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jfreechart example source code file (ArcDialFrame.java)

This example jfreechart source code file (ArcDialFrame.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

arc2d, arcdialframe, arcdialframe, area, awt, diallayerchangeevent, diallayerchangeevent, generalpath, geometry, illegalargumentexception, illegalargumentexception, io, null, paint, rectangle2d, rectangle2d, shape

The jfreechart ArcDialFrame.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.]
 *
 * -----------------
 * ArcDialFrame.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);
 * 17-Oct-2007 : Updated equals() (DG);
 * 24-Oct-2007 : Added argument checks and API docs, and renamed
 *               StandardDialFrame --> ArcDialFrame (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.Arc2D;
import java.awt.geom.Area;
import java.awt.geom.GeneralPath;
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 org.jfree.chart.HashUtilities;
import org.jfree.io.SerialUtilities;
import org.jfree.util.PaintUtilities;
import org.jfree.util.PublicCloneable;

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

    /** For serialization. */
    static final long serialVersionUID = -4089176959553523499L;

    /**
     * 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;

    /**
     * The start angle.
     */
    private double startAngle;

    /**
     * The end angle.
     */
    private double extent;

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

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

    /**
     * Creates a new instance of <code>ArcDialFrame that spans
     * 180 degrees.
     */
    public ArcDialFrame() {
        this(0, 180);
    }

    /**
     * Creates a new instance of <code>ArcDialFrame that spans
     * the arc specified.
     *
     * @param startAngle  the startAngle (in degrees).
     * @param extent  the extent of the arc (in degrees, counter-clockwise).
     */
    public ArcDialFrame(double startAngle, double extent) {
        this.backgroundPaint = Color.gray;
        this.foregroundPaint = new Color(100, 100, 150);
        this.stroke = new BasicStroke(2.0f);
        this.innerRadius = 0.25;
        this.outerRadius = 0.75;
        this.startAngle = startAngle;
        this.extent = extent;
    }

    /**
     * Returns the background paint (never <code>null).
     *
     * @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 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.
     *
     * @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 inner radius, relative to the framing rectangle.
     *
     * @return The inner radius.
     *
     * @see #setInnerRadius(double)
     */
    public double getInnerRadius() {
        return this.innerRadius;
    }

    /**
     * Sets the inner radius and sends a {@link DialLayerChangeEvent} to
     * all registered listeners.
     *
     * @param radius  the inner radius.
     *
     * @see #getInnerRadius()
     */
    public void setInnerRadius(double radius) {
        if (radius < 0.0) {
            throw new IllegalArgumentException("Negative 'radius' argument.");
        }
        this.innerRadius = radius;
        notifyListeners(new DialLayerChangeEvent(this));
    }

    /**
     * Returns the outer radius, relative to the framing rectangle.
     *
     * @return The outer radius.
     *
     * @see #setOuterRadius(double)
     */
    public double getOuterRadius() {
        return this.outerRadius;
    }

    /**
     * Sets the outer radius and sends a {@link DialLayerChangeEvent} to
     * all registered listeners.
     *
     * @param radius  the outer radius.
     *
     * @see #getOuterRadius()
     */
    public void setOuterRadius(double radius) {
        if (radius < 0.0) {
            throw new IllegalArgumentException("Negative 'radius' argument.");
        }
        this.outerRadius = radius;
        notifyListeners(new DialLayerChangeEvent(this));
    }

    /**
     * Returns the start angle.
     *
     * @return The start angle.
     *
     * @see #setStartAngle(double)
     */
    public double getStartAngle() {
        return this.startAngle;
    }

    /**
     * Sets the start angle and sends a {@link DialLayerChangeEvent} to
     * all registered listeners.
     *
     * @param angle  the angle.
     *
     * @see #getStartAngle()
     */
    public void setStartAngle(double angle) {
        this.startAngle = angle;
        notifyListeners(new DialLayerChangeEvent(this));
    }

