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qgscoordinatetransform.cpp
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qgscoordinatetransform.cpp
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/***************************************************************************
QgsCoordinateTransform.cpp - Coordinate Transforms
-------------------
begin : Dec 2004
copyright : (C) 2004 Tim Sutton
email : tim at linfiniti.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 "qgscoordinatetransform.h"
#include "qgsapplication.h"
#include "qgscrscache.h"
#include "qgsmessagelog.h"
#include "qgslogger.h"
//qt includes
#include <QDomNode>
#include <QDomElement>
#include <QApplication>
#include <QPolygonF>
#include <QStringList>
#include <QVector>
extern "C"
{
#include <proj_api.h>
}
#include <sqlite3.h>
// if defined shows all information about transform to stdout
// #define COORDINATE_TRANSFORM_VERBOSE
QgsCoordinateTransform::QgsCoordinateTransform()
: QObject()
, mShortCircuit( false )
, mInitialisedFlag( false )
, mSourceProjection( nullptr )
, mDestinationProjection( nullptr )
, mSourceDatumTransform( -1 )
, mDestinationDatumTransform( -1 )
{
setFinder();
}
QgsCoordinateTransform::QgsCoordinateTransform( const QgsCoordinateReferenceSystem& source, const QgsCoordinateReferenceSystem& dest )
: QObject()
, mShortCircuit( false )
, mInitialisedFlag( false )
, mSourceProjection( nullptr )
, mDestinationProjection( nullptr )
, mSourceDatumTransform( -1 )
, mDestinationDatumTransform( -1 )
{
setFinder();
mSourceCRS = source;
mDestCRS = dest;
initialise();
}
QgsCoordinateTransform::QgsCoordinateTransform( long theSourceSrsId, long theDestSrsId )
: QObject()
, mInitialisedFlag( false )
, mSourceCRS( theSourceSrsId, QgsCoordinateReferenceSystem::InternalCrsId )
, mDestCRS( theDestSrsId, QgsCoordinateReferenceSystem::InternalCrsId )
, mSourceProjection( nullptr )
, mDestinationProjection( nullptr )
, mSourceDatumTransform( -1 )
, mDestinationDatumTransform( -1 )
{
initialise();
}
QgsCoordinateTransform::QgsCoordinateTransform( const QString& theSourceCRS, const QString& theDestCRS )
: QObject()
, mInitialisedFlag( false )
, mSourceProjection( nullptr )
, mDestinationProjection( nullptr )
, mSourceDatumTransform( -1 )
, mDestinationDatumTransform( -1 )
{
setFinder();
mSourceCRS.createFromWkt( theSourceCRS );
mDestCRS.createFromWkt( theDestCRS );
// initialize the coordinate system data structures
//XXX Who spells initialize initialise?
//XXX A: Its the queen's english....
//XXX : Long live the queen! Lets get on with the initialization...
initialise();
}
QgsCoordinateTransform::QgsCoordinateTransform( long theSourceSrid,
const QString& theDestWkt,
QgsCoordinateReferenceSystem::CrsType theSourceCRSType )
: QObject()
, mInitialisedFlag( false )
, mSourceProjection( nullptr )
, mDestinationProjection( nullptr )
, mSourceDatumTransform( -1 )
, mDestinationDatumTransform( -1 )
{
setFinder();
mSourceCRS.createFromId( theSourceSrid, theSourceCRSType );
mDestCRS.createFromWkt( theDestWkt );
// initialize the coordinate system data structures
//XXX Who spells initialize initialise?
//XXX A: Its the queen's english....
//XXX : Long live the queen! Lets get on with the initialization...
initialise();
}
QgsCoordinateTransform::~QgsCoordinateTransform()
{
// free the proj objects
if ( mSourceProjection )
{
pj_free( mSourceProjection );
}
if ( mDestinationProjection )
{
pj_free( mDestinationProjection );
}
}
QgsCoordinateTransform* QgsCoordinateTransform::clone() const
{
QgsCoordinateTransform* tr = new QgsCoordinateTransform( sourceCrs(), destCRS() );
tr->setSourceDatumTransform( sourceDatumTransform() );
tr->setDestinationDatumTransform( destinationDatumTransform() );
tr->initialise();
return tr;
}
void QgsCoordinateTransform::setSourceCrs( const QgsCoordinateReferenceSystem& theCRS )
{
mSourceCRS = theCRS;
initialise();
}
void QgsCoordinateTransform::setDestCRS( const QgsCoordinateReferenceSystem& theCRS )
{
mDestCRS = theCRS;
initialise();
}
void QgsCoordinateTransform::setDestCRSID( long theCRSID )
{
//!todo Add some logic here to determine if the srsid is a system or user one
mDestCRS.createFromSrsId( theCRSID );
initialise();
}
// XXX This whole function is full of multiple return statements!!!
