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jfreechart example source code file (MinMaxCategoryRenderer.java)

This example jfreechart source code file (MinMaxCategoryRenderer.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, generalpath, geometry, graphics, graphics2d, gui, icon, icon, illegalargumentexception, illegalargumentexception, io, minmaxcategoryrenderer, minmaxcategoryrenderer, null, null, number, paint, stroke, swing

The jfreechart MinMaxCategoryRenderer.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.]
 *
 * ---------------------------
 * MinMaxCategoryRenderer.java
 * ---------------------------
 * (C) Copyright 2002-2008, by Object Refinery Limited.
 *
 * Original Author:  Tomer Peretz;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *                   Christian W. Zuckschwerdt;
 *                   Nicolas Brodu (for Astrium and EADS Corporate Research
 *                   Center);
 *
 * Changes:
 * --------
 * 29-May-2002 : Version 1 (TP);
 * 02-Oct-2002 : Fixed errors reported by Checkstyle (DG);
 * 24-Oct-2002 : Amendments for changes in CategoryDataset interface and
 *               CategoryToolTipGenerator interface (DG);
 * 05-Nov-2002 : Base dataset is now TableDataset not CategoryDataset (DG);
 * 17-Jan-2003 : Moved plot classes to a separate package (DG);
 * 10-Apr-2003 : Changed CategoryDataset to KeyedValues2DDataset in drawItem()
 *               method (DG);
 * 30-Jul-2003 : Modified entity constructor (CZ);
 * 08-Sep-2003 : Implemented Serializable (NB);
 * 29-Oct-2003 : Added workaround for font alignment in PDF output (DG);
 * 05-Nov-2004 : Modified drawItem() signature (DG);
 * 17-Nov-2005 : Added change events and argument checks (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 02-Feb-2007 : Removed author tags all over JFreeChart sources (DG);
 * 09-Mar-2007 : Fixed problem with horizontal rendering (DG);
 * 28-Sep-2007 : Added equals() method override (DG);
 *
 */

package org.jfree.chart.renderer.category;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.geom.AffineTransform;
import java.awt.geom.Arc2D;
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 javax.swing.Icon;

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.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.category.CategoryDataset;
import org.jfree.io.SerialUtilities;
import org.jfree.util.PaintUtilities;

