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jfreechart example source code file (StackedXYBarRenderer.java)

This example jfreechart source code file (StackedXYBarRenderer.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, geometry, intervalxydataset, intervalxydataset, plotrenderinginfo, rectangle2d, rectangleedge, rectangleedge, stackedxybarrenderer, stackedxybarrenderer, tablexydataset, tablexydataset, valueaxis, xydataset, xyitemrendererstate, xyplot

The jfreechart StackedXYBarRenderer.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.]
 *
 * -------------------------
 * StackedXYBarRenderer.java
 * -------------------------
 * (C) Copyright 2004-2008, by Andreas Schroeder and Contributors.
 *
 * Original Author:  Andreas Schroeder;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * Changes
 * -------
 * 01-Apr-2004 : Version 1 (AS);
 * 15-Jul-2004 : Switched getX() with getXValue() and getY() with
 *               getYValue() (DG);
 * 15-Aug-2004 : Added drawBarOutline to control draw/don't-draw bar
 *               outlines (BN);
 * 10-Sep-2004 : drawBarOutline attribute is now inherited from XYBarRenderer
 *               and double primitives are retrieved from the dataset rather
 *               than Number objects (DG);
 * 07-Jan-2005 : Updated for method name change in DatasetUtilities (DG);
 * 25-Jan-2005 : Modified to handle negative values correctly (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 06-Dec-2006 : Added support for GradientPaint (DG);
 * 15-Mar-2007 : Added renderAsPercentages option (DG);
 * 24-Jun-2008 : Added new barPainter mechanism (DG);
 * 23-Sep-2008 : Check shadow visibility before drawing shadow (DG);
 *
 */

package org.jfree.chart.renderer.xy;

import java.awt.Graphics2D;
import java.awt.geom.Rectangle2D;

import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.entity.EntityCollection;
import org.jfree.chart.event.RendererChangeEvent;
import org.jfree.chart.labels.ItemLabelAnchor;
import org.jfree.chart.labels.ItemLabelPosition;
import org.jfree.chart.labels.XYItemLabelGenerator;
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.Range;
import org.jfree.data.general.DatasetUtilities;
import org.jfree.data.xy.IntervalXYDataset;
import org.jfree.data.xy.TableXYDataset;
import org.jfree.data.xy.XYDataset;
import org.jfree.ui.RectangleEdge;
import org.jfree.ui.TextAnchor;

