@Override public Range findRangeBounds(XYDataset dataset){
  ParamChecks.nullNotPermitted(dataset,"dataset");
  double minimum=Double.POSITIVE_INFINITY;
  double maximum=Double.NEGATIVE_INFINITY;
  int seriesCount=dataset.getSeriesCount();
  double lvalue;
  double uvalue;
  if (dataset instanceof VectorXYDataset) {
    VectorXYDataset vdataset=(VectorXYDataset)dataset;
    for (int series=0; series < seriesCount; series++) {
      int itemCount=dataset.getItemCount(series);
      for (int item=0; item < itemCount; item++) {
        double delta=vdataset.getVectorYValue(series,item);
        if (delta < 0.0) {
          uvalue=vdataset.getYValue(series,item);
          lvalue=uvalue + delta;
        }
 else {
          lvalue=vdataset.getYValue(series,item);
          uvalue=lvalue + delta;
        }
        minimum=Math.min(minimum,lvalue);
        maximum=Math.max(maximum,uvalue);
      }
    }
  }
 else {
    for (int series=0; series < seriesCount; series++) {
      int itemCount=dataset.getItemCount(series);
      for (int item=0; item < itemCount; item++) {
        lvalue=dataset.getYValue(series,item);
        uvalue=lvalue;
        minimum=Math.min(minimum,lvalue);
        maximum=Math.max(maximum,uvalue);
      }
    }
  }
  if (minimum > maximum) {
    return null;
  }
 else {
    return new Range(minimum,maximum);
  }
}

@ Override public Range findRangeBounds ( XYDataset dataset ) { ParamChecks . nullNotPermitted ( dataset , "dataset" ) ; double minimum = Double . POSITIVE_INFINITY ; double maximum = Double . NEGATIVE_INFINITY ; int seriesCount = dataset . getSeriesCount ( ) ; double lvalue ; double uvalue ; if ( dataset instanceof VectorXYDataset ) { VectorXYDataset vdataset = ( VectorXYDataset ) dataset ; for ( int series = 0 ; series < seriesCount ; series ++ ) { int itemCount = dataset . getItemCount ( series ) ; for ( int item = 0 ; item < itemCount ; item ++ ) { double delta = vdataset . getVectorYValue ( series , item ) ; if ( delta < 0.0 ) { uvalue = vdataset . getYValue ( series , item ) ; lvalue = uvalue + delta ; } else { lvalue = vdataset . getYValue ( series , item ) ; uvalue = lvalue + delta ; } minimum = Math . min ( minimum , lvalue ) ; maximum = Math . max ( maximum , uvalue ) ; } } } else { for ( int series = 0 ; series < seriesCount ; series ++ ) { int itemCount = dataset . getItemCount ( series ) ; for ( int item = 0 ; item < itemCount ; item ++ ) { lvalue = dataset . getYValue ( series , item ) ; uvalue = lvalue ; minimum = Math . min ( minimum , lvalue ) ; maximum = Math . max ( maximum , uvalue ) ; } } } if ( minimum > maximum ) { return null ; } else { return new Range ( minimum , maximum ) ; } }
returns the range of values the renderer requires to display all the items from the specified dataset .
