C++ QwtInterval类代码示例

void QxrdImagePlot::recalculateDisplayedRange()
{
  QxrdImagePlotSettingsPtr set(m_ImagePlotSettings);

  if (set && m_DataRaster) {
    double mindis, maxdis;

    if (set->get_DisplayScalingMode() == PercentageMode) {
      double minv = m_DataRaster->minValue();
      double maxv = m_DataRaster->maxValue();
      double del = maxv-minv;

      mindis = minv+del*set->get_DisplayMinimumPct()/100.0;
      maxdis = minv+del*set->get_DisplayMaximumPct()/100.0;
    } else if (set->get_DisplayScalingMode() == PercentileMode) {
      QwtInterval range = m_DataRaster->percentileRange(set->get_DisplayMinimumPctle(), set->get_DisplayMaximumPctle());

      mindis = range.minValue();
      maxdis = range.maxValue();
    } else {
      mindis = set->get_DisplayMinimumVal();
      maxdis = set->get_DisplayMaximumVal();
    }

    m_DataRaster->setDisplayedRange(mindis, maxdis);

    replotImage();
  }
}

double QwtPlotRescaler::pixelDist( int axis, const QSize &size ) const
{
    const QwtInterval intv = intervalHint( axis );

    double dist = 0.0;
    if ( !intv.isNull() )
    {
        if ( axis == referenceAxis() )
            dist = intv.width();
        else
        {
            const double r = aspectRatio( axis );
            if ( r > 0.0 )
                dist = intv.width() * r;
        }
    }

    if ( dist > 0.0 )
    {
        if ( orientation( axis ) == Qt::Horizontal )
            dist /= size.width();
        else
            dist /= size.height();
    }

    return dist;
}

/*!
  \brief Align an interval to a step size

  The limits of an interval are aligned that both are integer
  multiples of the step size.

  \param interval Interval
  \param stepSize Step size

  \return Aligned interval
*/
QwtInterval QwtLinearScaleEngine::align(
    const QwtInterval &interval, double stepSize ) const
{
    double x1 = interval.minValue();
    double x2 = interval.maxValue();

    // when there is no rounding beside some effect, when
    // calculating with doubles, we keep the original value

    const double eps = 0.000000000001; // since Qt 4.8: qFuzzyIsNull
    if ( -DBL_MAX + stepSize <= x1 )
    {
        const double x = QwtScaleArithmetic::floorEps( x1, stepSize );
        if ( qAbs(x) <= eps || !qFuzzyCompare( x1, x ) )
            x1 = x;
    }

    if ( DBL_MAX - stepSize >= x2 )
    {
        const double x = QwtScaleArithmetic::ceilEps( x2, stepSize );
        if ( qAbs(x) <= eps || !qFuzzyCompare( x2, x ) )
            x2 = x;
    }

    return QwtInterval( x1, x2 );
}

/*!
  Synchronize an axis scale according to the scale of the reference axis

  \param axis Axis index ( see QwtPlot::AxisId )
  \param reference Interval of the reference axis
  \param size Size of the canvas

  \return New interval for axis
*/
QwtInterval QwtPlotRescaler::syncScale( int axis,
    const QwtInterval& reference, const QSize &size ) const
{
    double dist;
    if ( orientation( referenceAxis() ) == Qt::Horizontal )
        dist = reference.width() / size.width();
    else
        dist = reference.width() / size.height();

    if ( orientation( axis ) == Qt::Horizontal )
        dist *= size.width();
    else
        dist *= size.height();

    dist /= aspectRatio( axis );

    QwtInterval intv;
    if ( rescalePolicy() == Fitting )
        intv = intervalHint( axis );
    else
        intv = interval( axis );

    intv = expandInterval( intv, dist, expandingDirection( axis ) );

    return intv;
}

/*!
   \return Bounding rectangle of the data
   \sa QwtPlotRasterItem::interval()
*/
QRectF QwtPlotRasterItem::boundingRect() const
{
    const QwtInterval intervalX = interval( Qt::XAxis );
    const QwtInterval intervalY = interval( Qt::YAxis );

    if ( !intervalX.isValid() && !intervalY.isValid() )
        return QRectF(); // no bounding rect

