void TestQgsDistanceArea::collections()
{
//test measuring for collections
QgsDistanceArea myDa;
myDa.setSourceAuthId( "EPSG:4030" );
myDa.setEllipsoidalMode( true );
myDa.setEllipsoid( "WGS84" );
//collection of lines, should be sum of line length
QgsGeometry lines( QgsGeometryFactory::geomFromWkt( "GeometryCollection( LineString(0 36.53, 5.76 -48.16), LineString(0 25.54, 24.20 36.70) )" ) );
double result = myDa.measureLength( &lines );
QGSCOMPARENEAR( result, 12006159, 1 );
result = myDa.measureArea( &lines );
QVERIFY( qgsDoubleNear( result, 0 ) );
//collection of polygons
QgsGeometry polys( QgsGeometryFactory::geomFromWkt( "GeometryCollection( Polygon((0 36.53, 5.76 -48.16, 0 25.54, 0 36.53)), Polygon((10 20, 15 20, 15 10, 10 20)) )" ) );
result = myDa.measureArea( &polys );
QGSCOMPARENEAR( result, 670434859475LL, 1 );
result = myDa.measureLength( &polys );
QVERIFY( qgsDoubleNear( result, 0 ) );
//mixed collection
QgsGeometry mixed( QgsGeometryFactory::geomFromWkt( "GeometryCollection( LineString(0 36.53, 5.76 -48.16), LineString(0 25.54, 24.20 36.70), Polygon((0 36.53, 5.76 -48.16, 0 25.54, 0 36.53)), Polygon((10 20, 15 20, 15 10, 10 20)) )" ) );
//measure area specifically
result = myDa.measureArea( &mixed );
QGSCOMPARENEAR( result, 670434859475LL, 1 );
//measure length
result = myDa.measureLength( &mixed );
QGSCOMPARENEAR( result, 12006159, 1 );
}
void TestQgsDistanceArea::regression13601()
{
//test regression #13601
QgsDistanceArea calc;
calc.setEllipsoidalMode( true );
calc.setEllipsoid( "NONE" );
calc.setSourceCrs( 1108L );
QgsGeometry geom( QgsGeometryFactory::geomFromWkt( "Polygon ((252000 1389000, 265000 1389000, 265000 1385000, 252000 1385000, 252000 1389000))" ) );
QVERIFY( qgsDoubleNear( calc.measureArea( &geom ), 52000000, 0.0001 ) );
}
void TestQgsDistanceArea::regression14675()
{
//test regression #14675
QgsDistanceArea calc;
calc.setEllipsoidalMode( true );
calc.setEllipsoid( "GRS80" );
calc.setSourceCrs( 145L );
QgsGeometry geom( QgsGeometryFactory::geomFromWkt( "Polygon ((917593.5791854317067191 6833700.00807378999888897, 917596.43389983859378844 6833700.67099479306489229, 917599.53056440979707986 6833700.78673478215932846, 917593.5791854317067191 6833700.00807378999888897))" ) );
//lots of tolerance here - the formulas get quite unstable with small areas due to division by very small floats
QGSCOMPARENEAR( calc.measureArea( &geom ), 0.83301, 0.02 );
}
QList<double> QgsGeometryAnalyzer::simpleMeasure( QgsGeometry& mpGeometry )
{
QList<double> list;
double perim;
if ( mpGeometry.wkbType() == QgsWkbTypes::Point )
{
QgsPoint pt = mpGeometry.asPoint();
list.append( pt.x() );
list.append( pt.y() );
}
else
{
QgsDistanceArea measure;
list.append( measure.measureArea( mpGeometry ) );
if ( mpGeometry.type() == QgsWkbTypes::PolygonGeometry )
{
perim = perimeterMeasure( mpGeometry, measure );
list.append( perim );
}
}
return list;
}
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;
}
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()->ellipsoid();
QgsDistanceArea calc;
calc.setEllipsoidalMode( mCanvas->hasCrsTransformEnabled() );
calc.setEllipsoid( ellipsoid );
calc.setSourceCrs( layer->crs().srsid() );
QgsWkbTypes::Type wkbType = QgsWkbTypes::NoGeometry;
QgsWkbTypes::GeometryType geometryType = QgsWkbTypes::NullGeometry;
QgsVertexId vId;
QgsPointV2 closestPoint;
if ( feature->hasGeometry() )
