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https://github.com/qgis/QGIS.git
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Updated qgsspatialref - centralising sqlite calls (in progress) and implementing cmparitors for wkt and proj4 string so that a matchin rec (if any)can be retrieved from the database. In progress.
git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@3409 c8812cc2-4d05-0410-92ff-de0c093fc19c
This commit is contained in:
timlinux
parent
060ac1f52f
commit
2dc3552f12
@ -3,6 +3,8 @@
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Version 0.6 'Simon' .... development version
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QGIS Change Log
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2005-04-17 [timlinux] 0.6devel23
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** Numerous fixes and clean ups to projection handling
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2005-05-15 [morb_au] 0.6devel21
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** Fixed a memory leak in the postgres provider when retrieving features
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** Raster layers now align to the map canvas with subpixel source accuracy
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@ -25,7 +25,7 @@ dnl ---------------------------------------------------------------------------
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MAJOR_VERSION=0
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MINOR_VERSION=6
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MICRO_VERSION=0
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EXTRA_VERSION=22
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EXTRA_VERSION=23
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if test $EXTRA_VERSION -eq 0; then
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VERSION=${MAJOR_VERSION}.${MINOR_VERSION}.${MICRO_VERSION}
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else
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@ -26,7 +26,7 @@
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QgsSpatialRefSys::QgsSpatialRefSys() : mMapUnits(QGis::UNKNOWN) {}
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QgsSpatialRefSys::QgsSpatialRefSys(QString theWkt) : mMapUnits(QGis::UNKNOWN)
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QgsSpatialRefSys::QgsSpatialRefSys(QString theWkt) : mMapUnits(QGis::UNKNOWN)
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{
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createFromWkt(theWkt);
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}
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@ -39,10 +39,10 @@ QgsSpatialRefSys::QgsSpatialRefSys(long theSrsId,
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long theSRID,
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long theEpsg,
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bool theGeoFlag)
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: mMapUnits(QGis::UNKNOWN)
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: mMapUnits(QGis::UNKNOWN)
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{}
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QgsSpatialRefSys::QgsSpatialRefSys(const long theId, SRS_TYPE theType) : mMapUnits(QGis::UNKNOWN)
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QgsSpatialRefSys::QgsSpatialRefSys(const long theId, SRS_TYPE theType) : mMapUnits(QGis::UNKNOWN)
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{
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switch (theType)
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{
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@ -70,7 +70,7 @@ void QgsSpatialRefSys::validate()
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#ifdef QGISDEBUG
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std::cout << " QgsSpatialRefSys::validate" << std::endl;
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#endif
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//dont bother trying to do an initial test with gdal if
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//dont bother trying to do an initial test with gdal if
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//the proj4String is not even populated
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if (QString::null!=mProj4String && !mProj4String.isEmpty())
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{
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@ -162,7 +162,7 @@ void QgsSpatialRefSys::validate()
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}
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void QgsSpatialRefSys::createFromSrid(long theSrid)
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bool QgsSpatialRefSys::createFromSrid(long theSrid)
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{
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#ifdef QGISDEBUG
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std::cout << " QgsSpatialRefSys::createFromSrid" << std::endl;
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@ -232,17 +232,19 @@ void QgsSpatialRefSys::createFromSrid(long theSrid)
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}
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sqlite3_finalize(myPreparedStatement);
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sqlite3_close(myDatabase);
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return isValidFlag;
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}
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void QgsSpatialRefSys::createFromWkt(QString theWkt)
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bool QgsSpatialRefSys::createFromWkt(QString theWkt)
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{
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if (!theWkt)
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{
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std::cout << "QgsSpatialRefSys::createFromWkt -- theWkt is uninitialised, operation failed" << std::endl;
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return;
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isValidFlag==false;
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return false;
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}
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#ifdef QGISDEBUG
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std::cout << "QgsSpatialRefSys::createFromWkt(QString theWkt) using: \n" << theWkt << std::endl;
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std::cout << "QgsSpatialRefSys::createFromWkt(QString theWkt) using: \n" << theWkt << std::endl;
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#endif
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//this is really ugly but we need to get a QString to a char**
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char *myCharArrayPointer = (char *)theWkt.latin1();
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@ -269,7 +271,8 @@ void QgsSpatialRefSys::createFromWkt(QString theWkt)
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std::cout << "This SRS could *** NOT *** be set from the supplied WKT " << std::endl;
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std::cout << "INPUT: " << std::endl << theWkt << std::endl;
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std::cout << "^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^" << std::endl;
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return;
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isValidFlag==false;
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return false;
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}
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@ -279,13 +282,15 @@ void QgsSpatialRefSys::createFromWkt(QString theWkt)
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char *proj4src;
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myOgrSpatialRef.exportToProj4(&proj4src);
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//XXX TODO split out projext and ellipsoid acronym from the parameters
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mProj4String=QString(proj4src);
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setMapUnits();
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//now that we have the proj4string, delegate to createFromProj4String so
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// that we can try to fill in the remaining class members...
