meterplot.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.]
 *
 * --------------
 * MeterPlot.java
 * --------------
 * (C) Copyright 2000-2005, by Hari and Contributors.
 *
 * Original Author:  Hari ([e-mail]);
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *                   Bob Orchard;
 *                   Arnaud Lelievre;
 *                   Nicolas Brodu;
 *                   David Bastend;
 *
 * $Id: MeterPlot.java,v 1.13 2005/05/19 14:03:41 mungady Exp $
 *
 * Changes
 * -------
 * 01-Apr-2002 : Version 1, contributed by Hari (DG);
 * 23-Apr-2002 : Moved dataset from JFreeChart to Plot (DG);
 * 22-Aug-2002 : Added changes suggest by Bob Orchard, changed Color to Paint 
 *               for consistency, plus added Javadoc comments (DG);
 * 01-Oct-2002 : Fixed errors reported by Checkstyle (DG);
 * 23-Jan-2003 : Removed one constructor (DG);
 * 26-Mar-2003 : Implemented Serializable (DG);
 * 20-Aug-2003 : Changed dataset from MeterDataset --> ValueDataset, added 
 *               equals() method,
 * 08-Sep-2003 : Added internationalization via use of properties 
 *               resourceBundle (RFE 690236) (AL); 
 *               implemented Cloneable, and various other changes (DG);
 * 08-Sep-2003 : Added serialization methods (NB);
 * 11-Sep-2003 : Added cloning support (NB);
 * 16-Sep-2003 : Changed ChartRenderingInfo --> PlotRenderingInfo (DG);
 * 25-Sep-2003 : Fix useless cloning. Correct dataset listener registration in 
 *               constructor. (NB)
 * 29-Oct-2003 : Added workaround for font alignment in PDF output (DG);
 * 17-Jan-2004 : Changed to allow dialBackgroundPaint to be set to null - see 
 *               bug 823628 (DG);
 * 07-Apr-2004 : Changed string bounds calculation (DG);
 * 12-May-2004 : Added tickLabelFormat attribute - see RFE 949566.  Also 
 *               updated the equals() method (DG);
 * 02-Nov-2004 : Added sanity checks for range, and only draw the needle if the 
 *               value is contained within the overall range - see bug report 
 *               1056047 (DG);
 * 11-Jan-2005 : Removed deprecated code in preparation for the 1.0.0 
 *               release (DG);
 * 02-Feb-2005 : Added optional background paint for each region (DG);
 * 22-Mar-2005 : Removed 'normal', 'warning' and 'critical' regions and put in
 *               facility to define an arbitrary number of MeterIntervals,
 *               based on a contribution by David Bastend (DG);
 * 20-Apr-2005 : Small update for change to LegendItem constructors (DG);
 * 05-May-2005 : Updated draw() method parameters (DG);
 * 
 */

package org.jfree.chart.plot;

import java.awt.AlphaComposite;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Composite;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Polygon;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.geom.Arc2D;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Line2D;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.text.NumberFormat;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.ResourceBundle;

import org.jfree.chart.LegendItem;
import org.jfree.chart.LegendItemCollection;
import org.jfree.chart.event.PlotChangeEvent;
import org.jfree.data.Range;
import org.jfree.data.general.DatasetChangeEvent;
import org.jfree.data.general.ValueDataset;
import org.jfree.io.SerialUtilities;
import org.jfree.text.TextUtilities;
import org.jfree.ui.RectangleInsets;
import org.jfree.util.ObjectUtilities;

/**
 * A plot that displays a single value in the form of a needle on a dial.  
 * Defined ranges (for example, 'normal', 'warning' and 'critical') can be
 * highlighted on the dial.
 */
public class MeterPlot extends Plot implements Serializable, Cloneable {

    /** For serialization. */
    private static final long serialVersionUID = 2987472457734470962L;
    
    /** The default background paint. */
    static final Paint DEFAULT_DIAL_BACKGROUND_PAINT = Color.black;

