/* ===========================================================
* 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.]
*
* ------------------------
* XYPointerAnnotation.java
* ------------------------
* (C) Copyright 2003-2007, by Object Refinery Limited.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): -;
*
* Changes:
* --------
* 21-May-2003 : Version 1 (DG);
* 10-Jun-2003 : Changed BoundsAnchor to TextAnchor (DG);
* 02-Jul-2003 : Added accessor methods and simplified constructor (DG);
* 19-Aug-2003 : Implemented Cloneable (DG);
* 13-Oct-2003 : Fixed bug where arrow paint is not set correctly (DG);
* 21-Jan-2004 : Update for renamed method in ValueAxis (DG);
* 29-Sep-2004 : Changes to draw() method signature (DG);
* ------------- JFREECHART 1.0.x ---------------------------------------------
* 20-Feb-2006 : Correction for equals() method (fixes bug 1435160) (DG);
* 12-Jul-2006 : Fix drawing for PlotOrientation.HORIZONTAL, thanks to
* Skunk (DG);
*
*/
package org.jfree.chart.annotations;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Stroke;
import java.awt.geom.GeneralPath;
import java.awt.geom.Line2D;
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.axis.ValueAxis;
import org.jfree.chart.plot.Plot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.PlotRenderingInfo;
import org.jfree.chart.plot.XYPlot;
import org.jfree.io.SerialUtilities;
import org.jfree.text.TextUtilities;
import org.jfree.ui.RectangleEdge;
import org.jfree.util.ObjectUtilities;
import org.jfree.util.PublicCloneable;
/**
* An arrow and label that can be placed on an
* {@link org.jfree.chart.plot.XYPlot}. The arrow is drawn at a user-definable
* angle so that it points towards the (x, y) location for the annotation.
* <p>
* The arrow length (and its offset from the (x, y) location) is controlled by
* the tip radius and the base radius attributes. Imagine two circles around
* the (x, y) coordinate: the inner circle defined by the tip radius, and the
* outer circle defined by the base radius. Now, draw the arrow starting at
* some point on the outer circle (the point is determined by the angle), with
* the arrow tip being drawn at a corresponding point on the inner circle.
*
*/
public class XYPointerAnnotation extends XYTextAnnotation
implements Cloneable, PublicCloneable,
Serializable {
/** For serialization. */
private static final long serialVersionUID = -4031161445009858551L;
/** The default tip radius (in Java2D units). */
public static final double DEFAULT_TIP_RADIUS = 10.0;
/** The default base radius (in Java2D units). */
public static final double DEFAULT_BASE_RADIUS = 30.0;
/** The default label offset (in Java2D units). */
public static final double DEFAULT_LABEL_OFFSET = 3.0;
/** The default arrow length (in Java2D units). */
public static final double DEFAULT_ARROW_LENGTH = 5.0;
/** The default arrow width (in Java2D units). */
public static final double DEFAULT_ARROW_WIDTH = 3.0;
/** The angle of the arrow's line (in radians). */
private double angle;
/**
* The radius from the (x, y) point to the tip of the arrow (in Java2D
* units).
*/
private double tipRadius;
/**
* The radius from the (x, y) point to the start of the arrow line (in
* Java2D units).
*/
private double baseRadius;
/** The length of the arrow head (in Java2D units). */
private double arrowLength;
/** The arrow width (in Java2D units, per side). */
private double arrowWidth;
/** The arrow stroke. */
private transient Stroke arrowStroke;
/** The arrow paint. */
private transient Paint arrowPaint;
/** The radius from the base point to the anchor point for the label. */
private double labelOffset;
/**
* Creates a new label and arrow annotation.
*
* @param label the label (<code>null</code> permitted).
* @param x the x-coordinate (measured against the chart's domain axis).
* @param y the y-coordinate (measured against the chart's range axis).
* @param angle the angle of the arrow's line (in radians).
*/
public XYPointerAnnotation(String label, double x, double y, double angle) {
super(label, x, y);
this.angle = angle;
this.tipRadius = DEFAULT_TIP_RADIUS;
this.baseRadius = DEFAULT_BASE_RADIUS;
this.arrowLength = DEFAULT_ARROW_LENGTH;
this.arrowWidth = DEFAULT_ARROW_WIDTH;
this.labelOffset = DEFAULT_LABEL_OFFSET;
this.arrowStroke = new BasicStroke(1.0f);
this.arrowPaint = Color.black;
}
/**
* Returns the angle of the arrow.
*
* @return The angle (in radians).
