//
// distance of point q from line through p in direction v
// return >0 => q lies left of the line
// <0 => q lies right of the line
//
double QgsGeometryValidator::distLine2Point( const QgsPoint& p, QgsVector v, const QgsPoint& q )
{
if ( qgsDoubleNear( v.length(), 0 ) )
{
throw QgsException( QObject::tr( "invalid line" ) );
}
return ( v.x()*( q.y() - p.y() ) - v.y()*( q.x() - p.x() ) ) / v.length();
}
QgsVector QgsVector::normalized() const
{
double len = length();
if ( len == 0.0 )
{
throw QgsException( QStringLiteral( "normalized vector of null vector undefined" ) );
}
return *this / len;
}
QgsVector QgsVector::normal() const
{
double len = length();
if ( len == 0.0 )
{
throw QgsException( "normal vector of null vector undefined" );
}
return *this / len;
}
/**
@note it's presumed that the caller has already reset the map canvas, map
registry, and legend
*/
bool QgsProject::read()
{
std::auto_ptr< QDomDocument > doc =
std::auto_ptr < QDomDocument > ( new QDomDocument( "qgis" ) );
if ( !imp_->file.open( QIODevice::ReadOnly ) )
{
imp_->file.close(); // even though we got an error, let's make
// sure it's closed anyway
throw QgsIOException( QObject::tr( "Unable to open " ) + imp_->file.fileName() );
}
// location of problem associated with errorMsg
int line, column;
QString errorMsg;
if ( !doc->setContent( &imp_->file, &errorMsg, &line, &column ) )
{
// want to make this class as GUI independent as possible; so commented out
// QMessageBox::critical( 0x0, "Project File Read Error",
// errorMsg + " at line " + QString::number( line ) +
// " column " + QString::number( column ) );
QString errorString = QObject::tr( "Project file read error: " ) +
errorMsg + QObject::tr( " at line " ) + QString::number( line ) + QObject::tr( " column " ) +
QString::number( column );
qDebug( "%s", errorString.toUtf8().constData() );
imp_->file.close();
throw QgsException( errorString + QObject::tr( " for file " ) + imp_->file.fileName() );
}
imp_->file.close();
QgsDebugMsg( "Opened document " + imp_->file.fileName() );
QgsDebugMsg( "Project title: " + imp_->title );
// get project version string, if any
QgsProjectVersion fileVersion = _getVersion( *doc );
QgsProjectVersion thisVersion( QGis::QGIS_VERSION );
if ( thisVersion > fileVersion )
{
QgsLogger::warning( "Loading a file that was saved with an older "
"version of qgis (saved in " + fileVersion.text() +
", loaded in " + QGis::QGIS_VERSION +
"). Problems may occur." );
QgsProjectFileTransform projectFile( *doc, fileVersion );
//! Shows a warning when an old project file is read.
emit oldProjectVersionWarning( fileVersion.text() );
QgsDebugMsg( "Emitting oldProjectVersionWarning(oldVersion)." );
projectFile.dump();
projectFile.updateRevision( thisVersion );
projectFile.dump();
}
// before we start loading everything, let's clear out the current set of
// properties first so that we don't have the properties from the previous
// project still hanging around
imp_->clear();
// now get any properties
_getProperties( *doc, imp_->properties_ );
QgsDebugMsg( QString::number( imp_->properties_.count() ) + " properties read" );
dump_( imp_->properties_ );
// restore the canvas' area of interest
// now get project title
_getTitle( *doc, imp_->title );
// get the map layers
std::pair< bool, std::list<QDomNode> > getMapLayersResults = _getMapLayers( *doc );
// review the integrity of the retrieved map layers
if ( ! getMapLayersResults.first )
{
QgsDebugMsg( "Unable to get map layers from project file." );
if ( ! getMapLayersResults.second.empty() )
{
QgsDebugMsg( "there are " + QString::number( getMapLayersResults.second.size() ) + " broken layers" );
}
// Since we could be executing this from the test harness which
// doesn't *have* layers -- nor a GUI for that matter -- we'll just
// leave in the whining and boldly stomp on.
emit readProject( *doc );
throw QgsProjectBadLayerException( getMapLayersResults.second );
// return false;
}
// read the project: used by map canvas and legend
emit readProject( *doc );
// can't be dirty since we're allegedly in pristine state
dirty( false );
return true;
} // QgsProject::read