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qgsspatialrefsys.cpp
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qgsspatialrefsys.cpp
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/***************************************************************************
qgsspatialrefsys.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 "qgsspatialrefsys.h"
#include <cmath>
#include <QDir>
#include <QDomNode>
#include <QDomElement>
#include <QFileInfo>
#include <QRegExp>
#include "qgsapplication.h"
#include "qgslogger.h"
#include "qgsmessageoutput.h"
#include "qgis.h" //const vals declared here
#include <sqlite3.h>
//gdal and ogr includes (needed for == operator)
#include <ogr_srs_api.h>
#include <cpl_error.h>
#include <cpl_conv.h>
CUSTOM_SRS_VALIDATION QgsSpatialRefSys::mCustomSrsValidation = NULL;
//--------------------------
QgsSpatialRefSys::QgsSpatialRefSys()
: mMapUnits(QGis::UNKNOWN),
mIsValidFlag(0)
{
mSRS = OSRNewSpatialReference(NULL);
}
QgsSpatialRefSys::QgsSpatialRefSys(QString theWkt)
: mMapUnits(QGis::UNKNOWN),
mIsValidFlag(0)
{
mSRS = OSRNewSpatialReference(NULL);
createFromWkt(theWkt);
}
QgsSpatialRefSys::QgsSpatialRefSys(const long theId, SRS_TYPE theType)
: mMapUnits(QGis::UNKNOWN),
mIsValidFlag(0)
{
mSRS = OSRNewSpatialReference(NULL);
createFromId(theId, theType);
}
QgsSpatialRefSys::~QgsSpatialRefSys()
{
OSRDestroySpatialReference( mSRS );
}
void QgsSpatialRefSys::createFromId(const long theId, SRS_TYPE theType)
{
switch (theType)
{
case QGIS_SRSID:
createFromSrsId(theId);
break;
case POSTGIS_SRID:
createFromSrid(theId);
break;
case EPSG:
createFromEpsg(theId);
break;
default:
//THIS IS BAD...THIS PART OF CODE SHOULD NEVER BE REACHED...
QgsLogger::critical("Unexpected case reached in " + QString(__FILE__) + " : " + QString(__LINE__));
};
}
bool QgsSpatialRefSys::createFromOgcWmsCrs(QString theCrs)
{
QStringList parts = theCrs.split(":");
if (parts.at(0) == "EPSG")
{
createFromEpsg( parts.at(1).toLong() );
}
else if (parts.at(0) == "CRS")
{
if (parts.at(1) == "84")
{
//! \todo - CRS:84 is hardcoded to EPSG:4326 - see if this is appropriate
/**
* See WMS 1.3 standard appendix B3 for details
*/
createFromEpsg( 4326 );
}
}
else
{
return FALSE;
}
return TRUE;
}
QgsSpatialRefSys::QgsSpatialRefSys(const QgsSpatialRefSys &srs)
{
mSRS = OSRNewSpatialReference(NULL);
*this = srs;
}
// Assignment operator
QgsSpatialRefSys& QgsSpatialRefSys::operator=(const QgsSpatialRefSys& 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;
mEpsg = srs.mEpsg;
mIsValidFlag = srs.mIsValidFlag;
if(mIsValidFlag)
{
OSRDestroySpatialReference(mSRS);
mSRS = OSRClone(srs.mSRS);
}
}
return *this;
}
// Misc helper functions -----------------------
void QgsSpatialRefSys::validate()
{
if(mIsValidFlag)
return;
// try to validate using custom validation routines
if (mCustomSrsValidation)
mCustomSrsValidation(this);
if(!mIsValidFlag)
// set the default
createFromProj4(GEOPROJ4);
}
bool QgsSpatialRefSys::createFromSrid(long id)
{
return loadFromDb( QgsApplication::srsDbFilePath(), "srid", id);
}
bool QgsSpatialRefSys::createFromEpsg(long id)
{
return loadFromDb( QgsApplication::srsDbFilePath(), "epsg", id);
}
bool QgsSpatialRefSys::createFromSrsId(long id)
{
return loadFromDb( id<100000 ? QgsApplication::srsDbFilePath() : QgsApplication::qgisUserDbFilePath(), "srs_id", id);
}
bool QgsSpatialRefSys::loadFromDb(QString db, QString field, long id)
{
QgsDebugMsg("load SRS from " + db + " where " + field + " is " + QString::number(id));
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,
epsg integer NOT NULL,
is_geo integer NOT NULL);
*/
QString mySql = "select srs_id,description,projection_acronym,ellipsoid_acronym,parameters,srid,epsg,is_geo from tbl_srs where " + field + "='" + QString::number(id) + "'";
myResult = sqlite3_prepare(myDatabase, mySql.utf8(), mySql.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 proj4String = QString::fromUtf8((char *)sqlite3_column_text(myPreparedStatement,4));
mSRID = QString::fromUtf8((char *)sqlite3_column_text(myPreparedStatement,5)).toLong();
