C++ (Cpp) QwtPolarItem::updateScaleDiv Beispiele

Beispiel #1

Datei: qwt_polar_plot.cpp Projekt: ACorradini/QGIS

void QwtPolarPlot::updateScale( int scaleId )
{
  if ( scaleId < 0 || scaleId >= QwtPolar::ScaleCount )
    return;

  ScaleData &d = d_data->scaleData[scaleId];

  double minValue = d.minValue;
  double maxValue = d.maxValue;
  double stepSize = d.stepSize;

  if ( scaleId == QwtPolar::ScaleRadius && d.doAutoScale )
  {
    QwtDoubleInterval interval;

    const QwtPolarItemList& itmList = itemList();
    for ( QwtPolarItemIterator it = itmList.begin();
          it != itmList.end(); ++it )
    {
      const QwtPolarItem *item = *it;
      if ( item->testItemAttribute( QwtPolarItem::AutoScale ) )
        interval |= item->boundingInterval( scaleId );
    }

    minValue = interval.minValue();
    maxValue = interval.maxValue();

    d.scaleEngine->autoScale( d.maxMajor,
                              minValue, maxValue, stepSize );
    d.scaleDiv.invalidate();
  }

  if ( !d.scaleDiv.isValid() )
  {
    d.scaleDiv = d.scaleEngine->divideScale(
                   minValue, maxValue,
                   d.maxMajor, d.maxMinor, stepSize );
  }

  const QwtDoubleInterval interval = visibleInterval();

  const QwtPolarItemList& itmList = itemList();
  for ( QwtPolarItemIterator it = itmList.begin();
        it != itmList.end(); ++it )
  {
    QwtPolarItem *item = *it;
    item->updateScaleDiv( *scaleDiv( QwtPolar::Azimuth ),
                          *scaleDiv( QwtPolar::Radius ), interval );
  }
}