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qgscoordinatereferencesystem.cpp
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qgscoordinatereferencesystem.cpp
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/***************************************************************************
qgscoordinatereferencesystem.cpp
-------------------
begin : 2007
copyright : (C) 2007 by Gary E. Sherman
email : sherman@mrcc.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 "qgscoordinatereferencesystem.h"
#include <cmath>
#include <QDir>
#include <QDomNode>
#include <QDomElement>
#include <QFileInfo>
#include <QRegExp>
#include <QTextStream>
#include "qgsapplication.h"
#include "qgslogger.h"
#include "qgsmessageoutput.h"
#include "qgis.h" //const vals declared here
#include <cassert>
#include <sqlite3.h>
//gdal and ogr includes (needed for == operator)
#include <ogr_srs_api.h>
#include <cpl_error.h>
#include <cpl_conv.h>
#include "qgslogger.h"
CUSTOM_CRS_VALIDATION QgsCoordinateReferenceSystem::mCustomSrsValidation = NULL;
//--------------------------
QgsCoordinateReferenceSystem::QgsCoordinateReferenceSystem()
: mMapUnits( QGis::UnknownUnit ),
mIsValidFlag( 0 ),
mValidationHint( 0 )
{
mCRS = OSRNewSpatialReference( NULL );
}
QgsCoordinateReferenceSystem::QgsCoordinateReferenceSystem( QString theWkt )
: mMapUnits( QGis::UnknownUnit ),
mIsValidFlag( 0 ),
mValidationHint( 0 )
{
mCRS = OSRNewSpatialReference( NULL );
createFromWkt( theWkt );
}
QgsCoordinateReferenceSystem::QgsCoordinateReferenceSystem( const long theId, CrsType theType )
: mMapUnits( QGis::UnknownUnit ),
mIsValidFlag( 0 ),
mValidationHint( 0 )
{
mCRS = OSRNewSpatialReference( NULL );
createFromId( theId, theType );
}
QgsCoordinateReferenceSystem::~QgsCoordinateReferenceSystem()
{
OSRDestroySpatialReference( mCRS );
}
void QgsCoordinateReferenceSystem::createFromId( const long theId, CrsType theType )
{
switch ( theType )
{
case InternalCrsId:
createFromSrsId( theId );
break;
case PostgisCrsId:
createFromSrid( theId );
break;
case EpsgCrsId:
createFromEpsg( theId );
break;
default:
//THIS IS BAD...THIS PART OF CODE SHOULD NEVER BE REACHED...
QgsDebugMsg( "Unexpected case reached!" );
};
}
bool QgsCoordinateReferenceSystem::createFromOgcWmsCrs( QString theCrs )
{
if ( loadFromDb( QgsApplication::srsDbFilePath(), "lower(auth_name||':'||auth_id)", theCrs.toLower() ) )
return true;
if ( theCrs.compare( "CRS:84", Qt::CaseInsensitive ) == 0 )
{
createFromSrsId( GEOCRS_ID );
return true;
}
return false;
}
QgsCoordinateReferenceSystem::QgsCoordinateReferenceSystem( const QgsCoordinateReferenceSystem &srs )
{
mCRS = OSRNewSpatialReference( NULL );
*this = srs;
}
// Assignment operator
QgsCoordinateReferenceSystem& QgsCoordinateReferenceSystem::operator=( const QgsCoordinateReferenceSystem & srs )
{
if ( &srs != this )
{
mSrsId = srs.mSrsId;
mDescription = srs.mDescription;
mProjectionAcronym = srs.mProjectionAcronym;
mEllipsoidAcronym = srs.mEllipsoidAcronym;
mGeoFlag = srs.mGeoFlag;
mMapUnits = srs.mMapUnits;
mSRID = srs.mSRID;
mAuthId = srs.mAuthId;
mIsValidFlag = srs.mIsValidFlag;
mValidationHint = srs.mValidationHint;
if ( mIsValidFlag )
{
OSRDestroySpatialReference( mCRS );
mCRS = OSRClone( srs.mCRS );
}
}
return *this;
}
// Misc helper functions -----------------------
void QgsCoordinateReferenceSystem::validate()
{
if ( mIsValidFlag )
return;
// try to validate using custom validation routines
if ( mCustomSrsValidation )
mCustomSrsValidation( this );
if ( !mIsValidFlag )
// set the default
createFromProj4( GEOPROJ4 );
}
bool QgsCoordinateReferenceSystem::createFromSrid( long id )
{
return loadFromDb( QgsApplication::srsDbFilePath(), "srid", QString::number( id ) );
}
