org.jfree.data.statistics.HistogramBin Java Examples

/**
 * Returns the y-value for a bin (calculated to take into account the histogram type).
 *
 * @param series the series index (in the range <code>0</code> to
 *        <code>getSeriesCount() - 1</code>).
 * @param item the item index (zero based).
 *
 * @return The y-value.
 *
 * @throws IndexOutOfBoundsException if <code>series</code> is outside the specified range.
 */
@Override
public Number getY(int series, int item) {
  List<?> bins = getBins(series);
  HistogramBin bin = (HistogramBin) bins.get(item);
  double total = getTotal(series);
  double binWidth = getBinWidth(series);

  if (this.type == HistogramType.FREQUENCY) {
    return new Double(bin.getCount());
  } else if (this.type == HistogramType.RELATIVE_FREQUENCY) {
    return new Double(bin.getCount() / total);
  } else if (this.type == HistogramType.SCALE_AREA_TO_1) {
    return new Double(bin.getCount() / (binWidth * total));
  } else { // pretty sure this shouldn't ever happen
    throw new IllegalStateException();
  }
}
 

/**
 * Returns the y-value for a bin (calculated to take into account the histogram type).
 * 
 * @param series the series index (in the range <code>0</code> to
 *        <code>getSeriesCount() - 1</code>).
 * @param item the item index (zero based).
 * 
 * @return The y-value.
 * 
 * @throws IndexOutOfBoundsException if <code>series</code> is outside the specified range.
 */
public Number getY(int series, int item) {
  List<?> bins = getBins(series);
  HistogramBin bin = (HistogramBin) bins.get(item);
  double total = getTotal(series);
  double binWidth = getBinWidth(series);

  if (this.type == HistogramType.FREQUENCY) {
    return new Double(bin.getCount());
  } else if (this.type == HistogramType.RELATIVE_FREQUENCY) {
    return new Double(bin.getCount() / total);
  } else if (this.type == HistogramType.SCALE_AREA_TO_1) {
    return new Double(bin.getCount() / (binWidth * total));
  } else { // pretty sure this shouldn't ever happen
    throw new IllegalStateException();
  }
}
 

/**
 * Confirm that the equals method can distinguish all the required fields.
 */
public void testEquals() {

    double start = 10.0;
    double end = 20.0;
    HistogramBin b1 = new HistogramBin(start, end);
    HistogramBin b2 = new HistogramBin(start, end);

    assertTrue(b1.equals(b2));
    assertTrue(b2.equals(b1));

}
 

/**
 * Confirm that the equals method can distinguish all the required fields.
 */
public void testEquals() {
    
    double start = 10.0;
    double end = 20.0;
    HistogramBin b1 = new HistogramBin(start, end);
    HistogramBin b2 = new HistogramBin(start, end);
    
    assertTrue(b1.equals(b2));
    assertTrue(b2.equals(b1));

}
 

/**
 * Returns the X value for a bin. This value won't be used for plotting histograms, since the
 * renderer will ignore it. But other renderers can use it (for example, you could use the dataset
 * to create a line chart).
 *
 * @param series the series index (in the range <code>0</code> to
 *        <code>getSeriesCount() - 1</code>).
 * @param item the item index (zero based).
 *
 * @return The start value.
 *
 * @throws IndexOutOfBoundsException if <code>series</code> is outside the specified range.
 */
@Override
public Number getX(int series, int item) {
  List<?> bins = getBins(series);
  HistogramBin bin = (HistogramBin) bins.get(item);
  double x = (bin.getStartBoundary() + bin.getEndBoundary()) / 2.;
  return new Double(x);
}
 

/**
 * Returns the start value for a bin.
 *
 * @param series the series index (in the range <code>0</code> to
 *        <code>getSeriesCount() - 1</code>).
 * @param item the item index (zero based).
 *
 * @return The start value.
 *
 * @throws IndexOutOfBoundsException if <code>series</code> is outside the specified range.
 */
@Override
public Number getStartX(int series, int item) {
  List<?> bins = getBins(series);
  HistogramBin bin = (HistogramBin) bins.get(item);
  return new Double(bin.getStartBoundary());
}
 

/**
 * Returns the end value for a bin.
 *
 * @param series the series index (in the range <code>0</code> to
 *        <code>getSeriesCount() - 1</code>).
 * @param item the item index (zero based).
 *
 * @return The end value.
 *
 * @throws IndexOutOfBoundsException if <code>series</code> is outside the specified range.
 */
@Override
public Number getEndX(int series, int item) {
  List<?> bins = getBins(series);
  HistogramBin bin = (HistogramBin) bins.get(item);
  return new Double(bin.getEndBoundary());
}
 

/**
 * Returns the X value for a bin. This value won't be used for plotting histograms, since the
 * renderer will ignore it. But other renderers can use it (for example, you could use the dataset
 * to create a line chart).
 * 
 * @param series the series index (in the range <code>0</code> to
 *        <code>getSeriesCount() - 1</code>).
 * @param item the item index (zero based).
 * 
 * @return The start value.
 * 
 * @throws IndexOutOfBoundsException if <code>series</code> is outside the specified range.
 */
public Number getX(int series, int item) {
  List<?> bins = getBins(series);
  HistogramBin bin = (HistogramBin) bins.get(item);
  double x = (bin.getStartBoundary() + bin.getEndBoundary()) / 2.;
  return new Double(x);
}
 

/**
 * Returns the start value for a bin.
 * 
 * @param series the series index (in the range <code>0</code> to
 *        <code>getSeriesCount() - 1</code>).
 * @param item the item index (zero based).
 * 
 * @return The start value.
 * 
 * @throws IndexOutOfBoundsException if <code>series</code> is outside the specified range.
 */
public Number getStartX(int series, int item) {
  List<?> bins = getBins(series);
  HistogramBin bin = (HistogramBin) bins.get(item);
  return new Double(bin.getStartBoundary());
}
 

/**
 * Returns the end value for a bin.
 * 
 * @param series the series index (in the range <code>0</code> to
 *        <code>getSeriesCount() - 1</code>).
 * @param item the item index (zero based).
 * 
 * @return The end value.
 * 
 * @throws IndexOutOfBoundsException if <code>series</code> is outside the specified range.
 */
public Number getEndX(int series, int item) {
  List<?> bins = getBins(series);
  HistogramBin bin = (HistogramBin) bins.get(item);
  return new Double(bin.getEndBoundary());
}