valueaxis.java

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/* ===========================================================
 * 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.]
 *
 * --------------
 * ValueAxis.java
 * --------------
 * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   Jonathan Nash;
 *                   Nicolas Brodu (for Astrium and EADS Corporate Research 
 *                   Center);
 *
 * $Id: ValueAxis.java,v 1.10 2005/05/19 13:58:11 mungady Exp $
 *
 * Changes (from 18-Sep-2001)
 * --------------------------
 * 18-Sep-2001 : Added standard header and fixed DOS encoding problem (DG);
 * 23-Nov-2001 : Overhauled standard tick unit code (DG);
 * 04-Dec-2001 : Changed constructors to protected, and tidied up default 
 *               values (DG);
 * 12-Dec-2001 : Fixed vertical gridlines bug (DG);
 * 16-Jan-2002 : Added an optional crosshair, based on the implementation by 
 *               Jonathan Nash (DG);
 * 23-Jan-2002 : Moved the minimum and maximum values to here from NumberAxis, 
 *               and changed the type from Number to double (DG);
 * 25-Feb-2002 : Added default value for autoRange. Changed autoAdjustRange 
 *               from public to protected. Updated import statements (DG);
 * 23-Apr-2002 : Added setRange() method (DG);
 * 29-Apr-2002 : Added range adjustment methods (DG);
 * 13-Jun-2002 : Modified setCrosshairValue() to notify listeners only when the
 *               crosshairs are visible, to avoid unnecessary repaints, as 
 *               suggested by Kees Kuip (DG);
 * 25-Jul-2002 : Moved lower and upper margin attributes from the NumberAxis 
 *               class (DG);
 * 05-Sep-2002 : Updated constructor for changes in Axis class (DG);
 * 01-Oct-2002 : Fixed errors reported by Checkstyle (DG);
 * 04-Oct-2002 : Moved standardTickUnits from NumberAxis --> ValueAxis (DG);
 * 08-Nov-2002 : Moved to new package com.jrefinery.chart.axis (DG);
 * 19-Nov-2002 : Removed grid settings (now controlled by the plot) (DG);
 * 27-Nov-2002 : Moved the 'inverted' attributed from NumberAxis to 
 *               ValueAxis (DG);
 * 03-Jan-2003 : Small fix to ensure auto-range minimum is observed 
 *               immediately (DG);
 * 14-Jan-2003 : Changed autoRangeMinimumSize from Number --> double (DG);
 * 20-Jan-2003 : Replaced monolithic constructor (DG);
 * 26-Mar-2003 : Implemented Serializable (DG);
 * 09-May-2003 : Added AxisLocation parameter to translation methods (DG);
 * 13-Aug-2003 : Implemented Cloneable (DG);
 * 01-Sep-2003 : Fixed bug 793167 (setMaximumAxisValue exception) (DG);
 * 02-Sep-2003 : Fixed bug 795366 (zooming on inverted axes) (DG);
 * 08-Sep-2003 : Completed Serialization support (NB);
 * 08-Sep-2003 : Renamed get/setMinimumValue --> get/setLowerBound,
 *               and get/setMaximumValue --> get/setUpperBound (DG);
 * 27-Oct-2003 : Changed DEFAULT_AUTO_RANGE_MINIMUM_SIZE value - see bug ID 
 *               829606 (DG);
 * 07-Nov-2003 : Changes to tick mechanism (DG);
 * 06-Jan-2004 : Moved axis line attributes to Axis class (DG);
 * 21-Jan-2004 : Removed redundant axisLineVisible attribute.  Renamed 
 *               translateJava2DToValue --> java2DToValue, and 
 *               translateValueToJava2D --> valueToJava2D (DG); 
 * 23-Jan-2004 : Fixed setAxisLinePaint() and setAxisLineStroke() which had no 
 *               effect ([e-mail]);
 * 07-Apr-2004 : Changed text bounds calculation (DG);
 * 26-Apr-2004 : Added getter/setter methods for arrow shapes (DG);
 * 18-May-2004 : Added methods to set axis range *including* current 
 *               margins (DG);
 * 02-Jun-2004 : Fixed bug in setRangeWithMargins() method (DG);
 * 30-Sep-2004 : Moved drawRotatedString() from RefineryUtilities 
 *               --> TextUtilities (DG);
 * 11-Jan-2005 : Removed deprecated methods in preparation for 1.0.0 
 *               release (DG);
 * 21-Apr-2005 : Replaced Insets with RectangleInsets (DG);
 *
 */