bool QgsCoordinateReferenceSystem::createFromEpsg( long id )
{
return createFromOgcWmsCrs( QString( "EPSG:%1" ).arg( id ) );
}
bool QgsCoordinateReferenceSystem::createFromSrsId( long id )
{
return loadFromDb( id < 100000 ? QgsApplication::srsDbFilePath() :
QgsApplication::qgisUserDbFilePath(), "srs_id", QString::number( id ) );
}
bool QgsCoordinateReferenceSystem::loadFromDb( QString db, QString expression, QString value )
{
QgsDebugMsgLevel( "load CRS from " + db + " where " + expression + " is " + value, 3 );
mIsValidFlag = false;
QFileInfo myInfo( db );
if ( !myInfo.exists() )
{
QgsDebugMsg( "failed : " + db + " does not exist!" );
return mIsValidFlag;
}
sqlite3 *myDatabase;
const char *myTail;
sqlite3_stmt *myPreparedStatement;
int myResult;
//check the db is available
myResult = openDb( db, &myDatabase );
if ( myResult )
{
QgsDebugMsg( "failed : " + db + " could not be opened!" );
return mIsValidFlag;
}
/*
srs_id INTEGER PRIMARY KEY,
description text NOT NULL,
projection_acronym text NOT NULL,
ellipsoid_acronym NOT NULL,
parameters text NOT NULL,
srid integer NOT NULL,
auth_name varchar NOT NULL,
auth_id integer NOT NULL,
is_geo integer NOT NULL);
*/
QString mySql = "select srs_id,description,projection_acronym,ellipsoid_acronym,parameters,srid,auth_name||':'||auth_id,is_geo from tbl_srs where " + expression + "='" + value + "'";
myResult = sqlite3_prepare( myDatabase, mySql.toUtf8(), mySql.toUtf8().length(), &myPreparedStatement, &myTail );
// XXX Need to free memory from the error msg if one is set
if ( myResult == SQLITE_OK && sqlite3_step( myPreparedStatement ) == SQLITE_ROW )
{
mSrsId = QString::fromUtf8(( char * )sqlite3_column_text( myPreparedStatement, 0 ) ).toLong();
mDescription = QString::fromUtf8(( char * )sqlite3_column_text( myPreparedStatement, 1 ) );
mProjectionAcronym = QString::fromUtf8(( char * )sqlite3_column_text( myPreparedStatement, 2 ) );
mEllipsoidAcronym = QString::fromUtf8(( char * )sqlite3_column_text( myPreparedStatement, 3 ) );
QString toProj4 = QString::fromUtf8(( char * )sqlite3_column_text( myPreparedStatement, 4 ) );
mSRID = QString::fromUtf8(( char * )sqlite3_column_text( myPreparedStatement, 5 ) ).toLong();
mAuthId = QString::fromUtf8(( char * )sqlite3_column_text( myPreparedStatement, 6 ) );
int geo = QString::fromUtf8(( char * )sqlite3_column_text( myPreparedStatement, 7 ) ).toInt();
mGeoFlag = ( geo == 0 ? false : true );
setProj4String( toProj4 );
setMapUnits();
}
else
{
QgsDebugMsg( "failed : " + mySql );
}
sqlite3_finalize( myPreparedStatement );
sqlite3_close( myDatabase );
return mIsValidFlag;
}
bool QgsCoordinateReferenceSystem::createFromWkt( QString theWkt )
{
mIsValidFlag = false;
if ( theWkt.isEmpty() )
{
QgsDebugMsg( "theWkt is uninitialised, operation failed" );
return mIsValidFlag;
}
QgsDebugMsg( "QgsCoordinateReferenceSystem::createFromWkt(QString theWkt) using: " + theWkt );
QByteArray ba = theWkt.toLatin1();
const char *pWkt = ba;
OGRErr myInputResult = OSRImportFromWkt( mCRS, ( char ** ) & pWkt );
if ( myInputResult != OGRERR_NONE )
{
QgsDebugMsg( "\n---------------------------------------------------------------" );
QgsDebugMsg( "This CRS could *** NOT *** be set from the supplied Wkt " );
QgsDebugMsg( "INPUT: " + theWkt );
QgsDebugMsg( "---------------------------------------------------------------\n" );
return mIsValidFlag;
}
// always morph from esri as it doesn't hurt anything
// FW: Hey, that's not right! It can screw stuff up! Disable
//myOgrSpatialRef.morphFromESRI();
// create the proj4 structs needed for transforming
char *proj4src = NULL;
OSRExportToProj4( mCRS, &proj4src );
//now that we have the proj4string, delegate to createFromProj4String so
// that we can try to fill in the remaining class members...