    QRectF r;

    if ( intervalX.isValid() )
    {
        r.setLeft( intervalX.minValue() );
        r.setRight( intervalX.maxValue() );
    }
    else
    {
        r.setLeft(-0.5 * FLT_MAX);
        r.setWidth(FLT_MAX);
    }

    if ( intervalY.isValid() )
    {
        r.setTop( intervalY.minValue() );
        r.setBottom( intervalY.maxValue() );
    }
    else
    {
        r.setTop(-0.5 * FLT_MAX);
        r.setHeight(FLT_MAX);
    }

    return r.normalized();
}

 void fill(Plot* plot)
 {
     plot->setAxisTitle(axis, donor->axisTitle(axis));
     const QwtInterval interval = donor->axisInterval(axis);
     plot->setAxisScale(axis, interval.minValue(), interval.maxValue(), donor->axisStep(QwtPlot::Axis(axis)));
     plot->replot();
 }

/*!
   \brief Calculate a scale division

   \param x1 First interval limit
   \param x2 Second interval limit
   \param maxMajorSteps Maximum for the number of major steps
   \param maxMinorSteps Maximum number of minor steps
   \param stepSize Step size. If stepSize == 0, the engine
                   calculates one.
*/
QwtScaleDiv QwtLinearScaleEngine::divideScale( double x1, double x2,
    int maxMajorSteps, int maxMinorSteps, double stepSize ) const
{
    QwtInterval interval = QwtInterval( x1, x2 ).normalized();
    if ( interval.width() <= 0 )
        return QwtScaleDiv();

    stepSize = qAbs( stepSize );
    if ( stepSize == 0.0 )
    {
        if ( maxMajorSteps < 1 )
            maxMajorSteps = 1;

        stepSize = QwtScaleArithmetic::divideInterval( 
            interval.width(), maxMajorSteps, base() );
    }

    QwtScaleDiv scaleDiv;

    if ( stepSize != 0.0 )
    {
        QList<double> ticks[QwtScaleDiv::NTickTypes];
        buildTicks( interval, stepSize, maxMinorSteps, ticks );

        scaleDiv = QwtScaleDiv( interval, ticks );
    }

    if ( x1 > x2 )
        scaleDiv.invert();

    return scaleDiv;
}

/*!
  Draw a sample

  \param painter Painter
  \param xMap x map
  \param yMap y map
  \param canvasRect Contents rectangle of the canvas
  \param boundingInterval Bounding interval of sample values
  \param index Index of the sample to be painted
  \param sample Sample value

  \sa drawSeries()
*/
void QwtPlotMultiBarChart::drawSample( QPainter *painter,
    const QwtScaleMap &xMap, const QwtScaleMap &yMap,
    const QRectF &canvasRect, const QwtInterval &boundingInterval,
    int index, const QwtSetSample& sample ) const
{
    if ( sample.set.size() <= 0 )
        return;

    double sampleW;

    if ( orientation() == Qt::Horizontal )
    {
        sampleW = sampleWidth( yMap, canvasRect.height(),
            boundingInterval.width(), sample.value );
    }
    else
    {
        sampleW = sampleWidth( xMap, canvasRect.width(),
            boundingInterval.width(), sample.value );
    }

    if ( d_data->style == Stacked )
    {
        drawStackedBars( painter, xMap, yMap,
            canvasRect, index, sampleW, sample );
    }
    else
    {
        drawGroupedBars( painter, xMap, yMap,
            canvasRect, index, sampleW, sample );
    }
}

/*!
  Redraw the canvas items.

