jfreechart example source code file (DialPointer.java)
The jfreechart DialPointer.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.]
*
* ----------------
* DialPointer.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 : Added equals() overrides (DG);
* 24-Oct-2007 : Implemented PublicCloneable, changed default radius,
* and added argument checks (DG);
* 23-Nov-2007 : Added fillPaint and outlinePaint attributes to
* DialPointer.Pointer (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.Arc2D;
import java.awt.geom.GeneralPath;
import java.awt.geom.Line2D;
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 base class for the pointer in a {@link DialPlot}.
*
* @since 1.0.7
*/
public abstract class DialPointer extends AbstractDialLayer
implements DialLayer, Cloneable, PublicCloneable, Serializable {
/** The needle radius. */
double radius;
/**
* The dataset index for the needle.
*/
int datasetIndex;
/**
* Creates a new <code>DialPointer instance.
*/
protected DialPointer() {
this(0);
}
/**
* Creates a new pointer for the specified dataset.
*
* @param datasetIndex the dataset index.
*/
protected DialPointer(int datasetIndex) {
this.radius = 0.9;
this.datasetIndex = datasetIndex;
}
/**
* Returns the dataset index that the pointer maps to.
*
* @return The dataset index.
*
* @see #getDatasetIndex()
*/
public int getDatasetIndex() {
return this.datasetIndex;
}
/**
* Sets the dataset index for the pointer and sends a
* {@link DialLayerChangeEvent} to all registered listeners.
*
* @param index the index.
*
* @see #getDatasetIndex()
*/
public void setDatasetIndex(int index) {
this.datasetIndex = index;
notifyListeners(new DialLayerChangeEvent(this));
}
/**
* Returns the radius of the pointer, 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 pointer and sends a
* {@link DialLayerChangeEvent} to all registered listeners.
*
* @param radius the radius.
*
* @see #getRadius()
*/
public void setRadius(double radius) {
this.radius = radius;
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;
}
/**
* Checks this instance for equality with an arbitrary object.
*
* @param obj the object (<code>null not permitted).
*
* @return A boolean.
*/
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof DialPointer)) {
return false;
}
DialPointer that = (DialPointer) obj;
if (this.datasetIndex != that.datasetIndex) {
return false;
}
if (this.radius != that.radius) {
return false;
}
return super.equals(obj);
}
/**
* Returns a hash code.
*
* @return A hash code.
*/
public int hashCode() {
int result = 23;
result = HashUtilities.hashCode(result, this.radius);
return result;
}
/**
* Returns a clone of the pointer.
*
* @return a clone.
*
* @throws CloneNotSupportedException if one of the attributes cannot
* be cloned.
*/
public Object clone() throws CloneNotSupportedException {
return super.clone();
}
/**
* A dial pointer that draws a thin line (like a pin).
*/
public static class Pin extends DialPointer {
/** For serialization. */
static final long serialVersionUID = -8445860485367689750L;
/** The paint. */
private transient Paint paint;
/** The stroke. */
private transient Stroke stroke;
/**
* Creates a new instance.
*/
public Pin() {
this(0);
}
/**
* Creates a new instance.
*
* @param datasetIndex the dataset index.
*/
public Pin(int datasetIndex) {
super(datasetIndex);
this.paint = Color.red;
this.stroke = new BasicStroke(3.0f, BasicStroke.CAP_ROUND,
BasicStroke.JOIN_BEVEL);
}
/**
* Returns the paint.
*
* @return The paint (never <code>null).
*
* @see #setPaint(Paint)
*/
public Paint getPaint() {
return this.paint;
}
/**
* Sets the paint and sends a {@link DialLayerChangeEvent} to all
* registered listeners.
*
* @param paint the paint (<code>null 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 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));
}
/**
* Draws the pointer.
*
* @param g2 the graphics target.
* @param plot the plot.
* @param frame the dial's reference frame.
* @param view the dial's view.
*/
public void draw(Graphics2D g2, DialPlot plot, Rectangle2D frame,
Rectangle2D view) {
g2.setPaint(this.paint);
g2.setStroke(this.stroke);
Rectangle2D arcRect = DialPlot.rectangleByRadius(frame,
this.radius, this.radius);
double value = plot.getValue(this.datasetIndex);
DialScale scale = plot.getScaleForDataset(this.datasetIndex);
double angle = scale.valueToAngle(value);
Arc2D arc = new Arc2D.Double(arcRect, angle, 0, Arc2D.OPEN);
Point2D pt = arc.getEndPoint();
Line2D line = new Line2D.Double(frame.getCenterX(),
frame.getCenterY(), pt.getX(), pt.getY());
g2.draw(line);
}
/**
* Tests this pointer 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 DialPointer.Pin)) {
return false;
}
DialPointer.Pin that = (DialPointer.Pin) obj;
if (!PaintUtilities.equal(this.paint, that.paint)) {
return false;
}
if (!this.stroke.equals(that.stroke)) {
return false;
}
return super.equals(obj);
}
/**
* Returns a hash code for this instance.
*
* @return A hash code.
*/
public int hashCode() {
int result = super.hashCode();
result = HashUtilities.hashCode(result, this.paint);
result = HashUtilities.hashCode(result, this.stroke);
return result;
}
/**
* 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);
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.paint = SerialUtilities.readPaint(stream);
this.stroke = SerialUtilities.readStroke(stream);
}
}
/**
* A dial pointer.
*/
public static class Pointer extends DialPointer {
/** For serialization. */
static final long serialVersionUID = -4180500011963176960L;
/**
* The radius that defines the width of the pointer at the base.
