qwt_plot_curve.cpp

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/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
 * Qwt Widget Library
 * Copyright (C) 1997   Josef Wilgen
 * Copyright (C) 2002   Uwe Rathmann
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the Qwt License, Version 1.0
 *****************************************************************************/

#include "qwt_plot_curve.h"
#include "qwt_point_data.h"
#include "qwt_math.h"
#include "qwt_clipper.h"
#include "qwt_painter.h"
#include "qwt_scale_map.h"
#include "qwt_plot.h"
#include "qwt_spline_curve_fitter.h"
#include "qwt_symbol.h"
#include "qwt_point_mapper.h"
#include <qpainter.h>
#include <qpixmap.h>
#include <qalgorithms.h>
#include <qmath.h>

static inline QRectF qwtIntersectedClipRect( const QRectF &rect, QPainter *painter )
{
    QRectF clipRect = rect;
    if ( painter->hasClipping() )
    {
#if QT_VERSION >= 0x040800
        const QRectF r = painter->clipBoundingRect();
#else
        const QRectF r = painter->clipRegion().boundingRect();
#endif
        clipRect &= r;
    }

    return clipRect;
}

static void qwtUpdateLegendIconSize( QwtPlotCurve *curve )
{
    if ( curve->symbol() && 
        curve->testLegendAttribute( QwtPlotCurve::LegendShowSymbol ) )
    {
        QSize sz = curve->symbol()->boundingRect().size();
        sz += QSize( 2, 2 ); // margin

        if ( curve->testLegendAttribute( QwtPlotCurve::LegendShowLine ) )
        {
            // Avoid, that the line is completely covered by the symbol

            int w = qCeil( 1.5 * sz.width() );
            if ( w % 2 )
                w++;

            sz.setWidth( qMax( 8, w ) );
        }

        curve->setLegendIconSize( sz );
    }
}

static int qwtVerifyRange( int size, int &i1, int &i2 )
{
    if ( size < 1 )
        return 0;

    i1 = qBound( 0, i1, size - 1 );
    i2 = qBound( 0, i2, size - 1 );

    if ( i1 > i2 )
        qSwap( i1, i2 );

    return ( i2 - i1 + 1 );
}

class QwtPlotCurve::PrivateData
{
public:
    PrivateData():
        style( QwtPlotCurve::Lines ),
        baseline( 0.0 ),
        symbol( NULL ),
        pen( Qt::black ),
        attributes( 0 ),
        paintAttributes( 
            QwtPlotCurve::ClipPolygons | QwtPlotCurve::FilterPoints ),
        legendAttributes( 0 )
    {
        curveFitter = new QwtSplineCurveFitter;
    }

    ~PrivateData()
    {
        delete symbol;
        delete curveFitter;
    }

    QwtPlotCurve::CurveStyle style;
    double baseline;

    const QwtSymbol *symbol;
    QwtCurveFitter *curveFitter;

    QPen pen;
    QBrush brush;

    QwtPlotCurve::CurveAttributes attributes;
    QwtPlotCurve::PaintAttributes paintAttributes;

    QwtPlotCurve::LegendAttributes legendAttributes;
};

QwtPlotCurve::QwtPlotCurve( const QwtText &title ):
    QwtPlotSeriesItem( title )
{
    init();
}

QwtPlotCurve::QwtPlotCurve( const QString &title ):
    QwtPlotSeriesItem( QwtText( title ) )
{
    init();
}

QwtPlotCurve::~QwtPlotCurve()
{
    delete d_data;
}

void QwtPlotCurve::init()
{
    setItemAttribute( QwtPlotItem::Legend );
    setItemAttribute( QwtPlotItem::AutoScale );

    d_data = new PrivateData;
    setData( new QwtPointSeriesData() );

    setZ( 20.0 );
}

int QwtPlotCurve::rtti() const
{
    return QwtPlotItem::Rtti_PlotCurve;
}

void QwtPlotCurve::setPaintAttribute( PaintAttribute attribute, bool on )
{
    if ( on )
        d_data->paintAttributes |= attribute;
    else
        d_data->paintAttributes &= ~attribute;
}

bool QwtPlotCurve::testPaintAttribute( PaintAttribute attribute ) const
{
    return ( d_data->paintAttributes & attribute );
}

