void TVPlot::setMode( int mode )
{
QwtPlotItemList items = itemList( QwtPlotItem::Rtti_PlotHistogram );
for ( int i = 0; i < items.size(); i++ )
{
QwtPlotHistogram *histogram = static_cast<QwtPlotHistogram *>( items[i] );
if ( mode < 3 )
{
histogram->setStyle( static_cast<QwtPlotHistogram::HistogramStyle>( mode ) );
histogram->setSymbol( NULL );
QPen pen( Qt::black, 0 );
if ( mode == QwtPlotHistogram::Lines )
pen.setBrush( histogram->brush() );
histogram->setPen( pen );
}
else
{
histogram->setStyle( QwtPlotHistogram::Columns );
QwtColumnSymbol *symbol = new QwtColumnSymbol( QwtColumnSymbol::Box );
symbol->setFrameStyle( QwtColumnSymbol::Raised );
symbol->setLineWidth( 2 );
symbol->setPalette( QPalette( histogram->brush().color() ) );
histogram->setSymbol( symbol );
}
}
}
void QgsHistogramWidget::drawHistogram()
{
// clear plot
mpPlot->detachItems();
//ensure all children get removed
mpPlot->setAutoDelete( true );
// Set axis titles
if ( !mXAxisTitle.isEmpty() )
mpPlot->setAxisTitle( QwtPlot::xBottom, mXAxisTitle );
if ( !mYAxisTitle.isEmpty() )
mpPlot->setAxisTitle( QwtPlot::yLeft, mYAxisTitle );
mpPlot->setAxisFont( QwtPlot::xBottom, this->font() );
mpPlot->setAxisFont( QwtPlot::yLeft, this->font() );
QFont titleFont = this->font();
titleFont.setBold( true );
QwtText xAxisText = mpPlot->axisTitle( QwtPlot::xBottom );
xAxisText.setFont( titleFont );
mpPlot->setAxisTitle( QwtPlot::xBottom, xAxisText );
QwtText yAxisText = mpPlot->axisTitle( QwtPlot::yLeft );
yAxisText.setFont( titleFont );
mpPlot->setAxisTitle( QwtPlot::yLeft, yAxisText );
mpPlot->setAxisAutoScale( QwtPlot::yLeft );
mpPlot->setAxisAutoScale( QwtPlot::xBottom );
// add a grid
QwtPlotGrid *grid = new QwtPlotGrid();
grid->enableX( false );
grid->setPen( mGridPen );
grid->attach( mpPlot );
// make colors list
mHistoColors.clear();
Q_FOREACH ( const QgsRendererRange &range, mRanges )
{
mHistoColors << ( range.symbol() ? range.symbol()->color() : Qt::black );
}
//draw histogram
QwtPlotHistogram *plotHistogram = nullptr;
plotHistogram = createPlotHistogram( !mRanges.isEmpty() ? mRanges.at( 0 ).label() : QString(),
!mRanges.isEmpty() ? QBrush( mHistoColors.at( 0 ) ) : mBrush,
!mRanges.isEmpty() ? Qt::NoPen : mPen );
QVector<QwtIntervalSample> dataHisto;
int bins = mBinsSpinBox->value();
QList<double> edges = mHistogram.binEdges( bins );
QList<int> counts = mHistogram.counts( bins );
int rangeIndex = 0;
int lastValue = 0;
for ( int bin = 0; bin < bins; ++bin )
{
int binValue = counts.at( bin );
//current bin crosses two graduated ranges, so we split between
//two histogram items
if ( rangeIndex < mRanges.count() - 1 && edges.at( bin ) > mRanges.at( rangeIndex ).upperValue() )
{
rangeIndex++;
plotHistogram->setSamples( dataHisto );
plotHistogram->attach( mpPlot );
plotHistogram = createPlotHistogram( mRanges.at( rangeIndex ).label(), mHistoColors.at( rangeIndex ) );
dataHisto.clear();
dataHisto << QwtIntervalSample( lastValue, mRanges.at( rangeIndex - 1 ).upperValue(), edges.at( bin ) );
}
double upperEdge = !mRanges.isEmpty() ? qMin( edges.at( bin + 1 ), mRanges.at( rangeIndex ).upperValue() )
: edges.at( bin + 1 );
dataHisto << QwtIntervalSample( binValue, edges.at( bin ), upperEdge );
lastValue = binValue;
}
plotHistogram->setSamples( dataHisto );
plotHistogram->attach( mpPlot );
mRangeMarkers.clear();
Q_FOREACH ( const QgsRendererRange &range, mRanges )
{
QwtPlotMarker *rangeMarker = new QwtPlotMarker();
rangeMarker->attach( mpPlot );
rangeMarker->setLineStyle( QwtPlotMarker::VLine );
rangeMarker->setXValue( range.upperValue() );
rangeMarker->setLabel( QString::number( range.upperValue() ) );
rangeMarker->setLabelOrientation( Qt::Vertical );
rangeMarker->setLabelAlignment( Qt::AlignLeft | Qt::AlignTop );
rangeMarker->show();
mRangeMarkers << rangeMarker;
}
void QgsHistogramWidget::drawHistogram()
{
if ( !mVectorLayer || mSourceFieldExp.isEmpty() )
return;
QApplication::setOverrideCursor( Qt::WaitCursor );
if ( mValues.empty() )
{
bool ok;
mValues = mVectorLayer->getDoubleValues( mSourceFieldExp, ok );
if ( ! ok )
{
QApplication::restoreOverrideCursor();
return;
}
