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jfreechart example source code file (DialCap.java)

This example jfreechart source code file (DialCap.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, clonenotsupportedexception, dialcap, dialcap, diallayer, diallayerchangeevent, diallayerchangeevent, geometry, illegalargumentexception, illegalargumentexception, io, ioexception, null, paint, paint, rectangle2d, stroke

The jfreechart DialCap.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.]
 *
 * ------------
 * DialCap.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() method (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.Stroke;
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 regular dial layer that can be used to draw a cap over the center of
 * the dial (the base of the dial pointer(s)).
 *
 * @since 1.0.7
 */
public class DialCap extends AbstractDialLayer implements DialLayer, Cloneable,
        PublicCloneable, Serializable {

    /** For serialization. */
    static final long serialVersionUID = -2929484264982524463L;

    /**
     * The radius of the cap, as a percentage of the framing rectangle.
     */
    private double radius;

    /**
     * The fill paint.  This field is transient because it requires special
     * handling for serialization.
     */
    private transient Paint fillPaint;

    /**
     * The paint used to draw the cap outline (this should never be
     * <code>null).  This field is transient because it requires
     * special handling for serialization.
     */
    private transient Paint outlinePaint;

    /**
     * The stroke used to draw the cap outline (this should never be
     * <code>null).   This field is transient because it requires
     * special handling for serialization.
     */
    private transient Stroke outlineStroke;

    /**
     * Creates a new instance of <code>StandardDialBackground.  The
     * default background paint is <code>Color.white.
     */
    public DialCap() {
        this.radius = 0.05;
        this.fillPaint = Color.white;
        this.outlinePaint = Color.black;
        this.outlineStroke = new BasicStroke(2.0f);
    }

    /**
     * Returns the radius of the cap, as a percentage of the dial's framing
     * rectangle.
     *
     * @return The radius.
     *
     * @see #setRadius(double)
     */
    public double getRadius() {
        return this.radius;
    }

    /**
     * Sets the radius of the cap, as a percentage of the dial's framing
     * rectangle, and sends a {@link DialLayerChangeEvent} to all registered
     * listeners.
     *
     * @param radius  the radius (must be greater than zero).
     *
     * @see #getRadius()
     */
    public void setRadius(double radius) {
        if (radius <= 0.0) {
            throw new IllegalArgumentException("Requires radius > 0.0.");
        }
        this.radius = radius;
        notifyListeners(new DialLayerChangeEvent(this));
    }

    /**
     * Returns the paint used to fill the cap.
     *
     * @return The paint (never <code>null).
     *
     * @see #setFillPaint(Paint)
     */
    public Paint getFillPaint() {
        return this.fillPaint;
    }

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

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

    /**
     * Sets the paint used to draw the outline of the cap 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 stroke used to draw the outline of the cap.
     *
     * @return The stroke (never <code>null).
     *
     * @see #setOutlineStroke(Stroke)
     */
    public Stroke getOutlineStroke() {
        return this.outlineStroke;
    }

    /**
     * Sets the stroke used to draw the outline of the cap 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 <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) {

        g2.setPaint(this.fillPaint);

        Rectangle2D f = DialPlot.rectangleByRadius(frame, this.radius,
                this.radius);
        Ellipse2D e = new Ellipse2D.Double(f.getX(), f.getY(), f.getWidth(),
                f.getHeight());
        g2.fill(e);
        g2.setPaint(this.outlinePaint);
        g2.setStroke(this.outlineStroke);
        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 DialCap)) {
            return false;
        }
        DialCap that = (DialCap) obj;
        if (this.radius != that.radius) {
            return false;
        }
        if (!PaintUtilities.equal(this.fillPaint, that.fillPaint)) {
            return false;
        }
        if (!PaintUtilities.equal(this.outlinePaint, that.outlinePaint)) {
            return false;
        }
        if (!this.outlineStroke.equals(that.outlineStroke)) {
            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.fillPaint);
        result = 37 * result + HashUtilities.hashCodeForPaint(
                this.outlinePaint);
        result = 37 * result + this.outlineStroke.hashCode();
        return result;
    }

    /**
     * Returns a clone of this instance.
     *
     * @return A clone.
     *
     * @throws CloneNotSupportedException if some attribute of the cap 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.fillPaint, 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.fillPaint = SerialUtilities.readPaint(stream);
        this.outlinePaint = SerialUtilities.readPaint(stream);
        this.outlineStroke = SerialUtilities.readStroke(stream);
    }

}

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