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qgsogcutils.cpp
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qgsogcutils.cpp
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/***************************************************************************
qgsogcutils.cpp
---------------------
begin : March 2013
copyright : (C) 2013 by Martin Dobias
email : wonder dot sk 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 "qgsogcutils.h"
#include "qgsexpression.h"
#include "qgsexpressionnodeimpl.h"
#include "qgsexpressionfunction.h"
#include "qgsexpressionprivate.h"
#include "qgsgeometry.h"
#include "qgswkbptr.h"
#include "qgscoordinatereferencesystem.h"
#include "qgsrectangle.h"
#include <QColor>
#include <QStringList>
#include <QTextStream>
#include <QObject>
#ifndef Q_OS_WIN
#include <netinet/in.h>
#else
#include <winsock.h>
#endif
static const QString GML_NAMESPACE = QStringLiteral( "http://www.opengis.net/gml" );
static const QString GML32_NAMESPACE = QStringLiteral( "http://www.opengis.net/gml/3.2" );
static const QString OGC_NAMESPACE = QStringLiteral( "http://www.opengis.net/ogc" );
static const QString FES_NAMESPACE = QStringLiteral( "http://www.opengis.net/fes/2.0" );
QgsOgcUtilsExprToFilter::QgsOgcUtilsExprToFilter( QDomDocument &doc,
QgsOgcUtils::GMLVersion gmlVersion,
QgsOgcUtils::FilterVersion filterVersion,
const QString &geometryName,
const QString &srsName,
bool honourAxisOrientation,
bool invertAxisOrientation )
: mDoc( doc )
, mGMLUsed( false )
, mGMLVersion( gmlVersion )
, mFilterVersion( filterVersion )
, mGeometryName( geometryName )
, mSrsName( srsName )
, mInvertAxisOrientation( invertAxisOrientation )
, mFilterPrefix( ( filterVersion == QgsOgcUtils::FILTER_FES_2_0 ) ? "fes" : "ogc" )
, mPropertyName( ( filterVersion == QgsOgcUtils::FILTER_FES_2_0 ) ? "ValueReference" : "PropertyName" )
, mGeomId( 1 )
{
QgsCoordinateReferenceSystem crs;
if ( !mSrsName.isEmpty() )
crs = QgsCoordinateReferenceSystem::fromOgcWmsCrs( mSrsName );
if ( crs.isValid() )
{
if ( honourAxisOrientation && crs.hasAxisInverted() )
{
mInvertAxisOrientation = !mInvertAxisOrientation;
}
}
}
QgsGeometry QgsOgcUtils::geometryFromGML( const QDomNode &geometryNode )
{
QDomElement geometryTypeElement = geometryNode.toElement();
QString geomType = geometryTypeElement.tagName();
if ( !( geomType == QLatin1String( "Point" ) || geomType == QLatin1String( "LineString" ) || geomType == QLatin1String( "Polygon" ) ||
geomType == QLatin1String( "MultiPoint" ) || geomType == QLatin1String( "MultiLineString" ) || geomType == QLatin1String( "MultiPolygon" ) ||
geomType == QLatin1String( "Box" ) || geomType == QLatin1String( "Envelope" ) ) )
{
QDomNode geometryChild = geometryNode.firstChild();
if ( geometryChild.isNull() )
{
return QgsGeometry();
}
geometryTypeElement = geometryChild.toElement();
geomType = geometryTypeElement.tagName();
}
if ( !( geomType == QLatin1String( "Point" ) || geomType == QLatin1String( "LineString" ) || geomType == QLatin1String( "Polygon" ) ||
geomType == QLatin1String( "MultiPoint" ) || geomType == QLatin1String( "MultiLineString" ) || geomType == QLatin1String( "MultiPolygon" ) ||
geomType == QLatin1String( "Box" ) || geomType == QLatin1String( "Envelope" ) ) )
return QgsGeometry();
if ( geomType == QLatin1String( "Point" ) )
{
return geometryFromGMLPoint( geometryTypeElement );
}
else if ( geomType == QLatin1String( "LineString" ) )
{
return geometryFromGMLLineString( geometryTypeElement );
}
else if ( geomType == QLatin1String( "Polygon" ) )
{
return geometryFromGMLPolygon( geometryTypeElement );
}
else if ( geomType == QLatin1String( "MultiPoint" ) )
{
return geometryFromGMLMultiPoint( geometryTypeElement );