mEpsg = QString::fromUtf8((char *)sqlite3_column_text(myPreparedStatement,6)).toLong();
int geo = QString::fromUtf8((char *)sqlite3_column_text(myPreparedStatement,7)).toInt();
mGeoFlag = (geo == 0 ? false : true);
setMapUnits();
mIsValidFlag = true;
OSRImportFromProj4( mSRS, (const char *)proj4String.latin1() );
}
else
{
QgsDebugMsg("failed : " + mySql);
}
sqlite3_finalize(myPreparedStatement);
sqlite3_close(myDatabase);
return mIsValidFlag;
}
bool QgsSpatialRefSys::createFromWkt(QString theWkt)
{
mIsValidFlag = false;
if (theWkt.isEmpty())
{
QgsDebugMsg("QgsSpatialRefSys::createFromWkt -- theWkt is uninitialised, operation failed")
QgsLogger::critical("QgsSpatialRefSys::createFromWkt -- theWkt is uninitialised, operation failed");
return mIsValidFlag;
}
QgsDebugMsg("QgsSpatialRefSys::createFromWkt(QString theWkt) using: " + theWkt);
//this is really ugly but we need to get a QString to a char**
char *pWkt = (char *)theWkt.latin1();
OGRErr myInputResult = OSRImportFromWkt( mSRS, &pWkt );
if (myInputResult != OGRERR_NONE)
{
QgsDebugMsg("vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv");
QgsDebugMsg("QgsSpatialRefSys::createFromWkt(QString theWkt) ");
QgsDebugMsg("This SRS could *** NOT *** be set from the supplied WKT ");
QgsDebugMsg("INPUT: " + theWkt);
QgsDebugMsg("^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^");
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(mSRS, &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 wil set the isValidFalg
createFromProj4(QString(proj4src));
CPLFree(proj4src);
return mIsValidFlag;
//setMapunits will be called by createfromproj above
}
bool QgsSpatialRefSys::isValid() const
{
if (mIsValidFlag)
return true;
QgsDebugMsg("It's an invalid SRS without valid proj4 string");
return false;
}
bool QgsSpatialRefSys::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.search(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.search(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.search(theProj4String, myStart);
if (myStart==-1 && mEllipsoidAcronym.isNull())
{
QgsLogger::warning("QgsSpatialRefSys::createFromProj4 error 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;
QgsSpatialRefSys::RecordMap myRecord;
if (!mDescription.stripWhiteSpace ().isEmpty())
{
myRecord = getRecord("select * from tbl_srs where description='" + mDescription.stripWhiteSpace () + "'");
}
/*
* - if the above does not match perform a whole text search on proj4 string (if not null)
*/
QgsDebugMsg("QgsSpatialRefSys::createFromProj4 wholetext match on name failed, trying proj4string match");
myRecord = getRecord("select * from tbl_srs where parameters='" + theProj4String.stripWhiteSpace () + "'");
if (!myRecord.empty())
{
mySrsId=myRecord["srs_id"].toLong();
QgsDebugMsg("QgsSpatialRefSys::createFromProj4 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.search(theProj4String, myStart1);
myStart2 = myLat2RegExp.search(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.search(theProj4String, myStart2);
theProj4StringModified.replace(myStart2+LAT_PREFIX_LEN,myLength2-LAT_PREFIX_LEN,lat1Str);
QgsDebugMsg("QgsSpatialRefSys::createFromProj4 - trying proj4string match with swapped lat_1,lat_2");
myRecord = getRecord("select * from tbl_srs where parameters='" + theProj4StringModified.stripWhiteSpace () + "'");
if (!myRecord.empty())
{
// Success! We have found the proj string by swapping the lat_1 and lat_2
OSRImportFromProj4(mSRS, (const char *)theProj4StringModified.latin1() );
mySrsId=myRecord["srs_id"].toLong();
QgsDebugMsg("QgsSpatialRefSys::createFromProj4 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("QgsSpatialRefSys::createFromProj4 globbing search for srsid from this proj string");
mySrsId = findMatchingProj();
QgsDebugMsg("QgsSpatialRefSys::createFromProj4 globbing search for srsid returned srsid: " + QString::number(mySrsId));
if (mySrsId > 0)
{
createFromSrsId(mySrsId);
}
}
}
// NOTE: if its still empty after all the above steps then, the projection string is lost. Is that bad?
