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qgscoordinatereferencesystem.cpp
2153 lines (1863 loc) · 64.9 KB
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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 <QTemporaryFile>
#include <QDomNode>
#include <QDomElement>
#include <QFileInfo>
#include <QRegExp>
#include <QTextStream>
#include <QFile>
#include <QSettings>
#include "qgsapplication.h"
#include "qgscrscache.h"
#include "qgslogger.h"
#include "qgsmessagelog.h"
#include "qgis.h" //const vals declared here
#include <sqlite3.h>
#include <proj_api.h>
//gdal and ogr includes (needed for == operator)
#include <ogr_srs_api.h>
#include <cpl_error.h>
#include <cpl_conv.h>
#include <cpl_csv.h>
CUSTOM_CRS_VALIDATION QgsCoordinateReferenceSystem::mCustomSrsValidation = NULL;
//--------------------------
QgsCoordinateReferenceSystem::QgsCoordinateReferenceSystem()
: mSrsId( 0 )
, mGeoFlag( false )
, mMapUnits( QGis::UnknownUnit )
, mSRID( 0 )
, mIsValidFlag( 0 )
, mValidationHint( "" )
, mAxisInverted( false )
{
mCRS = OSRNewSpatialReference( NULL );
}
QgsCoordinateReferenceSystem::QgsCoordinateReferenceSystem( QString theDefinition )
: mSrsId( 0 )
, mGeoFlag( false )
, mMapUnits( QGis::UnknownUnit )
, mSRID( 0 )
, mIsValidFlag( 0 )
, mValidationHint( "" )
, mAxisInverted( false )
{
mCRS = OSRNewSpatialReference( NULL );
createFromString( theDefinition );
}
QgsCoordinateReferenceSystem::QgsCoordinateReferenceSystem( const long theId, CrsType theType )
: mSrsId( 0 )
, mGeoFlag( false )
, mMapUnits( QGis::UnknownUnit )
, mSRID( 0 )
, mIsValidFlag( 0 )
, mValidationHint( "" )
, mAxisInverted( false )
{
mCRS = OSRNewSpatialReference( NULL );
createFromId( theId, theType );
}
QgsCoordinateReferenceSystem::~QgsCoordinateReferenceSystem()
{
OSRDestroySpatialReference( mCRS );
}
bool QgsCoordinateReferenceSystem::createFromId( const long theId, CrsType theType )
{
bool result = false;
switch ( theType )
{
case InternalCrsId:
result = createFromSrsId( theId );
break;
case PostgisCrsId:
result = createFromSrid( theId );
break;
case EpsgCrsId:
result = createFromOgcWmsCrs( QString( "EPSG:%1" ).arg( theId ) );
break;
default:
//THIS IS BAD...THIS PART OF CODE SHOULD NEVER BE REACHED...
QgsDebugMsg( "Unexpected case reached!" );
};
return result;
}
bool QgsCoordinateReferenceSystem::createFromString( const QString theDefinition )
{
bool result = false;
QRegExp reCrsId( "^(epsg|postgis|internal)\\:(\\d+)$", Qt::CaseInsensitive );
if ( reCrsId.indexIn( theDefinition ) == 0 )
{
QString authName = reCrsId.cap( 1 ).toLower();
CrsType type = InternalCrsId;
if ( authName == "epsg" )
type = EpsgCrsId;
if ( authName == "postgis" )
type = PostgisCrsId;
long id = reCrsId.cap( 2 ).toLong();
result = createFromId( id, type );
}
else
{
QRegExp reCrsStr( "^(?:(wkt|proj4)\\:)?(.+)$", Qt::CaseInsensitive );
if ( reCrsStr.indexIn( theDefinition ) == 0 )
{
if ( reCrsStr.cap( 1 ).toLower() == "proj4" )
{
result = createFromProj4( reCrsStr.cap( 2 ) );
//TODO: createFromProj4 used to save to the user database any new CRS
// this behavior was changed in order to separate creation and saving.