}
else if ( geomType == QLatin1String( "MultiLineString" ) )
{
return geometryFromGMLMultiLineString( geometryTypeElement );
}
else if ( geomType == QLatin1String( "MultiPolygon" ) )
{
return geometryFromGMLMultiPolygon( geometryTypeElement );
}
else if ( geomType == QLatin1String( "Box" ) )
{
return QgsGeometry::fromRect( rectangleFromGMLBox( geometryTypeElement ) );
}
else if ( geomType == QLatin1String( "Envelope" ) )
{
return QgsGeometry::fromRect( rectangleFromGMLEnvelope( geometryTypeElement ) );
}
else //unknown type
{
return QgsGeometry();
}
}
QgsGeometry QgsOgcUtils::geometryFromGML( const QString &xmlString )
{
// wrap the string into a root tag to have "gml" namespace (and also as a default namespace)
QString xml = QStringLiteral( "<tmp xmlns=\"%1\" xmlns:gml=\"%1\">%2</tmp>" ).arg( GML_NAMESPACE, xmlString );
QDomDocument doc;
if ( !doc.setContent( xml, true ) )
return QgsGeometry();
return geometryFromGML( doc.documentElement().firstChildElement() );
}
QgsGeometry QgsOgcUtils::geometryFromGMLPoint( const QDomElement &geometryElement )
{
QgsPolylineXY pointCoordinate;
QDomNodeList coordList = geometryElement.elementsByTagNameNS( GML_NAMESPACE, QStringLiteral( "coordinates" ) );
if ( !coordList.isEmpty() )
{
QDomElement coordElement = coordList.at( 0 ).toElement();
if ( readGMLCoordinates( pointCoordinate, coordElement ) != 0 )
{
return QgsGeometry();
}
}
else
{
QDomNodeList posList = geometryElement.elementsByTagNameNS( GML_NAMESPACE, QStringLiteral( "pos" ) );
if ( posList.size() < 1 )
{
return QgsGeometry();
}
QDomElement posElement = posList.at( 0 ).toElement();
if ( readGMLPositions( pointCoordinate, posElement ) != 0 )
{
return QgsGeometry();
}
}
if ( pointCoordinate.empty() )
{
return QgsGeometry();
}
QgsPolylineXY::const_iterator point_it = pointCoordinate.constBegin();
char e = htonl( 1 ) != 1;
double x = point_it->x();
double y = point_it->y();
int size = 1 + sizeof( int ) + 2 * sizeof( double );
QgsWkbTypes::Type type = QgsWkbTypes::Point;
unsigned char *wkb = new unsigned char[size];
int wkbPosition = 0; //current offset from wkb beginning (in bytes)
memcpy( &( wkb )[wkbPosition], &e, 1 );
wkbPosition += 1;
memcpy( &( wkb )[wkbPosition], &type, sizeof( int ) );
wkbPosition += sizeof( int );
memcpy( &( wkb )[wkbPosition], &x, sizeof( double ) );
wkbPosition += sizeof( double );
memcpy( &( wkb )[wkbPosition], &y, sizeof( double ) );
QgsGeometry g;
g.fromWkb( wkb, size );
return g;
}
QgsGeometry QgsOgcUtils::geometryFromGMLLineString( const QDomElement &geometryElement )
{
QgsPolylineXY lineCoordinates;
QDomNodeList coordList = geometryElement.elementsByTagNameNS( GML_NAMESPACE, QStringLiteral( "coordinates" ) );
if ( !coordList.isEmpty() )
{
QDomElement coordElement = coordList.at( 0 ).toElement();
if ( readGMLCoordinates( lineCoordinates, coordElement ) != 0 )
{
return QgsGeometry();
}
}
else
{
QDomNodeList posList = geometryElement.elementsByTagNameNS( GML_NAMESPACE, QStringLiteral( "posList" ) );
if ( posList.size() < 1 )
{
return QgsGeometry();
}
QDomElement posElement = posList.at( 0 ).toElement();
if ( readGMLPositions( lineCoordinates, posElement ) != 0 )
{
return QgsGeometry();
}
}
char e = htonl( 1 ) != 1;
int size = 1 + 2 * sizeof( int ) + lineCoordinates.size() * 2 * sizeof( double );
QgsWkbTypes::Type type = QgsWkbTypes::LineString;
unsigned char *wkb = new unsigned char[size];
int wkbPosition = 0; //current offset from wkb beginning (in bytes)
double x, y;
int nPoints = lineCoordinates.size();
//fill the contents into *wkb
memcpy( &( wkb )[wkbPosition], &e, 1 );
wkbPosition += 1;
memcpy( &( wkb )[wkbPosition], &type, sizeof( int ) );
wkbPosition += sizeof( int );
