home | career | drupal | java | mac | mysql | perl | scala | uml | unix  

jfreechart example source code file (BarRenderer.java)

This example jfreechart source code file (BarRenderer.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, barpainter, barrenderer, categorydataset, categoryitemrendererstate, categoryplot, geometry, io, itemlabelposition, itemlabelposition, paint, paint, plotorientation, rectangle2d, rectangle2d, string, string

The jfreechart BarRenderer.java source code

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2009, 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.]
 *
 * ----------------
 * BarRenderer.java
 * ----------------
 * (C) Copyright 2002-2009, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   Christian W. Zuckschwerdt;
 *                   Peter Kolb (patch 2497611);
 *
 * Changes
 * -------
 * 14-Mar-2002 : Version 1 (DG);
 * 23-May-2002 : Added tooltip generator to renderer (DG);
 * 29-May-2002 : Moved tooltip generator to abstract super-class (DG);
 * 25-Jun-2002 : Changed constructor to protected and removed redundant
 *               code (DG);
 * 26-Jun-2002 : Added axis to initialise method, and record upper and lower
 *               clip values (DG);
 * 24-Sep-2002 : Added getLegendItem() method (DG);
 * 09-Oct-2002 : Modified constructor to include URL generator (DG);
 * 05-Nov-2002 : Base dataset is now TableDataset not CategoryDataset (DG);
 * 10-Jan-2003 : Moved get/setItemMargin() method up from subclasses (DG);
 * 17-Jan-2003 : Moved plot classes into a separate package (DG);
 * 25-Mar-2003 : Implemented Serializable (DG);
 * 01-May-2003 : Modified clipping to allow for dual axes and datasets (DG);
 * 12-May-2003 : Merged horizontal and vertical bar renderers (DG);
 * 12-Jun-2003 : Updates for item labels (DG);
 * 30-Jul-2003 : Modified entity constructor (CZ);
 * 02-Sep-2003 : Changed initialise method to fix bug 790407 (DG);
 * 16-Sep-2003 : Changed ChartRenderingInfo --> PlotRenderingInfo (DG);
 * 07-Oct-2003 : Added renderer state (DG);
 * 27-Oct-2003 : Merged drawHorizontalItem() and drawVerticalItem()
 *               methods (DG);
 * 28-Oct-2003 : Added support for gradient paint on bars (DG);
 * 14-Nov-2003 : Added 'maxBarWidth' attribute (DG);
 * 10-Feb-2004 : Small changes inside drawItem() method to ease cut-and-paste
 *               overriding (DG);
 * 19-Mar-2004 : Fixed bug introduced with separation of tool tip and item
 *               label generators.  Fixed equals() method (DG);
 * 11-May-2004 : Fix for null pointer exception (bug id 951127) (DG);
 * 05-Nov-2004 : Modified drawItem() signature (DG);
 * 26-Jan-2005 : Provided override for getLegendItem() method (DG);
 * 20-Apr-2005 : Generate legend labels, tooltips and URLs (DG);
 * 18-May-2005 : Added configurable base value (DG);
 * 09-Jun-2005 : Use addItemEntity() method from superclass (DG);
 * 01-Dec-2005 : Update legend item to use/not use outline (DG);
 * ------------: JFreeChart 1.0.x ---------------------------------------------
 * 06-Dec-2005 : Fixed bug 1374222 (JDK 1.4 specific code) (DG);
 * 11-Jan-2006 : Fixed bug 1401856 (bad rendering for non-zero base) (DG);
 * 04-Aug-2006 : Fixed bug 1467706 (missing item labels for zero value
 *               bars) (DG);
 * 04-Dec-2006 : Fixed bug in rendering to non-primary axis (DG);
 * 13-Dec-2006 : Add support for GradientPaint display in legend items (DG);
 * 20-Apr-2007 : Updated getLegendItem() for renderer change (DG);
 * 11-May-2007 : Check for visibility in getLegendItem() (DG);
 * 17-May-2007 : Set datasetIndex and seriesIndex in getLegendItem() (DG);
 * 18-May-2007 : Set dataset and seriesKey for LegendItem (DG);
 * 07-May-2008 : If minimumBarLength is > 0.0, extend the non-base end of the
 *               bar (DG);
 * 17-Jun-2008 : Apply legend shape, font and paint attributes (DG);
 * 24-Jun-2008 : Added barPainter mechanism (DG);
 * 26-Jun-2008 : Added crosshair support (DG);
 * 13-Aug-2008 : Added shadowPaint attribute (DG);
 * 14-Jan-2009 : Added support for seriesVisible flags (PK);
 * 03-Feb-2009 : Added defaultShadowsVisible flag - see patch 2511330 (PK);
 *
 */

package org.jfree.chart.renderer.category;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.geom.Line2D;
import java.awt.geom.Point2D;
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.CategoryAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.entity.EntityCollection;
import org.jfree.chart.event.RendererChangeEvent;
import org.jfree.chart.labels.CategoryItemLabelGenerator;
import org.jfree.chart.labels.ItemLabelAnchor;
import org.jfree.chart.labels.ItemLabelPosition;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.PlotRenderingInfo;
import org.jfree.data.Range;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.general.DatasetUtilities;
import org.jfree.io.SerialUtilities;
import org.jfree.text.TextUtilities;
import org.jfree.ui.GradientPaintTransformer;
import org.jfree.ui.RectangleEdge;
import org.jfree.ui.StandardGradientPaintTransformer;
import org.jfree.util.ObjectUtilities;
import org.jfree.util.PaintUtilities;
import org.jfree.util.PublicCloneable;

/**
 * A {@link CategoryItemRenderer} that draws individual data items as bars.