//create from Proj will set the isValidFlag
createFromProj4( QString( proj4src ) );
CPLFree( proj4src );
return mIsValidFlag;
//setMapunits will be called by createfromproj above
}
bool QgsCoordinateReferenceSystem::isValid() const
{
return mIsValidFlag;
}
bool QgsCoordinateReferenceSystem::createFromProj4( const QString theProj4String )
{
//
// Examples:
// +proj=tmerc +lat_0=0 +lon_0=-62 +k=0.999500 +x_0=400000 +y_0=0
// +ellps=clrk80 +towgs84=-255,-15,71,0,0,0,0 +units=m +no_defs
//
// +proj=lcc +lat_1=46.8 +lat_0=46.8 +lon_0=2.337229166666664 +k_0=0.99987742
// +x_0=600000 +y_0=2200000 +a=6378249.2 +b=6356515.000000472 +units=m +no_defs
//
mIsValidFlag = false;
QRegExp myProjRegExp( "\\+proj=\\S+" );
int myStart = 0;
int myLength = 0;
myStart = myProjRegExp.indexIn( theProj4String, myStart );
if ( myStart == -1 )
{
QgsDebugMsg( "error proj string supplied has no +proj argument" );
return mIsValidFlag;
}
else
{
myLength = myProjRegExp.matchedLength();
}
mProjectionAcronym = theProj4String.mid( myStart + PROJ_PREFIX_LEN, myLength - PROJ_PREFIX_LEN );
QRegExp myEllipseRegExp( "\\+ellps=\\S+" );
myStart = 0;
myLength = 0;
myStart = myEllipseRegExp.indexIn( theProj4String, myStart );
if ( myStart != -1 )
{
myLength = myEllipseRegExp.matchedLength();
mEllipsoidAcronym = theProj4String.mid( myStart + ELLPS_PREFIX_LEN, myLength - ELLPS_PREFIX_LEN );
}
QRegExp myAxisRegExp( "\\+a=\\S+" );
myStart = 0;
myLength = 0;
myStart = myAxisRegExp.indexIn( theProj4String, myStart );
if ( myStart == -1 && mEllipsoidAcronym.isNull() )
{
QgsDebugMsg( "proj string supplied has no +ellps or +a argument" );
return mIsValidFlag;
}
/*
* We try to match the proj string to and srsid using the following logic:
*
* - perform a whole text search on srs name (if not null). The srs name will
* have been set if this method has been delegated to from createFromWkt.
* Normally we wouldnt expect this to work, but its worth trying first
* as its quicker than methods below..
*/
long mySrsId = 0;
QgsCoordinateReferenceSystem::RecordMap myRecord;
// *** Matching on descriptions feels iffy. Different projs can have same description. Homann ***
// if ( !mDescription.trimmed().isEmpty() )
//{
// myRecord = getRecord( "select * from tbl_srs where description='" + mDescription.trimmed() + "'" );
//}
/*
* - if the above does not match perform a whole text search on proj4 string (if not null)
*/
// QgsDebugMsg( "wholetext match on name failed, trying proj4string match" );
myRecord = getRecord( "select * from tbl_srs where parameters='" + theProj4String.trimmed() + "'" );
if ( !myRecord.empty() )
{
mySrsId = myRecord["srs_id"].toLong();
QgsDebugMsg( "proj4string match search for srsid returned srsid: " + QString::number( mySrsId ) );
if ( mySrsId > 0 )
{
createFromSrsId( mySrsId );
}
}
else
{
// Ticket #722 - aaronr
// Check if we can swap the lat_1 and lat_2 params (if they exist) to see if we match...