memcpy( &( wkb )[wkbPosition], &nPoints, sizeof( int ) );
wkbPosition += sizeof( int );
QgsPolylineXY::const_iterator iter;
for ( iter = lineCoordinates.constBegin(); iter != lineCoordinates.constEnd(); ++iter )
{
x = iter->x();
y = iter->y();
memcpy( &( wkb )[wkbPosition], &x, sizeof( double ) );
wkbPosition += sizeof( double );
memcpy( &( wkb )[wkbPosition], &y, sizeof( double ) );
wkbPosition += sizeof( double );
}
QgsGeometry g;
g.fromWkb( wkb, size );
return g;
}
QgsGeometry QgsOgcUtils::geometryFromGMLPolygon( const QDomElement &geometryElement )
{
//read all the coordinates (as QgsPoint) into memory. Each linear ring has an entry in the vector
QgsMultiPolylineXY ringCoordinates;
//read coordinates for outer boundary
QgsPolylineXY exteriorPointList;
QDomNodeList outerBoundaryList = geometryElement.elementsByTagNameNS( GML_NAMESPACE, QStringLiteral( "outerBoundaryIs" ) );
if ( !outerBoundaryList.isEmpty() ) //outer ring is necessary
{
QDomElement coordinatesElement = outerBoundaryList.at( 0 ).firstChild().firstChild().toElement();
if ( coordinatesElement.isNull() )
{
return QgsGeometry();
}
if ( readGMLCoordinates( exteriorPointList, coordinatesElement ) != 0 )
{
return QgsGeometry();
}
ringCoordinates.push_back( exteriorPointList );
//read coordinates for inner boundary
QDomNodeList innerBoundaryList = geometryElement.elementsByTagNameNS( GML_NAMESPACE, QStringLiteral( "innerBoundaryIs" ) );
for ( int i = 0; i < innerBoundaryList.size(); ++i )
{
QgsPolylineXY interiorPointList;
coordinatesElement = innerBoundaryList.at( i ).firstChild().firstChild().toElement();
if ( coordinatesElement.isNull() )
{
return QgsGeometry();
}
if ( readGMLCoordinates( interiorPointList, coordinatesElement ) != 0 )
{
return QgsGeometry();
}
ringCoordinates.push_back( interiorPointList );
}
}
else
{
//read coordinates for exterior
QDomNodeList exteriorList = geometryElement.elementsByTagNameNS( GML_NAMESPACE, QStringLiteral( "exterior" ) );
if ( exteriorList.size() < 1 ) //outer ring is necessary
{
return QgsGeometry();
}
QDomElement posElement = exteriorList.at( 0 ).firstChild().firstChild().toElement();
if ( posElement.isNull() )
{
return QgsGeometry();
}
if ( readGMLPositions( exteriorPointList, posElement ) != 0 )
{
return QgsGeometry();
}
ringCoordinates.push_back( exteriorPointList );
//read coordinates for inner boundary
QDomNodeList interiorList = geometryElement.elementsByTagNameNS( GML_NAMESPACE, QStringLiteral( "interior" ) );
for ( int i = 0; i < interiorList.size(); ++i )
{
QgsPolylineXY interiorPointList;
QDomElement posElement = interiorList.at( i ).firstChild().firstChild().toElement();
if ( posElement.isNull() )
{
return QgsGeometry();
}
if ( readGMLPositions( interiorPointList, posElement ) != 0 )
{
return QgsGeometry();
}
ringCoordinates.push_back( interiorPointList );
}
}
//calculate number of bytes to allocate
int nrings = ringCoordinates.size();
if ( nrings < 1 )
return QgsGeometry();
int npoints = 0;//total number of points
for ( QgsMultiPolylineXY::const_iterator it = ringCoordinates.constBegin(); it != ringCoordinates.constEnd(); ++it )
{
npoints += it->size();
}
int size = 1 + 2 * sizeof( int ) + nrings * sizeof( int ) + 2 * npoints * sizeof( double );
QgsWkbTypes::Type type = QgsWkbTypes::Polygon;
unsigned char *wkb = new unsigned char[size];
//char e = QgsApplication::endian();
char e = htonl( 1 ) != 1;
int wkbPosition = 0; //current offset from wkb beginning (in bytes)
int nPointsInRing = 0;
double x, y;
//fill the contents into *wkb
memcpy( &( wkb )[wkbPosition], &e, 1 );
wkbPosition += 1;
memcpy( &( wkb )[wkbPosition], &type, sizeof( int ) );
wkbPosition += sizeof( int );
memcpy( &( wkb )[wkbPosition], &nrings, sizeof( int ) );
