How to use org.jfree.util

private XYPlot createPeriodCostPlot(TangoColorFactory tangoColorFactory, CheapTimeSolution solution) {
  XYSeries series = new XYSeries("Power price");
  for (PeriodPowerPrice periodPowerPrice : solution.getPeriodPowerPriceList()) {
    series.add((double) periodPowerPrice.getPowerPriceMicros() / 1000000.0, periodPowerPrice.getPeriod());
  }
  XYSeriesCollection seriesCollection = new XYSeriesCollection();
  seriesCollection.addSeries(series);
  XYItemRenderer renderer = new StandardXYItemRenderer(StandardXYItemRenderer.SHAPES);
  renderer.setSeriesPaint(0, TangoColorFactory.ORANGE_1);
  renderer.setSeriesShape(0, ShapeUtilities.createDiamond(2.0F));
  NumberAxis domainAxis = new NumberAxis("Power price");
  return new XYPlot(seriesCollection, domainAxis, null, renderer);
}

@Override
public Shape getItemShape(int seriesIndex, int itemIndex) {
  XYDataItem dataItem = seriesCollection.getSeries(seriesIndex).getDataItem(itemIndex);
  if (firstActivities.contains(dataItem)) {
    return ShapeUtilities.createUpTriangle(4.0f);
  }
  return ELLIPSE;
}

void drawCoordinate(
    Coordinate c,
    Graphics2D g2,
    int series,
    int item,
    Rectangle2D dataArea,
    XYPlot plot,
    ValueAxis domainAxis,
    ValueAxis rangeAxis) {
  double tx = domainAxis.valueToJava2D(c.x, dataArea, plot.getDomainAxisEdge());
  double ty = rangeAxis.valueToJava2D(c.y, dataArea, plot.getRangeAxisEdge());
  Shape shape = getItemShape(series, item);
  shape = ShapeUtilities.createTranslatedShape(shape, tx, ty);
  if (fillCoordinates) {
    g2.fill(shape);
  } else {
    g2.draw(shape);
  }
}

/**
 * Sets the model comments.
 * 
 * @param modelComments  the model comments.
 */
public void setModelComments(final Comments modelComments) {
  Log.debug ("Model: Comment set: " + modelComments);
  this.modelComments = modelComments;
}
 

/**
 * Creates a log context.
 * 
 * @param context  the label for the context.
 * 
 * @return A log context.
 */
public static LogContext createContext(final String context) {
  return getInstance().internalCreateContext(context);
}

/**
 * A convenience method for logging a 'warning' message.
 *
 * @param message the message.
 */
public static void warn(final Object message) {
  log(LogTarget.WARN, message);
}

/**
 * Checks, whether a given property is defined.
 *
 * @param name the name of the property
 * @return true, if the property is defined, false otherwise.
 */
public boolean isPropertySet (final String name)
{
 return this.parent.getConfigProperty(name) != null;
}

/**
 * Creates a new line break iterator.
 *
 * @param text the text to be broken up.
 */
public LineBreakIterator(final String text)
{
 setText(text);
}

/**
 * Sets the {@link Shape} for an item in the list.  The list is expanded
 * if necessary.
 *
 * @param index  the index (zero-based).
 * @param shape  the {@link Shape}.
 */
public void setShape(final int index, final Shape shape) {
  set(index, shape);
}

  /**
   * Makes this implementation the default instance.
   */
  public static void installDefaultLog () {
   Log.defineLog(defaultLogInstance);
  }
}

/**
 * Returns an enumeration of the configuration properties.
 *
 * @return An enumeration.
 */
public Enumeration getConfigProperties()
{
 return this.parent.getConfigProperties();
}

/**
 * Returns true, if the log level allows error messages to be
 * printed.
 *
 * @return true, if messages with an log level of ERROR are allowed.
 */
public boolean isErrorEnabled() {
  return Log.isErrorEnabled();
}

/**
 * A convenience method for logging an 'error' message.
 *
 * @param message the message.
 * @param e       the exception.
 */
public void error(final Object message, final Exception e) {
  log(LogTarget.ERROR, message, e);
}

/**
 * Returns the configuration property with the specified key.
 *
 * @param key the property key.
 * @return the property value.
 */
public String getConfigProperty(final String key)
{
 return getProperty(key);
}

/**
 * Returns the boolean value of a given configuration property. The boolean value true
 * is returned, if the contained string is equal to 'true'.
 *
 * @param name the name of the property
 * @return the boolean value of the property.
 */
public boolean getBoolProperty (final String name)
{
 return getBoolProperty(name, false);
}

/**
 * Sets a flag that controls whether or not a series is filled.
 *
 * @param series  the series index.
 * @param filled  the flag.
 */
public void setSeriesFilled(int series, boolean filled) {
  this.seriesFilled.setBoolean(series, BooleanUtilities.valueOf(filled));
}

/**
 * Returns the configuration properties.
 *
 * @return An enumeration of the configuration properties.
 */
public Enumeration getConfigProperties()
{
 return this.parserConfiguration.getConfigProperties();
}

/**
 * A convenience method for logging an 'error' message.
 *
 * @param message the message.
 */
public static void error(final Object message) {
  log(LogTarget.ERROR, message);
}

renderer.setSeriesShape(seriesIndex, ShapeUtilities.createDiamond(1.5F));
renderer.setSeriesVisibleInLegend(seriesIndex, false);
seriesIndex++;

Shape upTriangle = ShapeUtilities.createUpTriangle(3.0f);
item.setShape(upTriangle);
item.setOutlinePaint(Color.BLACK);