return mIsValidFlag;
}
QgsSpatialRefSys::RecordMap QgsSpatialRefSys::getRecord(QString theSql)
{
QString myDatabaseFileName;
QgsSpatialRefSys::RecordMap myMap;
QString myFieldName;
QString myFieldValue;
sqlite3 *myDatabase;
const char *myTail;
sqlite3_stmt *myPreparedStatement;
int myResult;
QgsDebugMsg("QgsSpatialRefSys::getRecord...running query: " + theSql);
// Get the full path name to the sqlite3 spatial reference database.
myDatabaseFileName = QgsApplication::srsDbFilePath();
QFileInfo myInfo (myDatabaseFileName);
if (!myInfo.exists())
{
QgsDebugMsg("QgsSpatialRefSys::createFromSrid 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.utf8(), theSql.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("QgsSpatialRefSys::getRecord...trying system srs.db");
int myColumnCount = sqlite3_column_count(myPreparedStatement);
//loop through each column in the record adding its field name and vvalue 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("QgsSpatialRefSys::getRecord...trying system qgis.db");
sqlite3_finalize(myPreparedStatement);
sqlite3_close(myDatabase);
myDatabaseFileName = QgsApplication::qgisUserDbFilePath();
QFileInfo myFileInfo;
myFileInfo.setFile(myDatabaseFileName);
if ( !myFileInfo.exists( ) )
{
QgsLogger::warning("QgsSpatialRefSys::getRecord failed : users qgis.db not found");
return myMap;
}
//check the db is available
myResult = openDb(myDatabaseFileName, &myDatabase);
if(myResult)
{
return myMap;
}
myResult = sqlite3_prepare(myDatabase, theSql.utf8(), theSql.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 vvalue 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
{
QgsLogger::warning("QgsSpatialRefSys::getRecord failed : " + theSql);
}
}
sqlite3_finalize(myPreparedStatement);
sqlite3_close(myDatabase);
#ifdef QGISDEBUG
QgsDebugMsg("QgsSpatialRefSys::getRecord retrieved: " + theSql);
RecordMap::Iterator it;
for ( it = myMap.begin(); it != myMap.end(); ++it )
{
QgsDebugMsgLevel(it.key() + " => " + it.data(), 2);
}
#endif
return myMap;
}
// Accessors -----------------------------------
/*! Get the SrsId
* @return long theSrsId The internal sqlite3 srs.db primary key for this srs
*/
long QgsSpatialRefSys::srsid() const
{
return mSrsId;
}
/*! Get the Postgis SRID - if possible
* @return long theSRID The internal postgis SRID for this SRS
*/
long QgsSpatialRefSys::srid() const
{
return mSRID;
}
/*! Get the Description
* @return QString the Description A textual description of the srs.
*/
QString QgsSpatialRefSys::description () const
{
if (mDescription.isNull())
{
return "";
}
else
{
return mDescription;
}
}
/*! Get the Projection Acronym
* @return QString theProjectionAcronym The official proj4 acronym for the projection family
*/
QString QgsSpatialRefSys::projectionAcronym() const
{
if (mProjectionAcronym.isNull())
{
return "";
}
else
{
return mProjectionAcronym;
}
}
/*! Get the Ellipsoid Acronym
* @return QString theEllipsoidAcronym The official proj4 acronym for the ellipoid
*/
QString QgsSpatialRefSys::ellipsoidAcronym () const
{
if (mEllipsoidAcronym.isNull())
{
return "";
}
else
{
return mEllipsoidAcronym;
}
}
/* Get the Proj Proj4String.
* @return QString theProj4String Proj4 format specifies that define this srs.