qSort( mValues.begin(), mValues.end() );
mHistogram.setValues( mValues );
mBinsSpinBox->blockSignals( true );
mBinsSpinBox->setValue( qMax( mHistogram.optimalNumberBins(), 30 ) );
mBinsSpinBox->blockSignals( false );
mStats.setStatistics( QgsStatisticalSummary::StDev );
mStats.calculate( mValues );
}
// clear plot
mpPlot->detachItems();
//ensure all children get removed
mpPlot->setAutoDelete( true );
// Set axis titles
mpPlot->setAxisTitle( QwtPlot::xBottom, QObject::tr( "Value" ) );
mpPlot->setAxisTitle( QwtPlot::yLeft, QObject::tr( "Count" ) );
mpPlot->setAxisAutoScale( QwtPlot::yLeft );
mpPlot->setAxisAutoScale( QwtPlot::xBottom );
// add a grid
QwtPlotGrid * grid = new QwtPlotGrid();
grid->enableX( false );
grid->setPen( mGridPen );
grid->attach( mpPlot );
// make colors list
mHistoColors.clear();
foreach ( QgsRendererRangeV2 range, mRanges )
{
mHistoColors << ( range.symbol() ? range.symbol()->color() : Qt::black );
}
//draw histogram
#if defined(QWT_VERSION) && QWT_VERSION>=0x060000
QwtPlotHistogram * plotHistogram = 0;
plotHistogram = createPlotHistogram( mRanges.count() > 0 ? mRanges.at( 0 ).label() : QString(),
mRanges.count() > 0 ? QBrush( mHistoColors.at( 0 ) ) : mBrush,
mRanges.count() > 0 ? Qt::NoPen : mPen );
#else
HistogramItem *plotHistogramItem = 0;
plotHistogramItem = createHistoItem( mRanges.count() > 0 ? mRanges.at( 0 ).label() : QString(),
mRanges.count() > 0 ? QBrush( mHistoColors.at( 0 ) ) : mBrush,
mRanges.count() > 0 ? Qt::NoPen : mPen );
#endif
#if defined(QWT_VERSION) && QWT_VERSION>=0x060000
QVector<QwtIntervalSample> dataHisto;
#else
// we safely assume that QT>=4.0 (min version is 4.7), therefore QwtArray is a QVector, so don't set size here
QwtArray<QwtDoubleInterval> intervalsHisto;
QwtArray<double> valuesHisto;
#endif
int bins = mBinsSpinBox->value();
QList<double> edges = mHistogram.binEdges( bins );
QList<int> counts = mHistogram.counts( bins );
int rangeIndex = 0;
int lastValue = 0;
for ( int bin = 0; bin < bins; ++bin )
{
int binValue = counts.at( bin );
//current bin crosses two graduated ranges, so we split between
//two histogram items
if ( rangeIndex < mRanges.count() - 1 && edges.at( bin ) > mRanges.at( rangeIndex ).upperValue() )
{
rangeIndex++;
#if defined(QWT_VERSION) && QWT_VERSION>=0x060000
plotHistogram->setSamples( dataHisto );
plotHistogram->attach( mpPlot );
plotHistogram = createPlotHistogram( mRanges.at( rangeIndex ).label(), mHistoColors.at( rangeIndex ) );
dataHisto.clear();
dataHisto << QwtIntervalSample( lastValue, mRanges.at( rangeIndex - 1 ).upperValue(), edges.at( bin ) );
#else
plotHistogramItem->setData( QwtIntervalData( intervalsHisto, valuesHisto ) );
plotHistogramItem->attach( mpPlot );
plotHistogramItem = createHistoItem( mRanges.at( rangeIndex ).label(), mHistoColors.at( rangeIndex ) );
intervalsHisto.clear();
valuesHisto.clear();
intervalsHisto.append( QwtDoubleInterval( mRanges.at( rangeIndex - 1 ).upperValue(), edges.at( bin ) ) );
valuesHisto.append( lastValue );
#endif
}
double upperEdge = mRanges.count() > 0 ? qMin( edges.at( bin + 1 ), mRanges.at( rangeIndex ).upperValue() )
: edges.at( bin + 1 );
#if defined(QWT_VERSION) && QWT_VERSION>=0x060000
dataHisto << QwtIntervalSample( binValue, edges.at( bin ), upperEdge );
#else
intervalsHisto.append( QwtDoubleInterval( edges.at( bin ), upperEdge ) );
valuesHisto.append( double( binValue ) );
#endif
lastValue = binValue;
}
#if defined(QWT_VERSION) && QWT_VERSION>=0x060000
plotHistogram->setSamples( dataHisto );
plotHistogram->attach( mpPlot );
#else
plotHistogramItem->setData( QwtIntervalData( intervalsHisto, valuesHisto ) );
plotHistogramItem->attach( mpPlot );
#endif
mRangeMarkers.clear();
foreach ( QgsRendererRangeV2 range, mRanges )
{
QwtPlotMarker* rangeMarker = new QwtPlotMarker();
rangeMarker->attach( mpPlot );
rangeMarker->setLineStyle( QwtPlotMarker::VLine );
rangeMarker->setXValue( range.upperValue() );
rangeMarker->setLabel( QString::number( range.upperValue() ) );
rangeMarker->setLabelOrientation( Qt::Vertical );
rangeMarker->setLabelAlignment( Qt::AlignLeft | Qt::AlignTop );
rangeMarker->show();
mRangeMarkers << rangeMarker;
}
