symbolictickunit.java

来自「JfreeChart 常用图表例子」· Java 代码 · 共 107 行

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2005, 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
 * in the United States and other countries.]
 *
 * ---------------------
 * SymbolicTickUnit.java
 * ---------------------
 * (C) Copyright 2002-2005, by Anthony Boulestreau.
 *
 * Original Author:  Anthony Boulestreau;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * $Id: SymbolicTickUnit.java,v 1.3 2005/05/19 13:58:11 mungady Exp $
 *
 * Changes
 * -------
 * 01-May-2002 : Version 1, creation of SymbolicTickUnit to work with 
 *               VerticalSymbolicAxis and HorizontalSymbolicAxis (AB);
 * 01-Oct-2002 : Fixed errors reported by Checkstyle (DG):
 * 08-Nov-2002 : Moved to new package com.jrefinery.chart.axis (DG);
 * 26-Mar-2003 : Implemented Serializable (DG);
 * 03-Dec-2003 : There is no need for using lists here; replaced by 
 *               String-array (TM);
 */

package org.jfree.chart.axis;

import java.io.Serializable;

/**
 * A symbolic tick unit.
 *
 * @author Anthony Boulestreau
 */
public class SymbolicTickUnit extends NumberTickUnit implements Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -4836679837074745805L;
    
    /** The list of symbolic value to display instead of the numeric values */
    private String[] symbolicValue;

    /**
     * Creates a new symbolic tick unit.
     *
     * @param size  the size of the tick unit.
     * @param sv  the list of symbolic value to display instead of the numeric 
     *            value.
     */
    public SymbolicTickUnit(double size, String[] sv) {
        super(size, null);
        this.symbolicValue = new String[sv.length];
        System.arraycopy(sv, 0, this.symbolicValue, 0, sv.length);
    }

    /**
     * Converts a value to a string, using the list of symbolic values.
     * ex: if the symbolic value list is ["up", "down"] then 0 is convert to
     * "up" and 1 to "down".
     *
     * @param value  value to convert.
     *
     * @return The symbolic value.
     */
    public String valueToString(double value) {

        if ((value < 0) || (value >= this.symbolicValue.length)) {
            throw new IllegalArgumentException (
                "The value " + value 
                + " does not have a corresponding symbolic value"
            );
        }
        return this.symbolicValue[(int) value];
    }

    /**
     * Returns the number of symbols in this unit.
     * 
     * @return The symbol count.
     */
    public int getSymbolCount() {
        return this.symbolicValue.length;
    }
    
}