// And probably shouldn't be a void
void QgsCoordinateTransform::initialise()
{
// XXX Warning - multiple return paths in this block!!
if ( !mSourceCRS.isValid() )
{
//mSourceCRS = defaultWkt;
// Pass through with no projection since we have no idea what the layer
// coordinates are and projecting them may not be appropriate
mShortCircuit = true;
QgsDebugMsg( "SourceCRS seemed invalid!" );
return;
}
if ( !mDestCRS.isValid() )
{
//No destination projection is set so we set the default output projection to
//be the same as input proj.
mDestCRS = QgsCRSCache::instance()->crsByOgcWmsCrs( mSourceCRS.authid() );
}
bool useDefaultDatumTransform = ( mSourceDatumTransform == - 1 && mDestinationDatumTransform == -1 );
// init the projections (destination and source)
pj_free( mSourceProjection );
QString sourceProjString = mSourceCRS.toProj4();
if ( !useDefaultDatumTransform )
{
sourceProjString = stripDatumTransform( sourceProjString );
}
if ( mSourceDatumTransform != -1 )
{
sourceProjString += ( ' ' + datumTransformString( mSourceDatumTransform ) );
}
pj_free( mDestinationProjection );
QString destProjString = mDestCRS.toProj4();
if ( !useDefaultDatumTransform )
{
destProjString = stripDatumTransform( destProjString );
}
if ( mDestinationDatumTransform != -1 )
{
destProjString += ( ' ' + datumTransformString( mDestinationDatumTransform ) );
}
if ( !useDefaultDatumTransform )
{
addNullGridShifts( sourceProjString, destProjString );
}
mSourceProjection = pj_init_plus( sourceProjString.toUtf8() );
mDestinationProjection = pj_init_plus( destProjString.toUtf8() );
#ifdef COORDINATE_TRANSFORM_VERBOSE
QgsDebugMsg( "From proj : " + mSourceCRS.toProj4() );
QgsDebugMsg( "To proj : " + mDestCRS.toProj4() );
#endif
mInitialisedFlag = true;
if ( !mDestinationProjection )
{
mInitialisedFlag = false;
}
if ( !mSourceProjection )
{
mInitialisedFlag = false;
}
#ifdef COORDINATE_TRANSFORM_VERBOSE
if ( mInitialisedFlag )
{
QgsDebugMsg( "------------------------------------------------------------" );
QgsDebugMsg( "The OGR Coordinate transformation for this layer was set to" );
QgsLogger::debug<QgsCoordinateReferenceSystem>( "Input", mSourceCRS, __FILE__, __FUNCTION__, __LINE__ );
QgsLogger::debug<QgsCoordinateReferenceSystem>( "Output", mDestCRS, __FILE__, __FUNCTION__, __LINE__ );
QgsDebugMsg( "------------------------------------------------------------" );
}
else
{
QgsDebugMsg( "------------------------------------------------------------" );
QgsDebugMsg( "The OGR Coordinate transformation FAILED TO INITIALISE!" );
QgsDebugMsg( "------------------------------------------------------------" );
}
#else
if ( !mInitialisedFlag )
{
QgsDebugMsg( "Coordinate transformation failed to initialize!" );
}
#endif
//XXX todo overload == operator for QgsCoordinateReferenceSystem
//at the moment srs.parameters contains the whole proj def...soon it wont...
