QMap< QString, QString > QgsMapToolIdentify::featureDerivedAttributes( QgsFeature *feature, QgsMapLayer *layer )
{
// Calculate derived attributes and insert:
// measure distance or area depending on geometry type
QMap< QString, QString > derivedAttributes;
// init distance/area calculator
QString ellipsoid = QgsProject::instance()->readEntry( "Measure", "/Ellipsoid", GEO_NONE );
QgsDistanceArea calc;
calc.setEllipsoidalMode( mCanvas->hasCrsTransformEnabled() );
calc.setEllipsoid( ellipsoid );
calc.setSourceCrs( layer->crs().srsid() );
QGis::WkbType wkbType = QGis::WKBNoGeometry;
QGis::GeometryType geometryType = QGis::NoGeometry;
if ( feature->geometry() )
{
geometryType = feature->geometry()->type();
wkbType = feature->geometry()->wkbType();
}
if ( geometryType == QGis::Line )
{
double dist = calc.measure( feature->geometry() );
QGis::UnitType myDisplayUnits;
convertMeasurement( calc, dist, myDisplayUnits, false );
QString str = calc.textUnit( dist, 3, myDisplayUnits, false ); // dist and myDisplayUnits are out params
derivedAttributes.insert( tr( "Length" ), str );
if ( wkbType == QGis::WKBLineString || wkbType == QGis::WKBLineString25D )
{
// Add the start and end points in as derived attributes
QgsPoint pnt = mCanvas->mapSettings().layerToMapCoordinates( layer, feature->geometry()->asPolyline().first() );
str = QLocale::system().toString( pnt.x(), 'g', 10 );
derivedAttributes.insert( tr( "firstX", "attributes get sorted; translation for lastX should be lexically larger than this one" ), str );
str = QLocale::system().toString( pnt.y(), 'g', 10 );
derivedAttributes.insert( tr( "firstY" ), str );
pnt = mCanvas->mapSettings().layerToMapCoordinates( layer, feature->geometry()->asPolyline().last() );
str = QLocale::system().toString( pnt.x(), 'g', 10 );
derivedAttributes.insert( tr( "lastX", "attributes get sorted; translation for firstX should be lexically smaller than this one" ), str );
str = QLocale::system().toString( pnt.y(), 'g', 10 );
derivedAttributes.insert( tr( "lastY" ), str );
}
}
else if ( geometryType == QGis::Polygon )
{
double area = calc.measure( feature->geometry() );
double perimeter = calc.measurePerimeter( feature->geometry() );
QGis::UnitType myDisplayUnits;
convertMeasurement( calc, area, myDisplayUnits, true ); // area and myDisplayUnits are out params
QString str = calc.textUnit( area, 3, myDisplayUnits, true );
derivedAttributes.insert( tr( "Area" ), str );
convertMeasurement( calc, perimeter, myDisplayUnits, false ); // perimeter and myDisplayUnits are out params
str = calc.textUnit( perimeter, 3, myDisplayUnits, false );
derivedAttributes.insert( tr( "Perimeter" ), str );
}
else if ( geometryType == QGis::Point &&
( wkbType == QGis::WKBPoint || wkbType == QGis::WKBPoint25D ) )
{
// Include the x and y coordinates of the point as a derived attribute
QgsPoint pnt = mCanvas->mapSettings().layerToMapCoordinates( layer, feature->geometry()->asPoint() );
QString str = QLocale::system().toString( pnt.x(), 'g', 10 );
derivedAttributes.insert( "X", str );
str = QLocale::system().toString( pnt.y(), 'g', 10 );
derivedAttributes.insert( "Y", str );
}
return derivedAttributes;
}
QMap< QString, QString > QgsMapToolIdentify::featureDerivedAttributes( QgsFeature *feature, QgsMapLayer *layer, const QgsPoint& layerPoint )
{
// Calculate derived attributes and insert:
// measure distance or area depending on geometry type
QMap< QString, QString > derivedAttributes;
// init distance/area calculator
QString ellipsoid = QgsProject::instance()->readEntry( "Measure", "/Ellipsoid", GEO_NONE );
QgsDistanceArea calc;
calc.setEllipsoidalMode( mCanvas->hasCrsTransformEnabled() );
calc.setEllipsoid( ellipsoid );
calc.setSourceCrs( layer->crs().srsid() );
QgsWKBTypes::Type wkbType = QgsWKBTypes::NoGeometry;
QGis::GeometryType geometryType = QGis::NoGeometry;
QgsVertexId vId;
QgsPointV2 closestPoint;
if ( feature->constGeometry() )
{
geometryType = feature->constGeometry()->type();
wkbType = feature->constGeometry()->geometry()->wkbType();
//find closest vertex to clicked point
closestPoint = QgsGeometryUtils::closestVertex( *feature->constGeometry()->geometry(), QgsPointV2( layerPoint.x(), layerPoint.y() ), vId );
}
if ( QgsWKBTypes::isMultiType( wkbType ) )
{
QString str = QLocale::system().toString( static_cast<QgsGeometryCollectionV2*>( feature->constGeometry()->geometry() )->numGeometries() );
