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[FEATURE][processing] Interpolate point on line algorithm

This algorithm creates a point geometry interpolated at a
set distance along line (or polygon boundary) geometries.
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nyalldawson committed Aug 10, 2018
1 parent 7ef5631 commit 8365335fd3996987c225721f18baa9b9e7d84690
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<?xml version="1.0" encoding="utf-8" ?>
<ogr:FeatureCollection
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://ogr.maptools.org/ interpolate_point_lines.xsd"
xmlns:ogr="http://ogr.maptools.org/"
xmlns:gml="http://www.opengis.net/gml">
<gml:boundedBy>
<gml:Box>
<gml:coord><gml:X>0</gml:X><gml:Y>-3</gml:Y></gml:coord>
<gml:coord><gml:X>8</gml:X><gml:Y>2</gml:Y></gml:coord>
</gml:Box>
</gml:boundedBy>

<gml:featureMember>
<ogr:interpolate_point_lines fid="lines.0">
<ogr:geometryProperty><gml:Point srsName="EPSG:4326"><gml:coordinates>7,2</gml:coordinates></gml:Point></ogr:geometryProperty>
</ogr:interpolate_point_lines>
</gml:featureMember>
<gml:featureMember>
<ogr:interpolate_point_lines fid="lines.1">
<ogr:geometryProperty><gml:Point srsName="EPSG:4326"><gml:coordinates>0,-1</gml:coordinates></gml:Point></ogr:geometryProperty>
</ogr:interpolate_point_lines>
</gml:featureMember>
<gml:featureMember>
<ogr:interpolate_point_lines fid="lines.2">
<ogr:geometryProperty><gml:Point srsName="EPSG:4326"><gml:coordinates>2,1</gml:coordinates></gml:Point></ogr:geometryProperty>
</ogr:interpolate_point_lines>
</gml:featureMember>
<gml:featureMember>
<ogr:interpolate_point_lines fid="lines.3">
<ogr:geometryProperty><gml:Point srsName="EPSG:4326"><gml:coordinates>4,1</gml:coordinates></gml:Point></ogr:geometryProperty>
</ogr:interpolate_point_lines>
</gml:featureMember>
<gml:featureMember>
<ogr:interpolate_point_lines fid="lines.4">
<ogr:geometryProperty><gml:Point srsName="EPSG:4326"><gml:coordinates>8,-3</gml:coordinates></gml:Point></ogr:geometryProperty>
</ogr:interpolate_point_lines>
</gml:featureMember>
<gml:featureMember>
<ogr:interpolate_point_lines fid="lines.5">
<ogr:geometryProperty><gml:Point srsName="EPSG:4326"><gml:coordinates>6.70710678118655,-2.29289321881345</gml:coordinates></gml:Point></ogr:geometryProperty>
</ogr:interpolate_point_lines>
</gml:featureMember>
<gml:featureMember>
<ogr:interpolate_point_lines fid="lines.6">
</ogr:interpolate_point_lines>
</gml:featureMember>
</ogr:FeatureCollection>
@@ -0,0 +1,23 @@
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema targetNamespace="http://ogr.maptools.org/" xmlns:ogr="http://ogr.maptools.org/" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:gml="http://www.opengis.net/gml" elementFormDefault="qualified" version="1.0">
<xs:import namespace="http://www.opengis.net/gml" schemaLocation="http://schemas.opengis.net/gml/2.1.2/feature.xsd"/>
<xs:element name="FeatureCollection" type="ogr:FeatureCollectionType" substitutionGroup="gml:_FeatureCollection"/>
<xs:complexType name="FeatureCollectionType">
<xs:complexContent>
<xs:extension base="gml:AbstractFeatureCollectionType">
<xs:attribute name="lockId" type="xs:string" use="optional"/>
<xs:attribute name="scope" type="xs:string" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
<xs:element name="interpolate_point_lines" type="ogr:interpolate_point_lines_Type" substitutionGroup="gml:_Feature"/>
<xs:complexType name="interpolate_point_lines_Type">
<xs:complexContent>
<xs:extension base="gml:AbstractFeatureType">
<xs:sequence>
<xs:element name="geometryProperty" type="gml:PointPropertyType" nillable="true" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
</xs:schema>
@@ -0,0 +1,61 @@
<?xml version="1.0" encoding="utf-8" ?>
<ogr:FeatureCollection
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://ogr.maptools.org/ interpolate_point_polys.xsd"
xmlns:ogr="http://ogr.maptools.org/"
xmlns:gml="http://www.opengis.net/gml">
<gml:boundedBy>
<gml:Box>
<gml:coord><gml:X>-1</gml:X><gml:Y>1</gml:Y></gml:coord>
<gml:coord><gml:X>8</gml:X><gml:Y>6</gml:Y></gml:coord>
</gml:Box>
</gml:boundedBy>