//if (mSourceCRS->toProj4() == mDestCRS->toProj4())
if ( mSourceCRS == mDestCRS )
{
// If the source and destination projection are the same, set the short
// circuit flag (no transform takes place)
mShortCircuit = true;
QgsDebugMsgLevel( "Source/Dest CRS equal, shortcircuit is set.", 3 );
}
else
{
// Transform must take place
mShortCircuit = false;
QgsDebugMsgLevel( "Source/Dest CRS UNequal, shortcircuit is NOt set.", 3 );
}
}
//
//
// TRANSFORMERS BELOW THIS POINT .........
//
//
//
QgsPoint QgsCoordinateTransform::transform( const QgsPoint &thePoint, TransformDirection direction ) const
{
if ( mShortCircuit || !mInitialisedFlag )
return thePoint;
// transform x
double x = thePoint.x();
double y = thePoint.y();
double z = 0.0;
try
{
transformCoords( 1, &x, &y, &z, direction );
}
catch ( const QgsCsException & )
{
// rethrow the exception
QgsDebugMsg( "rethrowing exception" );
throw;
}
return QgsPoint( x, y );
}
QgsPoint QgsCoordinateTransform::transform( const double theX, const double theY = 0.0, TransformDirection direction ) const
{
try
{
return transform( QgsPoint( theX, theY ), direction );
}
catch ( const QgsCsException & )
{
// rethrow the exception
QgsDebugMsg( "rethrowing exception" );
throw;
}
}
QgsRectangle QgsCoordinateTransform::transform( const QgsRectangle &theRect, TransformDirection direction ) const
{
if ( mShortCircuit || !mInitialisedFlag )
return theRect;
// transform x
double x1 = theRect.xMinimum();
double y1 = theRect.yMinimum();
double x2 = theRect.xMaximum();
double y2 = theRect.yMaximum();
// Number of points to reproject------+
// |
// V
try
{
double z = 0.0;
transformCoords( 1, &x1, &y1, &z, direction );
transformCoords( 1, &x2, &y2, &z, direction );
}
catch ( const QgsCsException & )
{
// rethrow the exception
QgsDebugMsg( "rethrowing exception" );
throw;
}
#ifdef COORDINATE_TRANSFORM_VERBOSE
QgsDebugMsg( "Rect projection..." );
QgsDebugMsg( QString( "Xmin : %1 --> %2" ).arg( theRect.xMinimum() ).arg( x1 ) );
QgsDebugMsg( QString( "Ymin : %1 --> %2" ).arg( theRect.yMinimum() ).arg( y1 ) );
QgsDebugMsg( QString( "Xmax : %1 --> %2" ).arg( theRect.xMaximum() ).arg( x2 ) );
QgsDebugMsg( QString( "Ymax : %1 --> %2" ).arg( theRect.yMaximum() ).arg( y2 ) );
#endif
return QgsRectangle( x1, y1, x2, y2 );
}
void QgsCoordinateTransform::transformInPlace( double& x, double& y, double& z,
TransformDirection direction ) const
{
if ( mShortCircuit || !mInitialisedFlag )
return;
#ifdef QGISDEBUG
// QgsDebugMsg(QString("Using transform in place %1 %2").arg(__FILE__).arg(__LINE__));
#endif
// transform x
try
{
transformCoords( 1, &x, &y, &z, direction );
}
catch ( const QgsCsException & )
{
// rethrow the exception
QgsDebugMsg( "rethrowing exception" );
throw;
}
}
void QgsCoordinateTransform::transformInPlace( float& x, float& y, double& z,
TransformDirection direction ) const
{
double xd = static_cast< double >( x ), yd = static_cast< double >( y );
transformInPlace( xd, yd, z, direction );
x = xd;
y = yd;
}
void QgsCoordinateTransform::transformInPlace( float& x, float& y, float& z,
TransformDirection direction ) const
{
if ( mShortCircuit || !mInitialisedFlag )
return;
#ifdef QGISDEBUG
// QgsDebugMsg(QString("Using transform in place %1 %2").arg(__FILE__).arg(__LINE__));
#endif
// transform x
try
{
double xd = x;
double yd = y;
double zd = z;
transformCoords( 1, &xd, &yd, &zd, direction );
x = xd;
y = yd;
z = zd;
}
catch ( QgsCsException & )
{
// rethrow the exception
QgsDebugMsg( "rethrowing exception" );
throw;
}
}