  \param painter Painter used for drawing
  \param azimuthMap Maps azimuth values to values related to 0.0, M_2PI
  \param radialMap Maps radius values into painter coordinates.
  \param pole Position of the pole in painter coordinates
  \param radius Radius of the complete plot area in painter coordinates
  \param canvasRect Contents rect of the canvas in painter coordinates
*/
void QwtPolarPlot::drawItems( QPainter *painter,
    const QwtScaleMap &azimuthMap, const QwtScaleMap &radialMap,
    const QPointF &pole, double radius,
    const QRectF &canvasRect ) const
{
    const QRectF pr = plotRect( canvasRect );

    const QwtPolarItemList& itmList = itemList();
    for ( QwtPolarItemIterator it = itmList.begin();
            it != itmList.end(); ++it )
    {
        QwtPolarItem *item = *it;
        if ( item && item->isVisible() )
        {
            painter->save();

            // Unfortunately circular clipping slows down
            // painting a lot. So we better try to avoid it.

            bool doClipping = false;
            if ( item->rtti() != QwtPolarItem::Rtti_PolarGrid )
            {
                const QwtInterval intv =
                    item->boundingInterval( QwtPolar::Radius );

                if ( !intv.isValid() )
                    doClipping = true;
                else
                {
                    if ( radialMap.s1() < radialMap.s2() )
                        doClipping = intv.maxValue() > radialMap.s2();
                    else
                        doClipping = intv.minValue() < radialMap.s2();
                }
            }

            if ( doClipping )
            {
                const int margin = item->marginHint();

                const QRectF clipRect = pr.adjusted(
                    -margin, -margin, margin, margin );
                if ( !clipRect.contains( canvasRect ) )
                {
                    QRegion clipRegion( clipRect.toRect(), QRegion::Ellipse );
                    painter->setClipRegion( clipRegion, Qt::IntersectClip );
                }
            }

            painter->setRenderHint( QPainter::Antialiasing,
                item->testRenderHint( QwtPolarItem::RenderAntialiased ) );

            item->draw( painter, azimuthMap, radialMap,
                pole, radius, canvasRect );

            painter->restore();
        }
    }
}

void SweepInspector::loadSweep(int index) {
  //load in new sweep values from data
  if (data == NULL) return;
  if ( (index < 0)  || (index >= data->getNumSweeps())) return;

  //remove old data and get new
  if (d_curve) d_curve->attach(NULL);
  detachItems();
  fsweep sweep = data->getSweep(index);

  d_curve = new QwtPlotCurve( data->timestampFromIndex(index) ); //Qwt will delete() this when its done with it
  d_curve->setRenderHint( QwtPlotItem::RenderAntialiased );
  d_curve->setStyle( QwtPlotCurve::Lines );
  d_curve->setPen( QColor( Qt::yellow ), 2, Qt::SolidLine );
  d_curve->setSamples( sweep );
  d_curve->attach(this);

  QwtInterval frange = data->limits(FREQ);
  //setAxisScale(QwtPlot::xBottom, frange.minValue(), frange.maxValue(), (frange.maxValue() - frange.minValue())/ 5.0);
  //setAxisScale(QwtPlot::yLeft, -135, 20, 10.0);
  setTitle( QString("RF Sweep @ %1").arg(data->timestampFromIndex(index)) );
  //set maximum zoom out
  zoomer->setZoomBase(QRectF(QPointF(frange.minValue(), 40), QPointF(frange.maxValue(), -135)));
  zoomer->zoomBase();

  //find max, min, and average values and drop it on plot as well
  double max = sweep.first().y(), min = sweep.first().y(), avg=0;
  for(int i=0; i < sweep.size(); i++) {
    max = std::max(max, sweep.at(i).y());
    min = std::min(min, sweep.at(i).y());
    avg += sweep.at(i).y();
  } avg /= sweep.size();

  //add markers onto the plot
  QwtPlotMarker *one = new QwtPlotMarker(), *two = new QwtPlotMarker();
  one->attach(this); one->setAxes(QwtPlot::xTop, QwtPlot::yRight);
  two->attach(this); two->setAxes(QwtPlot::xTop, QwtPlot::yRight);