derivedAttributes.insert( tr( "Parts" ), str );
str = QLocale::system().toString( vId.part + 1 );
derivedAttributes.insert( tr( "Part number" ), str );
}
if ( geometryType == QGis::Line )
{
const QgsPolyline &pline = feature->constGeometry()->asPolyline();
double dist = calc.measureLength( feature->constGeometry() );
QGis::UnitType myDisplayUnits;
convertMeasurement( calc, dist, myDisplayUnits, false );
QString str = calc.textUnit( dist, 3, myDisplayUnits, false ); // dist and myDisplayUnits are out params
derivedAttributes.insert( tr( "Length" ), str );
str = QLocale::system().toString( pline.size() );
derivedAttributes.insert( tr( "Vertices" ), str );
//add details of closest vertex to identify point
closestVertexAttributes( *feature->constGeometry()->geometry(), vId, layer, derivedAttributes );
if ( QgsWKBTypes::flatType( wkbType ) == QgsWKBTypes::LineString )
{
// Add the start and end points in as derived attributes
QgsPoint pnt = mCanvas->mapSettings().layerToMapCoordinates( layer, pline.first() );
str = QLocale::system().toString( pnt.x(), 'g', 10 );
derivedAttributes.insert( tr( "firstX", "attributes get sorted; translation for lastX should be lexically larger than this one" ), str );
str = QLocale::system().toString( pnt.y(), 'g', 10 );
derivedAttributes.insert( tr( "firstY" ), str );
pnt = mCanvas->mapSettings().layerToMapCoordinates( layer, pline.last() );
str = QLocale::system().toString( pnt.x(), 'g', 10 );
derivedAttributes.insert( tr( "lastX", "attributes get sorted; translation for firstX should be lexically smaller than this one" ), str );
str = QLocale::system().toString( pnt.y(), 'g', 10 );
derivedAttributes.insert( tr( "lastY" ), str );
}
}
else if ( geometryType == QGis::Polygon )
{
double area = calc.measureArea( feature->constGeometry() );
double perimeter = calc.measurePerimeter( feature->constGeometry() );
QGis::UnitType myDisplayUnits;
convertMeasurement( calc, area, myDisplayUnits, true ); // area and myDisplayUnits are out params
QString str = calc.textUnit( area, 3, myDisplayUnits, true );
derivedAttributes.insert( tr( "Area" ), str );
convertMeasurement( calc, perimeter, myDisplayUnits, false ); // perimeter and myDisplayUnits are out params
str = calc.textUnit( perimeter, 3, myDisplayUnits, false );
derivedAttributes.insert( tr( "Perimeter" ), str );
str = QLocale::system().toString( feature->constGeometry()->geometry()->nCoordinates() );
derivedAttributes.insert( tr( "Vertices" ), str );
//add details of closest vertex to identify point
closestVertexAttributes( *feature->constGeometry()->geometry(), vId, layer, derivedAttributes );
}
else if ( geometryType == QGis::Point &&
QgsWKBTypes::flatType( wkbType ) == QgsWKBTypes::Point )
{
// Include the x and y coordinates of the point as a derived attribute
QgsPoint pnt = mCanvas->mapSettings().layerToMapCoordinates( layer, feature->constGeometry()->asPoint() );
QString str = QLocale::system().toString( pnt.x(), 'g', 10 );
derivedAttributes.insert( "X", str );
str = QLocale::system().toString( pnt.y(), 'g', 10 );
derivedAttributes.insert( "Y", str );
if ( QgsWKBTypes::hasZ( wkbType ) )
{
str = QLocale::system().toString( static_cast<QgsPointV2*>( feature->constGeometry()->geometry() )->z(), 'g', 10 );
derivedAttributes.insert( "Z", str );
}
if ( QgsWKBTypes::hasM( wkbType ) )
{
str = QLocale::system().toString( static_cast<QgsPointV2*>( feature->constGeometry()->geometry() )->m(), 'g', 10 );
derivedAttributes.insert( "M", str );
}
}
return derivedAttributes;
}
bool QgsMapToolIdentify::identifyVectorLayer( QgsVectorLayer *layer, int x, int y )
{
if ( !layer )
return false;
QMap< QString, QString > attributes, derivedAttributes;
QgsPoint point = mCanvas->getCoordinateTransform()->toMapCoordinates( x, y );
derivedAttributes.insert( tr( "(clicked coordinate)" ), point.toString() );
// load identify radius from settings
QSettings settings;
double identifyValue = settings.value( "/Map/identifyRadius", QGis::DEFAULT_IDENTIFY_RADIUS ).toDouble();
QString ellipsoid = settings.value( "/qgis/measure/ellipsoid", "WGS84" ).toString();
if ( identifyValue <= 0.0 )
identifyValue = QGis::DEFAULT_IDENTIFY_RADIUS;
int featureCount = 0;
QgsFeatureList featureList;
// toLayerCoordinates will throw an exception for an 'invalid' point.
