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jfreechart example source code file (DialValueIndicator.java)

This example jfreechart source code file (DialValueIndicator.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - jfreechart tags/keywords

awt, diallayerchangeevent, diallayerchangeevent, dialvalueindicator, dialvalueindicator, font, geometry, illegalargumentexception, illegalargumentexception, io, null, null, number, paint, rectangle2d, rectangleanchor, rectangleinsets, text

The jfreechart DialValueIndicator.java source code

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2008, 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.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
 * in the United States and other countries.]
 *
 * -----------------------
 * DialValueIndicator.java
 * -----------------------
 * (C) Copyright 2006-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 03-Nov-2006 : Version 1 (DG);
 * 17-Oct-2007 : Updated equals() (DG);
 * 24-Oct-2007 : Added default constructor and missing event notification (DG);
 *
 */

package org.jfree.chart.plot.dial;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Stroke;
import java.awt.geom.Arc2D;
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.DecimalFormat;
import java.text.NumberFormat;

import org.jfree.chart.HashUtilities;
import org.jfree.io.SerialUtilities;
import org.jfree.text.TextUtilities;
import org.jfree.ui.RectangleAnchor;
import org.jfree.ui.RectangleInsets;
import org.jfree.ui.Size2D;
import org.jfree.ui.TextAnchor;
import org.jfree.util.PaintUtilities;
import org.jfree.util.PublicCloneable;

/**
 * A value indicator for a {@link DialPlot}.
 *
 * @since 1.0.7
 */
public class DialValueIndicator extends AbstractDialLayer implements DialLayer,
        Cloneable, PublicCloneable, Serializable {

    /** For serialization. */
    static final long serialVersionUID = 803094354130942585L;

    /** The dataset index. */
    private int datasetIndex;

    /** The angle that defines the anchor point. */
    private double angle;

    /** The radius that defines the anchor point. */
    private double radius;

    /** The frame anchor. */
    private RectangleAnchor frameAnchor;

    /** The template value. */
    private Number templateValue;

    /** The formatter. */
    private NumberFormat formatter;

    /** The font. */
    private Font font;

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

    /** The background paint. */
    private transient Paint backgroundPaint;

    /** The outline stroke. */
    private transient Stroke outlineStroke;

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

    /** The insets. */
    private RectangleInsets insets;

    /** The value anchor. */
    private RectangleAnchor valueAnchor;

    /** The text anchor for displaying the value. */
    private TextAnchor textAnchor;

    /**
     * Creates a new instance of <code>DialValueIndicator.
     */
    public DialValueIndicator() {
        this(0);
    }

    /**
     * Creates a new instance of <code>DialValueIndicator.
     *
     * @param datasetIndex  the dataset index.
     */
    public DialValueIndicator(int datasetIndex) {
        this.datasetIndex = datasetIndex;
        this.angle = -90.0;
        this.radius = 0.3;
        this.frameAnchor = RectangleAnchor.CENTER;
        this.templateValue = new Double(100.0);
        this.formatter = new DecimalFormat("0.0");
        this.font = new Font("Dialog", Font.BOLD, 14);
        this.paint = Color.black;
        this.backgroundPaint = Color.white;
        this.outlineStroke = new BasicStroke(1.0f);
        this.outlinePaint = Color.blue;
        this.insets = new RectangleInsets(4, 4, 4, 4);
        this.valueAnchor = RectangleAnchor.RIGHT;
        this.textAnchor = TextAnchor.CENTER_RIGHT;
    }

    /**
     * Returns the index of the dataset from which this indicator fetches its
     * current value.
     *
     * @return The dataset index.
     *
     * @see #setDatasetIndex(int)
     */
    public int getDatasetIndex() {
        return this.datasetIndex;
    }

    /**
     * Sets the dataset index and sends a {@link DialLayerChangeEvent} to all
     * registered listeners.
     *
     * @param index  the index.
     *
     * @see #getDatasetIndex()
     */
    public void setDatasetIndex(int index) {
        this.datasetIndex = index;
        notifyListeners(new DialLayerChangeEvent(this));
    }

    /**
     * Returns the angle for the anchor point.  The angle is specified in
     * degrees using the same orientation as Java's <code>Arc2D class.
     *
     * @return The angle (in degrees).
     *
     * @see #setAngle(double)
     */
    public double getAngle() {
        return this.angle;
    }