wkbPosition += sizeof( int );
for ( QgsMultiPolylineXY::const_iterator it = ringCoordinates.constBegin(); it != ringCoordinates.constEnd(); ++it )
{
nPointsInRing = it->size();
memcpy( &( wkb )[wkbPosition], &nPointsInRing, sizeof( int ) );
wkbPosition += sizeof( int );
//iterate through the string list converting the strings to x-/y- doubles
QgsPolylineXY::const_iterator iter;
for ( iter = it->begin(); iter != it->end(); ++iter )
{
x = iter->x();
y = iter->y();
//qWarning("currentCoordinate: " + QString::number(x) + " // " + QString::number(y));
memcpy( &( wkb )[wkbPosition], &x, sizeof( double ) );
wkbPosition += sizeof( double );
memcpy( &( wkb )[wkbPosition], &y, sizeof( double ) );
wkbPosition += sizeof( double );
}
}
QgsGeometry g;
g.fromWkb( wkb, size );
return g;
}
QgsGeometry QgsOgcUtils::geometryFromGMLMultiPoint( const QDomElement &geometryElement )
{
QgsPolylineXY pointList;
QgsPolylineXY currentPoint;
QDomNodeList pointMemberList = geometryElement.elementsByTagNameNS( GML_NAMESPACE, QStringLiteral( "pointMember" ) );
if ( pointMemberList.size() < 1 )
{
return QgsGeometry();
}
QDomNodeList pointNodeList;
// coordinates or pos element
QDomNodeList coordinatesList;
QDomNodeList posList;
for ( int i = 0; i < pointMemberList.size(); ++i )
{
//<Point> element
pointNodeList = pointMemberList.at( i ).toElement().elementsByTagNameNS( GML_NAMESPACE, QStringLiteral( "Point" ) );
if ( pointNodeList.size() < 1 )
{
continue;
}
//<coordinates> element
coordinatesList = pointNodeList.at( 0 ).toElement().elementsByTagNameNS( GML_NAMESPACE, QStringLiteral( "coordinates" ) );
if ( !coordinatesList.isEmpty() )
{
currentPoint.clear();
if ( readGMLCoordinates( currentPoint, coordinatesList.at( 0 ).toElement() ) != 0 )
{
continue;
}
if ( currentPoint.empty() )
{
continue;
}
pointList.push_back( ( *currentPoint.begin() ) );
continue;
}
else
{
//<pos> element
posList = pointNodeList.at( 0 ).toElement().elementsByTagNameNS( GML_NAMESPACE, QStringLiteral( "pos" ) );
if ( posList.size() < 1 )
{
continue;
}
currentPoint.clear();
if ( readGMLPositions( currentPoint, posList.at( 0 ).toElement() ) != 0 )
{
continue;
}
if ( currentPoint.empty() )
{
continue;
}
pointList.push_back( ( *currentPoint.begin() ) );
}
}
int nPoints = pointList.size(); //number of points
if ( nPoints < 1 )
return QgsGeometry();
//calculate the required wkb size
int size = 1 + 2 * sizeof( int ) + pointList.size() * ( 2 * sizeof( double ) + 1 + sizeof( int ) );
QgsWkbTypes::Type type = QgsWkbTypes::MultiPoint;
unsigned char *wkb = new unsigned char[size];
//fill the wkb content
char e = htonl( 1 ) != 1;
int wkbPosition = 0; //current offset from wkb beginning (in bytes)
double x, y;
memcpy( &( wkb )[wkbPosition], &e, 1 );
wkbPosition += 1;
memcpy( &( wkb )[wkbPosition], &type, sizeof( int ) );
wkbPosition += sizeof( int );
memcpy( &( wkb )[wkbPosition], &nPoints, sizeof( int ) );
wkbPosition += sizeof( int );
type = QgsWkbTypes::Point;
for ( QgsPolylineXY::const_iterator it = pointList.constBegin(); it != pointList.constEnd(); ++it )
{
memcpy( &( wkb )[wkbPosition], &e, 1 );
wkbPosition += 1;
memcpy( &( wkb )[wkbPosition], &type, sizeof( int ) );
wkbPosition += sizeof( int );
x = it->x();
memcpy( &( wkb )[wkbPosition], &x, sizeof( double ) );
wkbPosition += sizeof( double );
y = it->y();
memcpy( &( wkb )[wkbPosition], &y, sizeof( double ) );
wkbPosition += sizeof( double );
}
QgsGeometry g;
g.fromWkb( wkb, size );
return g;
}
QgsGeometry QgsOgcUtils::geometryFromGMLMultiLineString( const QDomElement &geometryElement )
{
//geoserver has
//<gml:MultiLineString>
//<gml:lineStringMember>
//<gml:LineString>
//mapserver has directly
//<gml:MultiLineString
//<gml:LineString