// Not sure if it necessary to save it here, should be checked by someone
// familiar with the code (should also give a more descriptive name to the generated CRS)
if ( srsid() == 0 )
{
QString myName = QString( " * %1 (%2)" )
.arg( QObject::tr( "Generated CRS", "A CRS automatically generated from layer info get this prefix for description" ) )
.arg( toProj4() );
saveAsUserCRS( myName );
}
}
else
{
result = createFromWkt( reCrsStr.cap( 2 ) );
}
}
}
return result;
}
bool QgsCoordinateReferenceSystem::createFromUserInput( const QString theDefinition )
{
QString theWkt;
char *wkt = NULL;
OGRSpatialReferenceH crs = OSRNewSpatialReference( NULL );
// make sure towgs84 parameter is loaded if using an ESRI definition and gdal >= 1.9
#if GDAL_VERSION_NUM >= 1900
if ( theDefinition.startsWith( "ESRI::" ) )
{
setupESRIWktFix();
}
#endif
if ( OSRSetFromUserInput( crs, theDefinition.toLocal8Bit().constData() ) == OGRERR_NONE )
{
if ( OSRExportToWkt( crs, &wkt ) == OGRERR_NONE )
{
theWkt = wkt;
OGRFree( wkt );
}
OSRDestroySpatialReference( crs );
}
//QgsDebugMsg( "theDefinition: " + theDefinition + " theWkt = " + theWkt );
return createFromWkt( theWkt );
}
void QgsCoordinateReferenceSystem::setupESRIWktFix( )
{
// make sure towgs84 parameter is loaded if gdal >= 1.9
// this requires setting GDAL_FIX_ESRI_WKT=GEOGCS (see qgis bug #5598 and gdal bug #4673)
#if GDAL_VERSION_NUM >= 1900
const char* configOld = CPLGetConfigOption( "GDAL_FIX_ESRI_WKT", "" );
const char* configNew = "GEOGCS";
// only set if it was not set, to let user change the value if needed
if ( strcmp( configOld, "" ) == 0 )
{
CPLSetConfigOption( "GDAL_FIX_ESRI_WKT", configNew );
if ( strcmp( configNew, CPLGetConfigOption( "GDAL_FIX_ESRI_WKT", "" ) ) != 0 )
QgsLogger::warning( QString( "GDAL_FIX_ESRI_WKT could not be set to %1 : %2" )
.arg( configNew ).arg( CPLGetConfigOption( "GDAL_FIX_ESRI_WKT", "" ) ) ) ;
QgsDebugMsg( QString( "set GDAL_FIX_ESRI_WKT : %1" ).arg( configNew ) );
}
else
{
QgsDebugMsg( QString( "GDAL_FIX_ESRI_WKT was already set : %1" ).arg( configNew ) );
}
#endif
}
bool QgsCoordinateReferenceSystem::createFromOgcWmsCrs( QString theCrs )
{
QRegExp re( "urn:ogc:def:crs:([^:]+).+([^:]+)", Qt::CaseInsensitive );
if ( re.exactMatch( theCrs ) )
{
theCrs = re.cap( 1 ) + ":" + re.cap( 2 );
}
else
{
re.setPattern( "(user|custom|qgis):(\\d+)" );
if ( re.exactMatch( theCrs ) && createFromSrsId( re.cap( 2 ).toInt() ) )
{
return true;
}
}
if ( loadFromDb( QgsApplication::srsDbFilePath(), "lower(auth_name||':'||auth_id)", theCrs.toLower() ) )
return true;
// NAD27
if ( theCrs.compare( "CRS:27", Qt::CaseInsensitive ) == 0 ||
theCrs.compare( "OGC:CRS27", Qt::CaseInsensitive ) == 0 )
{
// TODO: verify same axis orientation
return createFromOgcWmsCrs( "EPSG:4267" );
}
// NAD83
if ( theCrs.compare( "CRS:83", Qt::CaseInsensitive ) == 0 ||
theCrs.compare( "OGC:CRS83", Qt::CaseInsensitive ) == 0 )
{
// TODO: verify same axis orientation
return createFromOgcWmsCrs( "EPSG:4269" );
}
// WGS84
if ( theCrs.compare( "CRS:84", Qt::CaseInsensitive ) == 0 ||
theCrs.compare( "OGC:CRS84", Qt::CaseInsensitive ) == 0 )
{
createFromOgcWmsCrs( "EPSG:4326" );
mAxisInverted = 0;
return mIsValidFlag;
}
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;
mAxisInverted = srs.mAxisInverted;
mMapUnits = srs.mMapUnits;
mSRID = srs.mSRID;