// First we check for lat_1 and lat_2
QRegExp myLat1RegExp( "\\+lat_1=\\S+" );
QRegExp myLat2RegExp( "\\+lat_2=\\S+" );
int myStart1 = 0;
int myLength1 = 0;
int myStart2 = 0;
int myLength2 = 0;
QString lat1Str = "";
QString lat2Str = "";
myStart1 = myLat1RegExp.indexIn( theProj4String, myStart1 );
myStart2 = myLat2RegExp.indexIn( theProj4String, myStart2 );
if (( myStart1 != -1 ) && ( myStart2 != -1 ) )
{
myLength1 = myLat1RegExp.matchedLength();
myLength2 = myLat2RegExp.matchedLength();
lat1Str = theProj4String.mid( myStart1 + LAT_PREFIX_LEN, myLength1 - LAT_PREFIX_LEN );
lat2Str = theProj4String.mid( myStart2 + LAT_PREFIX_LEN, myLength2 - LAT_PREFIX_LEN );
}
// If we found the lat_1 and lat_2 we need to swap and check to see if we can find it...
if (( lat1Str != "" ) && ( lat2Str != "" ) )
{
// Make our new string to check...
QString theProj4StringModified = theProj4String;
// First just swap in the lat_2 value for lat_1 value
theProj4StringModified.replace( myStart1 + LAT_PREFIX_LEN, myLength1 - LAT_PREFIX_LEN, lat2Str );
// Now we have to find the lat_2 location again since it has potentially moved...
myStart2 = 0;
myStart2 = myLat2RegExp.indexIn( theProj4String, myStart2 );
theProj4StringModified.replace( myStart2 + LAT_PREFIX_LEN, myLength2 - LAT_PREFIX_LEN, lat1Str );
QgsDebugMsg( "trying proj4string match with swapped lat_1,lat_2" );
myRecord = getRecord( "select * from tbl_srs where parameters='" + theProj4StringModified.trimmed() + "'" );
if ( !myRecord.empty() )
{
// Success! We have found the proj string by swapping the lat_1 and lat_2
setProj4String( theProj4StringModified );
mySrsId = myRecord["srs_id"].toLong();
QgsDebugMsg( "proj4string match search for srsid returned srsid: " + QString::number( mySrsId ) );
if ( mySrsId > 0 )
{
createFromSrsId( mySrsId );
}
}
}
else
{
// Last ditch attempt to piece together what we know of the projection to find a match...
QgsDebugMsg( "globbing search for srsid from this proj string" );
setProj4String( theProj4String );
mySrsId = findMatchingProj();
QgsDebugMsg( "globbing search for srsid returned srsid: " + QString::number( mySrsId ) );
if ( mySrsId > 0 )
{
createFromSrsId( mySrsId );
}
else
{
mIsValidFlag = false;
}
}
}
// if we failed to look up the projection in database, don't worry. we can still use it :)
if ( !mIsValidFlag )
{
QgsDebugMsg( "Projection is not found in databases." );
setProj4String( theProj4String );
// Is the SRS is valid now, we know it's a decent +proj string that can be entered into the srs.db
if ( mIsValidFlag )
{
// Try to save. If not possible, set to invalid. Problems on read only systems?