 * The example shown here is generated by the <code>BarChartDemo1.java
 * program included in the JFreeChart Demo Collection:
 * <br>
* <img src="../../../../../images/BarRendererSample.png" * alt="BarRendererSample.png" /> */ public class BarRenderer extends AbstractCategoryItemRenderer implements Cloneable, PublicCloneable, Serializable { /** For serialization. */ private static final long serialVersionUID = 6000649414965887481L; /** The default item margin percentage. */ public static final double DEFAULT_ITEM_MARGIN = 0.20; /** * Constant that controls the minimum width before a bar has an outline * drawn. */ public static final double BAR_OUTLINE_WIDTH_THRESHOLD = 3.0; /** * The default bar painter assigned to each new instance of this renderer. * * @since 1.0.11 */ private static BarPainter defaultBarPainter = new GradientBarPainter(); /** * Returns the default bar painter. * * @return The default bar painter. * * @since 1.0.11 */ public static BarPainter getDefaultBarPainter() { return BarRenderer.defaultBarPainter; } /** * Sets the default bar painter. * * @param painter the painter (<code>null not permitted). * * @since 1.0.11 */ public static void setDefaultBarPainter(BarPainter painter) { if (painter == null) { throw new IllegalArgumentException("Null 'painter' argument."); } BarRenderer.defaultBarPainter = painter; } /** * The default value for the initialisation of the shadowsVisible flag. */ private static boolean defaultShadowsVisible = true; /** * Returns the default value for the <code>shadowsVisible flag. * * @return A boolean. * * @see #setDefaultShadowsVisible(boolean) * * @since 1.0.13 */ public static boolean getDefaultShadowsVisible() { return BarRenderer.defaultShadowsVisible; } /** * Sets the default value for the shadows visible flag. * * @param visible the new value for the default. * * @see #getDefaultShadowsVisible() * * @since 1.0.13 */ public static void setDefaultShadowsVisible(boolean visible) { BarRenderer.defaultShadowsVisible = visible; } /** The margin between items (bars) within a category. */ private double itemMargin; /** A flag that controls whether or not bar outlines are drawn. */ private boolean drawBarOutline; /** The maximum bar width as a percentage of the available space. */ private double maximumBarWidth; /** The minimum bar length (in Java2D units). */ private double minimumBarLength; /** * An optional class used to transform gradient paint objects to fit each * bar. */ private GradientPaintTransformer gradientPaintTransformer; /** * The fallback position if a positive item label doesn't fit inside the * bar. */ private ItemLabelPosition positiveItemLabelPositionFallback; /** * The fallback position if a negative item label doesn't fit inside the * bar. */ private ItemLabelPosition negativeItemLabelPositionFallback; /** The upper clip (axis) value for the axis. */ private double upperClip; // TODO: this needs to move into the renderer state /** The lower clip (axis) value for the axis. */ private double lowerClip; // TODO: this needs to move into the renderer state /** The base value for the bars (defaults to 0.0). */ private double base; /** * A flag that controls whether the base value is included in the range * returned by the findRangeBounds() method. */ private boolean includeBaseInRange; /** * The bar painter (never <code>null). * * @since 1.0.11 */ private BarPainter barPainter; /** * The flag that controls whether or not shadows are drawn for the bars. * * @since 1.0.11 */ private boolean shadowsVisible; /** * The shadow paint. * * @since 1.0.11 */ private transient Paint shadowPaint; /** * The x-offset for the shadow effect. * * @since 1.0.11 */ private double shadowXOffset; /** * The y-offset for the shadow effect. * * @since 1.0.11 */ private double shadowYOffset; /** * Creates a new bar renderer with default settings. */ public BarRenderer() { super(); this.base = 0.0; this.includeBaseInRange = true; this.itemMargin = DEFAULT_ITEM_MARGIN; this.drawBarOutline = false; this.maximumBarWidth = 1.0; // 100 percent, so it will not apply unless changed this.positiveItemLabelPositionFallback = null; this.negativeItemLabelPositionFallback = null; this.gradientPaintTransformer = new StandardGradientPaintTransformer(); this.minimumBarLength = 0.0; setBaseLegendShape(new Rectangle2D.Double(-4.0, -4.0, 8.0, 8.0)); this.barPainter = getDefaultBarPainter(); this.shadowsVisible = getDefaultShadowsVisible(); this.shadowPaint = Color.gray; this.shadowXOffset = 4.0; this.shadowYOffset = 4.0; } /** * Returns the