/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2005, 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.]
*
* -------------------------
* XYDifferenceRenderer.java
* -------------------------
* (C) Copyright 2003-2005, by Object Refinery Limited.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): Christian W. Zuckschwerdt;
*
* $Id: XYDifferenceRenderer.java,v 1.12.2.5 2005/11/28 12:06:35 mungady Exp $
*
* Changes:
* --------
* 30-Apr-2003 : Version 1 (DG);
* 30-Jul-2003 : Modified entity constructor (CZ);
* 20-Aug-2003 : Implemented Cloneable and PublicCloneable (DG);
* 16-Sep-2003 : Changed ChartRenderingInfo --> PlotRenderingInfo (DG);
* 09-Feb-2004 : Updated to support horizontal plot orientation (DG);
* 10-Feb-2004 : Added default constructor, setter methods and updated
* Javadocs (DG);
* 25-Feb-2004 : Replaced CrosshairInfo with CrosshairState (DG);
* 30-Mar-2004 : Fixed bug in getNegativePaint() method (DG);
* 15-Jul-2004 : Switched getX() with getXValue() and getY() with
* getYValue() (DG);
* 25-Aug-2004 : Fixed a bug preventing the use of crosshairs (DG);
* 11-Nov-2004 : Now uses ShapeUtilities to translate shapes (DG);
* 19-Jan-2005 : Now accesses only primitive values from dataset (DG);
* 22-Feb-2005 : Override getLegendItem(int, int) to return "line" items (DG);
* 13-Apr-2005 : Fixed shape positioning bug (id = 1182062) (DG);
* 20-Apr-2005 : Use generators for legend tooltips and URLs (DG);
* 04-May-2005 : Override equals() method, renamed get/setPlotShapes() -->
* get/setShapesVisible (DG);
* 09-Jun-2005 : Updated equals() to handle GradientPaint (DG);
* 16-Jun-2005 : Fix bug (1221021) affecting stroke used for each series (DG);
*
*/
package org.jfree.chart.renderer.xy;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Shape;
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.LegendItem;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.entity.EntityCollection;
import org.jfree.chart.entity.XYItemEntity;
import org.jfree.chart.event.RendererChangeEvent;
import org.jfree.chart.labels.XYToolTipGenerator;
import org.jfree.chart.plot.CrosshairState;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.PlotRenderingInfo;
import org.jfree.chart.plot.XYPlot;
import org.jfree.data.xy.XYDataset;
import org.jfree.io.SerialUtilities;
import org.jfree.ui.RectangleEdge;
import org.jfree.util.PaintUtilities;
import org.jfree.util.PublicCloneable;
import org.jfree.util.ShapeUtilities;
/**
* A renderer for an {@link XYPlot} that highlights the differences between two
* series. The renderer expects a dataset that:
* <ul>
* <li>has exactly two series;</li>
* <li>each series has the same x-values;</li>
* <li>no <code>null</code> values;
* </ul>
*/
public class XYDifferenceRenderer extends AbstractXYItemRenderer
implements XYItemRenderer,
Cloneable,
PublicCloneable,
Serializable {
/** For serialization. */
private static final long serialVersionUID = -8447915602375584857L;
/** The paint used to highlight positive differences (y(0) > y(1)). */
private transient Paint positivePaint;
/** The paint used to highlight negative differences (y(0) < y(1)). */
private transient Paint negativePaint;
/** Display shapes at each point? */
private boolean shapesVisible;
/** The shape to display in the legend item. */
private transient Shape legendLine;
/**
* Creates a new renderer with default attributes.
*/
public XYDifferenceRenderer() {
this(Color.green, Color.red, false);
}
/**
* Creates a new renderer.
*
* @param positivePaint the highlight color for positive differences
* (<code>null</code> not permitted).
* @param negativePaint the highlight color for negative differences
* (<code>null</code> not permitted).
* @param shapes draw shapes?
*/
public XYDifferenceRenderer(Paint positivePaint, Paint negativePaint,
boolean shapes) {
if (positivePaint == null) {
throw new IllegalArgumentException(
"Null 'positivePaint' argument."
);
}
if (negativePaint == null) {
throw new IllegalArgumentException(
"Null 'negativePaint' argument."