  QwtText tone = QwtText(QString("Max: %1 dBm\nMin: %2 dBm\nAvg: %3 dBm").arg(max).arg(min).arg(avg));
  tone.setFont( QFont( "Helvetica", 10, QFont::Bold ) );
  tone.setColor( Qt::green );
  tone.setRenderFlags(Qt::AlignTop | Qt::AlignLeft);

  one->setLabel(tone);
  one->setValue(0, 10);
  one->setLabelAlignment(Qt::AlignBottom | Qt::AlignRight);

  QwtText ttwo(data->plotText());
  ttwo.setFont( QFont( "Helvetica", 10, QFont::Bold ) );
  ttwo.setColor( Qt::white );
  ttwo.setRenderFlags(Qt::AlignBottom | Qt::AlignRight);

  two->setLabel(ttwo);
  two->setValue(10, 10);
  two->setLabelAlignment(Qt::AlignBottom | Qt::AlignLeft);

  replot();
  repaint();
}

static inline long double qwtIntervalWidthL( const QwtInterval &interval )
{
    if ( !interval.isValid() )
        return 0.0;

    return static_cast<long double>( interval.maxValue() )
        - static_cast<long double>( interval.minValue() );
}

/*!
   \brief Calculate a scale division for an interval

   \param x1 First interval limit
   \param x2 Second interval limit
   \param maxMajorSteps Maximum for the number of major steps
   \param maxMinorSteps Maximum number of minor steps
   \param stepSize Step size. If stepSize == 0, the engine
                   calculates one.

   \return Calculated scale division
*/
QwtScaleDiv QwtLogScaleEngine::divideScale( double x1, double x2,
    int maxMajorSteps, int maxMinorSteps, double stepSize ) const
{
    QwtInterval interval = QwtInterval( x1, x2 ).normalized();
    interval = interval.limited( LOG_MIN, LOG_MAX );

    if ( interval.width() <= 0 )
        return QwtScaleDiv();

    const double logBase = base();

    if ( interval.maxValue() / interval.minValue() < logBase )
    {
        // scale width is less than one decade -> build linear scale

        QwtLinearScaleEngine linearScaler;
        linearScaler.setAttributes( attributes() );
        linearScaler.setReference( reference() );
        linearScaler.setMargins( lowerMargin(), upperMargin() );

        if ( stepSize != 0.0 )
        {
            if ( stepSize < 0.0 )
                stepSize = -qPow( logBase, -stepSize );
            else
                stepSize = qPow( logBase, stepSize );
        }

        return linearScaler.divideScale( x1, x2,
            maxMajorSteps, maxMinorSteps, stepSize );
    }

    stepSize = qAbs( stepSize );
    if ( stepSize == 0.0 )
    {
        if ( maxMajorSteps < 1 )
            maxMajorSteps = 1;

        stepSize = divideInterval( 
            qwtLogInterval( logBase, interval ).width(), maxMajorSteps );
        if ( stepSize < 1.0 )
            stepSize = 1.0; // major step must be >= 1 decade
    }

    QwtScaleDiv scaleDiv;
    if ( stepSize != 0.0 )
    {
        QList<double> ticks[QwtScaleDiv::NTickTypes];
        buildTicks( interval, stepSize, maxMinorSteps, ticks );

        scaleDiv = QwtScaleDiv( interval, ticks );
    }

    if ( x1 > x2 )
        scaleDiv.invert();

    return scaleDiv;
}

Plot::Plot( QWidget *parent ):
    QwtPlot( parent ),
    d_formatType( 0 ),
    d_alpha(255)
{
    d_spectrogram = new QwtPlotSpectrogram();
    d_spectrogram->setRenderThreadCount( 0 ); // use system specific thread count
    d_spectrogram->setCachePolicy( QwtPlotRasterItem::PaintCache );

    QList<double> contourLevels;
    for ( double level = 0.5; level < 10.0; level += 1.0 )
        contourLevels += level;
    d_spectrogram->setContourLevels( contourLevels );

    d_spectrogram->setData( new SpectrogramData() );
    d_spectrogram->attach( this );

    const QwtInterval zInterval = d_spectrogram->data()->interval( Qt::ZAxis );