base value for the bars. The default value is * <code>0.0. * * @return The base value for the bars. * * @see #setBase(double) */ public double getBase() { return this.base; } /** * Sets the base value for the bars and sends a {@link RendererChangeEvent} * to all registered listeners. * * @param base the new base value. * * @see #getBase() */ public void setBase(double base) { this.base = base; fireChangeEvent(); } /** * Returns the item margin as a percentage of the available space for all * bars. * * @return The margin percentage (where 0.10 is ten percent). * * @see #setItemMargin(double) */ public double getItemMargin() { return this.itemMargin; } /** * Sets the item margin and sends a {@link RendererChangeEvent} to all * registered listeners. The value is expressed as a percentage of the * available width for plotting all the bars, with the resulting amount to * be distributed between all the bars evenly. * * @param percent the margin (where 0.10 is ten percent). * * @see #getItemMargin() */ public void setItemMargin(double percent) { this.itemMargin = percent; fireChangeEvent(); } /** * Returns a flag that controls whether or not bar outlines are drawn. * * @return A boolean. * * @see #setDrawBarOutline(boolean) */ public boolean isDrawBarOutline() { return this.drawBarOutline; } /** * Sets the flag that controls whether or not bar outlines are drawn and * sends a {@link RendererChangeEvent} to all registered listeners. * * @param draw the flag. * * @see #isDrawBarOutline() */ public void setDrawBarOutline(boolean draw) { this.drawBarOutline = draw; fireChangeEvent(); } /** * Returns the maximum bar width, as a percentage of the available drawing * space. * * @return The maximum bar width. * * @see #setMaximumBarWidth(double) */ public double getMaximumBarWidth() { return this.maximumBarWidth; } /** * Sets the maximum bar width, which is specified as a percentage of the * available space for all bars, and sends a {@link RendererChangeEvent} to * all registered listeners. * * @param percent the percent (where 0.05 is five percent). * * @see #getMaximumBarWidth() */ public void setMaximumBarWidth(double percent) { this.maximumBarWidth = percent; fireChangeEvent(); } /** * Returns the minimum bar length (in Java2D units). The default value is * 0.0. * * @return The minimum bar length. * * @see #setMinimumBarLength(double) */ public double getMinimumBarLength() { return this.minimumBarLength; } /** * Sets the minimum bar length and sends a {@link RendererChangeEvent} to * all registered listeners. The minimum bar length is specified in Java2D * units, and can be used to prevent bars that represent very small data * values from disappearing when drawn on the screen. Typically you would * set this to (say) 0.5 or 1.0 Java 2D units. Use this attribute with * caution, however, because setting it to a non-zero value will * artificially increase the length of bars representing small values, * which may misrepresent your data. * * @param min the minimum bar length (in Java2D units, must be >= 0.0). * * @see #getMinimumBarLength() */ public void setMinimumBarLength(double min) { if (min < 0.0) { throw new IllegalArgumentException("Requires 'min' >= 0.0"); } this.minimumBarLength = min; fireChangeEvent(); } /** * Returns the gradient paint transformer (an object used to transform * gradient paint objects to fit each bar). * * @return A transformer (<code>null 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 permitted). * * @see #getGradientPaintTransformer() */ public void setGradientPaintTransformer( GradientPaintTransformer transformer) { this.gradientPaintTransformer = transformer; fireChangeEvent(); } /** * Returns the fallback position for positive item labels that don't fit * within a bar. * * @return The fallback position (<code>null possible). * * @see #setPositiveItemLabelPositionFallback(ItemLabelPosition) */ public ItemLabelPosition getPositiveItemLabelPositionFallback() { return this.positiveItemLabelPositionFallback; } /** * Sets the fallback position for positive item labels that don't fit * within a bar, and sends a {@link RendererChangeEvent} to all registered * listeners. * * @param position the position (<code>null permitted). * * @see #getPositiveItemLabelPositionFallback() */ public void setPositiveItemLabelPositionFallback( ItemLabelPosition position) { this.positiveItemLabelPositionFallback = position; fireChangeEvent(); } /** * Returns the fallback position for negative item labels that don't fit * within a bar. * * @return The fallback