void QwtPlotCurve::setLegendAttribute( LegendAttribute attribute, bool on )
{
    if ( on != testLegendAttribute( attribute ) )
    {
        if ( on )
            d_data->legendAttributes |= attribute;
        else
            d_data->legendAttributes &= ~attribute;

        qwtUpdateLegendIconSize( this );
        legendChanged();
    }
}

bool QwtPlotCurve::testLegendAttribute( LegendAttribute attribute ) const
{
    return ( d_data->legendAttributes & attribute );
}

void QwtPlotCurve::setStyle( CurveStyle style )
{
    if ( style != d_data->style )
    {
        d_data->style = style;

        legendChanged();
        itemChanged();
    }
}

QwtPlotCurve::CurveStyle QwtPlotCurve::style() const
{
    return d_data->style;
}

void QwtPlotCurve::setSymbol( QwtSymbol *symbol )
{
    if ( symbol != d_data->symbol )
    {
        delete d_data->symbol;
        d_data->symbol = symbol;

        qwtUpdateLegendIconSize( this );

        legendChanged();
        itemChanged();
    }
}

const QwtSymbol *QwtPlotCurve::symbol() const
{
    return d_data->symbol;
}

void QwtPlotCurve::setPen( const QColor &color, qreal width, Qt::PenStyle style )
{
    setPen( QPen( color, width, style ) );
}

void QwtPlotCurve::setPen( const QPen &pen )
{
    if ( pen != d_data->pen )
    {
        d_data->pen = pen;

        legendChanged();
        itemChanged();
    }
}

const QPen& QwtPlotCurve::pen() const
{
    return d_data->pen;
}

void QwtPlotCurve::setBrush( const QBrush &brush )
{
    if ( brush != d_data->brush )
    {
        d_data->brush = brush;

        legendChanged();
        itemChanged();
    }
}

const QBrush& QwtPlotCurve::brush() const
{
    return d_data->brush;
}

void QwtPlotCurve::drawSeries( QPainter *painter,
    const QwtScaleMap &xMap, const QwtScaleMap &yMap,
    const QRectF &canvasRect, int from, int to ) const
{
    const size_t numSamples = dataSize();

    if ( !painter || numSamples <= 0 )
        return;

    if ( to < 0 )
        to = numSamples - 1;

    if ( qwtVerifyRange( numSamples, from, to ) > 0 )
    {
        painter->save();
        painter->setPen( d_data->pen );

        /*
          Qt 4.0.0 is slow when drawing lines, but it's even
          slower when the painter has a brush. So we don't
          set the brush before we really need it.
         */

        drawCurve( painter, d_data->style, xMap, yMap, canvasRect, from, to );
        painter->restore();

        if ( d_data->symbol &&
            ( d_data->symbol->style() != QwtSymbol::NoSymbol ) )
        {
            painter->save();
            drawSymbols( painter, *d_data->symbol,
                xMap, yMap, canvasRect, from, to );
            painter->restore();
        }
    }
}

void QwtPlotCurve::drawCurve( QPainter *painter, int style,
    const QwtScaleMap &xMap, const QwtScaleMap &yMap,
    const QRectF &canvasRect, int from, int to ) const
{
    switch ( style )
    {
        case Lines:
            if ( testCurveAttribute( Fitted ) )
            {
                // we always need the complete
                // curve for fitting
                from = 0;
                to = dataSize() - 1;
            }
            drawLines( painter, xMap, yMap, canvasRect, from, to );
            break;
        case Sticks:
            drawSticks( painter, xMap, yMap, canvasRect, from, to );
            break;
        case Steps:
            drawSteps( painter, xMap, yMap, canvasRect, from, to );
            break;
        case Dots:
            drawDots( painter, xMap, yMap, canvasRect, from, to );
            break;
        case LinesAndDots:
        {
            if ( testCurveAttribute( Fitted ) )
            {
                from = 0;
                to = dataSize() - 1;
            }
            drawLines( painter, xMap, yMap, canvasRect, from, to );

            QPen prev_pen = painter->pen();
            QPen new_pen  = prev_pen;
            new_pen.setWidth( prev_pen.width() * 3);

            painter->setPen( new_pen );
            drawDots( painter, xMap, yMap, canvasRect, from, to );
            painter->setPen( prev_pen );
        }
        break;
        case NoCurve:
        default:
            break;
    }
}

void QwtPlotCurve::drawLines( QPainter *painter,
    const QwtScaleMap &xMap, const QwtScaleMap &yMap,
    const QRectF &canvasRect, int from, int to ) const
{
    if ( from > to )
        return;

    const bool doFit = ( d_data->attributes & Fitted ) && d_data->curveFitter;
    const bool doAlign = !doFit && QwtPainter::roundingAlignment( painter );
    const bool doFill = ( d_data->brush.style() != Qt::NoBrush )
            && ( d_data->brush.color().alpha() > 0 );