);
}
this.positivePaint = positivePaint;
this.negativePaint = negativePaint;
this.shapesVisible = shapes;
this.legendLine = new Line2D.Double(-7.0, 0.0, 7.0, 0.0);
}
/**
* Returns the paint used to highlight positive differences.
*
* @return The paint (never <code>null</code>).
*/
public Paint getPositivePaint() {
return this.positivePaint;
}
/**
* Sets the paint used to highlight positive differences.
*
* @param paint the paint (<code>null</code> not permitted).
*/
public void setPositivePaint(Paint paint) {
if (paint == null) {
throw new IllegalArgumentException("Null 'paint' argument.");
}
this.positivePaint = paint;
notifyListeners(new RendererChangeEvent(this));
}
/**
* Returns the paint used to highlight negative differences.
*
* @return The paint (never <code>null</code>).
*/
public Paint getNegativePaint() {
return this.negativePaint;
}
/**
* Sets the paint used to highlight negative differences.
*
* @param paint the paint (<code>null</code> not permitted).
*/
public void setNegativePaint(Paint paint) {
if (paint == null) {
throw new IllegalArgumentException("Null 'paint' argument.");
}
this.negativePaint = paint;
notifyListeners(new RendererChangeEvent(this));
}
/**
* Returns a flag that controls whether or not shapes are drawn for each
* data value.
*
* @return A boolean.
*/
public boolean getShapesVisible() {
return this.shapesVisible;
}
/**
* Sets a flag that controls whether or not shapes are drawn for each
* data value.
*
* @param flag the flag.
*/
public void setShapesVisible(boolean flag) {
this.shapesVisible = flag;
notifyListeners(new RendererChangeEvent(this));
}
/**
* Returns the shape used to represent a line in the legend.
*
* @return The legend line (never <code>null</code>).
*/
public Shape getLegendLine() {
return this.legendLine;
}
/**
* Sets the shape used as a line in each legend item and sends a
* {@link RendererChangeEvent} to all registered listeners.
*
* @param line the line (<code>null</code> not permitted).
*/
public void setLegendLine(Shape line) {
if (line == null) {
throw new IllegalArgumentException("Null 'line' argument.");
}
this.legendLine = line;
notifyListeners(new RendererChangeEvent(this));
}
/**
* Initialises the renderer and returns a state object that should be
* passed to subsequent calls to the drawItem() method. This method will
* be called before the first item is rendered, giving the renderer an
* opportunity to initialise any state information it wants to maintain.
* The renderer can do nothing if it chooses.
*
* @param g2 the graphics device.
* @param dataArea the area inside the axes.
* @param plot the plot.
* @param data the data.
* @param info an optional info collection object to return data back to
* the caller.
*
* @return A state object.
*/
public XYItemRendererState initialise(Graphics2D g2,
Rectangle2D dataArea,
XYPlot plot,
XYDataset data,
PlotRenderingInfo info) {
return super.initialise(g2, dataArea, plot, data, info);
}
/**
* Returns <code>2</code>, the number of passes required by the renderer.
* The {@link XYPlot} will run through the dataset this number of times.
*
* @return The number of passes required by the renderer.
*/
public int getPassCount() {
return 2;
}
/**
* Draws the visual representation of a single data item.
*
* @param g2 the graphics device.
* @param state the renderer state.
* @param dataArea the area within which the data is being drawn.
* @param info collects information about the drawing.
* @param plot the plot (can be used to obtain standard color
* information etc).
* @param domainAxis the domain (horizontal) axis.
* @param rangeAxis the range (vertical) axis.
* @param dataset the dataset.
* @param series the series index (zero-based).
* @param item the item index (zero-based).
* @param crosshairState crosshair information for the plot
* (<code>null</code> permitted).
* @param pass the pass index.
*/
public void drawItem(Graphics2D g2,
XYItemRendererState state,
Rectangle2D dataArea,
PlotRenderingInfo info,
XYPlot plot,
ValueAxis domainAxis,
ValueAxis rangeAxis,
XYDataset dataset,
int series,
int item,
CrosshairState crosshairState,
int pass) {
if (pass == 0) {
drawItemPass0(
g2, dataArea, info, plot, domainAxis, rangeAxis, dataset,
series, item, crosshairState
);
}
else if (pass == 1) {
drawItemPass1(
g2, dataArea, info, plot, domainAxis, rangeAxis, dataset,
series, item, crosshairState
);
}
}
/**
* Draws the visual representation of a single data item, first pass.
