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jfreechart example source code file (XYDifferenceRenderer.java)

This example jfreechart source code file (XYDifferenceRenderer.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - jfreechart tags/keywords

awt, double, double, geometry, io, linkedlist, linkedlist, paint, paint, rectangle2d, shape, string, util, valueaxis, valueaxis, xydataset, xydifferencerenderer, xyplot

The jfreechart XYDifferenceRenderer.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.]
 *
 * -------------------------
 * XYDifferenceRenderer.java
 * -------------------------
 * (C) Copyright 2003-2008, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   Richard West, Advanced Micro Devices, Inc. (major rewrite
 *                   of difference drawing algorithm);
 *
 * 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);
 * 20-Apr-2007 : Updated getLegendItem() for renderer change (DG);
 * 23-Apr-2007 : Rewrite of difference drawing algorithm to allow use of
 *               series with disjoint x-values (RW);
 * 04-May-2007 : Set processVisibleItemsOnly flag to false (DG);
 * 17-May-2007 : Set datasetIndex and seriesIndex in getLegendItem() (DG);
 * 18-May-2007 : Set dataset and seriesKey for LegendItem (DG);
 * 05-Nov-2007 : Draw item labels if visible (RW);
 * 17-Jun-2008 : Apply legend shape, font and paint attributes (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.util.Collections;
import java.util.LinkedList;

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.chart.urls.XYURLGenerator;
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 example shown here is generated by the
 * <code>DifferenceChartDemo1.java program included in the JFreeChart
 * demo collection:
 * <br>
* <img src="../../../../../images/XYDifferenceRendererSample.png" * alt="XYDifferenceRendererSample.png" /> */ public class XYDifferenceRenderer extends AbstractXYItemRenderer implements XYItemRenderer, PublicCloneable { /** 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; /** * 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 XYDifferenceRenderer() { this(Color.green, Color.red, false); } /** * Creates a new renderer. * * @param positivePaint the highlight color for positive differences * (<code>null not permitted). * @param negativePaint the highlight color for negative differences * (<code>null 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); this.roundXCoordinates = false; } /** * Returns the paint used to highlight positive differences. * * @return The paint (never <code>null). * * @see #setPositivePaint(Paint) */ public Paint getPositivePaint() { return this.positivePaint; } /** * Sets the paint used to highlight positive differences and sends a * {@link RendererChangeEvent} to all registered listeners. * * @param paint the paint (<code>null not permitted). * * @see #getPositivePaint() */ public void setPositivePaint(Paint paint) { if (paint == null) { throw new IllegalArgumentException("Null 'paint' argument."); } this.positivePaint = paint; fireChangeEvent(); } /** * Returns the paint used to highlight negative differences. * * @return The paint (never <code>null). * * @see #setNegativePaint(Paint) */ public Paint getNegativePaint() { return this.negativePaint; } /** * Sets the paint used to highlight negative differences. * * @param paint the paint (<code>null not permitted). * * @see #getNegativePaint() */ 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. * * @see #setShapesVisible(boolean) */ public boolean getShapesVisible() { return this.shapesVisible; } /** * Sets a flag that controls whether or not shapes are drawn for each * data value, and sends a {@link RendererChangeEvent} to all registered * listeners. * * @param flag the flag. * * @see #getShapesVisible() */ public void setShapesVisible(boolean flag) { this.shapesVisible = flag; fireChangeEvent(); } /** * Returns the shape used to represent a line in the legend. * * @return The legend line (never <code>null). * * @see #setLegendLine(Shape) */ 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 not permitted). * * @see #getLegendLine() */ public void setLegendLine(Shape line) { if (line == null) { throw new IllegalArgumentException("Null 'line' argument."); } this.legendLine = line; fireChangeEvent(); } /** * Returns the flag that controls whether or not the x-coordinates (in * Java2D space) are rounded to integer values. * * @return The flag. * * @since 1.0.4 * * @see #setRoundXCoordinates(boolean) */ public boolean getRoundXCoordinates() { return this.roundXCoordinates; } /** * Sets the flag that controls whether or not the x-coordinates (in * Java2D space) are rounded to integer values, and sends a * {@link RendererChangeEvent} to all registered listeners. * * @param round the new flag value. * * @since 1.0.4 * * @see #getRoundXCoordinates() */ public void setRoundXCoordinates(boolean round) { this.roundXCoordinates = round; fireChangeEvent(); } /** * 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) { XYItemRendererState state = super.initialise(g2, dataArea, plot, data, info); state.setProcessVisibleItemsOnly(false); return state; } /** * Returns <code>2, 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 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 x_graphics the graphics device. * @param x_dataArea the area within which the data is being drawn. * @param x_info collects information about the drawing. * @param x_plot the plot (can be used to obtain standard color * information etc). * @param x_domainAxis the domain (horizontal) axis. * @param x_rangeAxis the range (vertical) axis. * @param x_dataset the dataset. * @param x_series the series index (zero-based). * @param x_item the item index (zero-based). * @param x_crosshairState crosshair information for the plot * (<code>null permitted). */ protected void drawItemPass0(Graphics2D x_graphics, Rectangle2D x_dataArea, PlotRenderingInfo x_info, XYPlot x_plot, ValueAxis x_domainAxis, ValueAxis x_rangeAxis, XYDataset x_dataset, int x_series, int x_item, CrosshairState x_crosshairState) { if (!((0 == x_series) && (0 == x_item))) { return; } boolean b_impliedZeroSubtrahend = (1 == x_dataset.getSeriesCount()); // check if either series is a degenerate case (i.e. less than 2 points) if (isEitherSeriesDegenerate(x_dataset, b_impliedZeroSubtrahend)) { return; } // check if series are disjoint (i.e. domain-spans do not overlap) if (!b_impliedZeroSubtrahend && areSeriesDisjoint(x_dataset)) { return; } // polygon definitions LinkedList l_minuendXs = new LinkedList(); LinkedList l_minuendYs = new LinkedList(); LinkedList l_subtrahendXs = new LinkedList(); LinkedList l_subtrahendYs = new LinkedList(); LinkedList l_polygonXs = new LinkedList(); LinkedList l_polygonYs = new LinkedList(); // state int l_minuendItem = 0; int l_minuendItemCount = x_dataset.getItemCount(0); Double l_minuendCurX = null; Double l_minuendNextX = null; Double l_minuendCurY = null; Double l_minuendNextY = null; double l_minuendMaxY = Double.NEGATIVE_INFINITY; double l_minuendMinY = Double.POSITIVE_INFINITY; int l_subtrahendItem = 0; int l_subtrahendItemCount = 0; // actual value set below Double l_subtrahendCurX = null; Double l_subtrahendNextX = null; Double l_subtrahendCurY = null; Double l_subtrahendNextY = null; double l_subtrahendMaxY = Double.NEGATIVE_INFINITY; double l_subtrahendMinY = Double.POSITIVE_INFINITY; // if a subtrahend is not specified, assume it is zero if (b_impliedZeroSubtrahend) { l_subtrahendItem = 0; l_subtrahendItemCount = 2; l_subtrahendCurX = new Double(x_dataset.getXValue(0, 