void QgsGraduatedSymbolRendererV2Widget::classifyGraduated()
{
QString attrName = mExpressionWidget->currentField();
int classes = spinGraduatedClasses->value();
QgsVectorColorRampV2* ramp = cboGraduatedColorRamp->currentColorRamp();
if ( ramp == NULL )
{
if ( cboGraduatedColorRamp->count() == 0 )
QMessageBox::critical( this, tr( "Error" ), tr( "There are no available color ramps. You can add them in Style Manager." ) );
else
QMessageBox::critical( this, tr( "Error" ), tr( "The selected color ramp is not available." ) );
return;
}
QgsGraduatedSymbolRendererV2::Mode mode;
if ( cboGraduatedMode->currentIndex() == 0 )
mode = QgsGraduatedSymbolRendererV2::EqualInterval;
else if ( cboGraduatedMode->currentIndex() == 2 )
mode = QgsGraduatedSymbolRendererV2::Jenks;
else if ( cboGraduatedMode->currentIndex() == 3 )
mode = QgsGraduatedSymbolRendererV2::StdDev;
else if ( cboGraduatedMode->currentIndex() == 4 )
mode = QgsGraduatedSymbolRendererV2::Pretty;
else // default should be quantile for now
mode = QgsGraduatedSymbolRendererV2::Quantile;
// Jenks is n^2 complexity, warn for big dataset (more than 50k records)
// and give the user the chance to cancel
if ( QgsGraduatedSymbolRendererV2::Jenks == mode
&& mLayer->featureCount() > 50000 )
{
if ( QMessageBox::Cancel == QMessageBox::question( this, tr( "Warning" ), tr( "Natural break classification (Jenks) is O(n2) complexity, your classification may take a long time.\nPress cancel to abort breaks calculation or OK to continue." ), QMessageBox::Cancel, QMessageBox::Ok ) ) return;
}
// create and set new renderer
QApplication::setOverrideCursor( Qt::WaitCursor );
QgsGraduatedSymbolRendererV2* r = QgsGraduatedSymbolRendererV2::createRenderer(
mLayer, attrName, classes, mode, mGraduatedSymbol, ramp, cbxInvertedColorRamp->isChecked() );
QApplication::restoreOverrideCursor();
if ( !r )
{
QMessageBox::critical( this, tr( "Error" ), tr( "Renderer creation has failed." ) );
return;
}
r->setSizeScaleField( mRenderer->sizeScaleField() );
r->setRotationField( mRenderer->rotationField() );
r->setScaleMethod( mRenderer->scaleMethod() );
if ( mModel )
{
mModel->setRenderer( r );
}
delete mRenderer;
mRenderer = r;
}
QgsFeatureRendererV2* QgsGraduatedSymbolRendererV2::clone()
{
QgsGraduatedSymbolRendererV2* r = new QgsGraduatedSymbolRendererV2( mAttrName, mRanges );
r->setMode( mMode );
if ( mSourceSymbol )
r->setSourceSymbol( mSourceSymbol->clone() );
if ( mSourceColorRamp )
r->setSourceColorRamp( mSourceColorRamp->clone() );
r->setUsingSymbolLevels( usingSymbolLevels() );
r->setRotationField( rotationField() );
r->setSizeScaleField( sizeScaleField() );
return r;
}
void QgsGraduatedSymbolRendererV2Widget::classifyGraduated()
{
QString attrName = cboGraduatedColumn->currentText();
int classes = spinGraduatedClasses->value();
QgsVectorColorRampV2* ramp = cboGraduatedColorRamp->currentColorRamp();
if ( ramp == NULL )
{
if ( cboGraduatedColorRamp->count() == 0 )
QMessageBox::critical( this, tr( "Error" ), tr( "There are no available color ramps. You can add them in Style Manager." ) );
else
QMessageBox::critical( this, tr( "Error" ), tr( "The selected color ramp is not available." ) );
return;
}
QgsGraduatedSymbolRendererV2::Mode mode;
if ( cboGraduatedMode->currentIndex() == 0 )
mode = QgsGraduatedSymbolRendererV2::EqualInterval;
else if ( cboGraduatedMode->currentIndex() == 2 )
mode = QgsGraduatedSymbolRendererV2::Jenks;
else if ( cboGraduatedMode->currentIndex() == 3 )
mode = QgsGraduatedSymbolRendererV2::StdDev;
else if ( cboGraduatedMode->currentIndex() == 4 )
mode = QgsGraduatedSymbolRendererV2::Pretty;
else // default should be quantile for now
mode = QgsGraduatedSymbolRendererV2::Quantile;
// create and set new renderer
QApplication::setOverrideCursor( Qt::WaitCursor );
QgsGraduatedSymbolRendererV2* r = QgsGraduatedSymbolRendererV2::createRenderer(
mLayer, attrName, classes, mode, mGraduatedSymbol, ramp );
QApplication::restoreOverrideCursor();