position (<code>null possible). * * @see #setPositiveItemLabelPositionFallback(ItemLabelPosition) */ public ItemLabelPosition getNegativeItemLabelPositionFallback() { return this.negativeItemLabelPositionFallback; } /** * Sets the fallback position for negative item labels that don't fit * within a bar, and sends a {@link RendererChangeEvent} to all registered * listeners. * * @param position the position (<code>null permitted). * * @see #getNegativeItemLabelPositionFallback() */ public void setNegativeItemLabelPositionFallback( ItemLabelPosition position) { this.negativeItemLabelPositionFallback = position; fireChangeEvent(); } /** * Returns the flag that controls whether or not the base value for the * bars is included in the range calculated by * {@link #findRangeBounds(CategoryDataset)}. * * @return <code>true if the base is included in the range, and * <code>false otherwise. * * @since 1.0.1 * * @see #setIncludeBaseInRange(boolean) */ public boolean getIncludeBaseInRange() { return this.includeBaseInRange; } /** * Sets the flag that controls whether or not the base value for the bars * is included in the range calculated by * {@link #findRangeBounds(CategoryDataset)}. If the flag is changed, * a {@link RendererChangeEvent} is sent to all registered listeners. * * @param include the new value for the flag. * * @since 1.0.1 * * @see #getIncludeBaseInRange() */ public void setIncludeBaseInRange(boolean include) { if (this.includeBaseInRange != include) { this.includeBaseInRange = include; fireChangeEvent(); } } /** * Returns the bar painter. * * @return The bar painter (never <code>null). * * @see #setBarPainter(BarPainter) * * @since 1.0.11 */ public BarPainter getBarPainter() { return this.barPainter; } /** * Sets the bar painter for this renderer and sends a * {@link RendererChangeEvent} to all registered listeners. * * @param painter the painter (<code>null not permitted). * * @see #getBarPainter() * * @since 1.0.11 */ public void setBarPainter(BarPainter painter) { if (painter == null) { throw new IllegalArgumentException("Null 'painter' argument."); } this.barPainter = painter; fireChangeEvent(); } /** * Returns the flag that controls whether or not shadows are drawn for * the bars. * * @return A boolean. * * @since 1.0.11 */ public boolean getShadowsVisible() { return this.shadowsVisible; } /** * Sets the flag that controls whether or not shadows are * drawn by the renderer. * * @param visible the new flag value. * * @since 1.0.11 */ public void setShadowVisible(boolean visible) { this.shadowsVisible = visible; fireChangeEvent(); } /** * Returns the shadow paint. * * @return The shadow paint. * * @see #setShadowPaint(Paint) * * @since 1.0.11 */ public Paint getShadowPaint() { return this.shadowPaint; } /** * Sets the shadow paint and sends a {@link RendererChangeEvent} to all * registered listeners. * * @param paint the paint (<code>null not permitted). * * @see #getShadowPaint() * * @since 1.0.11 */ public void setShadowPaint(Paint paint) { if (paint == null) { throw new IllegalArgumentException("Null 'paint' argument."); } this.shadowPaint = paint; fireChangeEvent(); } /** * Returns the shadow x-offset. * * @return The shadow x-offset. * * @since 1.0.11 */ public double getShadowXOffset() { return this.shadowXOffset; } /** * Sets the x-offset for the bar shadow and sends a * {@link RendererChangeEvent} to all registered listeners. * * @param offset the offset. * * @since 1.0.11 */ public void setShadowXOffset(double offset) { this.shadowXOffset = offset; fireChangeEvent(); } /** * Returns the shadow y-offset. * * @return The shadow y-offset. * * @since 1.0.11 */ public double getShadowYOffset() { return this.shadowYOffset; } /** * Sets the y-offset for the bar shadow and sends a * {@link RendererChangeEvent} to all registered listeners. * * @param offset the offset. * * @since 1.0.11 */ public void setShadowYOffset(double offset) { this.shadowYOffset = offset; fireChangeEvent(); } /** * Returns the lower clip value. This value is recalculated in the * initialise() method. * * @return The value. */ public double getLowerClip() { // TODO: this attribute should be transferred to the renderer state. return this.lowerClip; } /** * Returns the upper clip value. This value is recalculated in the * initialise() method. * * @return The value. */ public double getUpperClip() { // TODO: this attribute should be transferred to the renderer state. return this.upperClip; } /** * Initialises the renderer and returns a state object that will be passed * to