void QgsCoordinateTransform::transformPolygon( QPolygonF& poly, TransformDirection direction ) const
{
if ( mShortCircuit || !mInitialisedFlag )
{
return;
}
//create x, y arrays
int nVertices = poly.size();
QVector<double> x( nVertices );
QVector<double> y( nVertices );
QVector<double> z( nVertices );
for ( int i = 0; i < nVertices; ++i )
{
const QPointF& pt = poly.at( i );
x[i] = pt.x();
y[i] = pt.y();
z[i] = 0;
}
try
{
transformCoords( nVertices, x.data(), y.data(), z.data(), direction );
}
catch ( const QgsCsException & )
{
// rethrow the exception
QgsDebugMsg( "rethrowing exception" );
throw;
}
for ( int i = 0; i < nVertices; ++i )
{
QPointF& pt = poly[i];
pt.rx() = x[i];
pt.ry() = y[i];
}
}
void QgsCoordinateTransform::transformInPlace(
QVector<double>& x, QVector<double>& y, QVector<double>& z,
TransformDirection direction ) const
{
if ( mShortCircuit || !mInitialisedFlag )
return;
Q_ASSERT( x.size() == y.size() );
// Apparently, if one has a std::vector, it is valid to use the
// address of the first element in the vector as a pointer to an
// array of the vectors data, and hence easily interface with code
// that wants C-style arrays.
try
{
transformCoords( x.size(), &x[0], &y[0], &z[0], direction );
}
catch ( const QgsCsException & )
{
// rethrow the exception
QgsDebugMsg( "rethrowing exception" );
throw;
}
}
void QgsCoordinateTransform::transformInPlace(
QVector<float>& x, QVector<float>& y, QVector<float>& z,
TransformDirection direction ) const
{
if ( mShortCircuit || !mInitialisedFlag )
return;
Q_ASSERT( x.size() == y.size() );
// Apparently, if one has a std::vector, it is valid to use the
// address of the first element in the vector as a pointer to an
// array of the vectors data, and hence easily interface with code
// that wants C-style arrays.
try
{
//copy everything to double vectors since proj needs double
int vectorSize = x.size();
QVector<double> xd( x.size() );
QVector<double> yd( y.size() );
QVector<double> zd( z.size() );
for ( int i = 0; i < vectorSize; ++i )
{
xd[i] = x[i];
yd[i] = y[i];
zd[i] = z[i];
}
transformCoords( x.size(), &xd[0], &yd[0], &zd[0], direction );
//copy back
for ( int i = 0; i < vectorSize; ++i )
{
x[i] = xd[i];
y[i] = yd[i];
z[i] = zd[i];
}
}
catch ( QgsCsException & )
{
// rethrow the exception
QgsDebugMsg( "rethrowing exception" );
throw;
}
}
QgsRectangle QgsCoordinateTransform::transformBoundingBox( const QgsRectangle &rect, TransformDirection direction, const bool handle180Crossover ) const
{
// Calculate the bounding box of a QgsRectangle in the source CRS
// when projected to the destination CRS (or the inverse).
// This is done by looking at a number of points spread evenly
// across the rectangle
if ( mShortCircuit || !mInitialisedFlag )
return rect;
if ( rect.isEmpty() )
{
QgsPoint p = transform( rect.xMinimum(), rect.yMinimum(), direction );
return QgsRectangle( p, p );
}
// 64 points (<=2.12) is not enough, see #13665, for EPSG:4326 -> EPSG:3574 (say that it is a hard one),
// are decent result from about 500 points and more. This method is called quite often, but
// even with 1000 points it takes < 1ms
// TODO: how to effectively and precisely reproject bounding box?
const int nPoints = 1000;
double d = sqrt(( rect.width() * rect.height() ) / pow( sqrt( static_cast< double >( nPoints ) ) - 1, 2.0 ) );
int nXPoints = static_cast< int >( ceil( rect.width() / d ) ) + 1;
int nYPoints = static_cast< int >( ceil( rect.height() / d ) ) + 1;
QgsRectangle bb_rect;
bb_rect.setMinimal();
// We're interfacing with C-style vectors in the
// end, so let's do C-style vectors here too.