*
* @see #setAngle(double)
*/
public double getAngle() {
return this.angle;
}
/**
* Sets the angle of the arrow.
*
* @param angle the angle (in radians).
*
* @see #getAngle()
*/
public void setAngle(double angle) {
this.angle = angle;
}
/**
* Returns the tip radius.
*
* @return The tip radius (in Java2D units).
*
* @see #setTipRadius(double)
*/
public double getTipRadius() {
return this.tipRadius;
}
/**
* Sets the tip radius.
*
* @param radius the radius (in Java2D units).
*
* @see #getTipRadius()
*/
public void setTipRadius(double radius) {
this.tipRadius = radius;
}
/**
* Returns the base radius.
*
* @return The base radius (in Java2D units).
*
* @see #setBaseRadius(double)
*/
public double getBaseRadius() {
return this.baseRadius;
}
/**
* Sets the base radius.
*
* @param radius the radius (in Java2D units).
*
* @see #getBaseRadius()
*/
public void setBaseRadius(double radius) {
this.baseRadius = radius;
}
/**
* Returns the label offset.
*
* @return The label offset (in Java2D units).
*
* @see #setLabelOffset(double)
*/
public double getLabelOffset() {
return this.labelOffset;
}
/**
* Sets the label offset (from the arrow base, continuing in a straight
* line, in Java2D units).
*
* @param offset the offset (in Java2D units).
*
* @see #getLabelOffset()
*/
public void setLabelOffset(double offset) {
this.labelOffset = offset;
}
/**
* Returns the arrow length.
*
* @return The arrow length.
*
* @see #setArrowLength(double)
*/
public double getArrowLength() {
return this.arrowLength;
}
/**
* Sets the arrow length.
*
* @param length the length.
*
* @see #getArrowLength()
*/
public void setArrowLength(double length) {
this.arrowLength = length;
}
/**
* Returns the arrow width.
*
* @return The arrow width (in Java2D units).
*
* @see #setArrowWidth(double)
*/
public double getArrowWidth() {
return this.arrowWidth;
}
/**
* Sets the arrow width.
*
* @param width the width (in Java2D units).
*
* @see #getArrowWidth()
*/
public void setArrowWidth(double width) {
this.arrowWidth = width;
}
/**
* Returns the stroke used to draw the arrow line.
*
* @return The arrow stroke (never <code>null</code>).
*
* @see #setArrowStroke(Stroke)
*/
public Stroke getArrowStroke() {
return this.arrowStroke;
}
/**
* Sets the stroke used to draw the arrow line.
*
* @param stroke the stroke (<code>null</code> not permitted).
*
* @see #getArrowStroke()
*/
public void setArrowStroke(Stroke stroke) {
if (stroke == null) {
throw new IllegalArgumentException("Null 'stroke' not permitted.");
}
this.arrowStroke = stroke;
}
/**
* Returns the paint used for the arrow.
*
* @return The arrow paint (never <code>null</code>).
*
* @see #setArrowPaint(Paint)
*/
public Paint getArrowPaint() {
return this.arrowPaint;
}
/**
* Sets the paint used for the arrow.
*
* @param paint the arrow paint (<code>null</code> not permitted).
*
* @see #getArrowPaint()
*/
public void setArrowPaint(Paint paint) {
if (paint == null) {
throw new IllegalArgumentException("Null 'paint' argument.");
}
this.arrowPaint = paint;
}
/**
* Draws the annotation.
*
* @param g2 the graphics device.
* @param plot the plot.
* @param dataArea the data area.
* @param domainAxis the domain axis.
* @param rangeAxis the range axis.
* @param rendererIndex the renderer index.
* @param info the plot rendering info.