*
* @param g2 the graphics device.
* @param dataArea the area within which the data is being drawn.
* @param info collects information about the drawing.
* @param plot the plot (can be used to obtain standard color
* information etc).
* @param domainAxis the domain (horizontal) axis.
* @param rangeAxis the range (vertical) axis.
* @param dataset the dataset.
* @param series the series index (zero-based).
* @param item the item index (zero-based).
* @param crosshairState crosshair information for the plot
* (<code>null</code> permitted).
*/
protected void drawItemPass0(Graphics2D g2,
Rectangle2D dataArea,
PlotRenderingInfo info,
XYPlot plot,
ValueAxis domainAxis,
ValueAxis rangeAxis,
XYDataset dataset,
int series,
int item,
CrosshairState crosshairState) {
if (series == 0) {
PlotOrientation orientation = plot.getOrientation();
RectangleEdge domainAxisLocation = plot.getDomainAxisEdge();
RectangleEdge rangeAxisLocation = plot.getRangeAxisEdge();
double y0 = dataset.getYValue(0, item);
double x1 = dataset.getXValue(1, item);
double y1 = dataset.getYValue(1, item);
double transY0 = rangeAxis.valueToJava2D(
y0, dataArea, rangeAxisLocation
);
double transX1 = domainAxis.valueToJava2D(
x1, dataArea, domainAxisLocation
);
double transY1 = rangeAxis.valueToJava2D(
y1, dataArea, rangeAxisLocation
);
if (item > 0) {
double prevx0 = dataset.getXValue(0, item - 1);
double prevy0 = dataset.getYValue(0, item - 1);
double prevy1 = dataset.getYValue(1, item - 1);
double prevtransX0 = domainAxis.valueToJava2D(
prevx0, dataArea, domainAxisLocation
);
double prevtransY0 = rangeAxis.valueToJava2D(
prevy0, dataArea, rangeAxisLocation
);
double prevtransY1 = rangeAxis.valueToJava2D(
prevy1, dataArea, rangeAxisLocation
);
Shape positive = getPositiveArea(
(float) prevtransX0, (float) prevtransY0,
(float) prevtransY1,
(float) transX1, (float) transY0, (float) transY1,
orientation
);
if (positive != null) {
g2.setPaint(getPositivePaint());
g2.fill(positive);
}
Shape negative = getNegativeArea(
(float) prevtransX0, (float) prevtransY0,
(float) prevtransY1,
(float) transX1, (float) transY0, (float) transY1,
orientation
);
if (negative != null) {
g2.setPaint(getNegativePaint());
g2.fill(negative);
}
}
}
}
/**
* Draws the visual representation of a single data item, second pass. In
* the second pass, the renderer draws the lines and shapes for the
* individual points in the two series.
*
* @param g2 the graphics device.
* @param dataArea the area within which the data is being drawn.
* @param info collects information about the drawing.
* @param plot the plot (can be used to obtain standard color information
* etc).
* @param domainAxis the domain (horizontal) axis.
* @param rangeAxis the range (vertical) axis.
* @param dataset the dataset.
* @param series the series index (zero-based).
* @param item the item index (zero-based).
* @param crosshairState crosshair information for the plot
* (<code>null</code> permitted).
*/
protected void drawItemPass1(Graphics2D g2,
Rectangle2D dataArea,
PlotRenderingInfo info,
XYPlot plot,
ValueAxis domainAxis,
ValueAxis rangeAxis,
XYDataset dataset,
int series,
int item,
CrosshairState crosshairState) {
Shape entityArea = null;
EntityCollection entities = null;
if (info != null) {
entities = info.getOwner().getEntityCollection();
}
Paint seriesPaint = getItemPaint(series, item);
Stroke seriesStroke = getItemStroke(series, item);
g2.setPaint(seriesPaint);
g2.setStroke(seriesStroke);
if (series == 0) {
PlotOrientation orientation = plot.getOrientation();
RectangleEdge domainAxisLocation = plot.getDomainAxisEdge();
RectangleEdge rangeAxisLocation = plot.getRangeAxisEdge();
double x0 = dataset.getXValue(0, item);
double y0 = dataset.getYValue(0, item);
double x1 = dataset.getXValue(1, item);
double y1 = dataset.getYValue(1, item);
double transX0 = domainAxis.valueToJava2D(
x0, dataArea, domainAxisLocation
);
double transY0 = rangeAxis.valueToJava2D(
y0, dataArea, rangeAxisLocation
);
double transX1 = domainAxis.valueToJava2D(
x1, dataArea, domainAxisLocation
);
double transY1 = rangeAxis.valueToJava2D(
y1, dataArea, rangeAxisLocation
);
if (item > 0) {
// get the previous data points...