QList< QgsPolylineXY > lineCoordinates; //first list: lines, second list: points of one line
QDomElement currentLineStringElement;
QDomNodeList currentCoordList;
QDomNodeList currentPosList;
QDomNodeList lineStringMemberList = geometryElement.elementsByTagNameNS( GML_NAMESPACE, QStringLiteral( "lineStringMember" ) );
if ( !lineStringMemberList.isEmpty() ) //geoserver
{
for ( int i = 0; i < lineStringMemberList.size(); ++i )
{
QDomNodeList lineStringNodeList = lineStringMemberList.at( i ).toElement().elementsByTagNameNS( GML_NAMESPACE, QStringLiteral( "LineString" ) );
if ( lineStringNodeList.size() < 1 )
{
return QgsGeometry();
}
currentLineStringElement = lineStringNodeList.at( 0 ).toElement();
currentCoordList = currentLineStringElement.elementsByTagNameNS( GML_NAMESPACE, QStringLiteral( "coordinates" ) );
if ( !currentCoordList.isEmpty() )
{
QgsPolylineXY currentPointList;
if ( readGMLCoordinates( currentPointList, currentCoordList.at( 0 ).toElement() ) != 0 )
{
return QgsGeometry();
}
lineCoordinates.push_back( currentPointList );
}
else
{
currentPosList = currentLineStringElement.elementsByTagNameNS( GML_NAMESPACE, QStringLiteral( "posList" ) );
if ( currentPosList.size() < 1 )
{
return QgsGeometry();
}
QgsPolylineXY currentPointList;
if ( readGMLPositions( currentPointList, currentPosList.at( 0 ).toElement() ) != 0 )
{
return QgsGeometry();
}
lineCoordinates.push_back( currentPointList );
}
}
}
else
{
QDomNodeList lineStringList = geometryElement.elementsByTagNameNS( GML_NAMESPACE, QStringLiteral( "LineString" ) );
if ( !lineStringList.isEmpty() ) //mapserver
{
for ( int i = 0; i < lineStringList.size(); ++i )
{
currentLineStringElement = lineStringList.at( i ).toElement();
currentCoordList = currentLineStringElement.elementsByTagNameNS( GML_NAMESPACE, QStringLiteral( "coordinates" ) );
if ( !currentCoordList.isEmpty() )
{
QgsPolylineXY currentPointList;
if ( readGMLCoordinates( currentPointList, currentCoordList.at( 0 ).toElement() ) != 0 )
{
return QgsGeometry();
}
lineCoordinates.push_back( currentPointList );
return QgsGeometry();
}
else
{
currentPosList = currentLineStringElement.elementsByTagNameNS( GML_NAMESPACE, QStringLiteral( "posList" ) );
if ( currentPosList.size() < 1 )
{
return QgsGeometry();
}
QgsPolylineXY currentPointList;
if ( readGMLPositions( currentPointList, currentPosList.at( 0 ).toElement() ) != 0 )
{
return QgsGeometry();
}
lineCoordinates.push_back( currentPointList );
}
}
}
else
{
return QgsGeometry();
}
}
int nLines = lineCoordinates.size();
if ( nLines < 1 )
return QgsGeometry();
//calculate the required wkb size
int size = ( lineCoordinates.size() + 1 ) * ( 1 + 2 * sizeof( int ) );
for ( QList< QgsPolylineXY >::const_iterator it = lineCoordinates.constBegin(); it != lineCoordinates.constEnd(); ++it )
{
size += it->size() * 2 * sizeof( double );
}
QgsWkbTypes::Type type = QgsWkbTypes::MultiLineString;
unsigned char *wkb = new unsigned char[size];
//fill the wkb content
char e = htonl( 1 ) != 1;
int wkbPosition = 0; //current offset from wkb beginning (in bytes)
int nPoints; //number of points in a line
double x, y;
memcpy( &( wkb )[wkbPosition], &e, 1 );
wkbPosition += 1;
memcpy( &( wkb )[wkbPosition], &type, sizeof( int ) );
wkbPosition += sizeof( int );
memcpy( &( wkb )[wkbPosition], &nLines, sizeof( int ) );
wkbPosition += sizeof( int );
type = QgsWkbTypes::LineString;
for ( QList< QgsPolylineXY >::const_iterator it = lineCoordinates.constBegin(); it != lineCoordinates.constEnd(); ++it )
{
memcpy( &( wkb )[wkbPosition], &e, 1 );
wkbPosition += 1;
memcpy( &( wkb )[wkbPosition], &type, sizeof( int ) );
wkbPosition += sizeof( int );
nPoints = it->size();
memcpy( &( wkb )[wkbPosition], &nPoints, sizeof( int ) );