*/
private double widthRadius;
/**
* The fill paint.
*
* @since 1.0.8
*/
private transient Paint fillPaint;
/**
* The outline paint.
*
* @since 1.0.8
*/
private transient Paint outlinePaint;
/**
* Creates a new instance.
*/
public Pointer() {
this(0);
}
/**
* Creates a new instance.
*
* @param datasetIndex the dataset index.
*/
public Pointer(int datasetIndex) {
super(datasetIndex);
this.widthRadius = 0.05;
this.fillPaint = Color.gray;
this.outlinePaint = Color.black;
}
/**
* Returns the width radius.
*
* @return The width radius.
*
* @see #setWidthRadius(double)
*/
public double getWidthRadius() {
return this.widthRadius;
}
/**
* Sets the width radius and sends a {@link DialLayerChangeEvent} to
* all registered listeners.
*
* @param radius the radius
*
* @see #getWidthRadius()
*/
public void setWidthRadius(double radius) {
this.widthRadius = radius;
notifyListeners(new DialLayerChangeEvent(this));
}
/**
* Returns the fill paint.
*
* @return The paint (never <code>null).
*
* @see #setFillPaint(Paint)
*
* @since 1.0.8
*/
public Paint getFillPaint() {
return this.fillPaint;
}
/**
* Sets the fill paint and sends a {@link DialLayerChangeEvent} to all
* registered listeners.
*
* @param paint the paint (<code>null not permitted).
*
* @see #getFillPaint()
*
* @since 1.0.8
*/
public void setFillPaint(Paint paint) {
if (paint == null) {
throw new IllegalArgumentException("Null 'paint' argument.");
}
this.fillPaint = paint;
notifyListeners(new DialLayerChangeEvent(this));
}
/**
* Returns the outline paint.
*
* @return The paint (never <code>null).
*
* @see #setOutlinePaint(Paint)
*
* @since 1.0.8
*/
public Paint getOutlinePaint() {
return this.outlinePaint;
}
/**
* Sets the outline paint and sends a {@link DialLayerChangeEvent} to
* all registered listeners.
*
* @param paint the paint (<code>null not permitted).
*
* @see #getOutlinePaint()
*
* @since 1.0.8
*/
public void setOutlinePaint(Paint paint) {
if (paint == null) {
throw new IllegalArgumentException("Null 'paint' argument.");
}
this.outlinePaint = paint;
notifyListeners(new DialLayerChangeEvent(this));
}
/**
* Draws the pointer.
*
* @param g2 the graphics target.
* @param plot the plot.
* @param frame the dial's reference frame.
* @param view the dial's view.
*/
public void draw(Graphics2D g2, DialPlot plot, Rectangle2D frame,
Rectangle2D view) {
g2.setPaint(Color.blue);
g2.setStroke(new BasicStroke(1.0f));
Rectangle2D lengthRect = DialPlot.rectangleByRadius(frame,
this.radius, this.radius);
Rectangle2D widthRect = DialPlot.rectangleByRadius(frame,
this.widthRadius, this.widthRadius);
double value = plot.getValue(this.datasetIndex);
DialScale scale = plot.getScaleForDataset(this.datasetIndex);
double angle = scale.valueToAngle(value);
Arc2D arc1 = new Arc2D.Double(lengthRect, angle, 0, Arc2D.OPEN);
Point2D pt1 = arc1.getEndPoint();
Arc2D arc2 = new Arc2D.Double(widthRect, angle - 90.0, 180.0,
Arc2D.OPEN);
Point2D pt2 = arc2.getStartPoint();
Point2D pt3 = arc2.getEndPoint();
Arc2D arc3 = new Arc2D.Double(widthRect, angle - 180.0, 0.0,
Arc2D.OPEN);
Point2D pt4 = arc3.getStartPoint();
GeneralPath gp = new GeneralPath();
gp.moveTo((float) pt1.getX(), (float) pt1.getY());
gp.lineTo((float) pt2.getX(), (float) pt2.getY());
gp.lineTo((float) pt4.getX(), (float) pt4.getY());
gp.lineTo((float) pt3.getX(), (float) pt3.getY());
gp.closePath();
g2.setPaint(this.fillPaint);
g2.fill(gp);
g2.setPaint(this.outlinePaint);
Line2D line = new Line2D.Double(frame.getCenterX(),
frame.getCenterY(), pt1.getX(), pt1.getY());
g2.draw(line);
line.setLine(pt2, pt3);
g2.draw(line);
line.setLine(pt3, pt1);
g2.draw(line);
line.setLine(pt2, pt1);
g2.draw(line);
line.setLine(pt2, pt4);
g2.draw(line);
line.setLine(pt3, pt4);
g2.draw(line);
}
/**
* Tests this pointer 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 DialPointer.Pointer)) {
return false;
}
DialPointer.Pointer that = (DialPointer.Pointer) obj;
if (this.widthRadius != that.widthRadius) {
return false;
}
if (!PaintUtilities.equal(this.fillPaint, that.fillPaint)) {
return false;
}
if (!PaintUtilities.equal(this.outlinePaint, that.outlinePaint)) {
return false;
}
return super.equals(obj);
}
/**
* Returns a hash code for this instance.
*
* @return A hash code.
*/
public int hashCode() {
int result = super.hashCode();
result = HashUtilities.hashCode(result, this.widthRadius);
result = HashUtilities.hashCode(result, this.fillPaint);
result = HashUtilities.hashCode(result, this.outlinePaint);
return result;
}
/**
* 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);
}
/**
* 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);
}
}
}
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