The gradientpainttransformer should be able to be added to most of the renderers that actually fill in an area, it's in BarRender already.
Here's my XYDifferenceRendererFill, it makes sort of a hybrid between a difference chart and an area chart. I've been playing around w/ different ways of moving the gradient points to make up, down or bouncing motions, but the one that everyone seems to like was an accident using Math.abs() that makes a fractal pattern.
Code: Select all
/* ===========================================================
* 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.]
*
* -------------------------
* XYDifferenceRenderer.java
* -------------------------
* (C) Copyright 2003-2007, by Object Refinery Limited.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): Christian W. Zuckschwerdt;
*
* $Id: XYDifferenceRenderer.java,v 1.12.2.10 2007/03/08 17:22:53 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);
* ------------- JFREECHART 1.0.x ---------------------------------------------
* 24-Jan-2007 : Added flag to allow rounding of x-coordinates, and fixed
* bug in clone() (DG);
* 05-Feb-2007 : Added an extra call to updateCrosshairValues() in
* drawItemPass1(), to fix bug 1564967 (DG);
* 06-Feb-2007 : Fixed bug 1086307, crosshairs with multiple axes (DG);
* 08-Mar-2007 : Fixed entity generation (DG);
*
*/
package com.actsolar.ui.util;
import java.awt.Color;
import java.awt.GradientPaint;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Shape;
import java.awt.geom.GeneralPath;
import java.awt.geom.Line2D;
import java.awt.geom.Rectangle2D;
import java.io.Serializable;
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.chart.renderer.xy.XYDifferenceRenderer;
import org.jfree.chart.renderer.xy.XYItemRenderer;
import org.jfree.data.xy.XYDataset;
import org.jfree.ui.GradientPaintTransformer;
import org.jfree.ui.RectangleEdge;
import org.jfree.ui.StandardGradientPaintTransformer;
import org.jfree.util.PublicCloneable;
/**
* 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 XYDifferenceRendererFill extends XYDifferenceRenderer
implements XYItemRenderer,
Cloneable,
PublicCloneable,
Serializable {
/** For serialization. */
private static final long serialVersionUID = -8447915602375584857L;
/**
* Fill in space below difference area w/ opposite color
* 1 Fill below negative, 2 fill below positive
*/
private int fillBelow = 1;
/**
* An optional class used to transform gradient paint objects
*/
private GradientPaintTransformer gradientPaintTransformer;
/**
* This flag controls whether or not the x-coordinates (in Java2D space)
* are rounded to integers. When set to true, this can avoid the vertical
* striping that anti-aliasing can generate. However, the rounding may not
* be appropriate for output in high resolution formats (for example,
* vector graphics formats such as SVG and PDF).
*
* @since 1.0.4
*/
private boolean roundXCoordinates;
/**
* Creates a new renderer with default attributes.
*/
public XYDifferenceRendererFill() {
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 XYDifferenceRendererFill(Paint positivePaint, Paint negativePaint,
boolean shapes) {
if (positivePaint == null) {
throw new IllegalArgumentException(
"Null 'positivePaint' argument.");
}
if (negativePaint == null) {
throw new IllegalArgumentException(
"Null 'negativePaint' argument.");
}
super.setPositivePaint(positivePaint);
super.setNegativePaint(negativePaint);
super.setShapesVisible(shapes);
super.setLegendLine(new Line2D.Double(-7.0, 0.0, 7.0, 0.0));
super.setRoundXCoordinates(false);
this.gradientPaintTransformer = new StandardGradientPaintTransformer();
}
/**
* Returns the flag that controls whether or not the area below the difference
* area is filled in w/ the opposing color
*
* @return The flag.
*
* @since 1.0.4
* afoss
*
* @see #setFillBelow(boolean)
*/
public int getFillBelow() {
return this.fillBelow;
}
/**
* Sets the flag that controls whether or not the area below the difference
* area is filled in w/ the opposing color
* {@link RendererChangeEvent} to all registered listeners.
*
* @param round the new flag value.
*
* @since 1.0.4
* afoss ?is this really necessary, if you don't want fillbelow, just use XYDifferenceRenderer?
*
* @see #getFillBelow()
*/
public void setFillBelow(int fill) {
this.fillBelow = fill;
notifyListeners(new RendererChangeEvent(this));
}
/**
* Returns the gradient paint transformer
*
* @return A transformer (<code>null</code> possible).
*
* @see #setGradientPaintTransformer(GradientPaintTransformer)
*/
public GradientPaintTransformer getGradientPaintTransformer() {
return this.gradientPaintTransformer;
}
/**
* Sets the gradient paint transformer and sends a
* {@link RendererChangeEvent} to all registered listeners.
*
* @param transformer the transformer (<code>null</code> permitted).