    QRectF clipRect;
    if ( d_data->paintAttributes & ClipPolygons )
    {
        clipRect = qwtIntersectedClipRect( canvasRect, painter );

        const qreal pw = qMax( qreal( 1.0 ), painter->pen().widthF());
        clipRect = clipRect.adjusted(-pw, -pw, pw, pw);
    }

    bool doIntegers = false;

#if QT_VERSION < 0x040800
    if ( painter->paintEngine()->type() == QPaintEngine::Raster )
    {

        // For Qt <= 4.7 the raster paint engine is significantly faster
        // for rendering QPolygon than for QPolygonF. So let's
        // see if we can use it.

        // In case of filling or fitting performance doesn't count
        // because both operations are much more expensive
        // then drawing the polyline itself

        if ( !doFit && !doFill )
            doIntegers = true; 
    }
#endif

    QwtPointMapper mapper;

    if ( doAlign )
    {
        mapper.setFlag( QwtPointMapper::RoundPoints, true );
        mapper.setFlag( QwtPointMapper::WeedOutIntermediatePoints, 
            testPaintAttribute( FilterPointsAggressive ) );
    }

    mapper.setFlag( QwtPointMapper::WeedOutPoints, 
        testPaintAttribute( FilterPoints ) || 
        testPaintAttribute( FilterPointsAggressive ) );

    mapper.setBoundingRect( canvasRect );

    if ( doIntegers )
    {
        QPolygon polyline = mapper.toPolygon( 
            xMap, yMap, data(), from, to );

        if ( testPaintAttribute( ClipPolygons ) )
        {
            QwtClipper::clipPolygon( clipRect, polyline, false );
        }

        QwtPainter::drawPolyline( painter, polyline );
    }
    else
    {
        QPolygonF polyline = mapper.toPolygonF( xMap, yMap, data(), from, to );

        if ( doFill )
        {
            if ( doFit )
            {
                // it might be better to extend and draw the curvePath, but for 
                // the moment we keep an implementation, where we translate the
                // path back to a polyline.

                polyline = d_data->curveFitter->fitCurve( polyline );
            }

            if ( painter->pen().style() != Qt::NoPen )
            {
                // here we are wasting memory for the filled copy,
                // do polygon clipping twice etc .. TODO

                QPolygonF filled = polyline;
                fillCurve( painter, xMap, yMap, canvasRect, filled );
                filled.clear();

                if ( d_data->paintAttributes & ClipPolygons )
                    QwtClipper::clipPolygonF( clipRect, polyline, false );

                QwtPainter::drawPolyline( painter, polyline );
            }
            else
            {
                fillCurve( painter, xMap, yMap, canvasRect, polyline );
            }
        }
        else
        {
            if ( testPaintAttribute( ClipPolygons ) )
            {
                QwtClipper::clipPolygonF( clipRect, polyline, false );
            }

            if ( doFit )
            {
                if ( d_data->curveFitter->mode() == QwtCurveFitter::Path )
                {
                    const QPainterPath curvePath = 
                        d_data->curveFitter->fitCurvePath( polyline );

                    painter->drawPath( curvePath );
                }
                else
                {
                    polyline = d_data->curveFitter->fitCurve( polyline );
                    QwtPainter::drawPolyline( painter, polyline );
                }
            }
            else
            {
                QwtPainter::drawPolyline( painter, polyline );
            }
        }
    }
}

void QwtPlotCurve::drawSticks( QPainter *painter,
    const QwtScaleMap &xMap, const QwtScaleMap &yMap,
    const QRectF &, int from, int to ) const
{
    painter->save();
    painter->setRenderHint( QPainter::Antialiasing, false );

    const bool doAlign = QwtPainter::roundingAlignment( painter );

    double x0 = xMap.transform( d_data->baseline );
    double y0 = yMap.transform( d_data->baseline );
    if ( doAlign )
    {
        x0 = qRound( x0 );
        y0 = qRound( y0 );
    }