QgsDebugMsg( "Projection appears to be valid. Save to database!" );
mIsValidFlag = saveAsUserCRS();
// The srsid is not set, we should do that now.
if ( mIsValidFlag )
{
myRecord = getRecord( "select * from tbl_srs where parameters='" + theProj4String.trimmed() + "'" );
if ( !myRecord.empty() )
{
mySrsId = myRecord["srs_id"].toLong();
QgsDebugMsg( "proj4string match search for srsid returned srsid: " + QString::number( mySrsId ) );
if ( mySrsId > 0 )
{
createFromSrsId( mySrsId );
}
else
{
QgsDebugMsg( "Couldn't find newly added proj string?" );
mIsValidFlag = false;
}
}
}
}
}
return mIsValidFlag;
}
//private method meant for internal use by this class only
QgsCoordinateReferenceSystem::RecordMap QgsCoordinateReferenceSystem::getRecord( QString theSql )
{
QString myDatabaseFileName;
QgsCoordinateReferenceSystem::RecordMap myMap;
QString myFieldName;
QString myFieldValue;
sqlite3 *myDatabase;
const char *myTail;
sqlite3_stmt *myPreparedStatement;
int myResult;
QgsDebugMsg( "running query: " + theSql );
// Get the full path name to the sqlite3 spatial reference database.
myDatabaseFileName = QgsApplication::srsDbFilePath();
QFileInfo myInfo( myDatabaseFileName );
if ( !myInfo.exists() )
{
QgsDebugMsg( "failed : " + myDatabaseFileName +
" does not exist!" );
return myMap;
}
//check the db is available
myResult = openDb( myDatabaseFileName, &myDatabase );
if ( myResult )
{
return myMap;
}
myResult = sqlite3_prepare( myDatabase, theSql.toUtf8(), theSql.toUtf8().length(), &myPreparedStatement, &myTail );
// XXX Need to free memory from the error msg if one is set
if ( myResult == SQLITE_OK && sqlite3_step( myPreparedStatement ) == SQLITE_ROW )
{
QgsDebugMsg( "trying system srs.db" );
int myColumnCount = sqlite3_column_count( myPreparedStatement );
//loop through each column in the record adding its expression name and value to the map
for ( int myColNo = 0; myColNo < myColumnCount; myColNo++ )
{
myFieldName = QString::fromUtf8(( char * )sqlite3_column_name( myPreparedStatement, myColNo ) );
myFieldValue = QString::fromUtf8(( char * )sqlite3_column_text( myPreparedStatement, myColNo ) );
myMap[myFieldName] = myFieldValue;
}
}
else
{
QgsDebugMsg( "trying user qgis.db" );
sqlite3_finalize( myPreparedStatement );
sqlite3_close( myDatabase );
myDatabaseFileName = QgsApplication::qgisUserDbFilePath();
QFileInfo myFileInfo;
myFileInfo.setFile( myDatabaseFileName );
if ( !myFileInfo.exists( ) )
{
QgsDebugMsg( "user qgis.db not found" );
return myMap;
}
//check the db is available
myResult = openDb( myDatabaseFileName, &myDatabase );
if ( myResult )
{
return myMap;
}
myResult = sqlite3_prepare( myDatabase, theSql.toUtf8(), theSql.toUtf8().length(), &myPreparedStatement, &myTail );
// XXX Need to free memory from the error msg if one is set
if ( myResult == SQLITE_OK && sqlite3_step( myPreparedStatement ) == SQLITE_ROW )
{
int myColumnCount = sqlite3_column_count( myPreparedStatement );
//loop through each column in the record adding its field name and value to the map
for ( int myColNo = 0; myColNo < myColumnCount; myColNo++ )
{
myFieldName = QString::fromUtf8(( char * )sqlite3_column_name( myPreparedStatement, myColNo ) );
myFieldValue = QString::fromUtf8(( char * )sqlite3_column_text( myPreparedStatement, myColNo ) );
myMap[myFieldName] = myFieldValue;
}
}
else
{
QgsDebugMsg( "failed : " + theSql );
}
}
sqlite3_finalize( myPreparedStatement );
sqlite3_close( myDatabase );
#ifdef QGISDEBUG
QgsDebugMsg( "retrieved: " + theSql );
RecordMap::Iterator it;
for ( it = myMap.begin(); it != myMap.end(); ++it )
{
QgsDebugMsgLevel( it.key() + " => " + it.value(), 2 );
}
#endif
return myMap;
}
// Accessors -----------------------------------
long QgsCoordinateReferenceSystem::srsid() const
{
return mSrsId;
}
long QgsCoordinateReferenceSystem::postgisSrid() const
{
return mSRID;
}
long QgsCoordinateReferenceSystem::epsg() const
{
if ( mAuthId.startsWith( "EPSG:", Qt::CaseInsensitive ) )
return mAuthId.mid( 5 ).toLong();
else
return 0;
}
QString QgsCoordinateReferenceSystem::authid() const
{
return mAuthId;
}
QString QgsCoordinateReferenceSystem::description() const
{
if ( mDescription.isNull() )
{
return "";
}
else
{
return mDescription;
}
}
QString QgsCoordinateReferenceSystem::projectionAcronym() const
{
if ( mProjectionAcronym.isNull() )
{
return "";
}
else
{
return mProjectionAcronym;
}
}
QString QgsCoordinateReferenceSystem::ellipsoidAcronym() const
{
if ( mEllipsoidAcronym.isNull() )
{
return "";
}
else
{
return mEllipsoidAcronym;
}
}
QString QgsCoordinateReferenceSystem::toProj4() const
{
if ( !mIsValidFlag )
return "";
QString toProj4;
char *proj4src = NULL;
OSRExportToProj4( mCRS, &proj4src );
toProj4 = proj4src;
CPLFree( proj4src );
// Stray spaces at the end?