package org.jfree.chart.axis;

import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics2D;
import java.awt.Polygon;
import java.awt.Shape;
import java.awt.font.LineMetrics;
import java.awt.geom.AffineTransform;
import java.awt.geom.Line2D;
import java.awt.geom.Rectangle2D;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.Iterator;
import java.util.List;

import org.jfree.chart.event.AxisChangeEvent;
import org.jfree.chart.plot.Plot;
import org.jfree.data.Range;
import org.jfree.io.SerialUtilities;
import org.jfree.text.TextUtilities;
import org.jfree.ui.RectangleEdge;
import org.jfree.ui.RectangleInsets;
import org.jfree.util.ObjectUtilities;
import org.jfree.util.PublicCloneable;

/**
 * The base class for axes that display value data, where values are measured 
 * using the <code>double</code> primitive.  The two key subclasses are 
 * {@link DateAxis} and {@link NumberAxis}.
 */
public abstract class ValueAxis extends Axis 
                                implements Cloneable, PublicCloneable, 
                                           Serializable {

    /** For serialization. */
    private static final long serialVersionUID = 3698345477322391456L;
    
    /** The default axis range. */
    public static final Range DEFAULT_RANGE = new Range(0.0, 1.0);

    /** The default auto-range value. */
    public static final boolean DEFAULT_AUTO_RANGE = true;

    /** The default inverted flag setting. */
    public static final boolean DEFAULT_INVERTED = false;

    /** The default minimum auto range. */
    public static final double DEFAULT_AUTO_RANGE_MINIMUM_SIZE = 0.00000001;

    /** The default value for the lower margin (0.05 = 5%). */
    public static final double DEFAULT_LOWER_MARGIN = 0.05;

    /** The default value for the upper margin (0.05 = 5%). */
    public static final double DEFAULT_UPPER_MARGIN = 0.05;

    /** The default lower bound for the axis. */
    public static final double DEFAULT_LOWER_BOUND = 0.0;

    /** The default upper bound for the axis. */
    public static final double DEFAULT_UPPER_BOUND = 1.0;

    /** The default auto-tick-unit-selection value. */
    public static final boolean DEFAULT_AUTO_TICK_UNIT_SELECTION = true;

    /** The maximum tick count. */
    public static final int MAXIMUM_TICK_COUNT = 500;
    
    /** 
     * A flag that controls whether an arrow is drawn at the positive end of 
     * the axis line. 
     */
    private boolean positiveArrowVisible;
    
    /** 
     * A flag that controls whether an arrow is drawn at the negative end of 
     * the axis line. 
     */
    private boolean negativeArrowVisible;
    
    /** The shape used for an up arrow. */
    private transient Shape upArrow;
    
    /** The shape used for a down arrow. */
    private transient Shape downArrow;
    
    /** The shape used for a left arrow. */
    private transient Shape leftArrow;
    
    /** The shape used for a right arrow. */
    private transient Shape rightArrow;
    
    /** A flag that affects the orientation of the values on the axis. */
    private boolean inverted;

    /** The axis range. */
    private Range range;

    /** 
     * Flag that indicates whether the axis automatically scales to fit the 
     * chart data. 
     */
    private boolean autoRange;

    /** The minimum size for the 'auto' axis range (excluding margins). */
    private double autoRangeMinimumSize;

    /**
     * The upper margin percentage.  This indicates the amount by which the 
     * maximum axis value exceeds the maximum data value (as a percentage of 
     * the range on the axis) when the axis range is determined automatically.
     */
    private double upperMargin;

    /**
     * The lower margin.  This is a percentage that indicates the amount by
     * which the minimum axis value is "less than" the minimum data value when
     * the axis range is determined automatically.
     */
    private double lowerMargin;

    /**
     * If this value is positive, the amount is subtracted from the maximum
     * data value to determine the lower axis range.  This can be used to
     * provide a fixed "window" on dynamic data.
     */
    private double fixedAutoRange;

    /** 
     * Flag that indicates whether or not the tick unit is selected 
     * automatically. 
     */
    private boolean autoTickUnitSelection;

    /** The standard tick units for the axis. */
    private TickUnitSource standardTickUnits;

    /** An index into an array of standard tick values. */
    private int autoTickIndex;
    
    /** A flag indicating whether or not tick labels are rotated to vertical. */
    private boolean verticalTickLabels;