subsequent calls to the drawItem method. This method gets called * once at the start of the process of drawing a chart. * * @param g2 the graphics device. * @param dataArea the area in which the data is to be plotted. * @param plot the plot. * @param rendererIndex the renderer index. * @param info collects chart rendering information for return to caller. * * @return The renderer state. */ public CategoryItemRendererState initialise(Graphics2D g2, Rectangle2D dataArea, CategoryPlot plot, int rendererIndex, PlotRenderingInfo info) { CategoryItemRendererState state = super.initialise(g2, dataArea, plot, rendererIndex, info); // get the clipping values... ValueAxis rangeAxis = plot.getRangeAxisForDataset(rendererIndex); this.lowerClip = rangeAxis.getRange().getLowerBound(); this.upperClip = rangeAxis.getRange().getUpperBound(); // calculate the bar width calculateBarWidth(plot, dataArea, rendererIndex, state); return state; } /** * Calculates the bar width and stores it in the renderer state. * * @param plot the plot. * @param dataArea the data area. * @param rendererIndex the renderer index. * @param state the renderer state. */ protected void calculateBarWidth(CategoryPlot plot, Rectangle2D dataArea, int rendererIndex, CategoryItemRendererState state) { CategoryAxis domainAxis = getDomainAxis(plot, rendererIndex); CategoryDataset dataset = plot.getDataset(rendererIndex); if (dataset != null) { int columns = dataset.getColumnCount(); int rows = state.getVisibleSeriesCount() >= 0 ? state.getVisibleSeriesCount() : dataset.getRowCount(); double space = 0.0; PlotOrientation orientation = plot.getOrientation(); if (orientation == PlotOrientation.HORIZONTAL) { space = dataArea.getHeight(); } else if (orientation == PlotOrientation.VERTICAL) { space = dataArea.getWidth(); } double maxWidth = space * getMaximumBarWidth(); double categoryMargin = 0.0; double currentItemMargin = 0.0; if (columns > 1) { categoryMargin = domainAxis.getCategoryMargin(); } if (rows > 1) { currentItemMargin = getItemMargin(); } double used = space * (1 - domainAxis.getLowerMargin() - domainAxis.getUpperMargin() - categoryMargin - currentItemMargin); if ((rows * columns) > 0) { state.setBarWidth(Math.min(used / (rows * columns), maxWidth)); } else { state.setBarWidth(Math.min(used, maxWidth)); } } } /** * Calculates the coordinate of the first "side" of a bar. This will be * the minimum x-coordinate for a vertical bar, and the minimum * y-coordinate for a horizontal bar. * * @param plot the plot. * @param orientation the plot orientation. * @param dataArea the data area. * @param domainAxis the domain axis. * @param state the renderer state (has the bar width precalculated). * @param row the row index. * @param column the column index. * * @return The coordinate. */ protected double calculateBarW0(CategoryPlot plot, PlotOrientation orientation, Rectangle2D dataArea, CategoryAxis domainAxis, CategoryItemRendererState state, int row, int column) { // calculate bar width... double space = 0.0; if (orientation == PlotOrientation.HORIZONTAL) { space = dataArea.getHeight(); } else { space = dataArea.getWidth(); } double barW0 = domainAxis.getCategoryStart(column, getColumnCount(), dataArea, plot.getDomainAxisEdge()); int seriesCount = state.getVisibleSeriesCount() >= 0 ? state.getVisibleSeriesCount() : getRowCount(); int categoryCount = getColumnCount(); if (seriesCount > 1) { double seriesGap = space * getItemMargin() / (categoryCount * (seriesCount - 1)); double seriesW = calculateSeriesWidth(space, domainAxis, categoryCount, seriesCount); barW0 = barW0 + row * (seriesW + seriesGap) + (seriesW / 2.0) - (state.getBarWidth() / 2.0); } else { barW0 = domainAxis.getCategoryMiddle(column, getColumnCount(), dataArea, plot.getDomainAxisEdge()) - state.getBarWidth() / 2.0; } return barW0; } /** * Calculates the coordinates for the length of a single bar. * * @param value the value represented by the bar. * * @return The coordinates for each end of the bar (or <code>null if * the bar is not visible for the current axis range). */ protected double[] calculateBarL0L1(double value) { double lclip = getLowerClip(); double uclip = getUpperClip(); double barLow = Math.min(this.base, value); double barHigh = Math.max(this.base, value); if (barHigh < lclip) { // bar is not visible return null; } if (barLow > uclip) { // bar is not visible return null; } barLow = Math.max(barLow, lclip); barHigh = Math.min(barHigh, uclip); return new double[] {barLow, barHigh}; } /** * Returns the range of values the renderer