void QgsProjectionSelectionTreeWidget::updateBoundsPreview()
{
QTreeWidgetItem *lvi = lstCoordinateSystems->currentItem();
if ( !lvi || lvi->text( QgisCrsIdColumn ).isEmpty() )
return;
QgsCoordinateReferenceSystem currentCrs = crs();
if ( !currentCrs.isValid() )
return;
QgsRectangle rect = currentCrs.bounds();
if ( !qgsDoubleNear( rect.area(), 0.0 ) )
{
QgsGeometry geom;
if ( rect.xMinimum() > rect.xMaximum() )
{
QgsRectangle rect1 = QgsRectangle( -180, rect.yMinimum(), rect.xMaximum(), rect.yMaximum() );
QgsRectangle rect2 = QgsRectangle( rect.xMinimum(), rect.yMinimum(), 180, rect.yMaximum() );
geom = QgsGeometry::fromRect( rect1 );
geom.addPart( QgsGeometry::fromRect( rect2 ) );
}
else
{
geom = QgsGeometry::fromRect( rect );
}
mPreviewBand->setToGeometry( geom, nullptr );
mPreviewBand->setColor( QColor( 255, 0, 0, 65 ) );
QgsRectangle extent = geom.boundingBox();
extent.scale( 1.1 );
mAreaCanvas->setExtent( extent );
mAreaCanvas->refresh();
mPreviewBand->show();
QString extentString = tr( "Extent: %1, %2, %3, %4" )
.arg( rect.xMinimum(), 0, 'f', 2 )
.arg( rect.yMinimum(), 0, 'f', 2 )
.arg( rect.xMaximum(), 0, 'f', 2 )
.arg( rect.yMaximum(), 0, 'f', 2 );
QString proj4String = tr( "Proj4: %1" ).arg( selectedProj4String() );
teProjection->setText( extentString + "\n" + proj4String );
}
else
{
mPreviewBand->hide();
mAreaCanvas->zoomToFullExtent();
QString extentString = tr( "Extent: Extent not known" );
QString proj4String = tr( "Proj4: %1" ).arg( selectedProj4String() );
teProjection->setText( extentString + "\n" + proj4String );
}
}
