Source Code Cross Referenced for AbstractPieLabelDistributor.java in  » Chart » jfreechart » org » jfree » chart » plot » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Chart » jfreechart » org.jfree.chart.plot 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* ===========================================================
002:         * JFreeChart : a free chart library for the Java(tm) platform
003:         * ===========================================================
004:         *
005:         * (C) Copyright 2000-2007, by Object Refinery Limited and Contributors.
006:         *
007:         * Project Info:  http://www.jfree.org/jfreechart/index.html
008:         *
009:         * This library is free software; you can redistribute it and/or modify it 
010:         * under the terms of the GNU Lesser General Public License as published by 
011:         * the Free Software Foundation; either version 2.1 of the License, or 
012:         * (at your option) any later version.
013:         *
014:         * This library is distributed in the hope that it will be useful, but 
015:         * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
016:         * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 
017:         * License for more details.
018:         *
019:         * You should have received a copy of the GNU Lesser General Public
020:         * License along with this library; if not, write to the Free Software
021:         * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
022:         * USA.  
023:         *
024:         * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
025:         * in the United States and other countries.]
026:         *
027:         * --------------------------------
028:         * AbstractPieLabelDistributor.java
029:         * --------------------------------
030:         * (C) Copyright 2007, by Object Refinery Limited and Contributors.
031:         *
032:         * Original Author:  David Gilbert (for Object Refinery Limited);
033:         * Contributor(s):   -;
034:         *
035:         * $Id: AbstractPieLabelDistributor.java,v 1.1.2.1 2007/06/14 15:04:21 mungady Exp $
036:         *
037:         * Changes
038:         * -------
039:         * 14-Jun-2007 : Version 1 (DG);
040:         *
041:         */
042:
043:        package org.jfree.chart.plot;
044:
045:        import java.io.Serializable;
046:        import java.util.List;
047:
048:        /**
049:         * A base class for handling the distribution of pie section labels.  Create
050:         * your own subclass and set it using the 
051:         * {@link PiePlot#setLabelDistributor(AbstractPieLabelDistributor)} method
052:         * if you want to customise the label distribution.
053:         */
054:        public abstract class AbstractPieLabelDistributor implements 
055:                Serializable {
056:
057:            /** The label records. */
058:            protected List labels;
059:
060:            /**
061:             * Creates a new instance.
062:             */
063:            public AbstractPieLabelDistributor() {
064:                this .labels = new java.util.ArrayList();
065:            }
066:
067:            /**
068:             * Returns a label record from the list.
069:             * 
070:             * @param index  the index.
071:             * 
072:             * @return The label record.
073:             */
074:            public PieLabelRecord getPieLabelRecord(int index) {
075:                return (PieLabelRecord) this .labels.get(index);
076:            }
077:
078:            /**
079:             * Adds a label record.
080:             * 
081:             * @param record  the label record (<code>null</code> not permitted).
082:             */
083:            public void addPieLabelRecord(PieLabelRecord record) {
084:                if (record == null) {
085:                    throw new IllegalArgumentException(
086:                            "Null 'record' argument.");
087:                }
088:                this .labels.add(record);
089:            }
090:
091:            /**
092:             * Returns the number of items in the list.
093:             * 
094:             * @return The item count.
095:             */
096:            public int getItemCount() {
097:                return this .labels.size();
098:            }
099:
100:            /**
101:             * Clears the list of labels.
102:             */
103:            public void clear() {
104:                this .labels.clear();
105:            }
106:
107:            /**
108:             * Called by the {@link PiePlot} class.  Implementations should distribute
109:             * the labels in this.labels then return.
110:             * 
111:             * @param minY  the y-coordinate for the top of the label area.
112:             * @param height  the height of the label area.
113:             */
114:            public abstract void distributeLabels(double minY, double height);
115:
116:        }
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