double prevx0 = dataset.getXValue(0, item - 1);
double prevy0 = dataset.getYValue(0, item - 1);
double prevx1 = dataset.getXValue(1, item - 1);
double prevy1 = dataset.getYValue(1, item - 1);
double prevtransX0 = domainAxis.valueToJava2D(
prevx0, dataArea, domainAxisLocation
);
double prevtransY0 = rangeAxis.valueToJava2D(
prevy0, dataArea, rangeAxisLocation
);
double prevtransX1 = domainAxis.valueToJava2D(
prevx1, dataArea, domainAxisLocation
);
double prevtransY1 = rangeAxis.valueToJava2D(
prevy1, dataArea, rangeAxisLocation
);
Line2D line0 = null;
Line2D line1 = null;
if (orientation == PlotOrientation.HORIZONTAL) {
line0 = new Line2D.Double(
transY0, transX0, prevtransY0, prevtransX0
);
line1 = new Line2D.Double(
transY1, transX1, prevtransY1, prevtransX1
);
}
else if (orientation == PlotOrientation.VERTICAL) {
line0 = new Line2D.Double(
transX0, transY0, prevtransX0, prevtransY0
);
line1 = new Line2D.Double(
transX1, transY1, prevtransX1, prevtransY1
);
}
if (line0 != null && line0.intersects(dataArea)) {
g2.setPaint(getItemPaint(series, item));
g2.setStroke(getItemStroke(series, item));
g2.draw(line0);
}
if (line1 != null && line1.intersects(dataArea)) {
g2.setPaint(getItemPaint(1, item));
g2.setStroke(getItemStroke(1, item));
g2.draw(line1);
}
}
if (getShapesVisible()) {
Shape shape0 = getItemShape(series, item);
if (orientation == PlotOrientation.HORIZONTAL) {
shape0 = ShapeUtilities.createTranslatedShape(
shape0, transY0, transX0
);
}
else { // vertical
shape0 = ShapeUtilities.createTranslatedShape(
shape0, transX0, transY0
);
}
if (shape0.intersects(dataArea)) {
g2.setPaint(getItemPaint(series, item));
g2.fill(shape0);
}
entityArea = shape0;
// add an entity for the item...
if (entities != null) {
if (entityArea == null) {
entityArea = new Rectangle2D.Double(
transX0 - 2, transY0 - 2, 4, 4
);
}
String tip = null;
XYToolTipGenerator generator = getToolTipGenerator(
series, item
);
if (generator != null) {
tip = generator.generateToolTip(dataset, series, item);
}
String url = null;
if (getURLGenerator() != null) {
url = getURLGenerator().generateURL(
dataset, series, item
);
}
XYItemEntity entity = new XYItemEntity(
entityArea, dataset, series, item, tip, url
);
entities.add(entity);
}
Shape shape1 = getItemShape(series + 1, item);
if (orientation == PlotOrientation.HORIZONTAL) {
shape1 = ShapeUtilities.createTranslatedShape(
shape1, transY1, transX1
);
}
else { // vertical
shape1 = ShapeUtilities.createTranslatedShape(
shape1, transX1, transY1
);
}
if (shape1.intersects(dataArea)) {
g2.setPaint(getItemPaint(series + 1, item));
g2.fill(shape1);
}
entityArea = shape1;
// add an entity for the item...
if (entities != null) {
if (entityArea == null) {
entityArea = new Rectangle2D.Double(
transX1 - 2, transY1 - 2, 4, 4
);
}
String tip = null;
XYToolTipGenerator generator = getToolTipGenerator(
series, item
);
if (generator != null) {
tip = generator.generateToolTip(
dataset, series + 1, item
);
}
String url = null;
if (getURLGenerator() != null) {
url = getURLGenerator().generateURL(
dataset, series + 1, item
);
}
XYItemEntity entity = new XYItemEntity(
entityArea, dataset, series + 1, item, tip, url
);
entities.add(entity);
}
}
updateCrosshairValues(
crosshairState, x1, y1, transX1, transY1, orientation
);
}
}
/**
* Returns the positive area for a crossover point.
