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

jfreechart example source code file (

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

Java - jfreechart tags/keywords

awt, clonenotsupportedexception, geometry, intervalxydataset, io, paint, plotorientation, rectangleedge, rectangleedge, shape, shape, valueaxis, xydataset, xyitemlabelgenerator, xyitemlabelgenerator, yintervalrenderer, yintervalrenderer

The jfreechart source code

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 * (C) Copyright 2000-2009, by Object Refinery Limited and Contributors.
 * Project Info:
 * 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.]
 * ----------------------
 * ----------------------
 * (C) Copyright 2002-2009, by Object Refinery Limited.
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 * Changes
 * -------
 * 05-Nov-2002 : Version 1 (DG);
 * 25-Mar-2003 : Implemented Serializable (DG);
 * 01-May-2003 : Modified drawItem() method signature (DG);
 * 20-Aug-2003 : Implemented Cloneable and PublicCloneable (DG);
 * 16-Sep-2003 : Changed ChartRenderingInfo --> PlotRenderingInfo (DG);
 * 25-Feb-2004 : Replaced CrosshairInfo with CrosshairState (DG);
 * 27-Sep-2004 : Access double values from dataset (DG);
 * 11-Nov-2004 : Now uses ShapeUtilities to translate shapes (DG);
 * 11-Apr-2008 : New override for findRangeBounds() (DG);
 * 26-May-2008 : Added item label support (DG);
 * 27-Mar-2009 : Updated findRangeBounds() (DG);

package org.jfree.chart.renderer.xy;

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 org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.entity.EntityCollection;
import org.jfree.chart.event.RendererChangeEvent;
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.text.TextUtilities;
import org.jfree.ui.RectangleEdge;
import org.jfree.util.ObjectUtilities;
import org.jfree.util.PublicCloneable;
import org.jfree.util.ShapeUtilities;

 * A renderer that draws a line connecting the start and end Y values for an
 * {@link XYPlot}.  The example shown here is generated by the
 * <code> program included in the JFreeChart
 * demo collection:
 * <br>
* <img src="../../../../../images/YIntervalRendererSample.png" * alt="YIntervalRendererSample.png" /> */ public class YIntervalRenderer extends AbstractXYItemRenderer implements XYItemRenderer, Cloneable, PublicCloneable, Serializable { /** For serialization. */ private static final long serialVersionUID = -2951586537224143260L; /** * An additional item label generator. If this is non-null, the item * label generated will be displayed near the lower y-value at the * position given by getNegativeItemLabelPosition(). * * @since 1.0.10 */ private XYItemLabelGenerator additionalItemLabelGenerator; /** * The default constructor. */ public YIntervalRenderer() { super(); this.additionalItemLabelGenerator = null; } /** * Returns the generator for the item labels that appear near the lower * y-value. * * @return The generator (possibly <code>null). * * @see #setAdditionalItemLabelGenerator(XYItemLabelGenerator) * * @since 1.0.10 */ public XYItemLabelGenerator getAdditionalItemLabelGenerator() { return this.additionalItemLabelGenerator; } /** * Sets the generator for the item labels that appear near the lower * y-value and sends a {@link RendererChangeEvent} to all registered * listeners. If this is set to <code>null, no item labels will be * drawn. * * @param generator the generator (<code>null permitted). * * @see #getAdditionalItemLabelGenerator() * * @since 1.0.10 */ public void setAdditionalItemLabelGenerator( XYItemLabelGenerator generator) { this.additionalItemLabelGenerator = generator; fireChangeEvent(); } /** * 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) { return findRangeBounds(dataset, true); } /** * 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 (ignored here). */ 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) { // setup for collecting optional entity info... EntityCollection entities = null; if (info != null) { entities = info.getOwner().getEntityCollection(); } IntervalXYDataset intervalDataset = (IntervalXYDataset) dataset; double x = intervalDataset.getXValue(series, item); double yLow = intervalDataset.getStartYValue(series, item); double yHigh = intervalDataset.getEndYValue(series, item); RectangleEdge xAxisLocation = plot.getDomainAxisEdge(); RectangleEdge yAxisLocation = plot.getRangeAxisEdge(); double xx = domainAxis.valueToJava2D(x, dataArea, xAxisLocation); double yyLow = rangeAxis.valueToJava2D(yLow, dataArea, yAxisLocation); double yyHigh = rangeAxis.valueToJava2D(yHigh, dataArea, yAxisLocation); Paint p = getItemPaint(series, item); Stroke s = getItemStroke(series, item); Line2D line = null; Shape shape = getItemShape(series, item); Shape top = null; Shape bottom = null; PlotOrientation orientation = plot.getOrientation(); if (orientation == PlotOrientation.HORIZONTAL) { line = new Line2D.Double(yyLow, xx, yyHigh, xx); top = ShapeUtilities.createTranslatedShape(shape, yyHigh, xx); bottom = ShapeUtilities.createTranslatedShape(shape, yyLow, xx); } else if (orientation == PlotOrientation.VERTICAL) { line = new Line2D.Double(xx, yyLow, xx, yyHigh); top = ShapeUtilities.createTranslatedShape(shape, xx, yyHigh); bottom = ShapeUtilities.createTranslatedShape(shape, xx, yyLow); } g2.setPaint(p); g2.setStroke(s); g2.draw(line); g2.fill(top); g2.fill(bottom); // for item labels, we have a special case because there is the // possibility to draw (a) the regular item label near to just the // upper y-value, or (b) the regular item label near the upper y-value // PLUS an additional item label near the lower y-value. if (isItemLabelVisible(series, item)) { drawItemLabel(g2, orientation, dataset, series, item, xx, yyHigh, false); drawAdditionalItemLabel(g2, orientation, dataset, series, item, xx, yyLow); } // add an entity for the item... if (entities != null) { addEntity(entities, line.getBounds(), dataset, series, item, 0.0, 0.0); } } /** * Draws an item label. * * @param g2 the graphics device. * @param orientation the orientation. * @param dataset the dataset. * @param series the series index (zero-based). * @param item the item index (zero-based). * @param x the x coordinate (in Java2D space). * @param y the y coordinate (in Java2D space). * @param negative indicates a negative value (which affects the item * label position). */ private void drawAdditionalItemLabel(Graphics2D g2, PlotOrientation orientation, XYDataset dataset, int series, int item, double x, double y) { if (this.additionalItemLabelGenerator == null) { return; } Font labelFont = getItemLabelFont(series, item); Paint paint = getItemLabelPaint(series, item); g2.setFont(labelFont); g2.setPaint(paint); String label = this.additionalItemLabelGenerator.generateLabel(dataset, series, item); ItemLabelPosition position = getNegativeItemLabelPosition(series, item); Point2D anchorPoint = calculateLabelAnchorPoint( position.getItemLabelAnchor(), x, y, orientation); TextUtilities.drawRotatedString(label, g2, (float) anchorPoint.getX(), (float) anchorPoint.getY(), position.getTextAnchor(), position.getAngle(), position.getRotationAnchor()); } /** * 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 YIntervalRenderer)) { return false; } YIntervalRenderer that = (YIntervalRenderer) obj; if (!ObjectUtilities.equal(this.additionalItemLabelGenerator, that.additionalItemLabelGenerator)) { return false; } return super.equals(obj); } /** * Returns a clone of the renderer. * * @return A clone. * * @throws CloneNotSupportedException if the renderer cannot be cloned. */ public Object clone() throws CloneNotSupportedException { return super.clone(); } }

Other jfreechart examples (source code examples)

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

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller


new blog posts


Copyright 1998-2021 Alvin Alexander,
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.