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JFreeChart is a class library, written in Java, for generating charts. Utilising the Java2D APIs, it currently supports bar charts, pie charts, line charts, XY-plots and time series plots.

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/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2013, 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.]
 *
 * -------------
 * TickUnit.java
 * -------------
 * (C) Copyright 2001-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 19-Dec-2001 : Added standard header (DG);
 * 01-May-2002 : Changed the unit size from Number to double (DG);
 * 26-Sep-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);
 * 05-Sep-2005 : Implemented hashCode(), thanks to Thomas Morgner (DG);
 * 02-Aug-2007 : Added minorTickCount attribute (DG);
 *
 */

package org.jfree.chart.axis;

import java.io.Serializable;

/**
 * Base class representing a tick unit.  This determines the spacing of the
 * tick marks on an axis.
 * 

* This class (and any subclasses) should be immutable, the reason being that * ORDERED collections of tick units are maintained and if one instance can be * changed, it may destroy the order of the collection that it belongs to. * In addition, if the implementations are immutable, they can belong to * multiple collections. * * @see ValueAxis */ public abstract class TickUnit implements Comparable, Serializable { /** For serialization. */ private static final long serialVersionUID = 510179855057013974L; /** The size of the tick unit. */ private double size; /** * The number of minor ticks. * * @since 1.0.7 */ private int minorTickCount; /** * Constructs a new tick unit. * * @param size the tick unit size. */ public TickUnit(double size) { this.size = size; } /** * Constructs a new tick unit. * * @param size the tick unit size. * @param minorTickCount the minor tick count. * * @since 1.0.7 */ public TickUnit(double size, int minorTickCount) { this.size = size; this.minorTickCount = minorTickCount; } /** * Returns the size of the tick unit. * * @return The size of the tick unit. */ public double getSize() { return this.size; } /** * Returns the minor tick count. * * @return The minor tick count. * * @since 1.0.7 */ public int getMinorTickCount() { return this.minorTickCount; } /** * Converts the supplied value to a string. *

* Subclasses may implement special formatting by overriding this method. * * @param value the data value. * * @return Value as string. */ public String valueToString(double value) { return String.valueOf(value); } /** * Compares this tick unit to an arbitrary object. * * @param object the object to compare against. * * @return 1 if the size of the other object is less than this, * 0 if both have the same size and -1 this * size is less than the others. */ @Override public int compareTo(Object object) { if (object instanceof TickUnit) { TickUnit other = (TickUnit) object; if (this.size > other.getSize()) { return 1; } else if (this.size < other.getSize()) { return -1; } else { return 0; } } else { return -1; } } /** * Tests this unit for equality with another object. * * @param obj the object. * * @return true or false. */ @Override public boolean equals(Object obj) { if (obj == this) { return true; } if (!(obj instanceof TickUnit)) { return false; } TickUnit that = (TickUnit) obj; if (this.size != that.size) { return false; } if (this.minorTickCount != that.minorTickCount) { return false; } return true; } /** * Returns a hash code for this instance. * * @return A hash code. */ @Override public int hashCode() { long temp = this.size != +0.0d ? Double.doubleToLongBits(this.size) : 0L; return (int) (temp ^ (temp >>> 32)); } }





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