// For example, if you project a world map onto a globe using EPSG 2163
// and then click somewhere off the globe, an exception will be thrown.
try
{
// create the search rectangle
double searchRadius = mCanvas->extent().width() * ( identifyValue / 100.0 );
QgsRectangle r;
r.setXMinimum( point.x() - searchRadius );
r.setXMaximum( point.x() + searchRadius );
r.setYMinimum( point.y() - searchRadius );
r.setYMaximum( point.y() + searchRadius );
r = toLayerCoordinates( layer, r );
layer->select( layer->pendingAllAttributesList(), r, true, true );
QgsFeature f;
while ( layer->nextFeature( f ) )
featureList << QgsFeature( f );
}
catch ( QgsCsException & cse )
{
Q_UNUSED( cse );
// catch exception for 'invalid' point and proceed with no features found
QgsDebugMsg( QString( "Caught CRS exception %1" ).arg( cse.what() ) );
}
// init distance/area calculator
QgsDistanceArea calc;
if ( !featureList.count() == 0 )
{
calc.setProjectionsEnabled( mCanvas->hasCrsTransformEnabled() ); // project?
calc.setEllipsoid( ellipsoid );
calc.setSourceCrs( layer->crs().srsid() );
}
QgsFeatureList::iterator f_it = featureList.begin();
for ( ; f_it != featureList.end(); ++f_it )
{
featureCount++;
QgsFeatureId fid = f_it->id();
QMap<QString, QString> derivedAttributes;
// Calculate derived attributes and insert:
// measure distance or area depending on geometry type
if ( layer->geometryType() == QGis::Line )
{
double dist = calc.measure( f_it->geometry() );
QGis::UnitType myDisplayUnits;
convertMeasurement( calc, dist, myDisplayUnits, false );
QString str = calc.textUnit( dist, 3, myDisplayUnits, false ); // dist and myDisplayUnits are out params
derivedAttributes.insert( tr( "Length" ), str );
if ( f_it->geometry()->wkbType() == QGis::WKBLineString ||
f_it->geometry()->wkbType() == QGis::WKBLineString25D )
{
// Add the start and end points in as derived attributes
str = QLocale::system().toString( f_it->geometry()->asPolyline().first().x(), 'g', 10 );
derivedAttributes.insert( tr( "firstX", "attributes get sorted; translation for lastX should be lexically larger than this one" ), str );
str = QLocale::system().toString( f_it->geometry()->asPolyline().first().y(), 'g', 10 );
derivedAttributes.insert( tr( "firstY" ), str );
str = QLocale::system().toString( f_it->geometry()->asPolyline().last().x(), 'g', 10 );
derivedAttributes.insert( tr( "lastX", "attributes get sorted; translation for firstX should be lexically smaller than this one" ), str );
str = QLocale::system().toString( f_it->geometry()->asPolyline().last().y(), 'g', 10 );
derivedAttributes.insert( tr( "lastY" ), str );
}
}
else if ( layer->geometryType() == QGis::Polygon )
{
double area = calc.measure( f_it->geometry() );
QGis::UnitType myDisplayUnits;
convertMeasurement( calc, area, myDisplayUnits, true ); // area and myDisplayUnits are out params
QString str = calc.textUnit( area, 3, myDisplayUnits, true );
derivedAttributes.insert( tr( "Area" ), str );
}
else if ( layer->geometryType() == QGis::Point &&
( f_it->geometry()->wkbType() == QGis::WKBPoint ||
f_it->geometry()->wkbType() == QGis::WKBPoint25D ) )
{
// Include the x and y coordinates of the point as a derived attribute
QString str;
str = QLocale::system().toString( f_it->geometry()->asPoint().x(), 'g', 10 );
derivedAttributes.insert( "X", str );
str = QLocale::system().toString( f_it->geometry()->asPoint().y(), 'g', 10 );
derivedAttributes.insert( "Y", str );
}
derivedAttributes.insert( tr( "feature id" ), fid < 0 ? tr( "new feature" ) : FID_TO_STRING( fid ) );
results()->addFeature( layer, *f_it, derivedAttributes );
}
QgsDebugMsg( "Feature count on identify: " + QString::number( featureCount ) );
return featureCount > 0;
}