How to use

getArea

method

in

org.pentaho.di.core.gui.GCInterface

/**
 * Draws a metrics tab.
 *
 * @param durations
 *          is a list of metrics durations
 * @return list of drawing areas.Throw IllegalArgumentException in case if input parameter is null or an empty
 */
public List<MetricsDrawArea> paint( List<MetricsDuration> durations ) {
 if ( Utils.isEmpty( durations ) ) {
  throw new IllegalArgumentException();
 }
 int width = getGc().getArea().x - 4;
 int height = getGc().getArea().y - 4;
 List<MetricsDrawArea> areas = new ArrayList<MetricsDrawArea>();
 // First determine the period
 //
 determinePeriod( durations );
 if ( periodStart == null || periodEnd == null || periodEnd <= periodStart ) {
  return areas; // nothing to do;
 }
 double pixelsPerMs = (double) width / ( (double) ( periodEnd - periodStart ) );
 long periodInMs = periodEnd - periodStart;
 drawTimeScaleLine( height, pixelsPerMs, periodInMs );
 drawDurations( durations, areas, pixelsPerMs );
 return areas;
}