0)); l_subtrahendNextX = new Double(x_dataset.getXValue(0, (l_minuendItemCount - 1))); l_subtrahendCurY = new Double(0.0); l_subtrahendNextY = new Double(0.0); l_subtrahendMaxY = 0.0; l_subtrahendMinY = 0.0; l_subtrahendXs.add(l_subtrahendCurX); l_subtrahendYs.add(l_subtrahendCurY); } else { l_subtrahendItemCount = x_dataset.getItemCount(1); } boolean b_minuendDone = false; boolean b_minuendAdvanced = true; boolean b_minuendAtIntersect = false; boolean b_minuendFastForward = false; boolean b_subtrahendDone = false; boolean b_subtrahendAdvanced = true; boolean b_subtrahendAtIntersect = false; boolean b_subtrahendFastForward = false; boolean b_colinear = false; boolean b_positive; // coordinate pairs double l_x1 = 0.0, l_y1 = 0.0; // current minuend point double l_x2 = 0.0, l_y2 = 0.0; // next minuend point double l_x3 = 0.0, l_y3 = 0.0; // current subtrahend point double l_x4 = 0.0, l_y4 = 0.0; // next subtrahend point // fast-forward through leading tails boolean b_fastForwardDone = false; while (!b_fastForwardDone) { // get the x and y coordinates l_x1 = x_dataset.getXValue(0, l_minuendItem); l_y1 = x_dataset.getYValue(0, l_minuendItem); l_x2 = x_dataset.getXValue(0, l_minuendItem + 1); l_y2 = x_dataset.getYValue(0, l_minuendItem + 1); l_minuendCurX = new Double(l_x1); l_minuendCurY = new Double(l_y1); l_minuendNextX = new Double(l_x2); l_minuendNextY = new Double(l_y2); if (b_impliedZeroSubtrahend) { l_x3 = l_subtrahendCurX.doubleValue(); l_y3 = l_subtrahendCurY.doubleValue(); l_x4 = l_subtrahendNextX.doubleValue(); l_y4 = l_subtrahendNextY.doubleValue(); } else { l_x3 = x_dataset.getXValue(1, l_subtrahendItem); l_y3 = x_dataset.getYValue(1, l_subtrahendItem); l_x4 = x_dataset.getXValue(1, l_subtrahendItem + 1); l_y4 = x_dataset.getYValue(1, l_subtrahendItem + 1); l_subtrahendCurX = new Double(l_x3); l_subtrahendCurY = new Double(l_y3); l_subtrahendNextX = new Double(l_x4); l_subtrahendNextY = new Double(l_y4); } if (l_x2 <= l_x3) { // minuend needs to be fast forwarded l_minuendItem++; b_minuendFastForward = true; continue; } if (l_x4 <= l_x1) { // subtrahend needs to be fast forwarded l_subtrahendItem++; b_subtrahendFastForward = true; continue; } // check if initial polygon needs to be clipped if ((l_x3 < l_x1) && (l_x1 < l_x4)) { // project onto subtrahend double l_slope = (l_y4 - l_y3) / (l_x4 - l_x3); l_subtrahendCurX = l_minuendCurX; l_subtrahendCurY = new Double((l_slope * l_x1) + (l_y3 - (l_slope * l_x3))); l_subtrahendXs.add(l_subtrahendCurX); l_subtrahendYs.add(l_subtrahendCurY); } if ((l_x1 < l_x3) && (l_x3 < l_x2)) { // project onto minuend double l_slope = (l_y2 - l_y1) / (l_x2 - l_x1); l_minuendCurX = l_subtrahendCurX; l_minuendCurY = new Double((l_slope * l_x3) + (l_y1 - (l_slope * l_x1))); l_minuendXs.add(l_minuendCurX); l_minuendYs.add(l_minuendCurY); } l_minuendMaxY = l_minuendCurY.doubleValue(); l_minuendMinY = l_minuendCurY.doubleValue(); l_subtrahendMaxY = l_subtrahendCurY.doubleValue(); l_subtrahendMinY = l_subtrahendCurY.doubleValue(); b_fastForwardDone = true; } // start of algorithm while (!b_minuendDone && !b_subtrahendDone) { if (!b_minuendDone && !b_minuendFastForward && b_minuendAdvanced) { l_x1 = x_dataset.getXValue(0, l_minuendItem); l_y1 = x_dataset.getYValue(0, l_minuendItem); l_minuendCurX = new Double(l_x1); l_minuendCurY = new Double(l_y1); if (!b_minuendAtIntersect) { l_minuendXs.add(l_minuendCurX); l_minuendYs.add(l_minuendCurY); } l_minuendMaxY = Math.max(l_minuendMaxY, l_y1); l_minuendMinY = Math.min(l_minuendMinY, l_y1); l_x2 = x_dataset.getXValue(0, l_minuendItem + 1); l_y2 = x_dataset.getYValue(0, l_minuendItem + 1); l_minuendNextX = new Double(l_x2); l_minuendNextY = new Double(l_y2); } // never updated the subtrahend if it is implied to be zero if (!b_impliedZeroSubtrahend && !b_subtrahendDone && !b_subtrahendFastForward && b_subtrahendAdvanced) { l_x3 = x_dataset.getXValue(1, l_subtrahendItem); l_y3 = x_dataset.getYValue(1, l_subtrahendItem); l_subtrahendCurX = new Double(l_x3); l_subtrahendCurY = new Double(l_y3); if (!b_subtrahendAtIntersect) { l_subtrahendXs.add(l_subtrahendCurX); l_subtrahendYs.add(l_subtrahendCurY); } l_subtrahendMaxY = Math.max(l_subtrahendMaxY, l_y3); l_subtrahendMinY = Math.min(l_subtrahendMinY, l_y3); l_x4 = x_dataset.getXValue(1, l_subtrahendItem + 1); l_y4 = x_dataset.getYValue(1, l_subtrahendItem + 1); l_subtrahendNextX = new Double(l_x4); l_subtrahendNextY = new Double(l_y4); } // deassert b_*FastForward (only matters for 1st time through loop) b_minuendFastForward = false; b_subtrahendFastForward = false; Double l_intersectX = null; Double l_intersectY = null; boolean b_intersect = false; b_minuendAtIntersect = false; b_subtrahendAtIntersect = false; // check for intersect if ((l_x2 == l_x4) && (l_y2 == l_y4)) { // check if line segments are colinear if ((l_x1 == l_x3) && (l_y1 == l_y3)) { b_colinear = true; } else { // the intersect is at the next point for both the minuend // and subtrahend l_intersectX = new Double(l_x2); l_intersectY = new Double(l_y2); b_intersect = true; b_minuendAtIntersect = true; b_subtrahendAtIntersect = true; } } else { // compute common denominator double l_denominator = ((l_y4 - l_y3) * (l_x2 - l_x1)) - ((l_x4 - l_x3) * (l_y2 - l_y1)); // compute common deltas double l_deltaY = l_y1 - l_y3; double l_deltaX = l_x1 - l_x3; // compute numerators double l_numeratorA = ((l_x4 - l_x3) * l_deltaY) - ((l_y4 - l_y3) * l_deltaX); double l_numeratorB = ((l_x2 - l_x1) * l_deltaY) - ((l_y2 - l_y1) * l_deltaX); // check if line segments are colinear if ((0 == l_numeratorA) && (0 == l_numeratorB) && (0 == l_denominator)) { b_colinear = true; } else { // check if previously colinear if (b_colinear) { // clear colinear points and flag l_minuendXs.clear(); l_minuendYs.clear(); l_subtrahendXs.clear(); l_subtrahendYs.clear(); l_polygonXs.clear(); l_polygonYs.clear(); b_colinear = false; // set new starting point for the polygon boolean b_useMinuend = ((l_x3 <= l_x1) && (l_x1 <= l_x4)); l_polygonXs.add(b_useMinuend ? l_minuendCurX : l_subtrahendCurX); l_polygonYs.add(b_useMinuend ? l_minuendCurY : l_subtrahendCurY); } // compute slope components double l_slopeA = l_numeratorA / l_denominator; double l_slopeB = l_numeratorB / l_denominator; // check if the line segments intersect if ((0 < l_slopeA) && (l_slopeA <= 1) && (0 < l_slopeB) && (l_slopeB <= 1)) { // compute the point of intersection double l_xi = l_x1 + (l_slopeA * (l_x2 - l_x1)); double l_yi = l_y1 + (l_slopeA * (l_y2 - l_y1)); l_intersectX = new Double(l_xi); l_intersectY = new Double(l_yi); b_intersect = true; b_minuendAtIntersect = ((l_xi == l_x2) && (l_yi == l_y2)); b_subtrahendAtIntersect = ((l_xi == l_x4) && (l_yi == l_y4)); // advance minuend and subtrahend to intesect l_minuendCurX = l_intersectX; l_minuendCurY = l_intersectY; l_subtrahendCurX = l_intersectX; l_subtrahendCurY = l_intersectY; } } } if (b_intersect) { // create the polygon // add the minuend's points to polygon l_polygonXs.addAll(l_minuendXs); l_polygonYs.addAll(l_minuendYs); // add intersection point to the polygon l_polygonXs.add(l_intersectX); l_polygonYs.add(l_intersectY); // add the subtrahend's points to the polygon in reverse Collections.reverse(l_subtrahendXs); Collections.reverse(l_subtrahendYs); l_polygonXs.addAll(l_subtrahendXs); l_polygonYs.addAll(l_subtrahendYs); // create an actual polygon b_positive = (l_subtrahendMaxY <= l_minuendMaxY) && (l_subtrahendMinY <= l_minuendMinY); createPolygon(x_graphics, x_dataArea, x_plot, x_domainAxis, x_rangeAxis, b_positive, l_polygonXs, l_polygonYs); // clear the point