wkbPosition += sizeof( int );
for ( QgsPolylineXY::const_iterator iter = it->begin(); iter != it->end(); ++iter )
{
x = iter->x();
y = iter->y();
// QgsDebugMsg( QString( "x, y is %1,%2" ).arg( x, 'f' ).arg( y, 'f' ) );
memcpy( &( wkb )[wkbPosition], &x, sizeof( double ) );
wkbPosition += sizeof( double );
memcpy( &( wkb )[wkbPosition], &y, sizeof( double ) );
wkbPosition += sizeof( double );
}
}
QgsGeometry g;
g.fromWkb( wkb, size );
return g;
}
QgsGeometry QgsOgcUtils::geometryFromGMLMultiPolygon( const QDomElement &geometryElement )
{
//first list: different polygons, second list: different rings, third list: different points
QgsMultiPolygonXY multiPolygonPoints;
QDomElement currentPolygonMemberElement;
QDomNodeList polygonList;
QDomElement currentPolygonElement;
// rings in GML2
QDomNodeList outerBoundaryList;
QDomElement currentOuterBoundaryElement;
QDomNodeList innerBoundaryList;
QDomElement currentInnerBoundaryElement;
// rings in GML3
QDomNodeList exteriorList;
QDomElement currentExteriorElement;
QDomElement currentInteriorElement;
QDomNodeList interiorList;
// lienar ring
QDomNodeList linearRingNodeList;
QDomElement currentLinearRingElement;
// Coordinates or position list
QDomNodeList currentCoordinateList;
QDomNodeList currentPosList;
QDomNodeList polygonMemberList = geometryElement.elementsByTagNameNS( GML_NAMESPACE, QStringLiteral( "polygonMember" ) );
QgsPolygonXY currentPolygonList;
for ( int i = 0; i < polygonMemberList.size(); ++i )
{
currentPolygonList.resize( 0 ); // preserve capacity - don't use clear
currentPolygonMemberElement = polygonMemberList.at( i ).toElement();
polygonList = currentPolygonMemberElement.elementsByTagNameNS( GML_NAMESPACE, QStringLiteral( "Polygon" ) );
if ( polygonList.size() < 1 )
{
continue;
}
currentPolygonElement = polygonList.at( 0 ).toElement();
//find exterior ring
outerBoundaryList = currentPolygonElement.elementsByTagNameNS( GML_NAMESPACE, QStringLiteral( "outerBoundaryIs" ) );
if ( !outerBoundaryList.isEmpty() )
{
currentOuterBoundaryElement = outerBoundaryList.at( 0 ).toElement();
QgsPolylineXY ringCoordinates;
linearRingNodeList = currentOuterBoundaryElement.elementsByTagNameNS( GML_NAMESPACE, QStringLiteral( "LinearRing" ) );
if ( linearRingNodeList.size() < 1 )
{
continue;
}
currentLinearRingElement = linearRingNodeList.at( 0 ).toElement();
currentCoordinateList = currentLinearRingElement.elementsByTagNameNS( GML_NAMESPACE, QStringLiteral( "coordinates" ) );
if ( currentCoordinateList.size() < 1 )
{
continue;
}
if ( readGMLCoordinates( ringCoordinates, currentCoordinateList.at( 0 ).toElement() ) != 0 )
{
continue;
}
currentPolygonList.push_back( ringCoordinates );
//find interior rings
QDomNodeList innerBoundaryList = currentPolygonElement.elementsByTagNameNS( GML_NAMESPACE, QStringLiteral( "innerBoundaryIs" ) );
for ( int j = 0; j < innerBoundaryList.size(); ++j )
{
QgsPolylineXY ringCoordinates;
currentInnerBoundaryElement = innerBoundaryList.at( j ).toElement();
linearRingNodeList = currentInnerBoundaryElement.elementsByTagNameNS( GML_NAMESPACE, QStringLiteral( "LinearRing" ) );
if ( linearRingNodeList.size() < 1 )
{
continue;
}
currentLinearRingElement = linearRingNodeList.at( 0 ).toElement();
currentCoordinateList = currentLinearRingElement.elementsByTagNameNS( GML_NAMESPACE, QStringLiteral( "coordinates" ) );
if ( currentCoordinateList.size() < 1 )
{
continue;
}
if ( readGMLCoordinates( ringCoordinates, currentCoordinateList.at( 0 ).toElement() ) != 0 )
{
continue;
}
currentPolygonList.push_back( ringCoordinates );
}
}
else
{
//find exterior ring
exteriorList = currentPolygonElement.elementsByTagNameNS( GML_NAMESPACE, QStringLiteral( "exterior" ) );