*/
QString QgsSpatialRefSys::proj4String() const
{
if(!mIsValidFlag)
return "";
QString proj4String;
char *proj4src = NULL;
OSRExportToProj4(mSRS, &proj4src);
proj4String = proj4src;
CPLFree(proj4src);
return proj4String;
}
/*! Get this Geographic? flag
* @return bool theGeoFlag Whether this is a geographic or projected coordinate system
*/
bool QgsSpatialRefSys::geographicFlag () const
{
return mGeoFlag;
}
/*! Get the units that the projection is in
* @return QGis::units
*/
QGis::units QgsSpatialRefSys::mapUnits() const
{
return mMapUnits;
}
/*! Set the postgis srid for this srs
* @return long theSRID the Postgis spatial_ref_sys identifier for this srs (defaults to 0)
*/
long QgsSpatialRefSys::postgisSrid () const
{
return mSRID ;
}
/*! Set the EPSG identifier for this srs
* @return long theEpsg the ESPG identifier for this srs (defaults to 0)
*/
long QgsSpatialRefSys::epsg () const
{
return mEpsg;
}
// Mutators -----------------------------------
void QgsSpatialRefSys::setSrsId(long theSrsId)
{
mSrsId = theSrsId;
}
void QgsSpatialRefSys::setSrid(long theSrid)
{
mSRID=theSrid;
}
void QgsSpatialRefSys::setDescription (QString theDescription)
{
mDescription = theDescription;
}
void QgsSpatialRefSys::setProj4String (QString theProj4String)
{
mIsValidFlag = OSRImportFromProj4(mSRS, (const char *)theProj4String.latin1())==OGRERR_NONE;
}
void QgsSpatialRefSys::setGeographicFlag (bool theGeoFlag)
{
mGeoFlag=theGeoFlag;
}
void QgsSpatialRefSys::setEpsg (long theEpsg)
{
mEpsg=theEpsg;
}
void QgsSpatialRefSys::setProjectionAcronym(QString theProjectionAcronym)
{
mProjectionAcronym=theProjectionAcronym;
}
void QgsSpatialRefSys::setEllipsoidAcronym(QString theEllipsoidAcronym)
{
mEllipsoidAcronym=theEllipsoidAcronym;
}
/*! Work out the projection units and set the appropriate local variable
*
*/
void QgsSpatialRefSys::setMapUnits()
{
if (!mIsValidFlag)
{
QgsLogger::warning("No valid projection. Unable to set map units.");
mMapUnits = QGis::UNKNOWN;
return;
}
char *unitName;
// Of interest to us is that this call adds in a unit parameter if
// one doesn't already exist.
OSRFixup(mSRS);
if (OSRIsProjected(mSRS))
{
double toMeter = OSRGetLinearUnits(mSRS,&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
{
QgsLogger::warning("Unsupported map units of " + unit);
mMapUnits = QGis::UNKNOWN;
}
}
else
{
OSRGetAngularUnits(mSRS, &unitName);
QString unit(unitName);
if (unit == "degree")
mMapUnits = QGis::DEGREES;
else
{
QgsLogger::warning("Unsupported map units of " + unit);
mMapUnits = QGis::UNKNOWN;
}
QgsDebugMsg("Projection has angular units of " + unit);
}
}
/*
* 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 QgsSpatialRefSys::findMatchingProj()
{
QgsDebugMsg("QgsSpatialRefSys::findMatchingProj...");
if (mEllipsoidAcronym.isNull() || mProjectionAcronym.isNull() || !mIsValidFlag)
{
QgsLogger::warning("QgsSpatialRefSys::findMatchingProj will only work if prj acr ellipsoid acr and proj4string are set!...");
return 0;
}
sqlite3 *myDatabase;
const char *myTail;
sqlite3_stmt *myPreparedStatement;
int myResult;
// Set up the query to retreive 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.utf8(), mySql.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("QgsSpatialRefSys::findMatchingProj -------> MATCH FOUND in srs.db srsid: " + mySrsId);
// close the sqlite3 statement
sqlite3_finalize(myPreparedStatement);
sqlite3_close(myDatabase);
return mySrsId.toLong();
}
else
{
//std::cout << " Not matched : " << myProj4String << std::endl;
}
}
}
QgsLogger::warning("QgsSpatialRefSys::findMatchingProj ------->"
"\n 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.utf8(), mySql.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("QgsSpatialRefSys::findMatchingProj -------> MATCH FOUND in user qgis.db srsid: " + mySrsId);
// close the sqlite3 statement
sqlite3_finalize(myPreparedStatement);
sqlite3_close(myDatabase);
return mySrsId.toLong();
}
else
{
//std::cout << " Not matched : " << myProj4String << std::endl;
}
}
}
QgsLogger::warning("QgsSpatialRefSys::findMatchingProj -------> no match found in user db");
// close the sqlite3 statement
sqlite3_finalize(myPreparedStatement);
sqlite3_close(myDatabase);
return 0;
}