    /**
     * Returns the extent.
     *
     * @return The extent.
     *
     * @see #setExtent(double)
     */
    public double getExtent() {
        return this.extent;
    }

    /**
     * Sets the extent and sends a {@link DialLayerChangeEvent} to
     * all registered listeners.
     *
     * @param extent  the extent.
     *
     * @see #getExtent()
     */
    public void setExtent(double extent) {
        this.extent = extent;
        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 innerFrame = DialPlot.rectangleByRadius(frame,
                this.innerRadius, this.innerRadius);
        Rectangle2D outerFrame = DialPlot.rectangleByRadius(frame,
                this.outerRadius, this.outerRadius);
        Arc2D inner = new Arc2D.Double(innerFrame, this.startAngle,
                this.extent, Arc2D.OPEN);
        Arc2D outer = new Arc2D.Double(outerFrame, this.startAngle
                + this.extent, -this.extent, Arc2D.OPEN);
        GeneralPath p = new GeneralPath();
        Point2D point1 = inner.getStartPoint();
        p.moveTo((float) point1.getX(), (float) point1.getY());
        p.append(inner, true);
        p.append(outer, true);
        p.closePath();
        return p;

    }

    /**
     * Returns the outer window.
     *
     * @param frame  the frame.
     *
     * @return The outer window.
     */
    protected Shape getOuterWindow(Rectangle2D frame) {
        double radiusMargin = 0.02;
        double angleMargin = 1.5;
        Rectangle2D innerFrame = DialPlot.rectangleByRadius(frame,
                this.innerRadius - radiusMargin, this.innerRadius
                - radiusMargin);
        Rectangle2D outerFrame = DialPlot.rectangleByRadius(frame,
                this.outerRadius + radiusMargin, this.outerRadius
                + radiusMargin);
        Arc2D inner = new Arc2D.Double(innerFrame, this.startAngle
                - angleMargin, this.extent + 2 * angleMargin, Arc2D.OPEN);
        Arc2D outer = new Arc2D.Double(outerFrame, this.startAngle
                + angleMargin + this.extent, -this.extent - 2 * angleMargin,
                Arc2D.OPEN);
        GeneralPath p = new GeneralPath();
        Point2D point1 = inner.getStartPoint();
        p.moveTo((float) point1.getX(), (float) point1.getY());
        p.append(inner, true);
        p.append(outer, true);
        p.closePath();
        return p;
    }

    /**
     * Draws the frame.
     *
     * @param g2  the graphics target.
     * @param plot  the plot.
     * @param frame  the dial's reference frame.
     * @param view  the dial's view rectangle.
     */
    public void draw(Graphics2D g2, DialPlot plot, Rectangle2D frame,
            Rectangle2D view) {

        Shape window = getWindow(frame);
        Shape outerWindow = getOuterWindow(frame);

        Area area1 = new Area(outerWindow);
        Area area2 = new Area(window);
        area1.subtract(area2);
        g2.setPaint(Color.lightGray);
        g2.fill(area1);

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

    }

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

    /**
     * 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 ArcDialFrame)) {
            return false;
        }
        ArcDialFrame that = (ArcDialFrame) obj;
        if (!PaintUtilities.equal(this.backgroundPaint, that.backgroundPaint)) {
            return false;
        }
        if (!PaintUtilities.equal(this.foregroundPaint, that.foregroundPaint)) {
            return false;
        }
        if (this.startAngle != that.startAngle) {
            return false;
        }
        if (this.extent != that.extent) {
            return false;
        }
        if (this.innerRadius != that.innerRadius) {
            return false;
        }
        if (this.outerRadius != that.outerRadius) {
            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.startAngle);
        result = 37 * result + (int) (temp ^ (temp >>> 32));
        temp = Double.doubleToLongBits(this.extent);
        result = 37 * result + (int) (temp ^ (temp >>> 32));
        temp = Double.doubleToLongBits(this.innerRadius);
        result = 37 * result + (int) (temp ^ (temp >>> 32));
        temp = Double.doubleToLongBits(this.outerRadius);
        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 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.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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