Java tutorial
/* =========================================================== * JFreeChart : a free chart library for the Java(tm) platform * =========================================================== * * (C) Copyright 2000-2007, 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.] * * -------------------- * SimpleDialFrame.java * -------------------- * (C) Copyright 2006, 2007, by Object Refinery Limited. * * Original Author: David Gilbert (for Object Refinery Limited); * Contributor(s): -; * * $Id: SimpleDialFrame.java,v 1.1.2.3 2007/03/08 16:51:07 mungady Exp $ * * Changes * ------- * 03-Nov-2006 : Version 1 (DG); * 08-Mar-2007 : Fix in hashCode() (DG); * */ package org.jfree.experimental.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. */ public class SimpleDialFrame extends AbstractDialLayer implements DialFrame, Cloneable, PublicCloneable, Serializable { /** 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>SimpleDialFrame</code>. */ public SimpleDialFrame() { 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. */ public double getRadius() { return this.radius; } /** * Sets the radius. * * @param radius the radius. */ public void setRadius(double radius) { // TODO: validation this.radius = radius; notifyListeners(new DialLayerChangeEvent(this)); } /** * Returns the background paint. * * @return The background paint (never <code>null</code>). * * @see #setBackgroundPaint(Paint) */ public Paint getBackgroundPaint() { return this.backgroundPaint; } /** * Sets the background paint. * * @param paint the paint (<code>null</code> 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</code>). * * @see #setForegroundPaint(Paint) */ public Paint getForegroundPaint() { return this.foregroundPaint; } /** * Sets the foreground paint. * * @param paint the paint (<code>null</code> 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</code>). * * @see #setStroke(Stroke) */ public Stroke getStroke() { return this.stroke; } /** * Sets the stroke. * * @param stroke the stroke (<code>null</code> 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</code> 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</code> 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</code> not permitted). * @param plot the plot (<code>null</code> not permitted). * @param frame the frame (<code>null</code> not permitted). * @param view the view (<code>null</code> 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</code> permitted). * * @return A boolean. */ public boolean equals(Object obj) { if (obj == this) { return true; } if (!(obj instanceof SimpleDialFrame)) { return false; } SimpleDialFrame that = (SimpleDialFrame) 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 true; } /** * 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); } }