    const Qt::Orientation o = orientation();

    const QwtSeriesData<QPointF> *series = data();

    for ( int i = from; i <= to; i++ )
    {
        const QPointF sample = series->sample( i );
        double xi = xMap.transform( sample.x() );
        double yi = yMap.transform( sample.y() );
        if ( doAlign )
        {
            xi = qRound( xi );
            yi = qRound( yi );
        }

        if ( o == Qt::Horizontal )
            QwtPainter::drawLine( painter, x0, yi, xi, yi );
        else
            QwtPainter::drawLine( painter, xi, y0, xi, yi );
    }

    painter->restore();
}

void QwtPlotCurve::drawDots( QPainter *painter,
    const QwtScaleMap &xMap, const QwtScaleMap &yMap,
    const QRectF &canvasRect, int from, int to ) const
{
    const QColor color = painter->pen().color();

    if ( painter->pen().style() == Qt::NoPen || color.alpha() == 0 )
    {
        return;
    }

    const bool doFill = ( d_data->brush.style() != Qt::NoBrush )
            && ( d_data->brush.color().alpha() > 0 );
    const bool doAlign = QwtPainter::roundingAlignment( painter );

    QwtPointMapper mapper;
    mapper.setBoundingRect( canvasRect );
    mapper.setFlag( QwtPointMapper::RoundPoints, doAlign );

    if ( d_data->paintAttributes & FilterPoints )
    {
        if ( ( color.alpha() == 255 )
            && !( painter->renderHints() & QPainter::Antialiasing ) )
        {
            mapper.setFlag( QwtPointMapper::WeedOutPoints, true );
        }
    }

    if ( doFill )
    {
        mapper.setFlag( QwtPointMapper::WeedOutPoints, false );

        QPolygonF points = mapper.toPointsF( 
            xMap, yMap, data(), from, to );

        QwtPainter::drawPoints( painter, points );
        fillCurve( painter, xMap, yMap, canvasRect, points );
    }
    else if ( d_data->paintAttributes & ImageBuffer )
    {
        const QImage image = mapper.toImage( xMap, yMap,
            data(), from, to, d_data->pen, 
            painter->testRenderHint( QPainter::Antialiasing ),
            renderThreadCount() );

        painter->drawImage( canvasRect.toAlignedRect(), image );
    }
    else if ( d_data->paintAttributes & MinimizeMemory )
    {
        const QwtSeriesData<QPointF> *series = data();

        for ( int i = from; i <= to; i++ )
        {
            const QPointF sample = series->sample( i );

            double xi = xMap.transform( sample.x() );
            double yi = yMap.transform( sample.y() );

            if ( doAlign )
            {
                xi = qRound( xi );
                yi = qRound( yi );
            }

            QwtPainter::drawPoint( painter, QPointF( xi, yi ) );
        }
    }
    else
    {
        if ( doAlign )
        {
            const QPolygon points = mapper.toPoints(
                xMap, yMap, data(), from, to ); 

            QwtPainter::drawPoints( painter, points );
        }
        else
        {
            const QPolygonF points = mapper.toPointsF( 
                xMap, yMap, data(), from, to );

            QwtPainter::drawPoints( painter, points );
        }
    }
}

void QwtPlotCurve::drawSteps( QPainter *painter,
    const QwtScaleMap &xMap, const QwtScaleMap &yMap,
    const QRectF &canvasRect, int from, int to ) const
{
    const bool doAlign = QwtPainter::roundingAlignment( painter );

    QPolygonF polygon( 2 * ( to - from ) + 1 );
    QPointF *points = polygon.data();

    bool inverted = orientation() == Qt::Vertical;
    if ( d_data->attributes & Inverted )
        inverted = !inverted;

    const QwtSeriesData<QPointF> *series = data();

    int i, ip;
    for ( i = from, ip = 0; i <= to; i++, ip += 2 )
    {
        const QPointF sample = series->sample( i );
        double xi = xMap.transform( sample.x() );
        double yi = yMap.transform( sample.y() );
        if ( doAlign )
        {
            xi = qRound( xi );
            yi = qRound( yi );
        }

        if ( ip > 0 )
        {
            const QPointF &p0 = points[ip - 2];
            QPointF &p = points[ip - 1];

            if ( inverted )
            {
                p.rx() = p0.x();
                p.ry() = yi;
            }
            else
            {
                p.rx() = xi;
                p.ry() = p0.y();
            }
        }

        points[ip].rx() = xi;
        points[ip].ry() = yi;
    }

    if ( d_data->paintAttributes & ClipPolygons )
    {
        QRectF clipRect = qwtIntersectedClipRect( canvasRect, painter );

        const qreal pw = qMax( qreal( 1.0 ), painter->pen().widthF());
        clipRect = clipRect.adjusted(-pw, -pw, pw, pw);

        const QPolygonF clipped = QwtClipper::clippedPolygonF( 
            clipRect, polygon, false );