/**
 * Renderer for drawing min max plot. This renderer draws all the series under
 * the same category in the same x position using <code>objectIcon and
 * a line from the maximum value to the minimum value. For use with the
 * {@link CategoryPlot} class. The example shown here is generated by
 * the <code>MinMaxCategoryPlotDemo1.java program included in the
 * JFreeChart Demo Collection:
 * <br>
* <img src="../../../../../images/MinMaxCategoryRendererSample.png" * alt="MinMaxCategoryRendererSample.png" /> */ public class MinMaxCategoryRenderer extends AbstractCategoryItemRenderer { /** For serialization. */ private static final long serialVersionUID = 2935615937671064911L; /** A flag indicating whether or not lines are drawn between XY points. */ private boolean plotLines = false; /** * The paint of the line between the minimum value and the maximum value. */ private transient Paint groupPaint = Color.black; /** * The stroke of the line between the minimum value and the maximum value. */ private transient Stroke groupStroke = new BasicStroke(1.0f); /** The icon used to indicate the minimum value.*/ private transient Icon minIcon = getIcon(new Arc2D.Double(-4, -4, 8, 8, 0, 360, Arc2D.OPEN), null, Color.black); /** The icon used to indicate the maximum value.*/ private transient Icon maxIcon = getIcon(new Arc2D.Double(-4, -4, 8, 8, 0, 360, Arc2D.OPEN), null, Color.black); /** The icon used to indicate the values.*/ private transient Icon objectIcon = getIcon(new Line2D.Double(-4, 0, 4, 0), false, true); /** The last category. */ private int lastCategory = -1; /** The minimum. */ private double min; /** The maximum. */ private double max; /** * Default constructor. */ public MinMaxCategoryRenderer() { super(); } /** * Gets whether or not lines are drawn between category points. * * @return boolean true if line will be drawn between sequenced categories, * otherwise false. * * @see #setDrawLines(boolean) */ public boolean isDrawLines() { return this.plotLines; } /** * Sets the flag that controls whether or not lines are drawn to connect * the items within a series and sends a {@link RendererChangeEvent} to * all registered listeners. * * @param draw the new value of the flag. * * @see #isDrawLines() */ public void setDrawLines(boolean draw) { if (this.plotLines != draw) { this.plotLines = draw; fireChangeEvent(); } } /** * Returns the paint used to draw the line between the minimum and maximum * value items in each category. * * @return The paint (never <code>null). * * @see #setGroupPaint(Paint) */ public Paint getGroupPaint() { return this.groupPaint; } /** * Sets the paint used to draw the line between the minimum and maximum * value items in each category and sends a {@link RendererChangeEvent} to * all registered listeners. * * @param paint the paint (<code>null not permitted). * * @see #getGroupPaint() */ public void setGroupPaint(Paint paint) { if (paint == null) { throw new IllegalArgumentException("Null 'paint' argument."); } this.groupPaint = paint; fireChangeEvent(); } /** * Returns the stroke used to draw the line between the minimum and maximum * value items in each category. * * @return The stroke (never <code>null). * * @see #setGroupStroke(Stroke) */ public Stroke getGroupStroke() { return this.groupStroke; } /** * Sets the stroke of the line between the minimum value and the maximum * value and sends a {@link RendererChangeEvent} to all registered * listeners. * * @param stroke the new stroke (<code>null not permitted). */ public void setGroupStroke(Stroke stroke) { if (stroke == null) { throw new IllegalArgumentException("Null 'stroke' argument."); } this.groupStroke = stroke; fireChangeEvent(); } /** * Returns the icon drawn for each data item. * * @return The icon (never <code>null). * * @see #setObjectIcon(Icon) */ public Icon getObjectIcon() { return this.objectIcon; } /** * Sets the icon drawn for each data item and sends a * {@link RendererChangeEvent} to all registered listeners. * * @param icon the icon. * * @see #getObjectIcon() */ public void setObjectIcon(Icon icon) { if (icon == null) { throw new IllegalArgumentException("Null 'icon' argument."); } this.objectIcon = icon; fireChangeEvent(); } /** * Returns the icon displayed for the maximum value data item within each * category. * * @return The icon (never <code>null). * * @see #setMaxIcon(Icon) */ public Icon getMaxIcon() { return this.maxIcon; } /** * Sets the icon displayed for the maximum value data item within each * category and sends a {@link RendererChangeEvent} to all registered * listeners. * * @param icon the icon (<code>null not permitted). * * @see #getMaxIcon() */ public void setMaxIcon(Icon icon) { if (icon == null) { throw new IllegalArgumentException("Null 'icon' argument."); } this.maxIcon = icon; fireChangeEvent(); } /** * Returns the icon displayed for the minimum value data item within each * category. * * @return The icon (never <code>null). * * @see #setMinIcon(Icon) */ public Icon getMinIcon() { return this.minIcon; } /** * Sets the icon displayed for the minimum value data item within each * category and sends a {@link RendererChangeEvent} to all registered * listeners. * * @param icon the icon (<code>null not permitted). * * @see #getMinIcon() */ public void setMinIcon(Icon icon) { if (icon == null) { throw new IllegalArgumentException("Null 'icon' argument."); } this.minIcon = icon; fireChangeEvent(); } /** * Draw a single data item. * * @param g2 the graphics device. * @param state the renderer state. * @param dataArea the area in which the data is