{
geometryType = feature->geometry().type();
wkbType = feature->geometry().geometry()->wkbType();
//find closest vertex to clicked point
closestPoint = QgsGeometryUtils::closestVertex( *feature->geometry().geometry(), QgsPointV2( layerPoint.x(), layerPoint.y() ), vId );
}
if ( QgsWkbTypes::isMultiType( wkbType ) )
{
QString str = QLocale::system().toString( static_cast<const QgsGeometryCollection*>( feature->geometry().geometry() )->numGeometries() );
derivedAttributes.insert( tr( "Parts" ), str );
str = QLocale::system().toString( vId.part + 1 );
derivedAttributes.insert( tr( "Part number" ), str );
}
if ( geometryType == QgsWkbTypes::LineGeometry )
{
double dist = calc.measureLength( feature->geometry() );
dist = calc.convertLengthMeasurement( dist, displayDistanceUnits() );
QString str = formatDistance( dist );
derivedAttributes.insert( tr( "Length" ), str );
const QgsCurve* curve = dynamic_cast< const QgsCurve* >( feature->geometry().geometry() );
if ( curve )
{
str = QLocale::system().toString( curve->nCoordinates() );
derivedAttributes.insert( tr( "Vertices" ), str );
//add details of closest vertex to identify point
closestVertexAttributes( *curve, vId, layer, derivedAttributes );
// Add the start and end points in as derived attributes
QgsPoint pnt = mCanvas->mapSettings().layerToMapCoordinates( layer, QgsPoint( curve->startPoint().x(), curve->startPoint().y() ) );
str = formatXCoordinate( pnt );
derivedAttributes.insert( tr( "firstX", "attributes get sorted; translation for lastX should be lexically larger than this one" ), str );
str = formatYCoordinate( pnt );
derivedAttributes.insert( tr( "firstY" ), str );
pnt = mCanvas->mapSettings().layerToMapCoordinates( layer, QgsPoint( curve->endPoint().x(), curve->endPoint().y() ) );
str = formatXCoordinate( pnt );
derivedAttributes.insert( tr( "lastX", "attributes get sorted; translation for firstX should be lexically smaller than this one" ), str );
str = formatYCoordinate( pnt );
derivedAttributes.insert( tr( "lastY" ), str );
}
}
else if ( geometryType == QgsWkbTypes::PolygonGeometry )
{
double area = calc.measureArea( feature->geometry() );
area = calc.convertAreaMeasurement( area, displayAreaUnits() );
QString str = formatArea( area );
derivedAttributes.insert( tr( "Area" ), str );
double perimeter = calc.measurePerimeter( feature->geometry() );
perimeter = calc.convertLengthMeasurement( perimeter, displayDistanceUnits() );
str = formatDistance( perimeter );
derivedAttributes.insert( tr( "Perimeter" ), str );
str = QLocale::system().toString( feature->geometry().geometry()->nCoordinates() );
derivedAttributes.insert( tr( "Vertices" ), str );
//add details of closest vertex to identify point
closestVertexAttributes( *feature->geometry().geometry(), vId, layer, derivedAttributes );
}
else if ( geometryType == QgsWkbTypes::PointGeometry &&
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->geometry().asPoint() );
QString str = formatXCoordinate( pnt );
derivedAttributes.insert( "X", str );
str = formatYCoordinate( pnt );
derivedAttributes.insert( "Y", str );
if ( QgsWkbTypes::hasZ( wkbType ) )
{
str = QLocale::system().toString( static_cast<const QgsPointV2*>( feature->geometry().geometry() )->z(), 'g', 10 );
derivedAttributes.insert( "Z", str );
}
if ( QgsWkbTypes::hasM( wkbType ) )
{