        QwtPainter::drawPolyline( painter, clipped );
    }
    else
    {
        QwtPainter::drawPolyline( painter, polygon );
    }

    if ( d_data->brush.style() != Qt::NoBrush )
        fillCurve( painter, xMap, yMap, canvasRect, polygon );
}


void QwtPlotCurve::setCurveAttribute( CurveAttribute attribute, bool on )
{
    if ( bool( d_data->attributes & attribute ) == on )
        return;

    if ( on )
        d_data->attributes |= attribute;
    else
        d_data->attributes &= ~attribute;

    itemChanged();
}

bool QwtPlotCurve::testCurveAttribute( CurveAttribute attribute ) const
{
    return d_data->attributes & attribute;
}

void QwtPlotCurve::setCurveFitter( QwtCurveFitter *curveFitter )
{
    delete d_data->curveFitter;
    d_data->curveFitter = curveFitter;

    itemChanged();
}

QwtCurveFitter *QwtPlotCurve::curveFitter() const
{
    return d_data->curveFitter;
}

void QwtPlotCurve::fillCurve( QPainter *painter,
    const QwtScaleMap &xMap, const QwtScaleMap &yMap,
    const QRectF &canvasRect, QPolygonF &polygon ) const
{
    if ( d_data->brush.style() == Qt::NoBrush )
        return;

    closePolyline( painter, xMap, yMap, polygon );
    if ( polygon.count() <= 2 ) // a line can't be filled
        return;

    QBrush brush = d_data->brush;
    if ( !brush.color().isValid() )
        brush.setColor( d_data->pen.color() );

    if ( d_data->paintAttributes & ClipPolygons )
    {
        const QRectF clipRect = qwtIntersectedClipRect( canvasRect, painter );
        QwtClipper::clipPolygonF( clipRect, polygon, true );
    }

    painter->save();

    painter->setPen( Qt::NoPen );
    painter->setBrush( brush );

    QwtPainter::drawPolygon( painter, polygon );

    painter->restore();
}

void QwtPlotCurve::closePolyline( QPainter *painter,
    const QwtScaleMap &xMap, const QwtScaleMap &yMap,
    QPolygonF &polygon ) const
{
    if ( polygon.size() < 2 )
        return;

    const bool doAlign = QwtPainter::roundingAlignment( painter );

    double baseline = d_data->baseline;
    
    if ( orientation() == Qt::Vertical )
    {
        if ( yMap.transformation() )
            baseline = yMap.transformation()->bounded( baseline );

        double refY = yMap.transform( baseline );
        if ( doAlign )
            refY = qRound( refY );

        polygon += QPointF( polygon.last().x(), refY );
        polygon += QPointF( polygon.first().x(), refY );
    }
    else
    {
        if ( xMap.transformation() )
            baseline = xMap.transformation()->bounded( baseline );

        double refX = xMap.transform( baseline );
        if ( doAlign )
            refX = qRound( refX );

        polygon += QPointF( refX, polygon.last().y() );
        polygon += QPointF( refX, polygon.first().y() );
    }
}

void QwtPlotCurve::drawSymbols( QPainter *painter, const QwtSymbol &symbol,
    const QwtScaleMap &xMap, const QwtScaleMap &yMap,
    const QRectF &canvasRect, int from, int to ) const
{
    QwtPointMapper mapper;
    mapper.setFlag( QwtPointMapper::RoundPoints, 
        QwtPainter::roundingAlignment( painter ) );
    mapper.setFlag( QwtPointMapper::WeedOutPoints, 
        testPaintAttribute( QwtPlotCurve::FilterPoints ) );

    const QRectF clipRect = qwtIntersectedClipRect( canvasRect, painter );
    mapper.setBoundingRect( clipRect );

    const int chunkSize = 500;