*
* @param x0 x coordinate.
* @param y0A y coordinate A.
* @param y0B y coordinate B.
* @param x1 x coordinate.
* @param y1A y coordinate A.
* @param y1B y coordinate B.
* @param orientation the plot orientation.
*
* @return The positive area.
*/
protected Shape getPositiveArea(float x0, float y0A, float y0B,
float x1, float y1A, float y1B,
PlotOrientation orientation) {
Shape result = null;
boolean startsNegative = (y0A >= y0B);
boolean endsNegative = (y1A >= y1B);
if (orientation == PlotOrientation.HORIZONTAL) {
startsNegative = (y0B >= y0A);
endsNegative = (y1B >= y1A);
}
if (startsNegative) { // starts negative
if (endsNegative) {
// all negative - return null
result = null;
}
else {
// changed from negative to positive
float[] p = getIntersection(x0, y0A, x1, y1A, x0, y0B, x1, y1B);
GeneralPath area = new GeneralPath();
if (orientation == PlotOrientation.HORIZONTAL) {
area.moveTo(y1A, x1);
area.lineTo(p[1], p[0]);
area.lineTo(y1B, x1);
area.closePath();
}
else if (orientation == PlotOrientation.VERTICAL) {
area.moveTo(x1, y1A);
area.lineTo(p[0], p[1]);
area.lineTo(x1, y1B);
area.closePath();
}
result = area;
}
}
else { // starts positive
if (endsNegative) {
// changed from positive to negative
float[] p = getIntersection(x0, y0A, x1, y1A, x0, y0B, x1, y1B);
GeneralPath area = new GeneralPath();
if (orientation == PlotOrientation.HORIZONTAL) {
area.moveTo(y0A, x0);
area.lineTo(p[1], p[0]);
area.lineTo(y0B, x0);
area.closePath();
}
else if (orientation == PlotOrientation.VERTICAL) {
area.moveTo(x0, y0A);
area.lineTo(p[0], p[1]);
area.lineTo(x0, y0B);
area.closePath();
}
result = area;
}
else {
GeneralPath area = new GeneralPath();
if (orientation == PlotOrientation.HORIZONTAL) {
area.moveTo(y0A, x0);
area.lineTo(y1A, x1);
area.lineTo(y1B, x1);
area.lineTo(y0B, x0);
area.closePath();
}
else if (orientation == PlotOrientation.VERTICAL) {
area.moveTo(x0, y0A);
area.lineTo(x1, y1A);
area.lineTo(x1, y1B);
area.lineTo(x0, y0B);
area.closePath();
}
result = area;
}
}
return result;
}
/**
* Returns the negative area for a cross-over section.
*
* @param x0 x coordinate.
* @param y0A y coordinate A.
* @param y0B y coordinate B.
* @param x1 x coordinate.
* @param y1A y coordinate A.
* @param y1B y coordinate B.
* @param orientation the plot orientation.
*
* @return The negative area.