<gml:featureMember>
<ogr:interpolate_point_polys fid="polys.0">
<ogr:geometryProperty><gml:Point srsName="EPSG:4326"><gml:coordinates>-1,1</gml:coordinates></gml:Point></ogr:geometryProperty>
<ogr:name>aaaaa</ogr:name>
<ogr:intval>33</ogr:intval>
<ogr:floatval>44.123456</ogr:floatval>
</ogr:interpolate_point_polys>
</gml:featureMember>
<gml:featureMember>
<ogr:interpolate_point_polys fid="polys.1">
<ogr:geometryProperty><gml:Point srsName="EPSG:4326"><gml:coordinates>5.41421356237309,4.0</gml:coordinates></gml:Point></ogr:geometryProperty>
<ogr:name>Aaaaa</ogr:name>
<ogr:intval>-33</ogr:intval>
<ogr:floatval>0</ogr:floatval>
</ogr:interpolate_point_polys>
</gml:featureMember>
<gml:featureMember>
<ogr:interpolate_point_polys fid="polys.2">
<ogr:geometryProperty><gml:Point srsName="EPSG:4326"><gml:coordinates>3,6</gml:coordinates></gml:Point></ogr:geometryProperty>
<ogr:name>bbaaa</ogr:name>
<ogr:intval xsi:nil="true"/>
<ogr:floatval>0.123</ogr:floatval>
</ogr:interpolate_point_polys>
</gml:featureMember>
<gml:featureMember>
<ogr:interpolate_point_polys fid="polys.3">
<ogr:geometryProperty><gml:Point srsName="EPSG:4326"><gml:coordinates>8,1</gml:coordinates></gml:Point></ogr:geometryProperty>
<ogr:name>ASDF</ogr:name>
<ogr:intval>0</ogr:intval>
<ogr:floatval xsi:nil="true"/>
</ogr:interpolate_point_polys>
</gml:featureMember>
<gml:featureMember>
<ogr:interpolate_point_polys fid="polys.4">
<ogr:name xsi:nil="true"/>
<ogr:intval>120</ogr:intval>
<ogr:floatval>-100291.43213</ogr:floatval>
</ogr:interpolate_point_polys>
</gml:featureMember>
<gml:featureMember>
<ogr:interpolate_point_polys fid="polys.5">
<ogr:geometryProperty><gml:Point srsName="EPSG:4326"><gml:coordinates>4.89736659610103,1.36754446796632</gml:coordinates></gml:Point></ogr:geometryProperty>
<ogr:name>elim</ogr:name>
<ogr:intval>2</ogr:intval>
<ogr:floatval>3.33</ogr:floatval>
</ogr:interpolate_point_polys>
</gml:featureMember>
</ogr:FeatureCollection>
@@ -0,0 +1,43 @@
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema targetNamespace="http://ogr.maptools.org/" xmlns:ogr="http://ogr.maptools.org/" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:gml="http://www.opengis.net/gml" elementFormDefault="qualified" version="1.0">
<xs:import namespace="http://www.opengis.net/gml" schemaLocation="http://schemas.opengis.net/gml/2.1.2/feature.xsd"/>
<xs:element name="FeatureCollection" type="ogr:FeatureCollectionType" substitutionGroup="gml:_FeatureCollection"/>
<xs:complexType name="FeatureCollectionType">
<xs:complexContent>
<xs:extension base="gml:AbstractFeatureCollectionType">
<xs:attribute name="lockId" type="xs:string" use="optional"/>
<xs:attribute name="scope" type="xs:string" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
<xs:element name="interpolate_point_polys" type="ogr:interpolate_point_polys_Type" substitutionGroup="gml:_Feature"/>
<xs:complexType name="interpolate_point_polys_Type">
<xs:complexContent>
<xs:extension base="gml:AbstractFeatureType">
<xs:sequence>
<xs:element name="geometryProperty" type="gml:PointPropertyType" nillable="true" minOccurs="0" maxOccurs="1"/>
<xs:element name="name" nillable="true" minOccurs="0" maxOccurs="1">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:maxLength value="5"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
<xs:element name="intval" nillable="true" minOccurs="0" maxOccurs="1">
<xs:simpleType>
<xs:restriction base="xs:integer">
<xs:totalDigits value="10"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
<xs:element name="floatval" nillable="true" minOccurs="0" maxOccurs="1">
<xs:simpleType>
<xs:restriction base="xs:decimal">
</xs:restriction>
</xs:simpleType>
</xs:element>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
</xs:schema>
@@ -3606,6 +3606,9 @@ tests:
OUTPUT:
name: expected/airportsvoronoidiagram.gml
type: vector
compare:
geometry:
precision: 2

- algorithm: native:explodelines
name: Explode lines
@@ -6056,5 +6059,29 @@ tests:
name: expected/line_substring.gml
type: vector

- algorithm: native:interpolatepoint
name: Interpolate points (line)
params:
DISTANCE: 1.0
INPUT:
name: lines.gml
type: vector
results:
OUTPUT:
name: expected/interpolate_point_lines.gml
type: vector

