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<ExtentYMin>-3.20000</ExtentYMin>
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<ExtentYMax>4.80000</ExtentYMax>
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</DatasetSpecificInfo>
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</GMLFeatureClass>
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</GMLFeatureClassList>

‎python/plugins/processing/tests/testdata/expected/lines_translated.gml

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<?xml version="1.0" encoding="utf-8" ?>
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<ogr:FeatureCollection
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation=""
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xmlns:ogr="http://ogr.maptools.org/"
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xmlns:gml="http://www.opengis.net/gml">
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<gml:boundedBy>
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<gml:Box>
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<gml:coord><gml:X>-0.9</gml:X><gml:Y>-3.2</gml:Y></gml:coord>
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<gml:coord><gml:X>11.1</gml:X><gml:Y>4.8</gml:Y></gml:coord>
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</gml:Box>
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</gml:boundedBy>
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<gml:featureMember>
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<ogr:lines_translated fid="lines.0">
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<ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>6.1,1.8 9.1,1.8 9.1,2.8 11.1,4.8</gml:coordinates></gml:LineString></ogr:geometryProperty>
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</ogr:lines_translated>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:lines_translated fid="lines.1">
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<ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>-0.9,-1.2 1.1,-1.2</gml:coordinates></gml:LineString></ogr:geometryProperty>
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</ogr:lines_translated>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:lines_translated fid="lines.2">
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<ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>2.1,-0.2 2.1,1.8 3.1,1.8 3.1,2.8</gml:coordinates></gml:LineString></ogr:geometryProperty>
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</ogr:lines_translated>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:lines_translated fid="lines.3">
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<ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>3.1,0.8 5.1,0.8</gml:coordinates></gml:LineString></ogr:geometryProperty>
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</ogr:lines_translated>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:lines_translated fid="lines.4">
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<ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>7.1,-3.2 10.1,-3.2</gml:coordinates></gml:LineString></ogr:geometryProperty>
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</ogr:lines_translated>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:lines_translated fid="lines.5">
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<ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>6.1,-3.2 10.1,0.8</gml:coordinates></gml:LineString></ogr:geometryProperty>
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</ogr:lines_translated>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:lines_translated fid="lines.6">
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</ogr:lines_translated>
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</gml:featureMember>
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</ogr:FeatureCollection>

‎python/plugins/processing/tests/testdata/qgis_algorithm_tests.yaml

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name: expected/centroid_polys.gml
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type: vector
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- algorithm: qgis:translategeometry
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name: Lines translated
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params:
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DELTA_X: 0.1
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DELTA_Y: -0.2
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INPUT_LAYER:
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name: lines.gml
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type: vector
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results:
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OUTPUT_LAYER:
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name: expected/lines_translated.gml
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type: vector

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