vectors l_minuendXs.clear(); l_minuendYs.clear(); l_subtrahendXs.clear(); l_subtrahendYs.clear(); l_polygonXs.clear(); l_polygonYs.clear(); // set the maxY and minY values to intersect y-value double l_y = l_intersectY.doubleValue(); l_minuendMaxY = l_y; l_subtrahendMaxY = l_y; l_minuendMinY = l_y; l_subtrahendMinY = l_y; // add interection point to new polygon l_polygonXs.add(l_intersectX); l_polygonYs.add(l_intersectY); } // advance the minuend if needed if (l_x2 <= l_x4) { l_minuendItem++; b_minuendAdvanced = true; } else { b_minuendAdvanced = false; } // advance the subtrahend if needed if (l_x4 <= l_x2) { l_subtrahendItem++; b_subtrahendAdvanced = true; } else { b_subtrahendAdvanced = false; } b_minuendDone = (l_minuendItem == (l_minuendItemCount - 1)); b_subtrahendDone = (l_subtrahendItem == (l_subtrahendItemCount - 1)); } // check if the final polygon needs to be clipped if (b_minuendDone && (l_x3 < l_x2) && (l_x2 < l_x4)) { // project onto subtrahend double l_slope = (l_y4 - l_y3) / (l_x4 - l_x3); l_subtrahendNextX = l_minuendNextX; l_subtrahendNextY = new Double((l_slope * l_x2) + (l_y3 - (l_slope * l_x3))); } if (b_subtrahendDone && (l_x1 < l_x4) && (l_x4 < l_x2)) { // project onto minuend double l_slope = (l_y2 - l_y1) / (l_x2 - l_x1); l_minuendNextX = l_subtrahendNextX; l_minuendNextY = new Double((l_slope * l_x4) + (l_y1 - (l_slope * l_x1))); } // consider last point of minuend and subtrahend for determining // positivity l_minuendMaxY = Math.max(l_minuendMaxY, l_minuendNextY.doubleValue()); l_subtrahendMaxY = Math.max(l_subtrahendMaxY, l_subtrahendNextY.doubleValue()); l_minuendMinY = Math.min(l_minuendMinY, l_minuendNextY.doubleValue()); l_subtrahendMinY = Math.min(l_subtrahendMinY, l_subtrahendNextY.doubleValue()); // add the last point of the minuned and subtrahend l_minuendXs.add(l_minuendNextX); l_minuendYs.add(l_minuendNextY); l_subtrahendXs.add(l_subtrahendNextX); l_subtrahendYs.add(l_subtrahendNextY); // create the polygon // add the minuend's points to polygon l_polygonXs.addAll(l_minuendXs); l_polygonYs.addAll(l_minuendYs); // add the subtrahend's points to the polygon in reverse Collections.reverse(l_subtrahendXs); Collections.reverse(l_subtrahendYs); l_polygonXs.addAll(l_subtrahendXs); l_polygonYs.addAll(l_subtrahendYs); // create an actual polygon b_positive = (l_subtrahendMaxY <= l_minuendMaxY) && (l_subtrahendMinY <= l_minuendMinY); createPolygon(x_graphics, x_dataArea, x_plot, x_domainAxis, x_rangeAxis, b_positive, l_polygonXs, l_polygonYs); } /** * 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 x_graphics the graphics device. * @param x_dataArea the area within which the data is being drawn. * @param x_info collects information about the drawing. * @param x_plot the plot (can be used to obtain standard color * information etc). * @param x_domainAxis the domain (horizontal) axis. * @param x_rangeAxis the range (vertical) axis. * @param x_dataset the dataset. * @param x_series the series index (zero-based). * @param x_item the item index (zero-based). * @param x_crosshairState crosshair information for the plot * (<code>null permitted). */ protected void drawItemPass1(Graphics2D x_graphics, Rectangle2D x_dataArea, PlotRenderingInfo x_info, XYPlot x_plot, ValueAxis x_domainAxis, ValueAxis x_rangeAxis, XYDataset x_dataset, int x_series, int x_item, CrosshairState x_crosshairState) { Shape l_entityArea = null; EntityCollection l_entities = null; if (null != x_info) { l_entities = x_info.getOwner().getEntityCollection(); } Paint l_seriesPaint = getItemPaint(x_series, x_item); Stroke l_seriesStroke = getItemStroke(x_series, x_item); x_graphics.setPaint(l_seriesPaint); x_graphics.setStroke(l_seriesStroke); PlotOrientation l_orientation = x_plot.getOrientation(); RectangleEdge l_domainAxisLocation = x_plot.getDomainAxisEdge(); RectangleEdge l_rangeAxisLocation = x_plot.getRangeAxisEdge(); double l_x0 = x_dataset.getXValue(x_series, x_item); double l_y0 = x_dataset.getYValue(x_series, x_item); double l_x1 = x_domainAxis.valueToJava2D(l_x0, x_dataArea, l_domainAxisLocation); double l_y1 = x_rangeAxis.valueToJava2D(l_y0, x_dataArea, l_rangeAxisLocation); if (getShapesVisible()) { Shape l_shape = getItemShape(x_series, x_item); if (l_orientation == PlotOrientation.HORIZONTAL) { l_shape = ShapeUtilities.createTranslatedShape(l_shape, l_y1, l_x1); } else { l_shape = ShapeUtilities.createTranslatedShape(l_shape, l_x1, l_y1); } if (l_shape.intersects(x_dataArea)) { x_graphics.setPaint(getItemPaint(x_series, x_item)); x_graphics.fill(l_shape); } l_entityArea = l_shape; } // add an entity for the item... if (null != l_entities) { if (null == l_entityArea) { l_entityArea = new Rectangle2D.Double((l_x1 - 2), (l_y1 - 2), 4, 4); } String l_tip = null; XYToolTipGenerator l_tipGenerator = getToolTipGenerator(x_series, x_item); if (null != l_tipGenerator) { l_tip = l_tipGenerator.generateToolTip(x_dataset, x_series, x_item); } String l_url = null; XYURLGenerator l_urlGenerator = getURLGenerator(); if (null != l_urlGenerator) { l_url = l_urlGenerator.generateURL(x_dataset, x_series, x_item); } XYItemEntity l_entity = new XYItemEntity(l_entityArea, x_dataset, x_series, x_item, l_tip, l_url); l_entities.add(l_entity); } // draw the item label if there is one... if (isItemLabelVisible(x_series, x_item)) { drawItemLabel(x_graphics, l_orientation, x_dataset, x_series, x_item, l_x1, l_y1, (l_y1 < 0.0)); } int l_domainAxisIndex = x_plot.getDomainAxisIndex(x_domainAxis); int l_rangeAxisIndex = x_plot.getRangeAxisIndex(x_rangeAxis); updateCrosshairValues(x_crosshairState, l_x0, l_y0, l_domainAxisIndex, l_rangeAxisIndex, l_x1, l_y1, l_orientation); if (0 == x_item) { return; } double l_x2 = x_domainAxis.valueToJava2D(x_dataset.getXValue(x_series, (x_item - 1)), x_dataArea, l_domainAxisLocation); double l_y2 = x_rangeAxis.valueToJava2D(x_dataset.getYValue(x_series, (x_item - 1)), x_dataArea, l_rangeAxisLocation); Line2D l_line = null; if (PlotOrientation.HORIZONTAL == l_orientation) { l_line = new Line2D.Double(l_y1, l_x1, l_y2, l_x2); } else if (PlotOrientation.VERTICAL == l_orientation) { l_line = new Line2D.Double(l_x1, l_y1, l_x2, l_y2); } if ((null != l_line) && l_line.intersects(x_dataArea)) { x_graphics.setPaint(getItemPaint(x_series, x_item)); x_graphics.setStroke(getItemStroke(x_series, x_item)); x_graphics.draw(l_line); } } /** * Determines if a dataset is degenerate. A degenerate dataset is a * dataset where either series has less than two (2) points. * * @param x_dataset the dataset. * @param x_impliedZeroSubtrahend if false, do not check the subtrahend * * @return true if the dataset is degenerate. */ private boolean isEitherSeriesDegenerate(XYDataset x_dataset, boolean x_impliedZeroSubtrahend) { if (x_impliedZeroSubtrahend) { return (x_dataset.getItemCount(0) < 2); } return ((x_dataset.getItemCount(0) < 2) || (x_dataset.getItemCount(1) < 2)); } /** * Determines if the two (2) series are disjoint. * Disjoint series do not overlap in the domain space. * * @param x_dataset the dataset. * * @return true if the dataset is degenerate. */ private boolean areSeriesDisjoint(XYDataset x_dataset) { int l_minuendItemCount = x_dataset.getItemCount(0); double l_minuendFirst = x_dataset.getXValue(0, 0); double l_minuendLast = x_dataset.getXValue(0, l_minuendItemCount - 1); int l_subtrahendItemCount = x_dataset.getItemCount(1); double l_subtrahendFirst = x_dataset.getXValue(1, 0); double l_subtrahendLast = x_dataset.getXValue(1, l_subtrahendItemCount - 1); return ((l_minuendLast < l_subtrahendFirst) || (l_subtrahendLast < l_minuendFirst)); } /** * Draws