    /**
     * Sets the angle for the anchor point and sends a
     * {@link DialLayerChangeEvent} to all registered listeners.
     *
     * @param angle  the angle (in degrees).
     *
     * @see #getAngle()
     */
    public void setAngle(double angle) {
        this.angle = angle;
        notifyListeners(new DialLayerChangeEvent(this));
    }

    /**
     * Returns the radius.
     *
     * @return The radius.
     *
     * @see #setRadius(double)
     */
    public double getRadius() {
        return this.radius;
    }

    /**
     * Sets the radius and sends a {@link DialLayerChangeEvent} to all
     * registered listeners.
     *
     * @param radius  the radius.
     *
     * @see #getRadius()
     */
    public void setRadius(double radius) {
        this.radius = radius;
        notifyListeners(new DialLayerChangeEvent(this));
    }

    /**
     * Returns the frame anchor.
     *
     * @return The frame anchor.
     *
     * @see #setFrameAnchor(RectangleAnchor)
     */
    public RectangleAnchor getFrameAnchor() {
        return this.frameAnchor;
    }

    /**
     * Sets the frame anchor and sends a {@link DialLayerChangeEvent} to all
     * registered listeners.
     *
     * @param anchor  the anchor (<code>null not permitted).
     *
     * @see #getFrameAnchor()
     */
    public void setFrameAnchor(RectangleAnchor anchor) {
        if (anchor == null) {
            throw new IllegalArgumentException("Null 'anchor' argument.");
        }
        this.frameAnchor = anchor;
        notifyListeners(new DialLayerChangeEvent(this));
    }

    /**
     * Returns the template value.
     *
     * @return The template value (never <code>null).
     *
     * @see #setTemplateValue(Number)
     */
    public Number getTemplateValue() {
        return this.templateValue;
    }

    /**
     * Sets the template value and sends a {@link DialLayerChangeEvent} to
     * all registered listeners.
     *
     * @param value  the value (<code>null not permitted).
     *
     * @see #setTemplateValue(Number)
     */
    public void setTemplateValue(Number value) {
        if (value == null) {
            throw new IllegalArgumentException("Null 'value' argument.");
        }
        this.templateValue = value;
        notifyListeners(new DialLayerChangeEvent(this));
    }

    /**
     * Returns the formatter used to format the value.
     *
     * @return The formatter (never <code>null).
     *
     * @see #setNumberFormat(NumberFormat)
     */
    public NumberFormat getNumberFormat() {
        return this.formatter;
    }

    /**
     * Sets the formatter used to format the value and sends a
     * {@link DialLayerChangeEvent} to all registered listeners.
     *
     * @param formatter  the formatter (<code>null not permitted).
     *
     * @see #getNumberFormat()
     */
    public void setNumberFormat(NumberFormat formatter) {
        if (formatter == null) {
            throw new IllegalArgumentException("Null 'formatter' argument.");
        }
        this.formatter = formatter;
        notifyListeners(new DialLayerChangeEvent(this));
    }

    /**
     * Returns the font.
     *
     * @return The font (never <code>null).
     *
     * @see #getFont()
     */
    public Font getFont() {
        return this.font;
    }

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

    /**
     * Returns the paint.
     *
     * @return The paint (never <code>null).
     *
     * @see #setPaint(Paint)
     */
    public Paint getPaint() {
        return this.paint;
    }

    /**
     * Sets the paint and sends a {@link DialLayerChangeEvent} to all
     * registered listeners.
     *
     * @param paint  the paint (<code>null not permitted).
     *
     * @see #getPaint()
     */
    public void setPaint(Paint paint) {
        if (paint == null) {
            throw new IllegalArgumentException("Null 'paint' argument.");
        }
        this.paint = paint;
        notifyListeners(new DialLayerChangeEvent(this));
    }

    /**
     * Returns the background paint.
     *
     * @return The background paint.
     *
     * @see #setBackgroundPaint(Paint)
     */
    public Paint getBackgroundPaint() {
        return this.backgroundPaint;
    }

    /**
     * Sets the background paint and sends a {@link DialLayerChangeEvent} to
     * all registered listeners.
     *
     * @param paint  the paint (<code>null not permitted).
     *
     * @see #getBackgroundPaint()
     */
    public void setBackgroundPaint(Paint paint) {
        if (paint == null) {
            throw new IllegalArgumentException("Null 'paint' argument.");
        }
        this.backgroundPaint = paint;
        notifyListeners(new DialLayerChangeEvent(this));
    }