*/
protected Shape getNegativeArea(float x0, float y0A, float y0B,
float x1, float y1A, float y1B,
PlotOrientation orientation) {
Shape result = null;
boolean startsNegative = (y0A >= y0B);
boolean endsNegative = (y1A >= y1B);
if (orientation == PlotOrientation.HORIZONTAL) {
startsNegative = (y0B >= y0A);
endsNegative = (y1B >= y1A);
}
if (startsNegative) { // starts negative
if (endsNegative) { // all negative
GeneralPath area = new GeneralPath();
if (orientation == PlotOrientation.HORIZONTAL) {
area.moveTo(y0A, x0);
area.lineTo(y1A, x1);
area.lineTo(y1B, x1);
area.lineTo(y0B, x0);
area.closePath();
}
else if (orientation == PlotOrientation.VERTICAL) {
area.moveTo(x0, y0A);
area.lineTo(x1, y1A);
area.lineTo(x1, y1B);
area.lineTo(x0, y0B);
area.closePath();
}
result = area;
}
else { // changed from negative to positive
float[] p = getIntersection(x0, y0A, x1, y1A, x0, y0B, x1, y1B);
GeneralPath area = new GeneralPath();
if (orientation == PlotOrientation.HORIZONTAL) {
area.moveTo(y0A, x0);
area.lineTo(p[1], p[0]);
area.lineTo(y0B, x0);
area.closePath();
}
else if (orientation == PlotOrientation.VERTICAL) {
area.moveTo(x0, y0A);
area.lineTo(p[0], p[1]);
area.lineTo(x0, y0B);
area.closePath();
}
result = area;
}
}
else {
if (endsNegative) {
// changed from positive to negative
float[] p = getIntersection(x0, y0A, x1, y1A, x0, y0B, x1, y1B);
GeneralPath area = new GeneralPath();
if (orientation == PlotOrientation.HORIZONTAL) {
area.moveTo(y1A, x1);
area.lineTo(p[1], p[0]);
area.lineTo(y1B, x1);
area.closePath();
}
else if (orientation == PlotOrientation.VERTICAL) {
area.moveTo(x1, y1A);
area.lineTo(p[0], p[1]);
area.lineTo(x1, y1B);
area.closePath();
}
result = area;
}
else {
// all negative - return null
}
}
return result;
}
/**
* Returns the intersection point of two lines.
*
* @param x1 x1
* @param y1 y1
* @param x2 x2
* @param y2 y2
* @param x3 x3
* @param y3 y3
* @param x4 x4
* @param y4 y4
*
* @return The intersection point.
*/
private float[] getIntersection(float x1, float y1, float x2, float y2,
float x3, float y3, float x4, float y4) {
float n = (x4 - x3) * (y1 - y3) - (y4 - y3) * (x1 - x3);
float d = (y4 - y3) * (x2 - x1) - (x4 - x3) * (y2 - y1);
float u = n / d;
float[] result = new float[2];
result[0] = x1 + u * (x2 - x1);
result[1] = y1 + u * (y2 - y1);
return result;
}
/**
* Returns a default legend item for the specified series. Subclasses
* should override this method to generate customised items.
*
* @param datasetIndex the dataset index (zero-based).
* @param series the series index (zero-based).
*
* @return A legend item for the series.
*/
public LegendItem getLegendItem(int datasetIndex, int series) {
LegendItem result = null;
XYPlot p = getPlot();
if (p != null) {
XYDataset dataset = p.getDataset(datasetIndex);
if (dataset != null) {
if (getItemVisible(series, 0)) {
String label = getLegendItemLabelGenerator().generateLabel(
dataset, series
);
String description = label;
String toolTipText = null;
if (getLegendItemToolTipGenerator() != null) {
toolTipText = getLegendItemToolTipGenerator().generateLabel(
dataset, series
);
}
String urlText = null;
if (getLegendItemURLGenerator() != null) {
urlText = getLegendItemURLGenerator().generateLabel(
dataset, series
);
}
Paint paint = getSeriesPaint(series);
Stroke stroke = getSeriesStroke(series);
// TODO: the following hard-coded line needs generalising
Line2D line = new Line2D.Double(-7.0, 0.0, 7.0, 0.0);
result = new LegendItem(label, description,
toolTipText, urlText, line, stroke, paint);
}
}
}
return result;
}
/**
* Tests this renderer 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 XYDifferenceRenderer)) {
return false;
}
if (!super.equals(obj)) {
return false;
}
XYDifferenceRenderer that = (XYDifferenceRenderer) obj;
if (!PaintUtilities.equal(this.positivePaint, that.positivePaint)) {
return false;
}
if (!PaintUtilities.equal(this.negativePaint, that.negativePaint)) {
return false;
}
if (this.shapesVisible != that.shapesVisible) {
return false;
}
if (!ShapeUtilities.equal(this.legendLine, that.legendLine)) {
return false;
}
return true;
}
/**
* Returns a clone of the renderer.
*
* @return A clone.
*
* @throws CloneNotSupportedException if the renderer 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.positivePaint, stream);
SerialUtilities.writePaint(this.negativePaint, stream);
SerialUtilities.writeShape(this.legendLine, 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.positivePaint = SerialUtilities.readPaint(stream);
this.negativePaint = SerialUtilities.readPaint(stream);
this.legendLine = SerialUtilities.readShape(stream);
}
}