return toProj4.trimmed();
}
bool QgsCoordinateReferenceSystem::geographicFlag() const
{
return mGeoFlag;
}
QGis::UnitType QgsCoordinateReferenceSystem::mapUnits() const
{
return mMapUnits;
}
// Mutators -----------------------------------
void QgsCoordinateReferenceSystem::setInternalId( long theSrsId )
{
mSrsId = theSrsId;
}
void QgsCoordinateReferenceSystem::setAuthId( QString authId )
{
mAuthId = authId;
}
void QgsCoordinateReferenceSystem::setSrid( long theSrid )
{
mSRID = theSrid;
}
void QgsCoordinateReferenceSystem::setDescription( QString theDescription )
{
mDescription = theDescription;
}
void QgsCoordinateReferenceSystem::setProj4String( QString theProj4String )
{
const char *oldlocale = setlocale( LC_NUMERIC, NULL );
setlocale( LC_NUMERIC, "C" );
OSRDestroySpatialReference( mCRS );
mCRS = OSRNewSpatialReference( NULL );
mIsValidFlag = OSRImportFromProj4( mCRS, theProj4String.toLatin1().constData() ) == OGRERR_NONE;
setMapUnits();
#if defined(QGISDEBUG) && QGISDEBUG>=3
debugPrint();
#endif
setlocale( LC_NUMERIC, oldlocale );
}
void QgsCoordinateReferenceSystem::setGeographicFlag( bool theGeoFlag )
{
mGeoFlag = theGeoFlag;
}
void QgsCoordinateReferenceSystem::setEpsg( long theEpsg )
{
mAuthId = QString( "EPSG:%1" ).arg( theEpsg );
}
void QgsCoordinateReferenceSystem::setProjectionAcronym( QString theProjectionAcronym )
{
mProjectionAcronym = theProjectionAcronym;
}
void QgsCoordinateReferenceSystem::setEllipsoidAcronym( QString theEllipsoidAcronym )
{
mEllipsoidAcronym = theEllipsoidAcronym;
}
void QgsCoordinateReferenceSystem::setMapUnits()
{
if ( !mIsValidFlag )
{
mMapUnits = QGis::UnknownUnit;
return;
}
char *unitName;
// Of interest to us is that this call adds in a unit parameter if
// one doesn't already exist.
OSRFixup( mCRS );
if ( OSRIsProjected( mCRS ) )
{
double toMeter = OSRGetLinearUnits( mCRS, &unitName );
QString unit( unitName );
// If the units parameter was created during the Fixup() call
// above, the name of the units is likely to be 'unknown'. Try to
// do better than that ... (but perhaps ogr should be enhanced to
// do this instead?).