requires to display all the * items from the specified dataset. This takes into account the range * of values in the dataset, plus the flag that determines whether or not * the base value for the bars should be included in the range. * * @param dataset the dataset (<code>null permitted). * * @return The range (or <code>null if the dataset is * <code>null or empty). */ public Range findRangeBounds(CategoryDataset dataset) { if (dataset == null) { return null; } Range result = DatasetUtilities.findRangeBounds(dataset); if (result != null) { if (this.includeBaseInRange) { result = Range.expandToInclude(result, this.base); } } return result; } /** * Returns a legend item for a series. * * @param datasetIndex the dataset index (zero-based). * @param series the series index (zero-based). * * @return The legend item (possibly <code>null). */ public LegendItem getLegendItem(int datasetIndex, int series) { CategoryPlot cp = getPlot(); if (cp == null) { return null; } // check that a legend item needs to be displayed... if (!isSeriesVisible(series) || !isSeriesVisibleInLegend(series)) { return null; } CategoryDataset dataset = cp.getDataset(datasetIndex); 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); } Shape shape = lookupLegendShape(series); Paint paint = lookupSeriesPaint(series); Paint outlinePaint = lookupSeriesOutlinePaint(series); Stroke outlineStroke = lookupSeriesOutlineStroke(series); LegendItem result = new LegendItem(label, description, toolTipText, urlText, true, shape, true, paint, isDrawBarOutline(), outlinePaint, outlineStroke, false, new Line2D.Float(), new BasicStroke(1.0f), Color.black); result.setLabelFont(lookupLegendTextFont(series)); Paint labelPaint = lookupLegendTextPaint(series); if (labelPaint != null) { result.setLabelPaint(labelPaint); } result.setDataset(dataset); result.setDatasetIndex(datasetIndex); result.setSeriesKey(dataset.getRowKey(series)); result.setSeriesIndex(series); if (this.gradientPaintTransformer != null) { result.setFillPaintTransformer(this.gradientPaintTransformer); } return result; } /** * Draws the bar for a single (series, category) data item. * * @param g2 the graphics device. * @param state the renderer state. * @param dataArea the data area. * @param plot the plot. * @param domainAxis the domain axis. * @param rangeAxis the range axis. * @param dataset the dataset. * @param row the row index (zero-based). * @param column the column index (zero-based). * @param pass the pass index. */ public void drawItem(Graphics2D g2, CategoryItemRendererState state, Rectangle2D dataArea, CategoryPlot plot, CategoryAxis domainAxis, ValueAxis rangeAxis, CategoryDataset dataset, int row, int column, int pass) { // nothing is drawn if the row index is not included in the list with // the indices of the visible rows... int visibleRow = state.getVisibleSeriesIndex(row); if (visibleRow < 0) { return; } // nothing is drawn for null values... Number dataValue = dataset.getValue(row, column); if (dataValue == null) { return; } final double value = dataValue.doubleValue(); PlotOrientation orientation = plot.getOrientation(); double barW0 = calculateBarW0(plot, orientation, dataArea, domainAxis, state, visibleRow, column); double[] barL0L1 = calculateBarL0L1(value); if (barL0L1 == null) { return; // the bar is not visible } RectangleEdge edge = plot.getRangeAxisEdge(); double transL0 = rangeAxis.valueToJava2D(barL0L1[0], dataArea, edge); double transL1 = rangeAxis.valueToJava2D(barL0L1[1], dataArea, edge); // in the following code, barL0 is (in Java2D coordinates) the LEFT // end of the bar for a horizontal bar chart, and the TOP end of the // bar for a vertical bar chart. Whether this is the BASE of the bar // or not depends also on (a) whether the data value is 'negative' // relative to the base value and (b) whether or not the range axis is // inverted. This only matters if/when we apply the minimumBarLength // attribute, because we should extend the non-base end of the bar boolean positive = (value >= this.base); boolean inverted = rangeAxis.isInverted(); double barL0 = Math.min(transL0, transL1); double barLength = Math.abs(transL1 - transL0); double barLengthAdj = 0.0; if (barLength > 0.0 && barLength < getMinimumBarLength()) { barLengthAdj = getMinimumBarLength() - barLength; } double barL0Adj = 0.0; RectangleEdge barBase; if (orientation == PlotOrientation.HORIZONTAL) { if (positive && inverted || !positive && !inverted) { barL0Adj = barLengthAdj; barBase = RectangleEdge.RIGHT; } else { barBase = RectangleEdge.LEFT; } } else { if (positive && !inverted || !positive && inverted) { barL0Adj = barLengthAdj; barBase = RectangleEdge.BOTTOM; } else { barBase = RectangleEdge.TOP; } } // draw the bar... Rectangle2D bar = null; if (orientation == PlotOrientation.HORIZONTAL) { bar = new Rectangle2D.Double(barL0 - barL0Adj, barW0, barLength + barLengthAdj, state.getBarWidth()); } else { bar = new Rectangle2D.Double(barW0, barL0 - barL0Adj, state.getBarWidth(), barLength + barLengthAdj); } if (getShadowsVisible()) { this.barPainter.paintBarShadow(g2, this, row, column, bar, barBase, true); } this.barPainter.paintBar(g2, this, row, column, bar, barBase); CategoryItemLabelGenerator generator = getItemLabelGenerator(row, column); if (generator != null && isItemLabelVisible(row, column)) { drawItemLabel(g2, dataset, row, column, plot, generator, bar, (value < 0.0)); } // submit the current data point as a crosshair candidate int datasetIndex = plot.indexOf(dataset); updateCrosshairValues(state.getCrosshairState(), dataset.getRowKey(row), dataset.getColumnKey(column), value, datasetIndex, barW0, barL0, orientation); // add an item entity, if this information is being collected EntityCollection entities = state.getEntityCollection(); if (entities != null) { addItemEntity(entities, dataset, row, column, bar); } } /** * Calculates the available space for each series. * * @param space the space along the entire axis (in Java2D units). * @param axis the category axis. * @param categories the number of categories. * @param series the number of series. * * @return The width of one series. */ protected double calculateSeriesWidth(double space, CategoryAxis axis, int categories, int series) { double factor = 1.0 - getItemMargin() - axis.getLowerMargin() - axis.getUpperMargin(); if (categories > 1) { factor = factor - axis.getCategoryMargin(); } return (space * factor) / (categories * series); } /** * Draws an item label. This method is overridden so that the bar can be * used to calculate the label anchor point. * * @param g2 the graphics device. * @param data the dataset. * @param row the row. * @param column the column. * @param plot the plot. * @param generator the label generator. * @param bar the bar. * @param negative a flag indicating a negative value. */ protected void drawItemLabel(Graphics2D g2, CategoryDataset data, int row, int column, CategoryPlot plot, CategoryItemLabelGenerator generator, Rectangle2D bar, boolean negative) { String label = generator.generateLabel(data, row, column); if (label == null) { return; // nothing to do } Font labelFont = getItemLabelFont(row, column); g2.setFont(labelFont); Paint paint = getItemLabelPaint(row, column); g2.setPaint(paint); // find out where to place the label... ItemLabelPosition position = null; if (!negative) { position = getPositiveItemLabelPosition(row, column); } else { position = getNegativeItemLabelPosition(row, column); } // work out the label anchor point... Point2D anchorPoint = calculateLabelAnchorPoint( position.getItemLabelAnchor(), bar, plot.getOrientation()); if (isInternalAnchor(position.getItemLabelAnchor())) { Shape bounds = TextUtilities.calculateRotatedStringBounds(label, g2, (float) anchorPoint.getX(), (float) anchorPoint.getY(), position.getTextAnchor(), position.getAngle(), position.getRotationAnchor()); if (bounds != null) { if (!bar.contains(bounds.getBounds2D())) { if (!negative) { position = getPositiveItemLabelPositionFallback(); } else { position = getNegativeItemLabelPositionFallback(); } if (position != null) { anchorPoint = calculateLabelAnchorPoint( position.getItemLabelAnchor(), bar, plot.getOrientation()); } } } } if (position != null) { TextUtilities.drawRotatedString(label, g2, (float) anchorPoint.getX(), (float) anchorPoint.getY(), position.getTextAnchor(), position.getAngle(), position.getRotationAnchor()); } } /** * Calculates the item label anchor point. * * @param anchor the anchor. * @param bar the bar. * @param orientation the plot orientation. * * @return The anchor point. */ private Point2D calculateLabelAnchorPoint(ItemLabelAnchor anchor, Rectangle2D bar, PlotOrientation orientation) { Point2D result = null; double offset = getItemLabelAnchorOffset(); double x0 = bar.getX() - offset; double x1 = bar.getX(); double x2 = bar.getX() + offset; double x3 = bar.getCenterX(); double x4 = bar.getMaxX() - offset; double x5 = bar.getMaxX(); double x6 = bar.getMaxX() + offset; double y0 = bar.getMaxY() + offset; double y1 = bar.getMaxY(); double y2 = bar.getMaxY() - offset; double y3 = bar.getCenterY(); double