/**
 * A bar renderer that displays the series items stacked.
 * The dataset used together with this renderer must be a
 * {@link org.jfree.data.xy.IntervalXYDataset} and a
 * {@link org.jfree.data.xy.TableXYDataset}. For example, the
 * dataset class {@link org.jfree.data.xy.CategoryTableXYDataset}
 * implements both interfaces.
 *
 * The example shown here is generated by the
 * <code>StackedXYBarChartDemo2.java program included in the
 * JFreeChart demo collection:
 * <br>
* <img src="../../../../../images/StackedXYBarRendererSample.png" * alt="StackedXYBarRendererSample.png" /> */ public class StackedXYBarRenderer extends XYBarRenderer { /** For serialization. */ private static final long serialVersionUID = -7049101055533436444L; /** A flag that controls whether the bars display values or percentages. */ private boolean renderAsPercentages; /** * Creates a new renderer. */ public StackedXYBarRenderer() { this(0.0); } /** * Creates a new renderer. * * @param margin the percentual amount of the bars that are cut away. */ public StackedXYBarRenderer(double margin) { super(margin); this.renderAsPercentages = false; // set the default item label positions, which will only be used if // the user requests visible item labels... ItemLabelPosition p = new ItemLabelPosition(ItemLabelAnchor.CENTER, TextAnchor.CENTER); setBasePositiveItemLabelPosition(p); setBaseNegativeItemLabelPosition(p); setPositiveItemLabelPositionFallback(null); setNegativeItemLabelPositionFallback(null); } /** * Returns <code>true if the renderer displays each item value as * a percentage (so that the stacked bars add to 100%), and * <code>false otherwise. * * @return A boolean. * * @see #setRenderAsPercentages(boolean) * * @since 1.0.5 */ public boolean getRenderAsPercentages() { return this.renderAsPercentages; } /** * Sets the flag that controls whether the renderer displays each item * value as a percentage (so that the stacked bars add to 100%), and sends * a {@link RendererChangeEvent} to all registered listeners. * * @param asPercentages the flag. * * @see #getRenderAsPercentages() * * @since 1.0.5 */ public void setRenderAsPercentages(boolean asPercentages) { this.renderAsPercentages = asPercentages; fireChangeEvent(); } /** * Returns <code>3 to indicate that this renderer requires three * passes for drawing (shadows are drawn in the first pass, the bars in the * second, and item labels are drawn in the third pass so that * they always appear in front of all the bars). * * @return <code>2. */ public int getPassCount() { return 3; } /** * Initialises the renderer and returns a state object that should be * passed to all subsequent calls to the drawItem() method. Here there is * nothing to do. * * @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 new XYBarRendererState(info); } /** * Returns the range of values the renderer requires to display all the * items from the specified dataset. * * @param dataset the dataset (<code>null permitted). * * @return The range (<code>null if the dataset is null * or empty). */ public Range findRangeBounds(XYDataset dataset) { if (dataset != null) { if (this.renderAsPercentages) { return new Range(0.0, 1.0); } else { return DatasetUtilities.findStackedRangeBounds( (TableXYDataset) dataset); } } else { return null; } } /** * 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 plot 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 axis. * @param rangeAxis the range 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 (!(dataset instanceof IntervalXYDataset && dataset instanceof TableXYDataset)) { String message = "dataset (type " + dataset.getClass().getName() + ") has wrong type:"; boolean and = false; if (!IntervalXYDataset.class.isAssignableFrom(dataset.getClass())) { message += " it is no IntervalXYDataset"; and = true; } if (!TableXYDataset.class.isAssignableFrom(dataset.getClass())) { if (and) { message += " and"; } message += " it is no TableXYDataset"; } throw new IllegalArgumentException(message); } IntervalXYDataset intervalDataset = (IntervalXYDataset) dataset; double value = intervalDataset.getYValue(series, item); if (Double.isNaN(value)) { return; } // if we are rendering the values as percentages, we need to calculate // the total for the current item. Unfortunately here we end up // repeating the calculation more times than is strictly necessary - // hopefully I'll come back to this and find a way to add the // total(s) to the renderer state. The other problem is we implicitly // assume the dataset has no negative values...perhaps that can be // fixed too. double total = 0.0; if (this.renderAsPercentages) { total = DatasetUtilities.calculateStackTotal( (TableXYDataset) dataset, item); value = value / total; } double positiveBase = 0.0; double negativeBase = 0.0; for (int i = 0; i < series; i++) { double v = dataset.getYValue(i, item); if (!Double.isNaN(v)) { if (this.renderAsPercentages) { v = v / total; } if (v > 0) { positiveBase = positiveBase + v; } else { negativeBase = negativeBase + v; } } } double translatedBase; double translatedValue; RectangleEdge edgeR = plot.getRangeAxisEdge(); if (value > 0.0) { translatedBase = rangeAxis.valueToJava2D(positiveBase, dataArea, edgeR); translatedValue = rangeAxis.valueToJava2D(positiveBase + value, dataArea, edgeR); } else { translatedBase = rangeAxis.valueToJava2D(negativeBase, dataArea, edgeR); translatedValue = rangeAxis.valueToJava2D(negativeBase + value, dataArea, edgeR); } RectangleEdge edgeD = plot.getDomainAxisEdge(); double startX = intervalDataset.getStartXValue(series, item); if (Double.isNaN(startX)) { return; } double translatedStartX = domainAxis.valueToJava2D(startX, dataArea, edgeD); double endX = intervalDataset.getEndXValue(series, item); if (Double.isNaN(endX)) { return; } double translatedEndX = domainAxis.valueToJava2D(endX, dataArea, edgeD); double translatedWidth = Math.max(1, Math.abs(translatedEndX - translatedStartX)); double translatedHeight = Math.abs(translatedValue - translatedBase); if (getMargin() > 0.0) { double cut = translatedWidth * getMargin(); translatedWidth = translatedWidth - cut; translatedStartX = translatedStartX + cut / 2; } Rectangle2D bar = null; PlotOrientation orientation = plot.getOrientation(); if (orientation == PlotOrientation.HORIZONTAL) { bar = new Rectangle2D.Double(Math.min(translatedBase, translatedValue), translatedEndX, translatedHeight, translatedWidth); } else if (orientation == PlotOrientation.VERTICAL) { bar = new Rectangle2D.Double(translatedStartX, Math.min(translatedBase, translatedValue), translatedWidth, translatedHeight); } boolean positive = (value > 0.0); boolean inverted = rangeAxis.isInverted(); RectangleEdge barBase; if (orientation == PlotOrientation.HORIZONTAL) { if (positive && inverted || !positive && !inverted) { barBase = RectangleEdge.RIGHT; } else { barBase = RectangleEdge.LEFT; } } else { if (positive && !inverted || !positive && inverted) { barBase = RectangleEdge.BOTTOM; } else { barBase = RectangleEdge.TOP; } } if (pass == 0) { if (getShadowsVisible()) { getBarPainter().paintBarShadow(g2, this, series, item, bar, barBase, false); } } else if (pass == 1) { getBarPainter().paintBar(g2, this, series, item, bar, barBase); // add an entity for the item... if (info != null) { EntityCollection entities = info.getOwner() .getEntityCollection(); if (entities != null) { addEntity(entities, bar, dataset, series, item, bar.getCenterX(), bar.getCenterY()); } } } else if (pass == 2) { // handle item label drawing, now that we know all the bars have // been drawn... if (isItemLabelVisible(series, item)) { XYItemLabelGenerator generator = getItemLabelGenerator(series, item); drawItemLabel(g2, dataset, series, item, plot, generator, bar, value < 0.0); } } } /** * 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 StackedXYBarRenderer)) { return false; } StackedXYBarRenderer that = (StackedXYBarRenderer) obj; if (this.renderAsPercentages != that.renderAsPercentages) { return false; } return super.equals(obj); } /** * Returns a hash code for this instance. * * @return A hash code. */ public int hashCode() { int result = super.hashCode(); result = result * 37 + (this.renderAsPercentages ? 1 : 0); return result; } }

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