QVector<double> x( nXPoints * nYPoints );
QVector<double> y( nXPoints * nYPoints );
QVector<double> z( nXPoints * nYPoints );
QgsDebugMsg( "Entering transformBoundingBox..." );
// Populate the vectors
double dx = rect.width() / static_cast< double >( nXPoints - 1 );
double dy = rect.height() / static_cast< double >( nYPoints - 1 );
double pointY = rect.yMinimum();
for ( int i = 0; i < nYPoints ; i++ )
{
// Start at right edge
double pointX = rect.xMinimum();
for ( int j = 0; j < nXPoints; j++ )
{
x[( i*nXPoints ) + j] = pointX;
y[( i*nXPoints ) + j] = pointY;
// and the height...
z[( i*nXPoints ) + j] = 0.0;
// QgsDebugMsg(QString("BBox coord: (%1, %2)").arg(x[(i*numP) + j]).arg(y[(i*numP) + j]));
pointX += dx;
}
pointY += dy;
}
// Do transformation. Any exception generated must
// be handled in above layers.
try
{
transformCoords( nXPoints * nYPoints, x.data(), y.data(), z.data(), direction );
}
catch ( const QgsCsException & )
{
// rethrow the exception
QgsDebugMsg( "rethrowing exception" );
throw;
}
// Calculate the bounding box and use that for the extent
for ( int i = 0; i < nXPoints * nYPoints; i++ )
{
if ( !qIsFinite( x[i] ) || !qIsFinite( y[i] ) )
{
continue;
}
if ( handle180Crossover )
{
//if crossing the date line, temporarily add 360 degrees to -ve longitudes
bb_rect.combineExtentWith( x[i] >= 0.0 ? x[i] : x[i] + 360.0, y[i] );
}
else
{
bb_rect.combineExtentWith( x[i], y[i] );
}
}
if ( handle180Crossover )
{
//subtract temporary addition of 360 degrees from longitudes
if ( bb_rect.xMinimum() > 180.0 )
bb_rect.setXMinimum( bb_rect.xMinimum() - 360.0 );
if ( bb_rect.xMaximum() > 180.0 )
bb_rect.setXMaximum( bb_rect.xMaximum() - 360.0 );
}
QgsDebugMsg( "Projected extent: " + bb_rect.toString() );
if ( bb_rect.isEmpty() )
{
QgsDebugMsg( "Original extent: " + rect.toString() );
}
return bb_rect;
}
void QgsCoordinateTransform::transformCoords( int numPoints, double *x, double *y, double *z, TransformDirection direction ) const
{
if ( mShortCircuit || !mInitialisedFlag )
return;
// Refuse to transform the points if the srs's are invalid
if ( !mSourceCRS.isValid() )
{
QgsMessageLog::logMessage( tr( "The source spatial reference system (CRS) is not valid. "
"The coordinates can not be reprojected. The CRS is: %1" )
.arg( mSourceCRS.toProj4() ), tr( "CRS" ) );
return;
}
if ( !mDestCRS.isValid() )
{
QgsMessageLog::logMessage( tr( "The destination spatial reference system (CRS) is not valid. "
"The coordinates can not be reprojected. The CRS is: %1" ).arg( mDestCRS.toProj4() ), tr( "CRS" ) );
return;
}
#ifdef COORDINATE_TRANSFORM_VERBOSE
double xorg = *x;
double yorg = *y;
QgsDebugMsg( QString( "[[[[[[ Number of points to transform: %1 ]]]]]]" ).arg( numPoints ) );
#endif
// use proj4 to do the transform
QString dir;
// if the source/destination projection is lat/long, convert the points to radians
// prior to transforming
if (( pj_is_latlong( mDestinationProjection ) && ( direction == ReverseTransform ) )
|| ( pj_is_latlong( mSourceProjection ) && ( direction == ForwardTransform ) ) )
{
for ( int i = 0; i < numPoints; ++i )
{
x[i] *= DEG_TO_RAD;
y[i] *= DEG_TO_RAD;
z[i] *= DEG_TO_RAD;
}
}
int projResult;
if ( direction == ReverseTransform )
{
projResult = pj_transform( mDestinationProjection, mSourceProjection, numPoints, 0, x, y, z );
}
else
{
Q_ASSERT( mSourceProjection );
Q_ASSERT( mDestinationProjection );
projResult = pj_transform( mSourceProjection, mDestinationProjection, numPoints, 0, x, y, z );
}
if ( projResult != 0 )
{
//something bad happened....