if ( !r )
{
QMessageBox::critical( this, tr( "Error" ), tr( "Renderer creation has failed." ) );
return;
}
r->setSizeScaleField( mRenderer->sizeScaleField() );
r->setRotationField( mRenderer->rotationField() );
r->setScaleMethod( mRenderer->scaleMethod() );
delete mRenderer;
mRenderer = r;
populateRanges();
}
QgsFeatureRendererV2* QgsGraduatedSymbolRendererV2::clone() const
{
QgsGraduatedSymbolRendererV2* r = new QgsGraduatedSymbolRendererV2( mAttrName, mRanges );
r->setMode( mMode );
if ( mSourceSymbol.data() )
r->setSourceSymbol( mSourceSymbol->clone() );
if ( mSourceColorRamp.data() )
{
r->setSourceColorRamp( mSourceColorRamp->clone() );
r->setInvertedColorRamp( mInvertedColorRamp );
}
r->setUsingSymbolLevels( usingSymbolLevels() );
r->setSizeScaleField( sizeScaleField() );
r->setLabelFormat( labelFormat() );
r->setGraduatedMethod( graduatedMethod() );
copyPaintEffect( r );
return r;
}
QgsFeatureRendererV2* QgsGraduatedSymbolRendererV2::create( QDomElement& element )
{
QDomElement symbolsElem = element.firstChildElement( "symbols" );
if ( symbolsElem.isNull() )
return NULL;
QDomElement rangesElem = element.firstChildElement( "ranges" );
if ( rangesElem.isNull() )
return NULL;
QgsSymbolV2Map symbolMap = QgsSymbolLayerV2Utils::loadSymbols( symbolsElem );
QgsRangeList ranges;
QDomElement rangeElem = rangesElem.firstChildElement();
while ( !rangeElem.isNull() )
{
if ( rangeElem.tagName() == "range" )
{
double lowerValue = rangeElem.attribute( "lower" ).toDouble();
double upperValue = rangeElem.attribute( "upper" ).toDouble();
QString symbolName = rangeElem.attribute( "symbol" );
QString label = rangeElem.attribute( "label" );
if ( symbolMap.contains( symbolName ) )
{
QgsSymbolV2* symbol = symbolMap.take( symbolName );
ranges.append( QgsRendererRangeV2( lowerValue, upperValue, symbol, label ) );
}
}
rangeElem = rangeElem.nextSiblingElement();
}
QString attrName = element.attribute( "attr" );
QgsGraduatedSymbolRendererV2* r = new QgsGraduatedSymbolRendererV2( attrName, ranges );
// delete symbols if there are any more
QgsSymbolLayerV2Utils::clearSymbolMap( symbolMap );
// try to load source symbol (optional)
QDomElement sourceSymbolElem = element.firstChildElement( "source-symbol" );
if ( !sourceSymbolElem.isNull() )
{
QgsSymbolV2Map sourceSymbolMap = QgsSymbolLayerV2Utils::loadSymbols( sourceSymbolElem );
if ( sourceSymbolMap.contains( "0" ) )
{
r->setSourceSymbol( sourceSymbolMap.take( "0" ) );
}
QgsSymbolLayerV2Utils::clearSymbolMap( sourceSymbolMap );
}
// try to load color ramp (optional)
QDomElement sourceColorRampElem = element.firstChildElement( "colorramp" );
if ( !sourceColorRampElem.isNull() && sourceColorRampElem.attribute( "name" ) == "[source]" )
{
r->setSourceColorRamp( QgsSymbolLayerV2Utils::loadColorRamp( sourceColorRampElem ) );
QDomElement invertedColorRampElem = element.firstChildElement( "invertedcolorramp" );
if ( !invertedColorRampElem.isNull() )
r->setInvertedColorRamp( invertedColorRampElem.attribute( "value" ) == "1" );
}
// try to load mode
QDomElement modeElem = element.firstChildElement( "mode" );
if ( !modeElem.isNull() )
{
QString modeString = modeElem.attribute( "name" );
if ( modeString == "equal" )
r->setMode( EqualInterval );
else if ( modeString == "quantile" )
r->setMode( Quantile );
else if ( modeString == "jenks" )
r->setMode( Jenks );
else if ( modeString == "stddev" )
r->setMode( StdDev );
else if ( modeString == "pretty" )
r->setMode( Pretty );
}
QDomElement rotationElem = element.firstChildElement( "rotation" );
if ( !rotationElem.isNull() )
r->setRotationField( rotationElem.attribute( "field" ) );
QDomElement sizeScaleElem = element.firstChildElement( "sizescale" );
if ( !sizeScaleElem.isNull() )
r->setSizeScaleField( sizeScaleElem.attribute( "field" ) );
r->setScaleMethod( QgsSymbolLayerV2Utils::decodeScaleMethod( sizeScaleElem.attribute( "scalemethod" ) ) );
// TODO: symbol levels
return r;
}
