/* ===========================================================
* 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.]
*
* -------------------
* DialBackground.java
* -------------------
* (C) Copyright 2006, 2007, by Object Refinery Limited.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): -;
*
* Changes
* -------
* 03-Nov-2006 : Version 1 (DG);
* 16-Oct-2007 : The equals() method needs to call super.equals() (DG);
*
*/
package org.jfree.chart.plot.dial;
import java.awt.Color;
import java.awt.GradientPaint;
import java.awt.Graphics2D;
import java.awt.Paint;
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.ui.GradientPaintTransformer;
import org.jfree.ui.StandardGradientPaintTransformer;
import org.jfree.util.PaintUtilities;
import org.jfree.util.PublicCloneable;
/**
* A regular dial layer that can be used to draw the background for a dial.
*
* @since 1.0.7
*/
public class DialBackground extends AbstractDialLayer implements DialLayer,
Cloneable, PublicCloneable, Serializable {
/** For serialization. */
static final long serialVersionUID = -9019069533317612375L;
/**
* The background paint. This field is transient because serialization
* requires special handling.
*/
private transient Paint paint;
/**
* The transformer used when the background paint is an instance of
* <code>GradientPaint</code>.
*/
private GradientPaintTransformer gradientPaintTransformer;
/**
* Creates a new instance of <code>DialBackground</code>. The
* default background paint is <code>Color.white</code>.
*/
public DialBackground() {
this(Color.white);
}
/**
* Creates a new instance of <code>DialBackground</code>. The
*
* @param paint the paint (<code>null</code> not permitted).
*
* @throws IllegalArgumentException if <code>paint</code> is
* <code>null</code>.
*/
public DialBackground(Paint paint) {
if (paint == null) {
throw new IllegalArgumentException("Null 'paint' argument.");
}
this.paint = paint;
this.gradientPaintTransformer = new StandardGradientPaintTransformer();
}
/**
* Returns the paint used to fill the background.
*
* @return The paint (never <code>null</code>).
*
* @see #setPaint(Paint)
*/
public Paint getPaint() {
return this.paint;
}
/**
* Sets the paint for the dial background and sends a
* {@link DialLayerChangeEvent} to all registered listeners.
*
* @param paint the paint (<code>null</code> not permitted).
*
* @see #getPaint()
*/
public void setPaint(Paint paint) {
if (paint == null) {
throw new IllegalArgumentException("Null 'paint' argument.");
}
this.paint = paint;
notifyListeners(new DialLayerChangeEvent(this));
}
/**
* Returns the transformer used to adjust the coordinates of any
* <code>GradientPaint</code> instance used for the background paint.
*
* @return The transformer (never <code>null</code>).
*
* @see #setGradientPaintTransformer(GradientPaintTransformer)
*/
public GradientPaintTransformer getGradientPaintTransformer() {
return this.gradientPaintTransformer;
}
/**
* Sets the transformer used to adjust the coordinates of any
* <code>GradientPaint</code> instance used for the background paint, and
* sends a {@link DialLayerChangeEvent} to all registered listeners.
*
* @param t the transformer (<code>null</code> not permitted).
*
* @see #getGradientPaintTransformer()
*/
public void setGradientPaintTransformer(GradientPaintTransformer t) {
if (t == null) {
throw new IllegalArgumentException("Null 't' argument.");
}
this.gradientPaintTransformer = t;
notifyListeners(new DialLayerChangeEvent(this));
}
/**
* Returns <code>true</code> to indicate that this layer should be
* clipped within the dial window.
*
* @return <code>true</code>.
*/
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).
*/
public void draw(Graphics2D g2, DialPlot plot, Rectangle2D frame,
Rectangle2D view) {
Paint p = this.paint;
if (p instanceof GradientPaint) {
p = this.gradientPaintTransformer.transform((GradientPaint) p,
view);
}
g2.setPaint(p);
g2.fill(view);
}
/**
* 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 DialBackground)) {
return false;
}
DialBackground that = (DialBackground) obj;
if (!PaintUtilities.equal(this.paint, that.paint)) {
return false;
}
if (!this.gradientPaintTransformer.equals(
that.gradientPaintTransformer)) {
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.paint);
result = 37 * result + this.gradientPaintTransformer.hashCode();
return result;
}
/**
* Returns a clone of this instance.
*
* @return The clone.
*
* @throws CloneNotSupportedException if some 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.paint, 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.paint = SerialUtilities.readPaint(stream);
}
}
|