if ( exteriorList.size() < 1 )
{
continue;
}
currentExteriorElement = exteriorList.at( 0 ).toElement();
QgsPolylineXY ringPositions;
linearRingNodeList = currentExteriorElement.elementsByTagNameNS( GML_NAMESPACE, QStringLiteral( "LinearRing" ) );
if ( linearRingNodeList.size() < 1 )
{
continue;
}
currentLinearRingElement = linearRingNodeList.at( 0 ).toElement();
currentPosList = currentLinearRingElement.elementsByTagNameNS( GML_NAMESPACE, QStringLiteral( "posList" ) );
if ( currentPosList.size() < 1 )
{
continue;
}
if ( readGMLPositions( ringPositions, currentPosList.at( 0 ).toElement() ) != 0 )
{
continue;
}
currentPolygonList.push_back( ringPositions );
//find interior rings
QDomNodeList interiorList = currentPolygonElement.elementsByTagNameNS( GML_NAMESPACE, QStringLiteral( "interior" ) );
for ( int j = 0; j < interiorList.size(); ++j )
{
QgsPolylineXY ringPositions;
currentInteriorElement = interiorList.at( j ).toElement();
linearRingNodeList = currentInteriorElement.elementsByTagNameNS( GML_NAMESPACE, QStringLiteral( "LinearRing" ) );
if ( linearRingNodeList.size() < 1 )
{
continue;
}
currentLinearRingElement = linearRingNodeList.at( 0 ).toElement();
currentPosList = currentLinearRingElement.elementsByTagNameNS( GML_NAMESPACE, QStringLiteral( "posList" ) );
if ( currentPosList.size() < 1 )
{
continue;
}
if ( readGMLPositions( ringPositions, currentPosList.at( 0 ).toElement() ) != 0 )
{
continue;
}
currentPolygonList.push_back( ringPositions );
}
}
multiPolygonPoints.push_back( currentPolygonList );
}
int nPolygons = multiPolygonPoints.size();
if ( nPolygons < 1 )
return QgsGeometry();
int size = 1 + 2 * sizeof( int );
//calculate the wkb size
for ( QgsMultiPolygonXY::const_iterator it = multiPolygonPoints.constBegin(); it != multiPolygonPoints.constEnd(); ++it )
{
size += 1 + 2 * sizeof( int );
for ( QgsPolygonXY::const_iterator iter = it->begin(); iter != it->end(); ++iter )
{
size += sizeof( int ) + 2 * iter->size() * sizeof( double );
}
}
QgsWkbTypes::Type type = QgsWkbTypes::MultiPolygon;
unsigned char *wkb = new unsigned char[size];
char e = htonl( 1 ) != 1;
int wkbPosition = 0; //current offset from wkb beginning (in bytes)
double x, y;
int nRings;
int nPointsInRing;
//fill the contents into *wkb
memcpy( &( wkb )[wkbPosition], &e, 1 );
wkbPosition += 1;
memcpy( &( wkb )[wkbPosition], &type, sizeof( int ) );
wkbPosition += sizeof( int );
memcpy( &( wkb )[wkbPosition], &nPolygons, sizeof( int ) );
wkbPosition += sizeof( int );
type = QgsWkbTypes::Polygon;
for ( QgsMultiPolygonXY::const_iterator it = multiPolygonPoints.constBegin(); it != multiPolygonPoints.constEnd(); ++it )
{
memcpy( &( wkb )[wkbPosition], &e, 1 );
wkbPosition += 1;
memcpy( &( wkb )[wkbPosition], &type, sizeof( int ) );
wkbPosition += sizeof( int );
nRings = it->size();
memcpy( &( wkb )[wkbPosition], &nRings, sizeof( int ) );
wkbPosition += sizeof( int );
for ( QgsPolygonXY::const_iterator iter = it->begin(); iter != it->end(); ++iter )
{
nPointsInRing = iter->size();
memcpy( &( wkb )[wkbPosition], &nPointsInRing, sizeof( int ) );
wkbPosition += sizeof( int );
for ( QgsPolylineXY::const_iterator iterator = iter->begin(); iterator != iter->end(); ++iterator )
{
x = iterator->x();
y = iterator->y();
memcpy( &( wkb )[wkbPosition], &x, sizeof( double ) );
wkbPosition += sizeof( double );
memcpy( &( wkb )[wkbPosition], &y, sizeof( double ) );
wkbPosition += sizeof( double );
}
}
}
QgsGeometry g;
g.fromWkb( wkb, size );
return g;
}
bool QgsOgcUtils::readGMLCoordinates( QgsPolylineXY &coords, const QDomElement &elem )
{
QString coordSeparator = QStringLiteral( "," );
QString tupelSeparator = QStringLiteral( " " );
//"decimal" has to be "."