drawn. * @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) { // first check the number we are plotting... Number value = dataset.getValue(row, column); if (value != null) { // current data point... double x1 = domainAxis.getCategoryMiddle(column, getColumnCount(), dataArea, plot.getDomainAxisEdge()); double y1 = rangeAxis.valueToJava2D(value.doubleValue(), dataArea, plot.getRangeAxisEdge()); g2.setPaint(getItemPaint(row, column)); g2.setStroke(getItemStroke(row, column)); Shape shape = null; shape = new Rectangle2D.Double(x1 - 4, y1 - 4, 8.0, 8.0); PlotOrientation orient = plot.getOrientation(); if (orient == PlotOrientation.VERTICAL) { this.objectIcon.paintIcon(null, g2, (int) x1, (int) y1); } else { this.objectIcon.paintIcon(null, g2, (int) y1, (int) x1); } if (this.lastCategory == column) { if (this.min > value.doubleValue()) { this.min = value.doubleValue(); } if (this.max < value.doubleValue()) { this.max = value.doubleValue(); } // last series, so we are ready to draw the min and max if (dataset.getRowCount() - 1 == row) { g2.setPaint(this.groupPaint); g2.setStroke(this.groupStroke); double minY = rangeAxis.valueToJava2D(this.min, dataArea, plot.getRangeAxisEdge()); double maxY = rangeAxis.valueToJava2D(this.max, dataArea, plot.getRangeAxisEdge()); if (orient == PlotOrientation.VERTICAL) { g2.draw(new Line2D.Double(x1, minY, x1, maxY)); this.minIcon.paintIcon(null, g2, (int) x1, (int) minY); this.maxIcon.paintIcon(null, g2, (int) x1, (int) maxY); } else { g2.draw(new Line2D.Double(minY, x1, maxY, x1)); this.minIcon.paintIcon(null, g2, (int) minY, (int) x1); this.maxIcon.paintIcon(null, g2, (int) maxY, (int) x1); } } } else { // reset the min and max this.lastCategory = column; this.min = value.doubleValue(); this.max = value.doubleValue(); } // connect to the previous point if (this.plotLines) { if (column != 0) { Number previousValue = dataset.getValue(row, column - 1); if (previousValue != null) { // previous data point... double previous = previousValue.doubleValue(); double x0 = domainAxis.getCategoryMiddle(column - 1, getColumnCount(), dataArea, plot.getDomainAxisEdge()); double y0 = rangeAxis.valueToJava2D(previous, dataArea, plot.getRangeAxisEdge()); g2.setPaint(getItemPaint(row, column)); g2.setStroke(getItemStroke(row, column)); Line2D line; if (orient == PlotOrientation.VERTICAL) { line = new Line2D.Double(x0, y0, x1, y1); } else { line = new Line2D.Double(y0, x0, y1, x1); } g2.draw(line); } } } // add an item entity, if this information is being collected EntityCollection entities = state.getEntityCollection(); if (entities != null && shape != null) { addItemEntity(entities, dataset, row, column, shape); } } } /** * Tests this instance for equality with an arbitrary object. The icon * fields are NOT included in the test, so this implementation is a little * weak. * * @param obj the object (<code>null permitted). * * @return A boolean. * * @since 1.0.7 */ public boolean equals(Object obj) { if (obj == this) { return true; } if (!(obj instanceof MinMaxCategoryRenderer)) { return false; } MinMaxCategoryRenderer that = (MinMaxCategoryRenderer) obj; if (this.plotLines != that.plotLines) { return false; } if (!PaintUtilities.equal(this.groupPaint, that.groupPaint)) { return false; } if (!this.groupStroke.equals(that.groupStroke)) { return false; } return super.equals(obj); } /** * Returns an icon. * * @param shape the shape. * @param fillPaint the fill paint. * @param outlinePaint the outline paint. * * @return The icon. */ private Icon getIcon(Shape shape, final Paint fillPaint, final Paint outlinePaint) { final int width = shape.getBounds().width; final int height = shape.getBounds().height; final GeneralPath path = new GeneralPath(shape); return new Icon() { public void paintIcon(Component c, Graphics g, int x, int y) { Graphics2D g2 = (Graphics2D) g; path.transform(AffineTransform.getTranslateInstance(x, y)); if (fillPaint != null) { g2.setPaint(fillPaint); g2.fill(path); } if (outlinePaint != null) { g2.setPaint(outlinePaint); g2.draw(path); } path.transform(AffineTransform.getTranslateInstance(-x, -y)); } public int getIconWidth() { return width; } public int getIconHeight() { return height; } }; } /** * Returns an icon from a shape. * * @param shape the shape. * @param fill the fill flag. * @param outline the outline flag. * * @return The icon. */ private Icon getIcon(Shape shape, final boolean fill, final boolean outline) { final int width = shape.getBounds().width; final int height = shape.getBounds().height; final GeneralPath path = new GeneralPath(shape); return new Icon() { public void paintIcon(Component c, Graphics g, int x, int y) { Graphics2D g2 = (Graphics2D) g; path.transform(AffineTransform.getTranslateInstance(x, y)); if (fill) { g2.fill(path); } if (outline) { g2.draw(path); } path.transform(AffineTransform.getTranslateInstance(-x, -y)); } public int getIconWidth() { return width; } public int getIconHeight() { return height; } }; } /** * 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.writeStroke(this.groupStroke, stream); SerialUtilities.writePaint(this.groupPaint, 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.groupStroke = SerialUtilities.readStroke(stream); this.groupPaint = SerialUtilities.readPaint(stream); this.minIcon = getIcon(new Arc2D.Double(-4, -4, 8, 8, 0, 360, Arc2D.OPEN), null, Color.black); this.maxIcon = getIcon(new Arc2D.Double(-4, -4, 8, 8, 0, 360, Arc2D.OPEN), null, Color.black); this.objectIcon = getIcon(new Line2D.Double(-4, 0, 4, 0), false, true); } }

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