mAuthId = srs.mAuthId;
mIsValidFlag = srs.mIsValidFlag;
mValidationHint = srs.mValidationHint;
mWkt = srs.mWkt;
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 )
{
*this = QgsCRSCache::instance()->crsByAuthId( GEO_EPSG_CRS_AUTHID );
}
}
bool QgsCoordinateReferenceSystem::createFromSrid( long id )
{
return loadFromDb( QgsApplication::srsDbFilePath(), "srid", QString::number( id ) );
}
bool QgsCoordinateReferenceSystem::createFromSrsId( long id )
{
return loadFromDb( id < USER_CRS_START_ID ? 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;
mWkt.clear();
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 != SQLITE_OK )
{
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 + "=" + quotedValue( value ) + " order by deprecated";
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 ) );
mGeoFlag = QString::fromUtf8(( char * )sqlite3_column_text( myPreparedStatement, 7 ) ).toInt() != 0;
mAxisInverted = -1;
if ( mSrsId >= USER_CRS_START_ID && mAuthId.isEmpty() )
{
mAuthId = QString( "USER:%1" ).arg( mSrsId );
}
else if ( mAuthId.startsWith( "EPSG:", Qt::CaseInsensitive ) )
{
OSRDestroySpatialReference( mCRS );
mCRS = OSRNewSpatialReference( NULL );
mIsValidFlag = OSRSetFromUserInput( mCRS, mAuthId.toLower().toAscii() ) == OGRERR_NONE;
setMapUnits();
}
if ( !mIsValidFlag )
{
setProj4String( toProj4 );
}
}
else
{
QgsDebugMsg( "failed : " + mySql );
}
sqlite3_finalize( myPreparedStatement );
sqlite3_close( myDatabase );
return mIsValidFlag;
}
bool QgsCoordinateReferenceSystem::axisInverted() const
{
if ( mAxisInverted == -1 )
{
OGRAxisOrientation orientation;
const char *axis0 = OSRGetAxis( mCRS, mGeoFlag ? "GEOGCS" : "PROJCS", 0, &orientation );
mAxisInverted = mGeoFlag
? ( orientation == OAO_East || orientation == OAO_West || orientation == OAO_Other )
: ( orientation == OAO_North || orientation == OAO_South );
QgsDebugMsg( QString( "srid:%1 axis0:%2 orientation:%3 inverted:%4" ).arg( mSRID ).arg( axis0 ).arg( OSRAxisEnumToName( orientation ) ).arg( mAxisInverted ) );
Q_UNUSED( axis0 );
}
return mAxisInverted != 0;
}
bool QgsCoordinateReferenceSystem::createFromWkt( QString theWkt )
{
mIsValidFlag = false;
mWkt.clear();
if ( theWkt.isEmpty() )
{
QgsDebugMsg( "theWkt is uninitialised, operation failed" );
return mIsValidFlag;
}
QgsDebugMsg( "wkt: " + theWkt );
QByteArray ba = theWkt.toLatin1();
const char *pWkt = ba.data();
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( QString( "UNUSED WKT: %1" ).arg( pWkt ) );
QgsDebugMsg( "---------------------------------------------------------------\n" );
return mIsValidFlag;
}
if ( OSRAutoIdentifyEPSG( mCRS ) == OGRERR_NONE )
{
QString authid = QString( "%1:%2" )
.arg( OSRGetAuthorityName( mCRS, NULL ) )
.arg( OSRGetAuthorityCode( mCRS, NULL ) );
QgsDebugMsg( "authid recognized as " + authid );
return createFromOgcWmsCrs( authid );
}
// 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 createFromProj4 so
// that we can try to fill in the remaining class members...
//create from Proj will set the isValidFlag
if ( !createFromProj4( proj4src ) )
{
CPLFree( proj4src );
// try fixed up version
OSRFixup( mCRS );
OSRExportToProj4( mCRS, &proj4src );
createFromProj4( proj4src );
}
//TODO: createFromProj4 used to save to the user database any new CRS
// this behavior was changed in order to separate creation and saving.