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//create from Proj wil set the isValidFalg
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createFromProj4(QString(proj4src));
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return isValidFlag;
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//setMapunits will be called by createfromproj above
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}
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void QgsSpatialRefSys::createFromEpsg(long theEpsg)
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bool QgsSpatialRefSys::createFromEpsg(long theEpsg)
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{
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#ifdef QGISDEBUG
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std::cout << " QgsSpatialRefSys::createFromEpsg" << std::endl;
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@ -353,14 +358,15 @@ void QgsSpatialRefSys::createFromEpsg(long theEpsg)
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}
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sqlite3_finalize(myPreparedStatement);
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sqlite3_close(myDatabase);
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return isValidFlag;
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}
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void QgsSpatialRefSys::createFromSrsId (long theSrsId)
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bool QgsSpatialRefSys::createFromSrsId (long theSrsId)
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{
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#ifdef QGISDEBUG
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std::cout << " QgsSpatialRefSys::createFromSrsId" << std::endl;
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#endif
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#endif
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QString myDatabaseFileName;
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//
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// Determine if this is a user projection or a system on
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@ -375,7 +381,7 @@ void QgsSpatialRefSys::createFromSrsId (long theSrsId)
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{
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isValidFlag==false;
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std::cout << " QgsSpatialRefSys::createFromSrid failed : users qgis.db not found" << std::endl;
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return;
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return isValidFlag;
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}
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}
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else //must be a system projection then
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@ -443,6 +449,7 @@ void QgsSpatialRefSys::createFromSrsId (long theSrsId)
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}
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sqlite3_finalize(myPreparedStatement);
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sqlite3_close(myDatabase);
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return isValidFlag;
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}
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@ -467,51 +474,201 @@ bool QgsSpatialRefSys::isValid() const
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}
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}
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void QgsSpatialRefSys::createFromProj4 (const QString theProj4String)
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bool QgsSpatialRefSys::createFromProj4 (const QString theProj4String)
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{
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//
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// Example:
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// +proj=tmerc +lat_0=0 +lon_0=-62 +k=0.999500 +x_0=400000 +y_0=0
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// +proj=tmerc +lat_0=0 +lon_0=-62 +k=0.999500 +x_0=400000 +y_0=0
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// +ellps=clrk80 +towgs84=-255,-15,71,0,0,0,0 +units=m +no_defs
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//
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//
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QRegExp myProjRegExp( "\\+proj=[a-zA-Z]* " );
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QRegExp myProjRegExp( "\\+proj=[a-zA-Z]* " );
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int myStart= 0;
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int myLength=0;
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myStart = myProjRegExp.search(theProj4String, myStart);
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if (myStart==-1)
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{
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std::cout << "QgsSpatialRefSys::createFromProj4 error proj string supplied has no +proj argument" << std::endl;
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isValidFlag=false;
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return isValidFlag;
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}
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else
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{
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myLength = myProjRegExp.matchedLength();
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}
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mProjectionAcronym = theProj4String.mid(myStart+PROJ_PREFIX_LEN,myLength);
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QRegExp myEllipseRegExp( "\\+ellps=[a-zA-Z]* " );
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QRegExp myEllipseRegExp( "\\+ellps=[a-zA-Z]* " );
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myStart= 0;
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myLength=0;
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myStart = myEllipseRegExp.search(theProj4String, myStart);
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if (myStart==-1)
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{
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std::cout << "QgsSpatialRefSys::createFromProj4 error proj string supplied has no +ellps argument" << std::endl;
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isValidFlag=false;
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return isValidFlag;
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}
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else
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{
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myLength = myEllipseRegExp.matchedLength();
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}
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mEllipsoidAcronym = theProj4String.mid(myStart+ELLPS_PREFIX_LEN,myLength);
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setMapUnits();
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}
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// Accessors -----------------------------------
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/*
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* We try to match the proj string to and srsid using the following logic:
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*
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* - perform a whole text search on srs name (if not null). The srs name will
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* have been set if this method has been delegated to from createFromWkt.
