org.jfree.chart.labels.StandardPieSectionLabelGenerator Maven / Gradle / Ivy
Show all versions of jfreechart Show documentation
/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2020, by Object Refinery Limited and Contributors.
*
* Project Info: http://www.jfree.org/jfreechart/index.html
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*
* [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
* Other names may be trademarks of their respective owners.]
*
* -------------------------------------
* StandardPieSectionLabelGenerator.java
* -------------------------------------
* (C) Copyright 2004-2020, by Object Refinery Limited.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): -;
*
*/
package org.jfree.chart.labels;
import java.awt.Font;
import java.awt.Paint;
import java.awt.font.TextAttribute;
import java.io.Serializable;
import java.text.AttributedString;
import java.text.NumberFormat;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import org.jfree.chart.util.PublicCloneable;
import org.jfree.data.general.PieDataset;
/**
* A standard item label generator for plots that use data from a
* {@link PieDataset}.
*
* For the label format, use {0} where the pie section key should be inserted,
* {1} for the absolute section value and {2} for the percent amount of the pie
* section, e.g. {@code "{0} = {1} ({2})"} will display as
* {@code apple = 120 (5%)}.
*/
public class StandardPieSectionLabelGenerator
extends AbstractPieItemLabelGenerator
implements PieSectionLabelGenerator, Cloneable, PublicCloneable,
Serializable {
/** For serialization. */
private static final long serialVersionUID = 3064190563760203668L;
/** The default section label format. */
public static final String DEFAULT_SECTION_LABEL_FORMAT = "{0}";
/**
* An optional map between item indices (Integer) and attributed labels
* (instances of AttributedString).
*/
private Map attributedLabels;
/**
* Creates a new section label generator using
* {@link #DEFAULT_SECTION_LABEL_FORMAT} as the label format string, and
* platform default number and percentage formatters.
*/
public StandardPieSectionLabelGenerator() {
this(DEFAULT_SECTION_LABEL_FORMAT, NumberFormat.getNumberInstance(),
NumberFormat.getPercentInstance());
}
/**
* Creates a new instance for the specified locale.
*
* @param locale the local ({@code null} not permitted).
*
* @since 1.0.7
*/
public StandardPieSectionLabelGenerator(Locale locale) {
this(DEFAULT_SECTION_LABEL_FORMAT, locale);
}
/**
* Creates a new section label generator using the specified label format
* string, and platform default number and percentage formatters.
*
* @param labelFormat the label format ({@code null} not permitted).
*/
public StandardPieSectionLabelGenerator(String labelFormat) {
this(labelFormat, NumberFormat.getNumberInstance(),
NumberFormat.getPercentInstance());
}
/**
* Creates a new instance for the specified locale.
*
* @param labelFormat the label format ({@code null} not permitted).
* @param locale the local ({@code null} not permitted).
*
* @since 1.0.7
*/
public StandardPieSectionLabelGenerator(String labelFormat, Locale locale) {
this(labelFormat, NumberFormat.getNumberInstance(locale),
NumberFormat.getPercentInstance(locale));
}
/**
* Creates an item label generator using the specified number formatters.
*
* @param labelFormat the label format string ({@code null} not
* permitted).
* @param numberFormat the format object for the values ({@code null}
* not permitted).
* @param percentFormat the format object for the percentages
* ({@code null} not permitted).
*/
public StandardPieSectionLabelGenerator(String labelFormat,
NumberFormat numberFormat, NumberFormat percentFormat) {
super(labelFormat, numberFormat, percentFormat);
this.attributedLabels = new HashMap();
}
/**
* Returns the attributed label for a section, or {@code null} if none
* is defined.
*
* @param section the section index.
*
* @return The attributed label.
*/
public AttributedString getAttributedLabel(int section) {
return (AttributedString) this.attributedLabels.get(section);
}
/**
* Sets the attributed label for a section.
*
* @param section the section index.
* @param label the label ({@code null} permitted).
*/
public void setAttributedLabel(int section, AttributedString label) {
this.attributedLabels.put(section, label);
}
/**
* Generates a label for a pie section.
*
* @param dataset the dataset ({@code null} not permitted).
* @param key the section key ({@code null} not permitted).
*
* @return The label (possibly {@code null}).
*/
@Override
public String generateSectionLabel(PieDataset dataset, Comparable key) {
return super.generateSectionLabel(dataset, key);
}
/**
* Generates an attributed label for the specified series, or
* {@code null} if no attributed label is available (in which case,
* the string returned by
* {@link #generateSectionLabel(PieDataset, Comparable)} will
* provide the fallback). Only certain attributes are recognised by the
* code that ultimately displays the labels:
*
* - {@link TextAttribute#FONT}: will set the font;
* - {@link TextAttribute#POSTURE}: a value of
* {@link TextAttribute#POSTURE_OBLIQUE} will add {@link Font#ITALIC} to
* the current font;
* - {@link TextAttribute#WEIGHT}: a value of
* {@link TextAttribute#WEIGHT_BOLD} will add {@link Font#BOLD} to the
* current font;
* - {@link TextAttribute#FOREGROUND}: this will set the {@link Paint}
* for the current
* - {@link TextAttribute#SUPERSCRIPT}: the values
* {@link TextAttribute#SUPERSCRIPT_SUB} and
* {@link TextAttribute#SUPERSCRIPT_SUPER} are recognised.
*
*
* @param dataset the dataset ({@code null} not permitted).
* @param key the key.
*
* @return An attributed label (possibly {@code null}).
*/
@Override
public AttributedString generateAttributedSectionLabel(PieDataset dataset,
Comparable key) {
return getAttributedLabel(dataset.getIndex(key));
}
/**
* Tests the generator for equality with an arbitrary object.
*
* @param obj the object to test against ({@code null} permitted).
*
* @return A boolean.
*/
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof StandardPieSectionLabelGenerator)) {
return false;
}
StandardPieSectionLabelGenerator that
= (StandardPieSectionLabelGenerator) obj;
if (!this.attributedLabels.equals(that.attributedLabels)) {
return false;
}
return super.equals(obj);
}
/**
* Returns an independent copy of the generator.
*
* @return A clone.
*
* @throws CloneNotSupportedException should not happen.
*/
@Override
public Object clone() throws CloneNotSupportedException {
StandardPieSectionLabelGenerator clone
= (StandardPieSectionLabelGenerator) super.clone();
clone.attributedLabels = new HashMap();
clone.attributedLabels.putAll(this.attributedLabels);
return clone;
}
}