    /** The default needle paint. */
    static final Paint DEFAULT_NEEDLE_PAINT = Color.green;

    /** The default value font. */
    static final Font DEFAULT_VALUE_FONT = new Font("SansSerif", Font.BOLD, 12);

    /** The default value paint. */
    static final Paint DEFAULT_VALUE_PAINT = Color.yellow;

    /** The default meter angle. */
    public static final int DEFAULT_METER_ANGLE = 270;

    /** The default border size. */
    public static final float DEFAULT_BORDER_SIZE = 3f;

    /** The default circle size. */
    public static final float DEFAULT_CIRCLE_SIZE = 10f;

    /** The default label font. */
    public static final Font DEFAULT_LABEL_FONT 
        = new Font("SansSerif", Font.BOLD, 10);

    /** The dataset (contains a single value). */
    private ValueDataset dataset;

    /** The dial shape (background shape). */
    private DialShape shape;

    /** The dial extent (measured in degrees). */
    private int meterAngle;
    
    /** The overall range of data values on the dial. */
    private Range range;
    
    /** The units displayed on the dial. */    
    private String units;
    
    /** The font for the value displayed in the center of the dial. */
    private Font valueFont;

    /** The paint for the value displayed in the center of the dial. */
    private transient Paint valuePaint;

    /** A flag that controls whether or not the border is drawn. */
    private boolean drawBorder;

    /** The outline paint. */
    private transient Paint dialOutlinePaint;

    /** The paint for the dial background. */
    private transient Paint dialBackgroundPaint;

    /** The paint for the needle. */
    private transient Paint needlePaint;

    /** A flag that controls whether or not the tick labels are visible. */
    private boolean tickLabelsVisible;

    /** The tick label font. */
    private Font tickLabelFont;

    /** The tick label format. */
    private NumberFormat tickLabelFormat;

    /** The resourceBundle for the localization. */
    protected static ResourceBundle localizationResources = 
        ResourceBundle.getBundle("org.jfree.chart.plot.LocalizationBundle");

    /** 
     * A (possibly empty) list of the {@link MeterInterval}s to be highlighted 
     * on the dial. 
     */
    private List intervals;

    /**
     * Creates a new plot with a default range of <code>0</code> to 
     * <code>100</code> and no value to display.
     */
    public MeterPlot() {
        this(null);   
    }
    
    /**
     * Creates a new plot that displays the value from the supplied dataset.
     *
     * @param dataset  the dataset (<code>null</code> permitted).
     */
    public MeterPlot(ValueDataset dataset) {
        super();
        this.shape = DialShape.CIRCLE;
        this.meterAngle = DEFAULT_METER_ANGLE;
        this.range = new Range(0.0, 100.0);
        this.units = "Units";
        this.needlePaint = MeterPlot.DEFAULT_NEEDLE_PAINT;
        this.tickLabelsVisible = true;
        this.tickLabelFont = MeterPlot.DEFAULT_LABEL_FONT;
        this.tickLabelFormat = NumberFormat.getInstance();
        this.valueFont = MeterPlot.DEFAULT_VALUE_FONT;
        this.valuePaint = MeterPlot.DEFAULT_VALUE_PAINT;
        this.dialBackgroundPaint = MeterPlot.DEFAULT_DIAL_BACKGROUND_PAINT;
        this.intervals = new java.util.ArrayList();
        setDataset(dataset);
    }

    /**
     * Returns the dial shape.  The default is {@link DialShape#CIRCLE}).
     * 
     * @return The dial shape (never <code>null</code>).
     */
    public DialShape getDialShape() {
        return this.shape;
    }
    
    /**
     * Sets the dial shape and sends a {@link PlotChangeEvent} to all 
     * registered listeners.
     * 
     * @param shape  the shape (<code>null</code> not permitted).
     */
    public void setDialShape(DialShape shape) {
        if (shape == null) {
            throw new IllegalArgumentException("Null 'shape' argument.");
        }
        this.shape = shape;
        notifyListeners(new PlotChangeEvent(this));
    }
    