- algorithm: native:interpolatepoint
name: Interpolate points (polygons)
params:
DISTANCE: 2.0
INPUT:
name: polys.gml
type: vector
results:
OUTPUT:
name: expected/interpolate_point_polys.gml
type: vector


# See ../README.md for a description of the file format
@@ -47,6 +47,7 @@ SET(QGIS_ANALYSIS_SRCS
processing/qgsalgorithmfiltervertices.cpp
processing/qgsalgorithmfixgeometries.cpp
processing/qgsalgorithmimportphotos.cpp
processing/qgsalgorithminterpolatepoint.cpp
processing/qgsalgorithmintersection.cpp
processing/qgsalgorithmjoinbyattribute.cpp
processing/qgsalgorithmjoinwithlines.cpp
@@ -0,0 +1,127 @@
/***************************************************************************
qgsalgorithminterpolatepoint.cpp
---------------------
begin : August 2018
copyright : (C) 2018 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. *
* *
***************************************************************************/

#include "qgsalgorithminterpolatepoint.h"
#include "qgsgeometrycollection.h"
#include "qgscurve.h"

///@cond PRIVATE

QString QgsInterpolatePointAlgorithm::name() const
{
return QStringLiteral( "interpolatepoint" );
}

QString QgsInterpolatePointAlgorithm::displayName() const
{
return QObject::tr( "Interpolate point on line" );
}

QStringList QgsInterpolatePointAlgorithm::tags() const
{
return QObject::tr( "linestring,reference,referencing,distance,interpolate" ).split( ',' );
}

QString QgsInterpolatePointAlgorithm::group() const
{
return QObject::tr( "Vector geometry" );
}

QString QgsInterpolatePointAlgorithm::groupId() const
{
return QStringLiteral( "vectorgeometry" );
}

QString QgsInterpolatePointAlgorithm::outputName() const
{
return QObject::tr( "Interpolated points" );
}

QString QgsInterpolatePointAlgorithm::shortHelpString() const
{
return QObject::tr( "This algorithm creates a point geometry interpolated at a set distance along line geometries." );
}

QString QgsInterpolatePointAlgorithm::shortDescription() const
{
return QObject::tr( "Interpolates a point along lines at a set distance." );
}

QList<int> QgsInterpolatePointAlgorithm::inputLayerTypes() const
{
return QList<int>() << QgsProcessing::TypeVectorLine << QgsProcessing::TypeVectorPolygon;
}

QgsProcessing::SourceType QgsInterpolatePointAlgorithm::outputLayerType() const
{
return QgsProcessing::TypeVectorPoint;
}

QgsWkbTypes::Type QgsInterpolatePointAlgorithm::outputWkbType( QgsWkbTypes::Type ) const
{
return QgsWkbTypes::Point;
}

QgsInterpolatePointAlgorithm *QgsInterpolatePointAlgorithm::createInstance() const
{
return new QgsInterpolatePointAlgorithm();
}

void QgsInterpolatePointAlgorithm::initParameters( const QVariantMap & )
{
std::unique_ptr< QgsProcessingParameterDistance> distance = qgis::make_unique< QgsProcessingParameterDistance >( QStringLiteral( "DISTANCE" ),
QObject::tr( "Distance" ), 0.0, QStringLiteral( "INPUT" ), false, 0 );
distance->setIsDynamic( true );
distance->setDynamicPropertyDefinition( QgsPropertyDefinition( QStringLiteral( "DISTANCE" ), QObject::tr( "Distance" ), QgsPropertyDefinition::DoublePositive ) );
distance->setDynamicLayerParameterName( QStringLiteral( "INPUT" ) );
addParameter( distance.release() );
}

QgsProcessingFeatureSource::Flag QgsInterpolatePointAlgorithm::sourceFlags() const
{
// skip geometry checks - this algorithm doesn't care about invalid geometries
return QgsProcessingFeatureSource::FlagSkipGeometryValidityChecks;
}

bool QgsInterpolatePointAlgorithm::prepareAlgorithm( const QVariantMap &parameters, QgsProcessingContext &context, QgsProcessingFeedback * )
{
mDistance = parameterAsDouble( parameters, QStringLiteral( "DISTANCE" ), context );
mDynamicDistance = QgsProcessingParameters::isDynamic( parameters, QStringLiteral( "DISTANCE" ) );
if ( mDynamicDistance )
mDistanceProperty = parameters.value( QStringLiteral( "DISTANCE" ) ).value< QgsProperty >();

return true;
}

QgsFeatureList QgsInterpolatePointAlgorithm::processFeature( const QgsFeature &feature, QgsProcessingContext &context, QgsProcessingFeedback * )
{
QgsFeature f = feature;
if ( f.hasGeometry() )
{
const QgsGeometry geometry = f.geometry();
double distance = mDistance;
if ( mDynamicDistance )
distance = mDistanceProperty.valueAsDouble( context.expressionContext(), distance );

f.setGeometry( geometry.interpolate( distance ) );
}
return QgsFeatureList() << f;
}

///@endcond


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