// Not sure if it necessary to save it here, should be checked by someone
// familiar with the code (should also give a more descriptive name to the generated CRS)
if ( mSrsId == 0 )
{
QString myName = QString( " * %1 (%2)" )
.arg( QObject::tr( "Generated CRS", "A CRS automatically generated from layer info get this prefix for description" ) )
.arg( toProj4() );
saveAsUserCRS( myName );
}
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
//
QString myProj4String = theProj4String.trimmed();
QgsDebugMsg( "proj4: " + myProj4String );
mIsValidFlag = false;
mWkt.clear();
QRegExp myProjRegExp( "\\+proj=(\\S+)" );
int myStart = myProjRegExp.indexIn( myProj4String );
if ( myStart == -1 )
{
QgsDebugMsg( "proj string supplied has no +proj argument" );
return mIsValidFlag;
}
mProjectionAcronym = myProjRegExp.cap( 1 );
QRegExp myEllipseRegExp( "\\+ellps=(\\S+)" );
myStart = myEllipseRegExp.indexIn( myProj4String );
if ( myStart == -1 )
{
QgsDebugMsg( "proj string supplied has no +ellps argument" );
mEllipsoidAcronym = "";
}
else
{
mEllipsoidAcronym = myEllipseRegExp.cap( 1 );
}
QRegExp myAxisRegExp( "\\+a=(\\S+)" );
myStart = myAxisRegExp.indexIn( myProj4String );
if ( myStart == -1 )
{
QgsDebugMsg( "proj string supplied has no +a argument" );
}
/*
* 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;
/*
* - 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=" + quotedValue( myProj4String ) + " order by deprecated" );
if ( myRecord.empty() )
{
// 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( myProj4String, myStart1 );
myStart2 = myLat2RegExp.indexIn( myProj4String, myStart2 );
if ( myStart1 != -1 && myStart2 != -1 )
{
myLength1 = myLat1RegExp.matchedLength();
myLength2 = myLat2RegExp.matchedLength();
lat1Str = myProj4String.mid( myStart1 + LAT_PREFIX_LEN, myLength1 - LAT_PREFIX_LEN );
lat2Str = myProj4String.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 = myProj4String;
// 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=" + quotedValue( theProj4StringModified.trimmed() ) + " order by deprecated" );
}
}
if ( myRecord.empty() )
{
// match all parameters individually:
// - order of parameters doesn't matter
// - found definition may have more parameters (like +towgs84 in GDAL)
// - retry without datum, if no match is found (looks like +datum<>WGS84 was dropped in GDAL)
QString sql = "SELECT * FROM tbl_srs WHERE ";
QString delim = "";
QString datum;
// split on spaces followed by a plus sign (+) to deal
// also with parameters containing spaces (e.g. +nadgrids)
// make sure result is trimmed (#5598)
QStringList myParams;
foreach ( QString param, myProj4String.split( QRegExp( "\\s+(?=\\+)" ), QString::SkipEmptyParts ) )
{
QString arg = QString( "' '||parameters||' ' LIKE %1" ).arg( quotedValue( QString( "% %1 %" ).arg( param.trimmed() ) ) );
if ( param.startsWith( "+datum=" ) )
{
datum = arg;
}
else
{
sql += delim + arg;
delim = " AND ";
myParams << param.trimmed();
}
}
if ( !datum.isEmpty() )
{
myRecord = getRecord( sql + delim + datum + " order by deprecated" );
}
if ( myRecord.empty() )
{
// datum might have disappeared in definition - retry without it
myRecord = getRecord( sql + " order by deprecated" );
}
if ( !myRecord.empty() )
{
// Bugfix 8487 : test param lists are equal, except for +datum
QStringList foundParams;
foreach ( QString param, myRecord["parameters"].split( QRegExp( "\\s+(?=\\+)" ), QString::SkipEmptyParts ) )
{
if ( !param.startsWith( "+datum=" ) )
foundParams << param.trimmed();
}
myParams.sort();
foundParams.sort();
if ( myParams != foundParams )
{
myRecord.clear();
}
}
}
if ( !myRecord.empty() )
{
mySrsId = myRecord["srs_id"].toLong();
QgsDebugMsg( "proj4string param 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( myProj4String );
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 will set mIsValidFlag to true if there is no issue
setProj4String( myProj4String );
}
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 != SQLITE_OK )
{
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;
}
if ( sqlite3_step( myPreparedStatement ) != SQLITE_DONE )
{
QgsDebugMsg( "Multiple records found in srs.db" );
myMap.clear();
}
}
else
{
QgsDebugMsg( "failed : " + theSql );
}
if ( myMap.empty() )
{
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 != SQLITE_OK )
{
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;
}
if ( sqlite3_step( myPreparedStatement ) != SQLITE_DONE )
{
QgsDebugMsg( "Multiple records found in srs.db" );
myMap.clear();
}
}
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;
}
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 )
{
char *oldlocale = setlocale( LC_NUMERIC, NULL );
/* the next setlocale() invalides the return of previous setlocale() */
if ( oldlocale )
oldlocale = strdup( oldlocale );
setlocale( LC_NUMERIC, "C" );
OSRDestroySpatialReference( mCRS );
mCRS = OSRNewSpatialReference( NULL );
mIsValidFlag =
OSRImportFromProj4( mCRS, theProj4String.trimmed().toLatin1().constData() )
== OGRERR_NONE;
mWkt.clear();
setMapUnits();
#if defined(QGISDEBUG) && QGISDEBUG>=3
debugPrint();
#endif
setlocale( LC_NUMERIC, oldlocale );
free( 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 ( qAbs( toMeter - feetToMeter ) < smallNum )
unit = "Foot";
QgsDebugMsg( "Projection has linear units of " + unit );
if ( qgsDoubleNear( toMeter, 1.0 ) ) //Unit name for meters would be "metre"
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;