    /**
     * Constructs a value axis.
     *
     * @param label  the axis label.
     * @param standardTickUnits  the source for standard tick units 
     *                           (<code>null</code> permitted).
     */
    protected ValueAxis(String label, TickUnitSource standardTickUnits) {

        super(label);

        this.positiveArrowVisible = false;
        this.negativeArrowVisible = false;

        this.range = DEFAULT_RANGE;
        this.autoRange = DEFAULT_AUTO_RANGE;

        this.inverted = DEFAULT_INVERTED;
        this.autoRangeMinimumSize = DEFAULT_AUTO_RANGE_MINIMUM_SIZE;

        this.lowerMargin = DEFAULT_LOWER_MARGIN;
        this.upperMargin = DEFAULT_UPPER_MARGIN;

        this.fixedAutoRange = 0.0;

        this.autoTickUnitSelection = DEFAULT_AUTO_TICK_UNIT_SELECTION;
        this.standardTickUnits = standardTickUnits;
        
        Polygon p1 = new Polygon();
        p1.addPoint(0, 0);
        p1.addPoint(-2, 2);
        p1.addPoint(2, 2);
        
        this.upArrow = p1;

        Polygon p2 = new Polygon();
        p2.addPoint(0, 0);
        p2.addPoint(-2, -2);
        p2.addPoint(2, -2);

        this.downArrow = p2;

        Polygon p3 = new Polygon();
        p3.addPoint(0, 0);
        p3.addPoint(-2, -2);
        p3.addPoint(-2, 2);
        
        this.rightArrow = p3;

        Polygon p4 = new Polygon();
        p4.addPoint(0, 0);
        p4.addPoint(2, -2);
        p4.addPoint(2, 2);

        this.leftArrow = p4;
        
        this.verticalTickLabels = false;
        
    }

    /**
     * Returns <code>true</code> if the tick labels should be rotated (to 
     * vertical), and <code>false</code> otherwise.
     *
     * @return <code>true</code> or <code>false</code>.
     */
    public boolean isVerticalTickLabels() {
        return this.verticalTickLabels;
    }

    /**
     * Sets the flag that controls whether the tick labels are displayed 
     * vertically (that is, rotated 90 degrees from horizontal).  If the flag 
     * is changed, an {@link AxisChangeEvent} is sent to all registered 
     * listeners.
     *
     * @param flag  the flag.
     */
    public void setVerticalTickLabels(boolean flag) {
        if (this.verticalTickLabels != flag) {
            this.verticalTickLabels = flag;
            notifyListeners(new AxisChangeEvent(this));
        }
    }

    /**
     * Returns a flag that controls whether or not the axis line has an arrow 
     * drawn that points in the positive direction for the axis.
     * 
     * @return A boolean.
     */
    public boolean isPositiveArrowVisible() {
        return this.positiveArrowVisible;
    }
    
    /**
     * Sets a flag that controls whether or not the axis lines has an arrow 
     * drawn that points in the positive direction for the axis, and sends an 
     * {@link AxisChangeEvent} to all registered listeners.
     * 
     * @param visible  the flag.
     */
    public void setPositiveArrowVisible(boolean visible) {
        this.positiveArrowVisible = visible;
        notifyListeners(new AxisChangeEvent(this));
    }
    
    /**
     * Returns a flag that controls whether or not the axis line has an arrow 
     * drawn that points in the negative direction for the axis.
     * 
     * @return A boolean.
     */
    public boolean isNegativeArrowVisible() {
        return this.negativeArrowVisible;
    }
    
    /**
     * Sets a flag that controls whether or not the axis lines has an arrow 
     * drawn that points in the negative direction for the axis, and sends an 
     * {@link AxisChangeEvent} to all registered listeners.
     * 
     * @param visible  the flag.
     */
    public void setNegativeArrowVisible(boolean visible) {
        this.negativeArrowVisible = visible;
        notifyListeners(new AxisChangeEvent(this));
    }
    
    /**
     * Returns a shape that can be displayed as an arrow pointing upwards at 
     * the end of an axis line.
     * 
     * @return A shape (never <code>null</code>).
     */
    public Shape getUpArrow() {
        return this.upArrow;   
    }
    
    /**
     * Sets the shape that can be displayed as an arrow pointing upwards at 
     * the end of an axis line and sends an {@link AxisChangeEvent} to all 
     * registered listeners.
     * 
     * @param arrow  the arrow shape (<code>null</code> not permitted).
     */
    public void setUpArrow(Shape arrow) {
        if (arrow == null) {