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*/
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getRecord("select * from tbl_srs where where parameters='" + mProj4String + "'");
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/*
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* - if the above does not match perform a whole text search on proj4 string (if not null)
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*/
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/*
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* - if none of the above match convert the proj4 string to an OGR SRS
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* then check if its a geocs or a proj cs (using ogr isGeographic)
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* then sequentially walk through the database (first users qgis.db srs tbl then
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* system srs.db tbl), converting each entry into an ogr srs and using isSame
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* or isSameGeocs (essentially calling the == overloaded operator). We'll try to
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* be smart about this and first parse out the proj and ellpse strings and only
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* check for a match in entities that have the same ellps and proj entries so
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* that it doesnt munch yer cpu so much.
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*/
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setMapUnits();
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isValidFlag=true;
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return isValidFlag;
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}
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QgsSpatialRefSys::RecordMap QgsSpatialRefSys::getRecord(QString theSql)
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{
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QString myDatabaseFileName;
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QgsSpatialRefSys::RecordMap myMap;
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QString myFieldName;
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QString myFieldValue;
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sqlite3 *myDatabase;
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char *myErrorMessage = 0;
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const char *myTail;
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sqlite3_stmt *myPreparedStatement;
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int myResult;
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#ifdef QGISDEBUG
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std::cout << " QgsSpatialRefSys::getRecord...running query:\n"<< theSql << "\n" << std::endl;
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std::cout << " QgsSpatialRefSys::getRecord...trying system srs.db" << std::endl;
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#endif
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// Get the package data path and set the full path name to the sqlite3 spatial reference
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// database.
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#if defined(Q_OS_MACX) || defined(WIN32)
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QString PKGDATAPATH = qApp->applicationDirPath() + "/share/qgis";
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#endif
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myDatabaseFileName = PKGDATAPATH;
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myDatabaseFileName += "/resources/srs.db";
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//check the db is available
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myResult = sqlite3_open(myDatabaseFileName.latin1(), &myDatabase);
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if(myResult)
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{
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std::cout << "Can't open database: " << sqlite3_errmsg(myDatabase) << std::endl;
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// XXX This will likely never happen since on open, sqlite creates the
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// database if it does not exist.
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assert(myResult == 0);
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}
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myResult = sqlite3_prepare(myDatabase, (const char *)theSql, theSql.length(), &myPreparedStatement, &myTail);
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// XXX Need to free memory from the error msg if one is set
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if(myResult == SQLITE_OK)
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{
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sqlite3_step(myPreparedStatement) == SQLITE_ROW;
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int myColumnCount = sqlite3_column_count(myPreparedStatement);
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//loop through each column in the record adding its field name and vvalue to the map
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for (int myColNo=0;myColNo < myColumnCount;myColNo++)
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{
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myFieldName = QString ((char *)sqlite3_column_name(myPreparedStatement,myColNo));
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myFieldValue = QString ((char *)sqlite3_column_text(myPreparedStatement,myColNo));
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myMap[myFieldName]=myFieldValue;
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}
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}
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else
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{
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#ifdef QGISDEBUG
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std::cout << " QgsSpatialRefSys::getRecord...trying system users.db" << std::endl;
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#endif
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sqlite3_finalize(myPreparedStatement);
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sqlite3_close(myDatabase);
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myDatabaseFileName = QDir::homeDirPath () + "/.qgis/qgis.db";
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QFileInfo myFileInfo;
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myFileInfo.setFile(myDatabaseFileName);
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if ( !myFileInfo.exists( ) )
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{
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std::cout << " QgsSpatialRefSys::getRecord failed : users qgis.db not found" << std::endl;
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return myMap;
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}
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//check the db is available
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myResult = sqlite3_open(myDatabaseFileName.latin1(), &myDatabase);
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if(myResult)
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{
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std::cout << "Can't open database: " << sqlite3_errmsg(myDatabase) << std::endl;
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// XXX This will likely never happen since on open, sqlite creates the
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// database if it does not exist.