    for ( int i = from; i <= to; i += chunkSize )
    {
        const int n = qMin( chunkSize, to - i + 1 );

        const QPolygonF points = mapper.toPointsF( xMap, yMap,
            data(), i, i + n - 1 );

        if ( points.size() > 0 )
            symbol.drawSymbols( painter, points );
    }
}

void QwtPlotCurve::setBaseline( double value )
{
    if ( d_data->baseline != value )
    {
        d_data->baseline = value;
        itemChanged();
    }
}

double QwtPlotCurve::baseline() const
{
    return d_data->baseline;
}

int QwtPlotCurve::closestPoint( const QPoint &pos, double *dist ) const
{
    const size_t numSamples = dataSize();

    if ( plot() == NULL || numSamples <= 0 )
        return -1;

    const QwtSeriesData<QPointF> *series = data();

    const QwtScaleMap xMap = plot()->canvasMap( xAxis() );
    const QwtScaleMap yMap = plot()->canvasMap( yAxis() );

    int index = -1;
    double dmin = 1.0e10;

    for ( uint i = 0; i < numSamples; i++ )
    {
        const QPointF sample = series->sample( i );

        const double cx = xMap.transform( sample.x() ) - pos.x();
        const double cy = yMap.transform( sample.y() ) - pos.y();

        const double f = qwtSqr( cx ) + qwtSqr( cy );
        if ( f < dmin )
        {
            index = i;
            dmin = f;
        }
    }
    if ( dist )
        *dist = qSqrt( dmin );

    return index;
}

QwtGraphic QwtPlotCurve::legendIcon( int index, 
    const QSizeF &size ) const
{
    Q_UNUSED( index );

    if ( size.isEmpty() )
        return QwtGraphic();

    QwtGraphic graphic;
    graphic.setDefaultSize( size );
    graphic.setRenderHint( QwtGraphic::RenderPensUnscaled, true );

    QPainter painter( &graphic );
    painter.setRenderHint( QPainter::Antialiasing,
        testRenderHint( QwtPlotItem::RenderAntialiased ) );

    if ( d_data->legendAttributes == 0 ||
        d_data->legendAttributes & QwtPlotCurve::LegendShowBrush )
    {
        QBrush brush = d_data->brush;

        if ( brush.style() == Qt::NoBrush &&
            d_data->legendAttributes == 0 )
        {
            if ( style() != QwtPlotCurve::NoCurve )
            {
                brush = QBrush( pen().color() );
            }
            else if ( d_data->symbol &&
                ( d_data->symbol->style() != QwtSymbol::NoSymbol ) )
            {
                brush = QBrush( d_data->symbol->pen().color() );
            }
        }

        if ( brush.style() != Qt::NoBrush )
        {
            QRectF r( 0, 0, size.width(), size.height() );
            painter.fillRect( r, brush );
        }
    }

    if ( d_data->legendAttributes & QwtPlotCurve::LegendShowLine )
    {
        if ( pen() != Qt::NoPen )
        {
            QPen pn = pen();
            pn.setCapStyle( Qt::FlatCap );

            painter.setPen( pn );

            const double y = 0.5 * size.height();
            QwtPainter::drawLine( &painter, 0.0, y, size.width(), y );
        }
    }

    if ( d_data->legendAttributes & QwtPlotCurve::LegendShowSymbol )
    {
        if ( d_data->symbol )
        {
            QRectF r( 0, 0, size.width(), size.height() );
            d_data->symbol->drawSymbol( &painter, r );
        }
    }

    return graphic;
}

void QwtPlotCurve::setSamples( const QVector<QPointF> &samples )
{
    setData( new QwtPointSeriesData( samples ) );
}

void QwtPlotCurve::setSamples( QwtSeriesData<QPointF> *data )
{
    setData( data );
}

#ifndef QWT_NO_COMPAT

void QwtPlotCurve::setRawSamples( 
    const double *xData, const double *yData, int size )
{
    setData( new QwtCPointerData( xData, yData, size ) );
}

void QwtPlotCurve::setSamples( 
    const double *xData, const double *yData, int size )
{
    setData( new QwtPointArrayData( xData, yData, size ) );
}

void QwtPlotCurve::setSamples( const QVector<double> &xData,
    const QVector<double> &yData )
{
    setData( new QwtPointArrayData( xData, yData ) );
}

#endif // !QWT_NO_COMPAT