*/
public void draw(Graphics2D g2, XYPlot plot, Rectangle2D dataArea,
ValueAxis domainAxis, ValueAxis rangeAxis,
int rendererIndex,
PlotRenderingInfo info) {
PlotOrientation orientation = plot.getOrientation();
RectangleEdge domainEdge = Plot.resolveDomainAxisLocation(
plot.getDomainAxisLocation(), orientation);
RectangleEdge rangeEdge = Plot.resolveRangeAxisLocation(
plot.getRangeAxisLocation(), orientation);
double j2DX = domainAxis.valueToJava2D(getX(), dataArea, domainEdge);
double j2DY = rangeAxis.valueToJava2D(getY(), dataArea, rangeEdge);
if (orientation == PlotOrientation.HORIZONTAL) {
double temp = j2DX;
j2DX = j2DY;
j2DY = temp;
}
double startX = j2DX + Math.cos(this.angle) * this.baseRadius;
double startY = j2DY + Math.sin(this.angle) * this.baseRadius;
double endX = j2DX + Math.cos(this.angle) * this.tipRadius;
double endY = j2DY + Math.sin(this.angle) * this.tipRadius;
double arrowBaseX = endX + Math.cos(this.angle) * this.arrowLength;
double arrowBaseY = endY + Math.sin(this.angle) * this.arrowLength;
double arrowLeftX = arrowBaseX
+ Math.cos(this.angle + Math.PI / 2.0) * this.arrowWidth;
double arrowLeftY = arrowBaseY
+ Math.sin(this.angle + Math.PI / 2.0) * this.arrowWidth;
double arrowRightX = arrowBaseX
- Math.cos(this.angle + Math.PI / 2.0) * this.arrowWidth;
double arrowRightY = arrowBaseY
- Math.sin(this.angle + Math.PI / 2.0) * this.arrowWidth;
GeneralPath arrow = new GeneralPath();
arrow.moveTo((float) endX, (float) endY);
arrow.lineTo((float) arrowLeftX, (float) arrowLeftY);
arrow.lineTo((float) arrowRightX, (float) arrowRightY);
arrow.closePath();
g2.setStroke(this.arrowStroke);
g2.setPaint(this.arrowPaint);
Line2D line = new Line2D.Double(startX, startY, endX, endY);
g2.draw(line);
g2.fill(arrow);
// draw the label
g2.setFont(getFont());
g2.setPaint(getPaint());
double labelX = j2DX
+ Math.cos(this.angle) * (this.baseRadius + this.labelOffset);
double labelY = j2DY
+ Math.sin(this.angle) * (this.baseRadius + this.labelOffset);
Rectangle2D hotspot = TextUtilities.drawAlignedString(getText(),
g2, (float) labelX, (float) labelY, getTextAnchor());
String toolTip = getToolTipText();
String url = getURL();
if (toolTip != null || url != null) {
addEntity(info, hotspot, rendererIndex, toolTip, url);
}
}
/**
* Tests this annotation for equality with an arbitrary object.
*
* @param obj the object (<code>null</code> permitted).
*
* @return <code>true</code> or <code>false</code>.
*/
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof XYPointerAnnotation)) {
return false;
}
if (!super.equals(obj)) {
return false;
}
XYPointerAnnotation that = (XYPointerAnnotation) obj;
if (this.angle != that.angle) {
return false;
}
if (this.tipRadius != that.tipRadius) {
return false;
}
if (this.baseRadius != that.baseRadius) {
return false;
}
if (this.arrowLength != that.arrowLength) {
return false;
}
if (this.arrowWidth != that.arrowWidth) {
return false;
}
if (!this.arrowPaint.equals(that.arrowPaint)) {
return false;
}
if (!ObjectUtilities.equal(this.arrowStroke, that.arrowStroke)) {
return false;
}
if (this.labelOffset != that.labelOffset) {
return false;
}
return true;
}
/**
* Returns a hash code for this instance.
*
* @return A hash code.
*/
public int hashCode() {
int result = super.hashCode();
long temp = Double.doubleToLongBits(this.angle);
result = 37 * result + (int) (temp ^ (temp >>> 32));
temp = Double.doubleToLongBits(this.tipRadius);
result = 37 * result + (int) (temp ^ (temp >>> 32));
temp = Double.doubleToLongBits(this.baseRadius);
result = 37 * result + (int) (temp ^ (temp >>> 32));
temp = Double.doubleToLongBits(this.arrowLength);
result = 37 * result + (int) (temp ^ (temp >>> 32));
temp = Double.doubleToLongBits(this.arrowWidth);
result = 37 * result + (int) (temp ^ (temp >>> 32));
result = result * 37 + HashUtilities.hashCodeForPaint(this.arrowPaint);
result = result * 37 + this.arrowStroke.hashCode();
temp = Double.doubleToLongBits(this.labelOffset);
result = 37 * result + (int) (temp ^ (temp >>> 32));
return super.hashCode();
}
/**
* Returns a clone of the annotation.
*
* @return A clone.
*
* @throws CloneNotSupportedException if the annotation can't 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.arrowPaint, stream);
SerialUtilities.writeStroke(this.arrowStroke, 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.arrowPaint = SerialUtilities.readPaint(stream);
this.arrowStroke = SerialUtilities.readStroke(stream);
}
}
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