y4 = bar.getMinY() + offset; double y5 = bar.getMinY(); double y6 = bar.getMinY() - offset; if (anchor == ItemLabelAnchor.CENTER) { result = new Point2D.Double(x3, y3); } else if (anchor == ItemLabelAnchor.INSIDE1) { result = new Point2D.Double(x4, y4); } else if (anchor == ItemLabelAnchor.INSIDE2) { result = new Point2D.Double(x4, y4); } else if (anchor == ItemLabelAnchor.INSIDE3) { result = new Point2D.Double(x4, y3); } else if (anchor == ItemLabelAnchor.INSIDE4) { result = new Point2D.Double(x4, y2); } else if (anchor == ItemLabelAnchor.INSIDE5) { result = new Point2D.Double(x4, y2); } else if (anchor == ItemLabelAnchor.INSIDE6) { result = new Point2D.Double(x3, y2); } else if (anchor == ItemLabelAnchor.INSIDE7) { result = new Point2D.Double(x2, y2); } else if (anchor == ItemLabelAnchor.INSIDE8) { result = new Point2D.Double(x2, y2); } else if (anchor == ItemLabelAnchor.INSIDE9) { result = new Point2D.Double(x2, y3); } else if (anchor == ItemLabelAnchor.INSIDE10) { result = new Point2D.Double(x2, y4); } else if (anchor == ItemLabelAnchor.INSIDE11) { result = new Point2D.Double(x2, y4); } else if (anchor == ItemLabelAnchor.INSIDE12) { result = new Point2D.Double(x3, y4); } else if (anchor == ItemLabelAnchor.OUTSIDE1) { result = new Point2D.Double(x5, y6); } else if (anchor == ItemLabelAnchor.OUTSIDE2) { result = new Point2D.Double(x6, y5); } else if (anchor == ItemLabelAnchor.OUTSIDE3) { result = new Point2D.Double(x6, y3); } else if (anchor == ItemLabelAnchor.OUTSIDE4) { result = new Point2D.Double(x6, y1); } else if (anchor == ItemLabelAnchor.OUTSIDE5) { result = new Point2D.Double(x5, y0); } else if (anchor == ItemLabelAnchor.OUTSIDE6) { result = new Point2D.Double(x3, y0); } else if (anchor == ItemLabelAnchor.OUTSIDE7) { result = new Point2D.Double(x1, y0); } else if (anchor == ItemLabelAnchor.OUTSIDE8) { result = new Point2D.Double(x0, y1); } else if (anchor == ItemLabelAnchor.OUTSIDE9) { result = new Point2D.Double(x0, y3); } else if (anchor == ItemLabelAnchor.OUTSIDE10) { result = new Point2D.Double(x0, y5); } else if (anchor == ItemLabelAnchor.OUTSIDE11) { result = new Point2D.Double(x1, y6); } else if (anchor == ItemLabelAnchor.OUTSIDE12) { result = new Point2D.Double(x3, y6); } return result; } /** * Returns <code>true if the specified anchor point is inside a bar. * * @param anchor the anchor point. * * @return A boolean. */ private boolean isInternalAnchor(ItemLabelAnchor anchor) { return anchor == ItemLabelAnchor.CENTER || anchor == ItemLabelAnchor.INSIDE1 || anchor == ItemLabelAnchor.INSIDE2 || anchor == ItemLabelAnchor.INSIDE3 || anchor == ItemLabelAnchor.INSIDE4 || anchor == ItemLabelAnchor.INSIDE5 || anchor == ItemLabelAnchor.INSIDE6 || anchor == ItemLabelAnchor.INSIDE7 || anchor == ItemLabelAnchor.INSIDE8 || anchor == ItemLabelAnchor.INSIDE9 || anchor == ItemLabelAnchor.INSIDE10 || anchor == ItemLabelAnchor.INSIDE11 || anchor == ItemLabelAnchor.INSIDE12; } /** * Tests this instance 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 BarRenderer)) { return false; } BarRenderer that = (BarRenderer) obj; if (this.base != that.base) { return false; } if (this.itemMargin != that.itemMargin) { return false; } if (this.drawBarOutline != that.drawBarOutline) { return false; } if (this.maximumBarWidth != that.maximumBarWidth) { return false; } if (this.minimumBarLength != that.minimumBarLength) { return false; } if (!ObjectUtilities.equal(this.gradientPaintTransformer, that.gradientPaintTransformer)) { return false; } if (!ObjectUtilities.equal(this.positiveItemLabelPositionFallback, that.positiveItemLabelPositionFallback)) { return false; } if (!ObjectUtilities.equal(this.negativeItemLabelPositionFallback, that.negativeItemLabelPositionFallback)) { return false; } if (!this.barPainter.equals(that.barPainter)) { return false; } if (this.shadowsVisible != that.shadowsVisible) { return false; } if (!PaintUtilities.equal(this.shadowPaint, that.shadowPaint)) { return false; } if (this.shadowXOffset != that.shadowXOffset) { return false; } if (this.shadowYOffset != that.shadowYOffset) { return false; } return super.equals(obj); } /** * 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.shadowPaint, 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.shadowPaint = SerialUtilities.readPaint(stream); } }

Other jfreechart examples (source code examples)

Here is a short list of links related to this jfreechart BarRenderer.java source code file:



my book on functional programming

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.