QgsGeometry *QgsRubberBand::asGeometry()
{
QgsGeometry *geom = NULL;
switch ( mGeometryType )
{
case QGis::Polygon:
{
QgsPolygon polygon;
QList< QList<QgsPoint> >::const_iterator it = mPoints.constBegin();
for ( ; it != mPoints.constEnd(); ++it )
{
polygon.append( getPolyline( *it ) );
}
geom = QgsGeometry::fromPolygon( polygon );
break;
}
case QGis::Point:
{
QgsMultiPoint multiPoint;
QList< QList<QgsPoint> >::const_iterator it = mPoints.constBegin();
for ( ; it != mPoints.constEnd(); ++it )
{
multiPoint += getPolyline( *it );
}
geom = QgsGeometry::fromMultiPoint( multiPoint );
break;
}
case QGis::Line:
default:
{
if ( mPoints.size() > 0 )
{
if ( mPoints.size() > 1 )
{
QgsMultiPolyline multiPolyline;
QList< QList<QgsPoint> >::const_iterator it = mPoints.constBegin();
for ( ; it != mPoints.constEnd(); ++it )
{
multiPolyline.append( getPolyline( *it ) );
}
geom = QgsGeometry::fromMultiPolyline( multiPolyline );
}
else
{
geom = QgsGeometry::fromPolyline( getPolyline( mPoints[0] ) );
}
}
break;
}
}
return geom;
}
QgsAbstractGeometryV2* QgsGeometryImport::fromRect( const QgsRectangle& rect )
{
QgsPolyline ring;
ring.append( QgsPoint( rect.xMinimum(), rect.yMinimum() ) );
ring.append( QgsPoint( rect.xMaximum(), rect.yMinimum() ) );
ring.append( QgsPoint( rect.xMaximum(), rect.yMaximum() ) );
ring.append( QgsPoint( rect.xMinimum(), rect.yMaximum() ) );
ring.append( QgsPoint( rect.xMinimum(), rect.yMinimum() ) );
QgsPolygon polygon;
polygon.append( ring );
return fromPolygon( polygon );
}
double QgsGrassGisLib::G_area_of_polygon( const double *x, const double *y, int n )
{
QgsPolyline polyline;
for ( int i = 0; i < n; i++ )
{
polyline.append( QgsPoint( x[i], y[i] ) );
}
QgsPolygon polygon;
polygon.append( polyline );
QgsGeometry* geo = QgsGeometry::fromPolygon( polygon );
double area = mDistanceArea.measure( geo );
delete geo;
if ( !mCrs.geographicFlag() )
{
area *= qPow( G_database_units_to_meters_factor(), 2 );
}
return area;
}