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assert(myResult == 0);
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}
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myResult = sqlite3_prepare(myDatabase, (const char *)theSql, theSql.length(), &myPreparedStatement, &myTail);
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// XXX Need to free memory from the error msg if one is set
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if(myResult == SQLITE_OK)
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{
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sqlite3_step(myPreparedStatement) == SQLITE_ROW;
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int myColumnCount = sqlite3_column_count(myPreparedStatement);
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//loop through each column in the record adding its field name and vvalue to the map
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for (int myColNo=0;myColNo < myColumnCount;myColNo++)
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{
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myFieldName = QString ((char *)sqlite3_column_name(myPreparedStatement,myColNo));
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myFieldValue = QString ((char *)sqlite3_column_text(myPreparedStatement,myColNo));
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myMap[myFieldName]=myFieldValue;
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}
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}
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else
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{
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#ifdef QGISDEBUG
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std::cout << " QgsSpatialRefSys::getRecord failed : " << theSql << std::endl;
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#endif
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}
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}
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sqlite3_finalize(myPreparedStatement);
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sqlite3_close(myDatabase);
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return myMap;
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}
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// Accessors -----------------------------------
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/*! Get the SrsId
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* @return long theSrsId The internal sqlite3 srs.db primary key for this srs
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*/
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long QgsSpatialRefSys::srsid() const
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{
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return mSrsId;
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}
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/*! Get the Postgis SRID - if possible
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* @return long theSRID The internal postgis SRID for this SRS
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*/
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long QgsSpatialRefSys::srid() const
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{
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return mSRID;
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}
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/*! Get the Description
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* @return QString the Description A textual description of the srs.
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@ -534,7 +691,7 @@ QString QgsSpatialRefSys::ellipsoidAcronym () const
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{
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return mEllipsoidAcronym;
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}
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/* Get the Proj Proj4String.
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/* Get the Proj Proj4String.
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* @return QString theProj4String Proj4 format specifies that define this srs.
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*/
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QString QgsSpatialRefSys::proj4String() const
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@ -679,14 +836,16 @@ void QgsSpatialRefSys::setMapUnits()
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#ifdef QGISDEBUG
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std::cerr << "Projection has angular units of " << unit << '\n';
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#endif
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}
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}
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bool QgsSpatialRefSys::operator==(const QgsSpatialRefSys &theSrs)
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{
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qWarning("QgsSpatialRefSys::operator== called ");
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qWarning("QgsSpatialRefSys::operator== called ");
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bool myMatchFlag = true; //innocent until proven guilty
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bool myMatchFlag = true; //innocent until proven guilty
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/* Here are the possible OGR error codes :
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typedef int OGRErr;
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@ -708,7 +867,7 @@ bool QgsSpatialRefSys::operator==(const QgsSpatialRefSys &theSrs)
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//same for the projections they define to be equivalent, which is why I dont just
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//compare the proj parameter strings and return the result
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//create the sr and populate it from a wkt proj definition
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OGRSpatialReference myOgrSpatialRef1;
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OGRSpatialReference myOgrSpatialRef2;
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@ -739,14 +898,14 @@ bool QgsSpatialRefSys::operator==(const QgsSpatialRefSys &theSrs)
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//placeholder to be replaced with ogr tests
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if (myMatchFlag)
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{
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qWarning("QgsSpatialRefSys::operator== result: srs's are equal ");
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}
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else
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{
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qWarning("QgsSpatialRefSys::operator== result: srs's are not equal ");
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}
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return myMatchFlag;
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//placeholder to be replaced with ogr tests
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if (myMatchFlag)
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{
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qWarning("QgsSpatialRefSys::operator== result: srs's are equal ");
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}
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else
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{
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qWarning("QgsSpatialRefSys::operator== result: srs's are not equal ");
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}
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return myMatchFlag;
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}
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@ -9,6 +9,7 @@
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#include <qstring.h>
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#include <qstringlist.h>
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#include <qregexp.h>
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#include <qmap.h>
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//qgis includes
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#include <qgis.h>
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@ -73,7 +74,7 @@ class QgsSpatialRefSys
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* @note Any members will be overwritten during this process.
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* @param theSrid The postgis SRID for the desired spatial reference system.
