Java tutorial
/* =========================================================== * JFreeChart : a free chart library for the Java(tm) platform * =========================================================== * * (C) Copyright 2000-2013, 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. * * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. * Other names may be trademarks of their respective owners.] * * ------------ * DialCap.java * ------------ * (C) Copyright 2006-2013, 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.chart.util.ParamChecks; 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</code>). 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</code>). This field is transient because it requires * special handling for serialization. */ private transient Stroke outlineStroke; /** * Creates a new instance of <code>StandardDialBackground</code>. The * default background paint is <code>Color.white</code>. */ 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</code>). * * @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</code> not permitted). * * @see #getFillPaint() */ public void setFillPaint(Paint paint) { ParamChecks.nullNotPermitted(paint, "paint"); this.fillPaint = paint; notifyListeners(new DialLayerChangeEvent(this)); } /** * Returns the paint used to draw the outline of the cap. * * @return The paint (never <code>null</code>). * * @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</code> not permitted). * * @see #getOutlinePaint() */ public void setOutlinePaint(Paint paint) { ParamChecks.nullNotPermitted(paint, "paint"); this.outlinePaint = paint; notifyListeners(new DialLayerChangeEvent(this)); } /** * Returns the stroke used to draw the outline of the cap. * * @return The stroke (never <code>null</code>). * * @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</code> not permitted). * * @see #getOutlineStroke() */ public void setOutlineStroke(Stroke stroke) { ParamChecks.nullNotPermitted(stroke, "stroke"); this.outlineStroke = stroke; notifyListeners(new DialLayerChangeEvent(this)); } /** * Returns <code>true</code> to indicate that this layer should be * clipped within the dial window. * * @return <code>true</code>. */ @Override 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</code> not permitted). * @param plot the plot (ignored here). * @param frame the dial frame (ignored here). * @param view the view rectangle (<code>null</code> not permitted). */ @Override 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</code> permitted). * * @return A boolean. */ @Override 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. */ @Override 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. */ @Override 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); } }