    /**
     * Returns the outline stroke.
     *
     * @return The outline stroke (never <code>null).
     *
     * @see #setOutlineStroke(Stroke)
     */
    public Stroke getOutlineStroke() {
        return this.outlineStroke;
    }

    /**
     * Sets the outline stroke and sends a {@link DialLayerChangeEvent} to
     * all registered listeners.
     *
     * @param stroke  the stroke (<code>null not permitted).
     *
     * @see #getOutlineStroke()
     */
    public void setOutlineStroke(Stroke stroke) {
        if (stroke == null) {
            throw new IllegalArgumentException("Null 'stroke' argument.");
        }
        this.outlineStroke = stroke;
        notifyListeners(new DialLayerChangeEvent(this));
    }

    /**
     * Returns the outline paint.
     *
     * @return The outline paint (never <code>null).
     *
     * @see #setOutlinePaint(Paint)
     */
    public Paint getOutlinePaint() {
        return this.outlinePaint;
    }

    /**
     * Sets the outline paint and sends a {@link DialLayerChangeEvent} to all
     * registered listeners.
     *
     * @param paint  the paint (<code>null not permitted).
     *
     * @see #getOutlinePaint()
     */
    public void setOutlinePaint(Paint paint) {
        if (paint == null) {
            throw new IllegalArgumentException("Null 'paint' argument.");
        }
        this.outlinePaint = paint;
        notifyListeners(new DialLayerChangeEvent(this));
    }

    /**
     * Returns the insets.
     *
     * @return The insets (never <code>null).
     *
     * @see #setInsets(RectangleInsets)
     */
    public RectangleInsets getInsets() {
        return this.insets;
    }

    /**
     * Sets the insets and sends a {@link DialLayerChangeEvent} to all
     * registered listeners.
     *
     * @param insets  the insets (<code>null not permitted).
     *
     * @see #getInsets()
     */
    public void setInsets(RectangleInsets insets) {
        if (insets == null) {
            throw new IllegalArgumentException("Null 'insets' argument.");
        }
        this.insets = insets;
        notifyListeners(new DialLayerChangeEvent(this));
    }

    /**
     * Returns the value anchor.
     *
     * @return The value anchor (never <code>null).
     *
     * @see #setValueAnchor(RectangleAnchor)
     */
    public RectangleAnchor getValueAnchor() {
        return this.valueAnchor;
    }

    /**
     * Sets the value anchor and sends a {@link DialLayerChangeEvent} to all
     * registered listeners.
     *
     * @param anchor  the anchor (<code>null not permitted).
     *
     * @see #getValueAnchor()
     */
    public void setValueAnchor(RectangleAnchor anchor) {
        if (anchor == null) {
            throw new IllegalArgumentException("Null 'anchor' argument.");
        }
        this.valueAnchor = anchor;
        notifyListeners(new DialLayerChangeEvent(this));
    }

    /**
     * Returns the text anchor.
     *
     * @return The text anchor (never <code>null).
     *
     * @see #setTextAnchor(TextAnchor)
     */
    public TextAnchor getTextAnchor() {
        return this.textAnchor;
    }

    /**
     * Sets the text anchor and sends a {@link DialLayerChangeEvent} to all
     * registered listeners.
     *
     * @param anchor  the anchor (<code>null not permitted).
     *
     * @see #getTextAnchor()
     */
    public void setTextAnchor(TextAnchor anchor) {
        if (anchor == null) {
            throw new IllegalArgumentException("Null 'anchor' argument.");
        }
        this.textAnchor = anchor;
        notifyListeners(new DialLayerChangeEvent(this));
    }

    /**
     * Returns <code>true to indicate that this layer should be
     * clipped within the dial window.
     *
     * @return <code>true.
     */
    public boolean isClippedToWindow() {
        return true;
    }

    /**
     * Draws the background to the specified graphics device.  If the dial
     * frame specifies a window, the clipping region will already have been
     * set to this window before this method is called.
     *
     * @param g2  the graphics device (<code>null not permitted).
     * @param plot  the plot (ignored here).
     * @param frame  the dial frame (ignored here).
     * @param view  the view rectangle (<code>null not permitted).
     */
    public void draw(Graphics2D g2, DialPlot plot, Rectangle2D frame,
            Rectangle2D view) {

        // work out the anchor point
        Rectangle2D f = DialPlot.rectangleByRadius(frame, this.radius,
                this.radius);
        Arc2D arc = new Arc2D.Double(f, this.angle, 0.0, Arc2D.OPEN);
        Point2D pt = arc.getStartPoint();

