void QgsMapToolSimplify::canvasPressEvent( QMouseEvent * e )
{
QgsVectorLayer * vlayer = currentVectorLayer();
QgsPoint layerCoords = mCanvas->getCoordinateTransform()->toMapPoint( e->pos().x(), e->pos().y() );
double r = QgsTolerance::vertexSearchRadius( vlayer, mCanvas->mapRenderer() );
QgsRectangle selectRect = QgsRectangle( layerCoords.x() - r, layerCoords.y() - r,
layerCoords.x() + r, layerCoords.y() + r );
vlayer->select( QgsAttributeList(), selectRect, true );
QgsGeometry* geometry = QgsGeometry::fromPoint( layerCoords );
double minDistance = DBL_MAX;
double currentDistance;
QgsFeature f;
mSelectedFeature.setValid( false );
while ( vlayer->nextFeature( f ) )
{
currentDistance = geometry->distance( *( f.geometry() ) );
if ( currentDistance < minDistance )
{
minDistance = currentDistance;
mSelectedFeature = f;
}
}
// delete previous rubberband (if any)
removeRubberBand();
if ( mSelectedFeature.isValid() )
{
if ( mSelectedFeature.geometry()->isMultipart() )
{
QMessageBox::critical( 0, tr( "Unsupported operation" ), tr( "Multipart features are not supported for simplification." ) );
return;
}
mRubberBand = new QgsRubberBand( mCanvas );
mRubberBand->setToGeometry( mSelectedFeature.geometry(), 0 );
mRubberBand->setColor( Qt::red );
mRubberBand->setWidth( 2 );
mRubberBand->show();
//calculate boudaries for slidebar
if ( calculateSliderBoudaries() )
{
// show dialog as a non-modal window
mSimplifyDialog->show();
}
else
{
QMessageBox::warning( 0, tr( "Unsupported operation" ), tr( "This feature cannot be simplified. Check if feature has enough vertices to be simplified." ) );
}
}
}
void QgsMapToolSimplify::canvasPressEvent( QMouseEvent * e )
{
QgsVectorLayer * vlayer = currentVectorLayer();
if ( !vlayer )
{
notifyNotVectorLayer();
return;
}
QgsPoint layerCoords = mCanvas->getCoordinateTransform()->toMapPoint( e->pos().x(), e->pos().y() );
double r = QgsTolerance::vertexSearchRadius( vlayer, mCanvas->mapSettings() );
QgsRectangle selectRect = QgsRectangle( layerCoords.x() - r, layerCoords.y() - r,
layerCoords.x() + r, layerCoords.y() + r );
QgsFeatureIterator fit = vlayer->getFeatures( QgsFeatureRequest().setFilterRect( selectRect ).setSubsetOfAttributes( QgsAttributeList() ) );
QgsGeometry* geometry = QgsGeometry::fromPoint( layerCoords );
double minDistance = DBL_MAX;
double currentDistance;
mSelectedFeature.setValid( false );
QgsFeature f;
while ( fit.nextFeature( f ) )
{
currentDistance = geometry->distance( *( f.geometry() ) );
if ( currentDistance < minDistance )
{
minDistance = currentDistance;
mSelectedFeature = f;
}
}
// delete previous rubberband (if any)
removeRubberBand();
if ( mSelectedFeature.isValid() )
{
if ( mSelectedFeature.geometry()->isMultipart() )
{
emit messageEmitted( tr( "Multipart features are not supported for simplification." ), QgsMessageBar::CRITICAL );
return;
}
mRubberBand = new QgsRubberBand( mCanvas );
mRubberBand->setToGeometry( mSelectedFeature.geometry(), 0 );
mRubberBand->setColor( QColor( 255, 0, 0, 65 ) );
mRubberBand->setWidth( 2 );
mRubberBand->show();
//calculate boudaries for slidebar
if ( calculateSliderBoudaries() )
{
// show dialog as a non-modal window
mSimplifyDialog->show();
}
else
{
emit messageEmitted( tr( "This feature cannot be simplified. Check if feature has enough vertices to be simplified." ), QgsMessageBar::WARNING );
}
}
}