QString points;
for ( int i = 0; i < numPoints; ++i )
{
if ( direction == ForwardTransform )
{
points += QString( "(%1, %2)\n" ).arg( x[i], 0, 'f' ).arg( y[i], 0, 'f' );
}
else
{
points += QString( "(%1, %2)\n" ).arg( x[i] * RAD_TO_DEG, 0, 'f' ).arg( y[i] * RAD_TO_DEG, 0, 'f' );
}
}
dir = ( direction == ForwardTransform ) ? tr( "forward transform" ) : tr( "inverse transform" );
char *srcdef = pj_get_def( mSourceProjection, 0 );
char *dstdef = pj_get_def( mDestinationProjection, 0 );
QString msg = tr( "%1 of\n"
"%2"
"PROJ.4: %3 +to %4\n"
"Error: %5" )
.arg( dir,
points,
srcdef, dstdef,
QString::fromUtf8( pj_strerrno( projResult ) ) );
pj_dalloc( srcdef );
pj_dalloc( dstdef );
QgsDebugMsg( "Projection failed emitting invalid transform signal: " + msg );
emit invalidTransformInput();
QgsDebugMsg( "throwing exception" );
throw QgsCsException( msg );
}
// if the result is lat/long, convert the results from radians back
// to degrees
if (( pj_is_latlong( mDestinationProjection ) && ( direction == ForwardTransform ) )
|| ( pj_is_latlong( mSourceProjection ) && ( direction == ReverseTransform ) ) )
{
for ( int i = 0; i < numPoints; ++i )
{
x[i] *= RAD_TO_DEG;
y[i] *= RAD_TO_DEG;
z[i] *= RAD_TO_DEG;
}
}
#ifdef COORDINATE_TRANSFORM_VERBOSE
QgsDebugMsg( QString( "[[[[[[ Projected %1, %2 to %3, %4 ]]]]]]" )
.arg( xorg, 0, 'g', 15 ).arg( yorg, 0, 'g', 15 )
.arg( *x, 0, 'g', 15 ).arg( *y, 0, 'g', 15 ) );
#endif
}
bool QgsCoordinateTransform::readXML( QDomNode & theNode )
{
QgsDebugMsg( "Reading Coordinate Transform from xml ------------------------!" );
QDomNode mySrcNode = theNode.namedItem( "sourcesrs" );
mSourceCRS.readXML( mySrcNode );
QDomNode myDestNode = theNode.namedItem( "destinationsrs" );
mDestCRS.readXML( myDestNode );
mSourceDatumTransform = theNode.toElement().attribute( "sourceDatumTransform", "-1" ).toInt();
mDestinationDatumTransform = theNode.toElement().attribute( "destinationDatumTransform", "-1" ).toInt();
initialise();
return true;
}
bool QgsCoordinateTransform::writeXML( QDomNode & theNode, QDomDocument & theDoc )
{
QDomElement myNodeElement = theNode.toElement();
QDomElement myTransformElement = theDoc.createElement( "coordinatetransform" );
myTransformElement.setAttribute( "sourceDatumTransform", QString::number( mSourceDatumTransform ) );
myTransformElement.setAttribute( "destinationDatumTransform", QString::number( mDestinationDatumTransform ) );
QDomElement mySourceElement = theDoc.createElement( "sourcesrs" );
mSourceCRS.writeXML( mySourceElement, theDoc );
myTransformElement.appendChild( mySourceElement );
QDomElement myDestElement = theDoc.createElement( "destinationsrs" );
mDestCRS.writeXML( myDestElement, theDoc );
myTransformElement.appendChild( myDestElement );
myNodeElement.appendChild( myTransformElement );
return true;
}
const char *finder( const char *name )
{
QString proj;
#ifdef Q_OS_WIN
proj = QApplication::applicationDirPath()
+ "/share/proj/" + QString( name );
#else
Q_UNUSED( name );
#endif
return proj.toUtf8();
}
void QgsCoordinateTransform::setFinder()
{
#if 0
// Attention! It should be possible to set PROJ_LIB
// but it can happen that it was previously set by installer
// (version 0.7) and the old installation was deleted