        // calculate the bounds of the template value
        FontMetrics fm = g2.getFontMetrics(this.font);
        String s = this.formatter.format(this.templateValue);
        Rectangle2D tb = TextUtilities.getTextBounds(s, g2, fm);

        // align this rectangle to the frameAnchor
        Rectangle2D bounds = RectangleAnchor.createRectangle(new Size2D(
                tb.getWidth(), tb.getHeight()), pt.getX(), pt.getY(),
                this.frameAnchor);

        // add the insets
        Rectangle2D fb = this.insets.createOutsetRectangle(bounds);

        // draw the background
        g2.setPaint(this.backgroundPaint);
        g2.fill(fb);

        // draw the border
        g2.setStroke(this.outlineStroke);
        g2.setPaint(this.outlinePaint);
        g2.draw(fb);


        // now find the text anchor point
        double value = plot.getValue(this.datasetIndex);
        String valueStr = this.formatter.format(value);
        Point2D pt2 = RectangleAnchor.coordinates(bounds, this.valueAnchor);
        g2.setPaint(this.paint);
        g2.setFont(this.font);
        TextUtilities.drawAlignedString(valueStr, g2, (float) pt2.getX(),
                (float) pt2.getY(), this.textAnchor);

    }

    /**
     * Tests this instance for equality with an arbitrary object.
     *
     * @param obj  the object (<code>null permitted).
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof DialValueIndicator)) {
            return false;
        }
        DialValueIndicator that = (DialValueIndicator) obj;
        if (this.datasetIndex != that.datasetIndex) {
            return false;
        }
        if (this.angle != that.angle) {
            return false;
        }
        if (this.radius != that.radius) {
            return false;
        }
        if (!this.frameAnchor.equals(that.frameAnchor)) {
            return false;
        }
        if (!this.templateValue.equals(that.templateValue)) {
            return false;
        }
        if (!this.font.equals(that.font)) {
            return false;
        }
        if (!PaintUtilities.equal(this.paint, that.paint)) {
            return false;
        }
        if (!PaintUtilities.equal(this.backgroundPaint, that.backgroundPaint)) {
            return false;
        }
        if (!this.outlineStroke.equals(that.outlineStroke)) {
            return false;
        }
        if (!PaintUtilities.equal(this.outlinePaint, that.outlinePaint)) {
            return false;
        }
        if (!this.insets.equals(that.insets)) {
            return false;
        }
        if (!this.valueAnchor.equals(that.valueAnchor)) {
            return false;
        }
        if (!this.textAnchor.equals(that.textAnchor)) {
            return false;
        }

        return super.equals(obj);
    }

    /**
     * Returns a hash code for this instance.
     *
     * @return The hash code.
     */
    public int hashCode() {
        int result = 193;
        result = 37 * result + HashUtilities.hashCodeForPaint(this.paint);
        result = 37 * result + HashUtilities.hashCodeForPaint(
                this.backgroundPaint);
        result = 37 * result + HashUtilities.hashCodeForPaint(
                this.outlinePaint);
        result = 37 * result + this.outlineStroke.hashCode();
        return result;
    }

    /**
     * Returns a clone of this instance.
     *
     * @return The clone.
     *
     * @throws CloneNotSupportedException if some attribute of this instance
     *     cannot be cloned.
     */
    public Object clone() throws CloneNotSupportedException {
        return super.clone();
    }

    /**
     * Provides serialization support.
     *
     * @param stream  the output stream.
     *
     * @throws IOException  if there is an I/O error.
     */
    private void writeObject(ObjectOutputStream stream) throws IOException {
        stream.defaultWriteObject();
        SerialUtilities.writePaint(this.paint, stream);
        SerialUtilities.writePaint(this.backgroundPaint, stream);
        SerialUtilities.writePaint(this.outlinePaint, stream);
        SerialUtilities.writeStroke(this.outlineStroke, stream);
    }

    /**
     * Provides serialization support.
     *
     * @param stream  the input stream.
     *
     * @throws IOException  if there is an I/O error.
     * @throws ClassNotFoundException  if there is a classpath problem.
     */
    private void readObject(ObjectInputStream stream)
            throws IOException, ClassNotFoundException {
        stream.defaultReadObject();
        this.paint = SerialUtilities.readPaint(stream);
        this.backgroundPaint = SerialUtilities.readPaint(stream);
        this.outlinePaint = SerialUtilities.readPaint(stream);
        this.outlineStroke = SerialUtilities.readStroke(stream);
    }

}

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