static const double feetToMeter = 0.3048;
static const double smallNum = 1e-3;
if ( std::abs( toMeter - feetToMeter ) < smallNum )
unit = "Foot";
QgsDebugMsg( "Projection has linear units of " + unit );
if ( unit == "Meter" )
mMapUnits = QGis::Meters;
else if ( unit == "Foot" )
mMapUnits = QGis::Feet;
else
{
QgsDebugMsg( "Unsupported map units of " + unit );
mMapUnits = QGis::UnknownUnit;
}
}
else
{
OSRGetAngularUnits( mCRS, &unitName );
QString unit( unitName );
if ( unit == "degree" )
mMapUnits = QGis::Degrees;
else
{
QgsDebugMsg( "Unsupported map units of " + unit );
mMapUnits = QGis::UnknownUnit;
}
QgsDebugMsgLevel( "Projection has angular units of " + unit, 3 );
}
}
/*
* check if srs is a geocs or a proj cs (using ogr isGeographic)
* then sequentially walk through the database (first users qgis.db srs tbl then
* system srs.db tbl), converting each entry into an ogr srs and using isSame
* or isSameGeocs (essentially calling the == overloaded operator). We'll try to
* be smart about this and first parse out the proj and ellpse strings and only
* check for a match in entities that have the same ellps and proj entries so
* that it doesnt munch yer cpu so much.
*/
long QgsCoordinateReferenceSystem::findMatchingProj()
{
QgsDebugMsg( "entered." );
if ( mEllipsoidAcronym.isNull() || mProjectionAcronym.isNull() || !mIsValidFlag )
{
QgsDebugMsg( "QgsCoordinateReferenceSystem::findMatchingProj will only work if prj acr ellipsoid acr and proj4string are set"
" and the current projection is valid!" );
return 0;
}
sqlite3 *myDatabase;
const char *myTail;
sqlite3_stmt *myPreparedStatement;
int myResult;
// Set up the query to retrieve the projection information needed to populate the list
QString mySql = QString( "select srs_id,parameters from tbl_srs where projection_acronym='" +
mProjectionAcronym + "' and ellipsoid_acronym='" + mEllipsoidAcronym + "'" );
// Get the full path name to the sqlite3 spatial reference database.
QString myDatabaseFileName = QgsApplication::srsDbFilePath();
//check the db is available
myResult = openDb( myDatabaseFileName, &myDatabase );
if ( myResult )
{
return 0;
}
myResult = sqlite3_prepare( myDatabase, mySql.toUtf8(), mySql.toUtf8().length(), &myPreparedStatement, &myTail );
// XXX Need to free memory from the error msg if one is set
if ( myResult == SQLITE_OK )
{
while ( sqlite3_step( myPreparedStatement ) == SQLITE_ROW )
{
QString mySrsId = QString::fromUtf8(( char * )sqlite3_column_text( myPreparedStatement, 0 ) );
QString myProj4String = QString::fromUtf8(( char * )sqlite3_column_text( myPreparedStatement, 1 ) );
if ( equals( myProj4String ) )
{
QgsDebugMsg( "-------> MATCH FOUND in srs.db srsid: " + mySrsId );
// close the sqlite3 statement
sqlite3_finalize( myPreparedStatement );
sqlite3_close( myDatabase );
return mySrsId.toLong();
}
else
{
// QgsDebugMsg(QString(" Not matched : %1").arg(myProj4String));
}
}
}
QgsDebugMsg( "no match found in srs.db, trying user db now!" );
// close the sqlite3 statement
sqlite3_finalize( myPreparedStatement );
sqlite3_close( myDatabase );
//
// Try the users db now
//
myDatabaseFileName = QgsApplication::qgisUserDbFilePath();
//check the db is available
myResult = openDb( myDatabaseFileName, &myDatabase );
if ( myResult )
{
return 0;
}
myResult = sqlite3_prepare( myDatabase, mySql.toUtf8(), mySql.toUtf8().length(), &myPreparedStatement, &myTail );
// XXX Need to free memory from the error msg if one is set
if ( myResult == SQLITE_OK )
{
while ( sqlite3_step( myPreparedStatement ) == SQLITE_ROW )
{
QString mySrsId = QString::fromUtf8(( char * )sqlite3_column_text( myPreparedStatement, 0 ) );
QString myProj4String = QString::fromUtf8(( char * )sqlite3_column_text( myPreparedStatement, 1 ) );
if ( equals( myProj4String ) )
{
QgsDebugMsg( "-------> MATCH FOUND in user qgis.db srsid: " + mySrsId );
// close the sqlite3 statement
sqlite3_finalize( myPreparedStatement );
sqlite3_close( myDatabase );
return mySrsId.toLong();
}
else
{
// QgsDebugMsg(QString(" Not matched : %1").arg(myProj4String));
}
}
}
QgsDebugMsg( "no match found in user db" );
// close the sqlite3 statement
sqlite3_finalize( myPreparedStatement );
sqlite3_close( myDatabase );
return 0;
}
bool QgsCoordinateReferenceSystem::operator==( const QgsCoordinateReferenceSystem &theSrs )
{
if ( !mIsValidFlag || !theSrs.mIsValidFlag )
{
return false;
}
char *thisStr;
char *otherStr;
// OSRIsSame is not relaibel when it comes to comparing +towgs84 parameters
// Use string compare on WKT instead.
