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jfreechart example source code file (StandardDialFrame.java)

This example jfreechart source code file (StandardDialFrame.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

area, area, awt, diallayerchangeevent, diallayerchangeevent, geometry, illegalargumentexception, illegalargumentexception, io, ioexception, null, paint, rectangle2d, shape, standarddialframe, standarddialframe, stroke

The jfreechart StandardDialFrame.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.]
 *
 * ----------------------
 * StandardDialFrame.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);
 * 08-Mar-2007 : Fix in hashCode() (DG);
 * 29-Oct-2007 : Renamed StandardDialFrame (DG);
 *
 */

package org.jfree.chart.plot.dial;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.geom.Area;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Rectangle2D;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

import org.jfree.chart.HashUtilities;
import org.jfree.io.SerialUtilities;
import org.jfree.util.PaintUtilities;
import org.jfree.util.PublicCloneable;

/**
 * A simple circular frame for the {@link DialPlot} class.
 *
 * @since 1.0.7
 */
public class StandardDialFrame extends AbstractDialLayer implements DialFrame,
        Cloneable, PublicCloneable, Serializable {

    /** For serialization. */
    static final long serialVersionUID = 1016585407507121596L;

    /** The outer radius, relative to the framing rectangle. */
    private double radius;

    /**
     * The color used for the front of the panel.  This field is transient
     * because it requires special handling for serialization.
     */
    private transient Paint backgroundPaint;

    /**
     * The color used for the border around the window. This field is transient
     * because it requires special handling for serialization.
     */
    private transient Paint foregroundPaint;

    /**
     * The stroke for drawing the frame outline.  This field is transient
     * because it requires special handling for serialization.
     */
    private transient Stroke stroke;

    /**
     * Creates a new instance of <code>StandardDialFrame.
     */
    public StandardDialFrame() {
        this.backgroundPaint = Color.gray;
        this.foregroundPaint = Color.black;
        this.stroke = new BasicStroke(2.0f);
        this.radius = 0.95;
    }

    /**
     * Returns the radius, relative to the framing rectangle.
     *
     * @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 (must be positive).
     *
     * @see #getRadius()
     */
    public void setRadius(double radius) {
        if (radius <= 0) {
            throw new IllegalArgumentException(
                    "The 'radius' must be positive.");
        }
        this.radius = radius;
        notifyListeners(new DialLayerChangeEvent(this));
    }

    /**
     * Returns the background paint.
     *
     * @return The background paint (never <code>null).
     *
     * @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 foreground paint.
     *
     * @return The foreground paint (never <code>null).
     *
     * @see #setForegroundPaint(Paint)
     */
    public Paint getForegroundPaint() {
        return this.foregroundPaint;
    }

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

    /**
     * Returns the stroke for the frame.
     *
     * @return The stroke (never <code>null).
     *
     * @see #setStroke(Stroke)
     */
    public Stroke getStroke() {
        return this.stroke;
    }

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

    /**
     * Returns the shape for the window for this dial.  Some dial layers will
     * request that their drawing be clipped within this window.
     *
     * @param frame  the reference frame (<code>null not permitted).
     *
     * @return The shape of the dial's window.
     */
    public Shape getWindow(Rectangle2D frame) {
        Rectangle2D f = DialPlot.rectangleByRadius(frame, this.radius,
                this.radius);
        return new Ellipse2D.Double(f.getX(), f.getY(), f.getWidth(),
                f.getHeight());
    }

    /**
     * Returns <code>false to indicate that this dial layer is not
     * clipped to the dial window.
     *
     * @return A boolean.
     */
    public boolean isClippedToWindow() {
        return false;
    }

    /**
     * Draws the frame.  This method is called by the {@link DialPlot} class,
     * you shouldn't need to call it directly.
     *
     * @param g2  the graphics target (<code>null not permitted).
     * @param plot  the plot (<code>null not permitted).
     * @param frame  the frame (<code>null not permitted).
     * @param view  the view (<code>null not permitted).
     */
    public void draw(Graphics2D g2, DialPlot plot, Rectangle2D frame,
            Rectangle2D view) {

        Shape window = getWindow(frame);

        Rectangle2D f = DialPlot.rectangleByRadius(frame, this.radius + 0.02,
                this.radius + 0.02);
        Ellipse2D e = new Ellipse2D.Double(f.getX(), f.getY(), f.getWidth(),
                f.getHeight());

        Area area = new Area(e);
        Area area2 = new Area(window);
        area.subtract(area2);
        g2.setPaint(this.backgroundPaint);
        g2.fill(area);

        g2.setStroke(this.stroke);
        g2.setPaint(this.foregroundPaint);
        g2.draw(window);
        g2.draw(e);
    }

    /**
     * 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 StandardDialFrame)) {
            return false;
        }
        StandardDialFrame that = (StandardDialFrame) obj;
        if (!PaintUtilities.equal(this.backgroundPaint, that.backgroundPaint)) {
            return false;
        }
        if (!PaintUtilities.equal(this.foregroundPaint, that.foregroundPaint)) {
            return false;
        }
        if (this.radius != that.radius) {
            return false;
        }
        if (!this.stroke.equals(that.stroke)) {
            return false;
        }
        return super.equals(obj);
    }

    /**
     * Returns a hash code for this instance.
     *
     * @return The hash code.
     */
    public int hashCode() {
        int result = 193;
        long temp = Double.doubleToLongBits(this.radius);
        result = 37 * result + (int) (temp ^ (temp >>> 32));
        result = 37 * result + HashUtilities.hashCodeForPaint(
                this.backgroundPaint);
        result = 37 * result + HashUtilities.hashCodeForPaint(
                this.foregroundPaint);
        result = 37 * result + this.stroke.hashCode();
        return result;
    }

    /**
     * Returns a clone of this instance.
     *
     * @return A clone.
     *
     * @throws CloneNotSupportedException if any of the frame's attributes
     *     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.backgroundPaint, stream);
        SerialUtilities.writePaint(this.foregroundPaint, stream);
        SerialUtilities.writeStroke(this.stroke, 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.backgroundPaint = SerialUtilities.readPaint(stream);
        this.foregroundPaint = SerialUtilities.readPaint(stream);
        this.stroke = SerialUtilities.readStroke(stream);
    }

}

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