// Another problem: PROJ checks if pj_finder was set before
// PROJ_LIB environment variable. pj_finder is probably set in
// GRASS gproj library when plugin is loaded, consequently
// PROJ_LIB is ignored
pj_set_finder( finder );
#endif
}
QList< QList< int > > QgsCoordinateTransform::datumTransformations( const QgsCoordinateReferenceSystem& srcCRS, const QgsCoordinateReferenceSystem& destCRS )
{
QList< QList< int > > transformations;
QString srcGeoId = srcCRS.geographicCRSAuthId();
QString destGeoId = destCRS.geographicCRSAuthId();
if ( srcGeoId.isEmpty() || destGeoId.isEmpty() )
{
return transformations;
}
QStringList srcSplit = srcGeoId.split( ':' );
QStringList destSplit = destGeoId.split( ':' );
if ( srcSplit.size() < 2 || destSplit.size() < 2 )
{
return transformations;
}
int srcAuthCode = srcSplit.at( 1 ).toInt();
int destAuthCode = destSplit.at( 1 ).toInt();
if ( srcAuthCode == destAuthCode )
{
return transformations; //crs have the same datum
}
QList<int> directTransforms;
searchDatumTransform( QString( "SELECT coord_op_code FROM tbl_datum_transform WHERE source_crs_code=%1 AND target_crs_code=%2 ORDER BY deprecated ASC,preferred DESC" ).arg( srcAuthCode ).arg( destAuthCode ),
directTransforms );
QList<int> reverseDirectTransforms;
searchDatumTransform( QString( "SELECT coord_op_code FROM tbl_datum_transform WHERE source_crs_code = %1 AND target_crs_code=%2 ORDER BY deprecated ASC,preferred DESC" ).arg( destAuthCode ).arg( srcAuthCode ),
reverseDirectTransforms );
QList<int> srcToWgs84;
searchDatumTransform( QString( "SELECT coord_op_code FROM tbl_datum_transform WHERE (source_crs_code=%1 AND target_crs_code=%2) OR (source_crs_code=%2 AND target_crs_code=%1) ORDER BY deprecated ASC,preferred DESC" ).arg( srcAuthCode ).arg( 4326 ),
srcToWgs84 );
QList<int> destToWgs84;
searchDatumTransform( QString( "SELECT coord_op_code FROM tbl_datum_transform WHERE (source_crs_code=%1 AND target_crs_code=%2) OR (source_crs_code=%2 AND target_crs_code=%1) ORDER BY deprecated ASC,preferred DESC" ).arg( destAuthCode ).arg( 4326 ),
destToWgs84 );
//add direct datum transformations
QList<int>::const_iterator directIt = directTransforms.constBegin();
for ( ; directIt != directTransforms.constEnd(); ++directIt )
{
transformations.push_back( QList<int>() << *directIt << -1 );
}
//add direct datum transformations
directIt = reverseDirectTransforms.constBegin();
for ( ; directIt != reverseDirectTransforms.constEnd(); ++directIt )
{
transformations.push_back( QList<int>() << -1 << *directIt );
}
QList<int>::const_iterator srcWgsIt = srcToWgs84.constBegin();
for ( ; srcWgsIt != srcToWgs84.constEnd(); ++srcWgsIt )
{
QList<int>::const_iterator dstWgsIt = destToWgs84.constBegin();
for ( ; dstWgsIt != destToWgs84.constEnd(); ++dstWgsIt )
{
transformations.push_back( QList<int>() << *srcWgsIt << *dstWgsIt );
}
}
return transformations;
}
QString QgsCoordinateTransform::stripDatumTransform( const QString& proj4 )
{
QStringList parameterSplit = proj4.split( '+', QString::SkipEmptyParts );
QString currentParameter;
QString newProjString;
for ( int i = 0; i < parameterSplit.size(); ++i )
{
currentParameter = parameterSplit.at( i );
if ( !currentParameter.startsWith( "towgs84", Qt::CaseInsensitive )