coords.clear();
if ( elem.hasAttribute( QStringLiteral( "cs" ) ) )
{
coordSeparator = elem.attribute( QStringLiteral( "cs" ) );
}
if ( elem.hasAttribute( QStringLiteral( "ts" ) ) )
{
tupelSeparator = elem.attribute( QStringLiteral( "ts" ) );
}
QStringList tupels = elem.text().split( tupelSeparator, QString::SkipEmptyParts );
QStringList tupel_coords;
double x, y;
bool conversionSuccess;
QStringList::const_iterator it;
for ( it = tupels.constBegin(); it != tupels.constEnd(); ++it )
{
tupel_coords = ( *it ).split( coordSeparator, QString::SkipEmptyParts );
if ( tupel_coords.size() < 2 )
{
continue;
}
x = tupel_coords.at( 0 ).toDouble( &conversionSuccess );
if ( !conversionSuccess )
{
return true;
}
y = tupel_coords.at( 1 ).toDouble( &conversionSuccess );
if ( !conversionSuccess )
{
return true;
}
coords.push_back( QgsPointXY( x, y ) );
}
return false;
}
QgsRectangle QgsOgcUtils::rectangleFromGMLBox( const QDomNode &boxNode )
{
QgsRectangle rect;
QDomElement boxElem = boxNode.toElement();
if ( boxElem.tagName() != QLatin1String( "Box" ) )
return rect;
QDomElement bElem = boxElem.firstChild().toElement();
QString coordSeparator = QStringLiteral( "," );
QString tupelSeparator = QStringLiteral( " " );
if ( bElem.hasAttribute( QStringLiteral( "cs" ) ) )
{
coordSeparator = bElem.attribute( QStringLiteral( "cs" ) );
}
if ( bElem.hasAttribute( QStringLiteral( "ts" ) ) )
{
tupelSeparator = bElem.attribute( QStringLiteral( "ts" ) );
}
QString bString = bElem.text();
bool ok1, ok2, ok3, ok4;
double xmin = bString.section( tupelSeparator, 0, 0 ).section( coordSeparator, 0, 0 ).toDouble( &ok1 );
double ymin = bString.section( tupelSeparator, 0, 0 ).section( coordSeparator, 1, 1 ).toDouble( &ok2 );
double xmax = bString.section( tupelSeparator, 1, 1 ).section( coordSeparator, 0, 0 ).toDouble( &ok3 );
double ymax = bString.section( tupelSeparator, 1, 1 ).section( coordSeparator, 1, 1 ).toDouble( &ok4 );
if ( ok1 && ok2 && ok3 && ok4 )
{
rect = QgsRectangle( xmin, ymin, xmax, ymax );
rect.normalize();
}
return rect;
}
bool QgsOgcUtils::readGMLPositions( QgsPolylineXY &coords, const QDomElement &elem )
{
coords.clear();
QStringList pos = elem.text().split( ' ', QString::SkipEmptyParts );
double x, y;
bool conversionSuccess;
int posSize = pos.size();
int srsDimension = 2;
if ( elem.hasAttribute( QStringLiteral( "srsDimension" ) ) )
{
srsDimension = elem.attribute( QStringLiteral( "srsDimension" ) ).toInt( &conversionSuccess );
if ( !conversionSuccess )
{
srsDimension = 2;
}
}
else if ( elem.hasAttribute( QStringLiteral( "dimension" ) ) )
{
srsDimension = elem.attribute( QStringLiteral( "dimension" ) ).toInt( &conversionSuccess );
if ( !conversionSuccess )
{
srsDimension = 2;
}
}
for ( int i = 0; i < posSize / srsDimension; i++ )
{
x = pos.at( i * srsDimension ).toDouble( &conversionSuccess );
if ( !conversionSuccess )
{
return true;
}
y = pos.at( i * srsDimension + 1 ).toDouble( &conversionSuccess );
if ( !conversionSuccess )
{
return true;
}
coords.push_back( QgsPointXY( x, y ) );
}
return false;
}
QgsRectangle QgsOgcUtils::rectangleFromGMLEnvelope( const QDomNode &envelopeNode )
{
QgsRectangle rect;
QDomElement envelopeElem = envelopeNode.toElement();
if ( envelopeElem.tagName() != QLatin1String( "Envelope" ) )
return rect;
QDomNodeList lowerCornerList = envelopeElem.elementsByTagNameNS( GML_NAMESPACE, QStringLiteral( "lowerCorner" ) );
if ( lowerCornerList.size() < 1 )
return rect;
QDomNodeList upperCornerList = envelopeElem.elementsByTagNameNS( GML_NAMESPACE, QStringLiteral( "upperCorner" ) );
if ( upperCornerList.size() < 1 )
return rect;
bool conversionSuccess;
int srsDimension = 2;
QDomElement elem = lowerCornerList.at( 0 ).toElement();
if ( elem.hasAttribute( QStringLiteral( "srsDimension" ) ) )
{
srsDimension = elem.attribute( QStringLiteral( "srsDimension" ) ).toInt( &conversionSuccess );
if ( !conversionSuccess )
{
srsDimension = 2;
}
}
else if ( elem.hasAttribute( QStringLiteral( "dimension" ) ) )
{
srsDimension = elem.attribute( QStringLiteral( "dimension" ) ).toInt( &conversionSuccess );
if ( !conversionSuccess )
{
srsDimension = 2;
}
}