@Override public Range findRangeBounds(XYDataset dataset){
  if (dataset == null) {
    return null;
  }
  double min=Double.POSITIVE_INFINITY;
  double max=Double.NEGATIVE_INFINITY;
  TableXYDataset d=(TableXYDataset)dataset;
  int itemCount=d.getItemCount();
  for (int i=0; i < itemCount; i++) {
    double[] stackValues=getStackValues((TableXYDataset)dataset,d.getSeriesCount(),i);
    min=Math.min(min,stackValues[0]);
    max=Math.max(max,stackValues[1]);
  }
  if (min == Double.POSITIVE_INFINITY) {
    return null;
  }
  return new Range(min,max);
}

@ Override public Range findRangeBounds ( XYDataset dataset ) { if ( dataset == null ) { return null ; } double min = Double . POSITIVE_INFINITY ; double max = Double . NEGATIVE_INFINITY ; TableXYDataset d = ( TableXYDataset ) dataset ; int itemCount = d . getItemCount ( ) ; for ( int i = 0 ; i < itemCount ; i ++ ) { double [ ] stackValues = getStackValues ( ( TableXYDataset ) dataset , d . getSeriesCount ( ) , i ) ; min = Math . min ( min , stackValues [ 0 ] ) ; max = Math . max ( max , stackValues [ 1 ] ) ; } if ( min == Double . POSITIVE_INFINITY ) { return null ; } return new Range ( min , max ) ; }
returns the range of values the renderer requires to display all the items from the specified dataset .