&& !currentParameter.startsWith( "nadgrids", Qt::CaseInsensitive ) )
{
newProjString.append( '+' );
newProjString.append( currentParameter );
newProjString.append( ' ' );
}
}
return newProjString;
}
void QgsCoordinateTransform::searchDatumTransform( const QString& sql, QList< int >& transforms )
{
sqlite3* db;
int openResult = sqlite3_open_v2( QgsApplication::srsDbFilePath().toUtf8().constData(), &db, SQLITE_OPEN_READONLY, 0 );
if ( openResult != SQLITE_OK )
{
sqlite3_close( db );
return;
}
sqlite3_stmt* stmt;
int prepareRes = sqlite3_prepare( db, sql.toAscii(), sql.size(), &stmt, nullptr );
if ( prepareRes != SQLITE_OK )
{
sqlite3_finalize( stmt );
sqlite3_close( db );
return;
}
QString cOpCode;
while ( sqlite3_step( stmt ) == SQLITE_ROW )
{
cOpCode = reinterpret_cast< const char * >( sqlite3_column_text( stmt, 0 ) );
transforms.push_back( cOpCode.toInt() );
}
sqlite3_finalize( stmt );
sqlite3_close( db );
}
QString QgsCoordinateTransform::datumTransformString( int datumTransform )
{
QString transformString;
sqlite3* db;
int openResult = sqlite3_open_v2( QgsApplication::srsDbFilePath().toUtf8().constData(), &db, SQLITE_OPEN_READONLY, 0 );
if ( openResult != SQLITE_OK )
{
sqlite3_close( db );
return transformString;
}
sqlite3_stmt* stmt;
QString sql = QString( "SELECT coord_op_method_code,p1,p2,p3,p4,p5,p6,p7 FROM tbl_datum_transform WHERE coord_op_code=%1" ).arg( datumTransform );
int prepareRes = sqlite3_prepare( db, sql.toAscii(), sql.size(), &stmt, nullptr );
if ( prepareRes != SQLITE_OK )
{
sqlite3_finalize( stmt );
sqlite3_close( db );
return transformString;
}
if ( sqlite3_step( stmt ) == SQLITE_ROW )
{
//coord_op_methode_code
int methodCode = sqlite3_column_int( stmt, 0 );
if ( methodCode == 9615 ) //ntv2
{
transformString = "+nadgrids=" + QString( reinterpret_cast< const char * >( sqlite3_column_text( stmt, 1 ) ) );
}
else if ( methodCode == 9603 || methodCode == 9606 || methodCode == 9607 )
{
transformString += "+towgs84=";
double p1 = sqlite3_column_double( stmt, 1 );
double p2 = sqlite3_column_double( stmt, 2 );
double p3 = sqlite3_column_double( stmt, 3 );
double p4 = sqlite3_column_double( stmt, 4 );
double p5 = sqlite3_column_double( stmt, 5 );
double p6 = sqlite3_column_double( stmt, 6 );
double p7 = sqlite3_column_double( stmt, 7 );
if ( methodCode == 9603 ) //3 parameter transformation
{
transformString += QString( "%1,%2,%3" ).arg( p1 ).arg( p2 ).arg( p3 );
}
else //7 parameter transformation
{
transformString += QString( "%1,%2,%3,%4,%5,%6,%7" ).arg( p1 ).arg( p2 ).arg( p3 ).arg( p4 ).arg( p5 ).arg( p6 ).arg( p7 );
}
}
}
sqlite3_finalize( stmt );
sqlite3_close( db );
return transformString;
}
bool QgsCoordinateTransform::datumTransformCrsInfo( int datumTransform, int& epsgNr, QString& srcProjection, QString& dstProjection, QString &remarks, QString &scope, bool &preferred, bool &deprecated )
{
sqlite3* db;
int openResult = sqlite3_open_v2( QgsApplication::srsDbFilePath().toUtf8().constData(), &db, SQLITE_OPEN_READONLY, 0 );
if ( openResult != SQLITE_OK )
{
sqlite3_close( db );
return false;
}
sqlite3_stmt* stmt;
QString sql = QString( "SELECT epsg_nr,source_crs_code,target_crs_code,remarks,scope,preferred,deprecated FROM tbl_datum_transform WHERE coord_op_code=%1" ).arg( datumTransform );