    // A color bar on the right axis
    QwtScaleWidget *rightAxis = axisWidget( QwtPlot::yRight );
    rightAxis->setTitle( "Intensity" );
    rightAxis->setColorBarEnabled( true );

    setAxisScale( QwtPlot::yRight, zInterval.minValue(), zInterval.maxValue() );
    enableAxis( QwtPlot::yRight );

    plotLayout()->setAlignCanvasToScales( true );

    setColorMap( Plot::RGBMap );

    // LeftButton for the zooming
    // MidButton for the panning
    // RightButton: zoom out by 1
    // Ctrl+RighButton: zoom out to full size

    QwtPlotZoomer* zoomer = new MyZoomer( canvas() );
    zoomer->setMousePattern( QwtEventPattern::MouseSelect2,
        Qt::RightButton, Qt::ControlModifier );
    zoomer->setMousePattern( QwtEventPattern::MouseSelect3,
        Qt::RightButton );

    QwtPlotPanner *panner = new QwtPlotPanner( canvas() );
    panner->setAxisEnabled( QwtPlot::yRight, false );
    panner->setMouseButton( Qt::MidButton );

    // Avoid jumping when labels with more/less digits
    // appear/disappear when scrolling vertically

    const QFontMetrics fm( axisWidget( QwtPlot::yLeft )->font() );
    QwtScaleDraw *sd = axisScaleDraw( QwtPlot::yLeft );
    sd->setMinimumExtent( fm.width( "100.00" ) );

    const QColor c( Qt::darkBlue );
    zoomer->setRubberBandPen( c );
    zoomer->setTrackerPen( c );
}

static inline bool qwtIsSampleInside( const QwtOHLCSample &sample,
    double tMin, double tMax, double vMin, double vMax )
{
    const double t = sample.time;
    const QwtInterval interval = sample.boundingInterval();

    const bool isOffScreen = ( t < tMin ) || ( t > tMax )
        || ( interval.maxValue() < vMin ) || ( interval.minValue() > vMax );

    return !isOffScreen;
}

void matrixofpixels::PixPlotSpect(int TypeOfSpec,QwtMatrixRasterData *rasterpixdata)
{
    changeitems();
    MapPlot->setData(rasterpixdata);
    MapPlot->setRenderThreadCount(0);
    setAxisAutoScale(this->xTop);
    setAxisAutoScale(this->xBottom);



    switch (TypeOfSpec)
    {
    case 1:
        MapPlot->setColorMap(new ColorMap(BLUERED));
        break;
    case 2:
        MapPlot->setColorMap(new ColorMap(BLACKWHITE));
        break;
    default:
        MapPlot->setColorMap(new ColorMap(BLUERED));
    }

    MapPlot->attach(/*MainPlot*/this);

    const QwtInterval zInterval = MapPlot->data()->interval(Qt::ZAxis);

    setAxisScale(QwtPlot::xBottom, 0, Npix);
    setAxisMaxMinor(QwtPlot::xBottom, 0);
    setAxisScale(QwtPlot::yLeft, 0, Npix);
    setAxisMaxMinor(QwtPlot::yLeft, 0);

    //rightAxis = new QwtScaleWidget();
    QwtScaleWidget *rightAxis = axisWidget(QwtPlot::yRight);

    //rightAxis = axisWidget(QwtPlot::yRight);
    rightAxis->setColorBarEnabled(true);
    rightAxis->setColorBarWidth(20);
    rightAxis->setColorMap(zInterval, new ColorMap(TypeOfSpec) );
    //ColorMap(TypeOfSpec);

    plotLayout()->setAlignCanvasToScales(true);

    setAxisScale(QwtPlot::yRight,zInterval.minValue(),zInterval.maxValue());
    enableAxis(QwtPlot::yRight);
    replot();
    setAutoFillBackground(true);

    /**
      setAutoFillBackground(true); - autozapolnenie, ctobi isklyuchit'
    nalozjeniya graphikov
    */

}