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*/
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||||
void createFromSrid(const long theSrid);
|
||||
bool createFromSrid(const long theSrid);
|
||||
/*! Set up this srs using a WKT spatial ref sys definition.
|
||||
* The wkt will be converted to a proj4 string using OGR helper
|
||||
* functions. After this the srs databasses will be searched for matches.
|
||||
@ -82,23 +83,26 @@ class QgsSpatialRefSys
|
||||
* @note Any members will be overwritten during this process.
|
||||
* @note SRID and EPSG may be blank if no match can be found on srs db.
|
||||
* @param theWkt The WKT for the desired spatial reference system.
|
||||
* @return bool TRUE if sucess else false
|
||||
*/
|
||||
void createFromWkt(const QString theWkt);
|
||||
bool createFromWkt(const QString theWkt);
|
||||
/*! Set up this srs by fetching the appropriate information from the
|
||||
* sqlite backend. First the system level read only srs.db will be checked
|
||||
* and then the users ~/.qgis/qgis.db database will be checked for a match.
|
||||
* @note Any members will be overwritten during this process.
|
||||
* @param theEpsg The EPSG for the desired spatial reference system.
|
||||
* @return bool TRUE if sucess else false
|
||||
*/
|
||||
void createFromEpsg(const long theEpsg);
|
||||
bool createFromEpsg(const long theEpsg);
|
||||
/*! Set up this srs by fetching the appropriate information from the
|
||||
* sqlite backend. If the srsid is < 100000, only the system srs.db
|
||||
* will be checked. If the srsid > 100000 the srs will be retrieved from
|
||||
* the ~/.qgis/qgis.db
|
||||
* @note Any members will be overwritten during this process.
|
||||
* @param theSrsId The QGIS SrsId for the desired spatial reference system.
|
||||
* @return bool TRUE if sucess else false
|
||||
*/
|
||||
void createFromSrsId (const long theSrsId);
|
||||
bool createFromSrsId (const long theSrsId);
|
||||
|
||||
/*! Set up this srs by passing it a proj4 style formatted string.
|
||||
* The string will be parsed and the projection and ellipsoid
|
||||
@ -106,10 +110,30 @@ class QgsSpatialRefSys
|
||||
* in the parameters member. The reason for this is so that we
|
||||
* can easily present the user with 'natural language' representation
|
||||
* of the projection and ellipsoid by looking them up in the srs.bs sqlite
|
||||
* database.
|
||||
* database. Also having the ellpse and proj elements stripped out
|
||||
* is hepful to speed up globbing queries (see below).
|
||||
*
|
||||
* 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.
|
||||
* - if the above does not match perform a whole text search on proj4 string (if not null)
|
||||
* - if none of the above match convert the proj4 string to an OGR SRS
|
||||
* then check if its 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.
|
||||
*
|
||||
* @note If the srs was not matched, we will create a new entry on the users tbl_srs
|
||||
* for this srs.
|
||||
*
|
||||
* @param theProjString A proj4 format string
|
||||
* @return bool TRUE if sucess else false
|
||||
*/
|
||||
void createFromProj4 (const QString theProjString);
|
||||
bool createFromProj4 (const QString theProjString);
|
||||
|
||||
/*! Find out whether this SRS is correctly initialised and useable */
|
||||
bool isValid() const;
|
||||
@ -118,14 +142,31 @@ class QgsSpatialRefSys
|
||||
* consulted and acted on accordingly. By hell or high water this
|
||||
* method will do its best to make sure that this SRS is valid - even
|
||||
* if that involves resorting to a hard coded default of geocs:wgs84.
|
||||
*
|
||||
* @note It is not usually neccessary to use this function, unless you
|
||||
* are trying to force theis srs to be valid.
|
||||
*/
|
||||
void validate();
|
||||
|
||||
/*! A string based associative array used for passing records around */
|
||||
typedef QMap<QString, QString> RecordMap;
|
||||
/*! Get a record from the srs.db or qgis.db backends, given an sql statment.
|
||||
* @note only handles queries that return a single record.
|
||||
* @note it will first try the system srs.db then the users qgis.db!
|
||||
* @param QString The sql query to execute
|
||||
* @return QMap An associative array of field name <-> value pairs
|
||||
*/
|
||||
RecordMap getRecord(QString theSql);
|
||||
|
||||
// Accessors -----------------------------------
|
||||
|
||||
/*! Get the SrsId
|
||||
/*! Get the SrsId - if possible
|
||||
* @return long theSrsId The internal sqlite3 srs.db primary key for this srs
|
||||
*/
|
||||
long srsid() const;
|
||||
/*! Get the Postgis SRID - if possible.
|
||||
* @return long theSRID The internal postgis SRID for this SRS
|
||||
*/
|
||||
long srid() const;
|
||||
/*! Get the Description
|
||||
* @return QString the Description A textual description of the srs.
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user