    /**
     * Returns the meter angle in degrees.  This defines, in part, the shape
     * of the dial.  The default is 270 degrees.
     *
     * @return The meter angle (in degrees).
     */
    public int getMeterAngle() {
        return this.meterAngle;
    }

    /**
     * Sets the angle (in degrees) for the whole range of the dial and sends 
     * a {@link PlotChangeEvent} to all registered listeners.
     * 
     * @param angle  the angle (in degrees, in the range 1-360).
     */
    public void setMeterAngle(int angle) {
        if (angle < 1 || angle > 360) {
            throw new IllegalArgumentException(
                "Invalid 'angle' (" + angle + ")"
            );
        }
        this.meterAngle = angle;
        notifyListeners(new PlotChangeEvent(this));
    }

    /**
     * Returns the overall range for the dial.
     * 
     * @return The overall range (never <code>null</code>).
     */
    public Range getRange() {
        return this.range;    
    }
    
    /**
     * Sets the range for the dial and sends a {@link PlotChangeEvent} to all
     * registered listeners.
     * 
     * @param range  the range (<code>null</code> not permitted and zero-length
     *               ranges not permitted).
     */
    public void setRange(Range range) {
        if (range == null) {
            throw new IllegalArgumentException("Null 'range' argument.");
        }
        if (!(range.getLength() > 0.0)) {
            throw new IllegalArgumentException(
                "Range length must be positive."
            );
        }
        this.range = range;
        notifyListeners(new PlotChangeEvent(this));
    }

    /**
     * Returns a string describing the units for the dial.
     * 
     * @return The units (possibly <code>null</code>).
     */
    public String getUnits() {
        return this.units;
    }
    
    /**
     * Sets the units for the dial and sends a {@link PlotChangeEvent} to all
     * registered listeners.
     * 
     * @param units  the units (<code>null</code> permitted).
     */
    public void setUnits(String units) {
        this.units = units;    
        notifyListeners(new PlotChangeEvent(this));
    }
        
    /**
     * Returns the paint for the needle.
     *
     * @return The paint (never <code>null</code>).
     */
    public Paint getNeedlePaint() {
        return this.needlePaint;
    }

    /**
     * Sets the paint used to display the needle and sends a 
     * {@link PlotChangeEvent} to all registered listeners.
     *
     * @param paint  the paint (<code>null</code> not permitted).
     */
    public void setNeedlePaint(Paint paint) {
        if (paint == null) {
            throw new IllegalArgumentException("Null 'paint' argument.");
        }
        this.needlePaint = paint;
        notifyListeners(new PlotChangeEvent(this));
    }

    /**
     * Returns the flag that determines whether or not tick labels are visible.
     *
     * @return The flag.
     */
    public boolean getTickLabelsVisible() {
        return this.tickLabelsVisible;
    }

    /**
     * Sets the flag that controls whether or not the tick labels are visible
     * and sends a {@link PlotChangeEvent} to all registered listeners.
     *
     * @param visible  the flag.
     */
    public void setTickLabelsVisible(boolean visible) {
        if (this.tickLabelsVisible != visible) {
            this.tickLabelsVisible = visible;
            notifyListeners(new PlotChangeEvent(this));
        }
    }

    /**
     * Returns the tick label font.
     *
     * @return The font (never <code>null</code>).
     */
    public Font getTickLabelFont() {
        return this.tickLabelFont;
    }

    /**
     * Sets the tick label font and sends a {@link PlotChangeEvent} to all 
     * registered listeners.
     *
     * @param font  the font (<code>null</code> not permitted).
     */
    public void setTickLabelFont(Font font) {
        if (font == null) {
            throw new IllegalArgumentException("Null 'font' argument.");
        }
        if (!this.tickLabelFont.equals(font)) {
            this.tickLabelFont = font;