str = QLocale::system().toString( static_cast<const QgsPointV2*>( feature->geometry().geometry() )->m(), 'g', 10 );
derivedAttributes.insert( "M", str );
}
}
return derivedAttributes;
}
void TestQgsDistanceArea::measureAreaAndUnits()
{
QgsDistanceArea da;
da.setSourceCrs( 3452 );
da.setEllipsoidalMode( false );
da.setEllipsoid( "NONE" );
QgsCoordinateReferenceSystem daCRS;
daCRS.createFromSrsId( da.sourceCrsId() );
QgsPolyline ring;
ring << QgsPoint( 0, 0 )
<< QgsPoint( 1, 0 )
<< QgsPoint( 1, 1 )
<< QgsPoint( 2, 1 )
<< QgsPoint( 2, 2 )
<< QgsPoint( 0, 2 )
<< QgsPoint( 0, 0 );
QgsPolygon poly;
poly << ring;
QgsGeometry polygon( QgsGeometry::fromPolygon( poly ) );
// We check both the measured area AND the units, in case the logic regarding
// ellipsoids and units changes in future
double area = da.measureArea( &polygon );
QgsUnitTypes::AreaUnit units = da.areaUnits();
QgsDebugMsg( QString( "measured %1 in %2" ).arg( area ).arg( QgsUnitTypes::toString( units ) ) );
QVERIFY(( qgsDoubleNear( area, 3.0, 0.00000001 ) && units == QgsUnitTypes::AreaSquareDegrees )
|| ( qgsDoubleNear( area, 37176087091.5, 0.1 ) && units == QgsUnitTypes::AreaSquareMeters ) );
da.setEllipsoid( "WGS84" );
area = da.measureArea( &polygon );
units = da.areaUnits();
QgsDebugMsg( QString( "measured %1 in %2" ).arg( area ).arg( QgsUnitTypes::toString( units ) ) );
QVERIFY(( qgsDoubleNear( area, 3.0, 0.00000001 ) && units == QgsUnitTypes::AreaSquareDegrees )
|| ( qgsDoubleNear( area, 37176087091.5, 0.1 ) && units == QgsUnitTypes::AreaSquareMeters ) );
da.setEllipsoidalMode( true );
area = da.measureArea( &polygon );
units = da.areaUnits();
QgsDebugMsg( QString( "measured %1 in %2" ).arg( area ).arg( QgsUnitTypes::toString( units ) ) );
// should always be in Meters Squared
QGSCOMPARENEAR( area, 37416879192.9, 0.1 );
QCOMPARE( units, QgsUnitTypes::AreaSquareMeters );
// test converting the resultant area
area = da.convertAreaMeasurement( area, QgsUnitTypes::AreaSquareMiles );
QGSCOMPARENEAR( area, 14446.7378, 0.001 );
// now try with a source CRS which is in feet
ring.clear();
ring << QgsPoint( 1850000, 4423000 )
<< QgsPoint( 1851000, 4423000 )
<< QgsPoint( 1851000, 4424000 )
<< QgsPoint( 1852000, 4424000 )
<< QgsPoint( 1852000, 4425000 )
<< QgsPoint( 1851000, 4425000 )
<< QgsPoint( 1850000, 4423000 );
poly.clear();
poly << ring;
polygon = QgsGeometry::fromPolygon( poly );
da.setSourceCrs( 27469 );
da.setEllipsoidalMode( false );
// measurement should be in square feet
area = da.measureArea( &polygon );
units = da.areaUnits();
QgsDebugMsg( QString( "measured %1 in %2" ).arg( area ).arg( QgsUnitTypes::toString( units ) ) );
QGSCOMPARENEAR( area, 2000000, 0.001 );
QCOMPARE( units, QgsUnitTypes::AreaSquareFeet );
// test converting the resultant area
area = da.convertAreaMeasurement( area, QgsUnitTypes::AreaSquareYards );
QGSCOMPARENEAR( area, 222222.2222, 0.001 );
da.setEllipsoidalMode( true );
// now should be in Square Meters again
area = da.measureArea( &polygon );
units = da.areaUnits();
QgsDebugMsg( QString( "measured %1 in %2" ).arg( area ).arg( QgsUnitTypes::toString( units ) ) );
QGSCOMPARENEAR( area, 184149.37, 1.0 );
QCOMPARE( units, QgsUnitTypes::AreaSquareMeters );
// test converting the resultant area
area = da.convertAreaMeasurement( area, QgsUnitTypes::AreaSquareYards );
QgsDebugMsg( QString( "measured %1 in sq yrds" ).arg( area ) );
QGSCOMPARENEAR( area, 220240.8172549, 0.00001 );
}