if (( OSRExportToWkt( mCRS, &thisStr ) == OGRERR_NONE ) )
{
if ( OSRExportToWkt( theSrs.mCRS, &otherStr ) == OGRERR_NONE )
{
QgsDebugMsgLevel( QString( "Comparing " ) + thisStr, 3 );
QgsDebugMsgLevel( QString( " with " ) + otherStr, 3 );
if ( !strcmp( thisStr, otherStr ) )
{
QgsDebugMsgLevel( QString( "MATCHED!" ) + otherStr, 3 );
CPLFree( thisStr );
CPLFree( otherStr );
return true;
}
CPLFree( otherStr );
}
CPLFree( thisStr );
}
return false;
}
bool QgsCoordinateReferenceSystem::operator!=( const QgsCoordinateReferenceSystem &theSrs )
{
return !( *this == theSrs );
}
bool QgsCoordinateReferenceSystem::equals( QString theProj4String )
{
QgsCoordinateReferenceSystem r;
r.setProj4String( theProj4String );
return *this == r;
}
QString QgsCoordinateReferenceSystem::toWkt() const
{
QString myWkt;
char* Wkt;
if ( OSRExportToWkt( mCRS, &Wkt ) == OGRERR_NONE )
{
myWkt = Wkt;
OGRFree( Wkt );
}
return myWkt;
}
bool QgsCoordinateReferenceSystem::readXML( QDomNode & theNode )
{
QgsDebugMsg( "Reading Spatial Ref Sys from xml ------------------------!" );
QDomNode srsNode = theNode.namedItem( "spatialrefsys" );
if ( ! srsNode.isNull() )
{
bool initialized = false;
QDomNode myNode = srsNode.namedItem( "authid" );
if ( !myNode.isNull() )
{
initialized = createFromOgcWmsCrs( myNode.toElement().text() );
}
if ( !initialized )
{
myNode = srsNode.namedItem( "epsg" );
if ( !myNode.isNull() )
initialized = createFromEpsg( myNode.toElement().text().toLong() );
}
if ( initialized )
{
QgsDebugMsg( "Set from auth id" );
}
else
{
myNode = srsNode.namedItem( "proj4" );
if ( createFromProj4( myNode.toElement().text() ) )
{
// createFromProj4() sets everything, including map units
QgsDebugMsg( "Setting from proj4 string" );
}
else
{
QgsDebugMsg( "Setting from elements one by one" );
myNode = srsNode.namedItem( "proj4" );
setProj4String( myNode.toElement().text() );
myNode = srsNode.namedItem( "srsid" );
setInternalId( myNode.toElement().text().toLong() );
myNode = srsNode.namedItem( "srid" );
setSrid( myNode.toElement().text().toLong() );
myNode = srsNode.namedItem( "authid" );
setAuthId( myNode.toElement().text() );
myNode = srsNode.namedItem( "description" );
setDescription( myNode.toElement().text() );
myNode = srsNode.namedItem( "projectionacronym" );
setProjectionAcronym( myNode.toElement().text() );
myNode = srsNode.namedItem( "ellipsoidacronym" );
setEllipsoidAcronym( myNode.toElement().text() );
myNode = srsNode.namedItem( "geographicflag" );
if ( myNode.toElement().text().compare( "true" ) )
{
setGeographicFlag( true );
}
else
{
setGeographicFlag( false );
}
//make sure the map units have been set
setMapUnits();