import org.swtchart.Chart; //导入依赖的package包/类
private void putOnAxis(final Chart chart, final ILineSeries newSeries,
    final Unit<?> newUnits)
{
  final String unitStr = newUnits.toString();

  // special case. at start we just have an empty y axis
  final IAxis[] yAxes = chart.getAxisSet().getYAxes();
  if (yAxes.length == 1 && yAxes[0].getTitle().getText() == "")
  {
    // ok, we're only just opened. Use this one
    yAxes[0].getTitle().setText(unitStr);
    newSeries.setYAxisId(yAxes[0].getId());
  }
  else
  {
    int leftCount = 0;
    int rightCount = 0;

    // clear the axis id, we're going to rely on it
    final int INVALID_ID = -10000;
    newSeries.setYAxisId(INVALID_ID);

    // ok, work through the axes
    for (final IAxis t : yAxes)
    {
      if (t.getTitle().getText().equals(unitStr))
      {
        // ok, this will do
        newSeries.setYAxisId(t.getId());
      }
      else
      {
        // just keep track of the count
        switch (t.getPosition())
        {
        case Primary:
          leftCount++;
          break;
        case Secondary:
        default:
          rightCount++;
          break;
        }
      }
    }

    // did we store it?
    if (newSeries.getYAxisId() == INVALID_ID)
    {
      final Position toUse;
      // choose the side with the fewest, or the x if none.
      if (leftCount == 0)
      {
        toUse = Position.Primary;
      }
      else if (leftCount > rightCount)
      {
        toUse = Position.Secondary;
      }
      else
      {
        toUse = Position.Primary;
      }

      // create the axis
      final int newAxisId = chart.getAxisSet().createYAxis();
      final IAxis newAxis = chart.getAxisSet().getYAxis(newAxisId);
      newAxis.getTitle().setText(unitStr);
      newAxis.setPosition(toUse);

      // and tell the series to use it
      newSeries.setYAxisId(newAxisId);
    }
  }
}