*
* @see #getGradientPaintTransformer()
*/
public void setGradientPaintTransformer(
GradientPaintTransformer transformer) {
this.gradientPaintTransformer = transformer;
notifyListeners(new RendererChangeEvent(this));
}
/**
* 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) {
EntityCollection entities = null;
Shape positive = null;
Shape negative = null;
if (info != null) {
entities = info.getOwner().getEntityCollection();
}
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(0, item);
double y1 = rangeAxis.getLowerBound();
try {
if (dataset.getSeriesCount() > 1) {
x1 = dataset.getXValue(1, item);
y1 = dataset.getYValue(1, item);
}
} catch( Exception e ) {
// If the series' have a different number of elements, we come here.
// Allow the circumstance by not doing anything rash.
return;
}
if( Double.isNaN(y0)) return;
if( Double.isNaN(x1)) return;
if( Double.isNaN(y1)) return;
double transY0 = rangeAxis.valueToJava2D(y0, dataArea,
rangeAxisLocation);
double transX1 = domainAxis.valueToJava2D(x1, dataArea,
domainAxisLocation);
double trans0 = rangeAxis.valueToJava2D(0, dataArea,
rangeAxisLocation);
if (this.roundXCoordinates) {
transX1 = Math.rint(transX1);
}
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 = rangeAxis.getLowerBound();
if (dataset.getSeriesCount() > 1)
prevy1 = dataset.getYValue(1, item - 1);
if( Double.isNaN(prevx0)) return;
if( Double.isNaN(prevy0)) return;
if( Double.isNaN(prevy1)) return;
double prevtransX0 = domainAxis.valueToJava2D(prevx0, dataArea,
domainAxisLocation);
if (this.roundXCoordinates) {
prevtransX0 = Math.rint(prevtransX0);
}
double prevtransY0 = rangeAxis.valueToJava2D(prevy0, dataArea,
rangeAxisLocation);
double prevtransY1 = rangeAxis.valueToJava2D(prevy1, dataArea,
rangeAxisLocation);
positive = getPositiveArea((float) prevtransX0,
(float) prevtransY0, (float) prevtransY1,
(float) transX1, (float) transY0, (float) transY1,
orientation);
if (positive != null) {
Paint positivePaint = getPositivePaint();
if (getGradientPaintTransformer()
!= null && positivePaint instanceof GradientPaint) {
GradientPaint gp = (GradientPaint) positivePaint;
positivePaint = getGradientPaintTransformer().transform(gp, positive);
}
g2.setPaint(positivePaint);
g2.fill(positive);
if(fillBelow > 0) {
negative = getNegativeArea(
(float) prevtransX0, (float) trans0, (float) prevtransY1,
(float) transX1, (float) trans0, (float) transY1,
orientation);
if (negative != null) {
Paint negativePaint = getNegativePaint();
/* Fill in space w/ positive paint */
/*
if (fillBelow > 1 ) {
negativePaint = getPositivePaint();
}
*/
if (getGradientPaintTransformer()
!= null && negativePaint instanceof GradientPaint) {
GradientPaint gp = (GradientPaint) negativePaint;
negativePaint = getGradientPaintTransformer().transform(gp, negative);
}
g2.setPaint(negativePaint);
g2.fill(negative);
}
}
} else {
negative = getNegativeArea((float) prevtransX0,
(float) prevtransY0, (float) prevtransY1,
(float) transX1, (float) transY0, (float) transY1,
orientation);
if (negative != null) {
Paint negativePaint = getNegativePaint();
if (getGradientPaintTransformer()
!= null && negativePaint instanceof GradientPaint) {
GradientPaint gp = (GradientPaint) negativePaint;
negativePaint = getGradientPaintTransformer().transform(gp, negative);
}
g2.setPaint(negativePaint);
g2.fill(negative);
if(fillBelow > 0) {
positive = getPositiveArea(
(float) prevtransX0, (float) prevtransY0, (float) trans0,
(float) transX1, (float) transY0, (float) trans0,
orientation);
if (positive != null) {
Paint positivePaint = getPositivePaint();
if(fillBelow > 1)
positivePaint = getNegativePaint();
if (getGradientPaintTransformer()
!= null && positivePaint instanceof GradientPaint) {
GradientPaint gp = (GradientPaint) positivePaint;
positivePaint = getGradientPaintTransformer().transform(gp, positive);
}
g2.setPaint(positivePaint);
g2.fill(positive);
}
}
}
}
if (entities != null) {
if (positive != null) {
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(positive, dataset,
series, item, tip, url);
entities.add(entity);
}
if (negative != null && dataset.getSeriesCount() > 1 ) {
String tip=null;
XYToolTipGenerator generator = getToolTipGenerator(series+1,
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(negative, dataset,
series+1, item, tip, url);
entities.add(entity);
}
}
}
}
}
/**
* 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;
}
}