bool QgsSpatialRefSys::operator==(const QgsSpatialRefSys &theSrs)
{
if (!mIsValidFlag || !theSrs.mIsValidFlag)
{
return false;
}
else if (OSRIsGeographic(mSRS) && OSRIsGeographic(theSrs.mSRS))
{
// qWarning("QgsSpatialRefSys::operator== srs1 and srs2 are geographic ");
return OSRIsSameGeogCS(mSRS,theSrs.mSRS);
}
else if (OSRIsProjected(mSRS) && OSRIsProjected(theSrs.mSRS))
{
// qWarning("QgsSpatialRefSys::operator== srs1 and srs2 are projected ");
return OSRIsSame(mSRS, theSrs.mSRS);
}
else
{
return false;
}
}
bool QgsSpatialRefSys::operator!=(const QgsSpatialRefSys &theSrs)
{
return ! (*this == theSrs);
}
bool QgsSpatialRefSys::equals(QString theProj4String)
{
QgsSpatialRefSys r;
r.setProj4String(theProj4String);
return *this==r;
}
QString QgsSpatialRefSys::toWkt() const
{
QString myWkt;
char* WKT;
if(OSRExportToWkt(mSRS,&WKT) == OGRERR_NONE)
{
myWkt = WKT;
OGRFree(WKT);
}
return myWkt;
}
bool QgsSpatialRefSys::readXML( QDomNode & theNode )
{
QgsDebugMsg("Reading Spatial Ref Sys from xml ------------------------!");
QDomNode srsNode = theNode.namedItem( "spatialrefsys" );
if ( ! srsNode.isNull() )
{
QDomNode myNode = srsNode.namedItem("proj4");
QDomElement myElement = myNode.toElement();
setProj4String(myElement.text());
myNode = srsNode.namedItem("srsid");
myElement = myNode.toElement();
setSrsId(myElement.text().toLong());
myNode = srsNode.namedItem("srid");
myElement = myNode.toElement();
setSrid(myElement.text().toLong());
myNode = srsNode.namedItem("epsg");
myElement = myNode.toElement();
setEpsg(myElement.text().toLong());
myNode = srsNode.namedItem("description");
myElement = myNode.toElement();
setDescription(myElement.text());
myNode = srsNode.namedItem("projectionacronym");
myElement = myNode.toElement();
setProjectionAcronym(myElement.text());
myNode = srsNode.namedItem("ellipsoidacronym");
myElement = myNode.toElement();
setEllipsoidAcronym(myElement.text());
myNode = srsNode.namedItem("geographicflag");
myElement = myNode.toElement();
if (myElement.text().compare("true"))
{
setGeographicFlag(true);
}
else
{
setGeographicFlag(false);
}
//make sure the map units have been set
setMapUnits();
//@TODO this srs needs to be validated!!!
mIsValidFlag=true;//shamelessly hard coded for now
}
else
{
// Return default SRS if none was found in the XML.
createFromSrsId(GEOSRS_ID);
}
return true;
}
bool QgsSpatialRefSys::writeXML( QDomNode & theNode, QDomDocument & theDoc ) const
{
QDomElement myLayerNode = theNode.toElement();
QDomElement mySrsElement = theDoc.createElement( "spatialrefsys" );
QDomElement myProj4Element = theDoc.createElement( "proj4" );
myProj4Element.appendChild(theDoc.createTextNode( proj4String()));
mySrsElement.appendChild(myProj4Element);
QDomElement mySrsIdElement = theDoc.createElement( "srsid" );
mySrsIdElement.appendChild(theDoc.createTextNode( QString::number(srsid())));
mySrsElement.appendChild(mySrsIdElement);
QDomElement mySridElement = theDoc.createElement( "srid" );
mySridElement.appendChild(theDoc.createTextNode( QString::number(srid())));
mySrsElement.appendChild(mySridElement);
QDomElement myEpsgElement = theDoc.createElement( "epsg" );
myEpsgElement.appendChild(theDoc.createTextNode( QString::number(epsg())));
mySrsElement.appendChild(myEpsgElement);
QDomElement myDescriptionElement = theDoc.createElement( "description" );
myDescriptionElement.appendChild(theDoc.createTextNode( description()));
mySrsElement.appendChild(myDescriptionElement);
QDomElement myProjectionAcronymElement = theDoc.createElement( "projectionacronym" );
myProjectionAcronymElement.appendChild(theDoc.createTextNode( projectionAcronym()));
mySrsElement.appendChild(myProjectionAcronymElement);
QDomElement myEllipsoidAcronymElement = theDoc.createElement( "ellipsoidacronym" );
myEllipsoidAcronymElement.appendChild(theDoc.createTextNode( ellipsoidAcronym()));
mySrsElement.appendChild(myEllipsoidAcronymElement);
QDomElement myGeographicFlagElement = theDoc.createElement( "geographicflag" );
QString myGeoFlagText = "false";
if (geographicFlag())
{
myGeoFlagText="true";
}
myGeographicFlagElement.appendChild(theDoc.createTextNode( myGeoFlagText ));
mySrsElement.appendChild(myGeographicFlagElement);
myLayerNode.appendChild( mySrsElement );
return true;
}