the visual representation of a polygon * * @param x_graphics the graphics device. * @param x_dataArea the area within which the data is being drawn. * @param x_plot the plot (can be used to obtain standard color * information etc). * @param x_domainAxis the domain (horizontal) axis. * @param x_rangeAxis the range (vertical) axis. * @param x_positive indicates if the polygon is positive (true) or * negative (false). * @param x_xValues a linked list of the x values (expects values to be * of type Double). * @param x_yValues a linked list of the y values (expects values to be * of type Double). */ private void createPolygon (Graphics2D x_graphics, Rectangle2D x_dataArea, XYPlot x_plot, ValueAxis x_domainAxis, ValueAxis x_rangeAxis, boolean x_positive, LinkedList x_xValues, LinkedList x_yValues) { PlotOrientation l_orientation = x_plot.getOrientation(); RectangleEdge l_domainAxisLocation = x_plot.getDomainAxisEdge(); RectangleEdge l_rangeAxisLocation = x_plot.getRangeAxisEdge(); Object[] l_xValues = x_xValues.toArray(); Object[] l_yValues = x_yValues.toArray(); GeneralPath l_path = new GeneralPath(); if (PlotOrientation.VERTICAL == l_orientation) { double l_x = x_domainAxis.valueToJava2D(( (Double) l_xValues[0]).doubleValue(), x_dataArea, l_domainAxisLocation); if (this.roundXCoordinates) { l_x = Math.rint(l_x); } double l_y = x_rangeAxis.valueToJava2D(( (Double) l_yValues[0]).doubleValue(), x_dataArea, l_rangeAxisLocation); l_path.moveTo((float) l_x, (float) l_y); for (int i = 1; i < l_xValues.length; i++) { l_x = x_domainAxis.valueToJava2D(( (Double) l_xValues[i]).doubleValue(), x_dataArea, l_domainAxisLocation); if (this.roundXCoordinates) { l_x = Math.rint(l_x); } l_y = x_rangeAxis.valueToJava2D(( (Double) l_yValues[i]).doubleValue(), x_dataArea, l_rangeAxisLocation); l_path.lineTo((float) l_x, (float) l_y); } l_path.closePath(); } else { double l_x = x_domainAxis.valueToJava2D(( (Double) l_xValues[0]).doubleValue(), x_dataArea, l_domainAxisLocation); if (this.roundXCoordinates) { l_x = Math.rint(l_x); } double l_y = x_rangeAxis.valueToJava2D(( (Double) l_yValues[0]).doubleValue(), x_dataArea, l_rangeAxisLocation); l_path.moveTo((float) l_y, (float) l_x); for (int i = 1; i < l_xValues.length; i++) { l_x = x_domainAxis.valueToJava2D(( (Double) l_xValues[i]).doubleValue(), x_dataArea, l_domainAxisLocation); if (this.roundXCoordinates) { l_x = Math.rint(l_x); } l_y = x_rangeAxis.valueToJava2D(( (Double) l_yValues[i]).doubleValue(), x_dataArea, l_rangeAxisLocation); l_path.lineTo((float) l_y, (float) l_x); } l_path.closePath(); } if (l_path.intersects(x_dataArea)) { x_graphics.setPaint(x_positive ? getPositivePaint() : getNegativePaint()); x_graphics.fill(l_path); } } /** * 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 = lookupSeriesPaint(series); Stroke stroke = lookupSeriesStroke(series); Shape line = getLegendLine(); result = new LegendItem(label, description, toolTipText, urlText, line, stroke, paint); result.setLabelFont(lookupLegendTextFont(series)); Paint labelPaint = lookupLegendTextPaint(series); if (labelPaint != null) { result.setLabelPaint(labelPaint); } result.setDataset(dataset); result.setDatasetIndex(datasetIndex); result.setSeriesKey(dataset.getSeriesKey(series)); result.setSeriesIndex(series); } } } return result; } /** * Tests this renderer 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 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; } if (this.roundXCoordinates != that.roundXCoordinates) { 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 { XYDifferenceRenderer clone = (XYDifferenceRenderer) super.clone(); clone.legendLine = ShapeUtilities.clone(this.legendLine); return 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); } }

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