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jfreechart example source code file (RingPlot.java)

This example jfreechart source code file (RingPlot.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, illegalargumentexception, io, line2d, null, paint, paint, pieplotstate, pieplotstate, piesectionentity, rectangle2d, rectangle2d, ringplot, ringplot, rotation, stroke

The jfreechart RingPlot.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.]
 *
 * -------------
 * RingPlot.java
 * -------------
 * (C) Copyright 2004-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limtied);
 * Contributor(s):   Christoph Beck (bug 2121818);
 *
 * Changes
 * -------
 * 08-Nov-2004 : Version 1 (DG);
 * 22-Feb-2005 : Renamed DonutPlot --> RingPlot (DG);
 * 06-Jun-2005 : Added default constructor and fixed equals() method to handle
 *               GradientPaint (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 20-Dec-2005 : Fixed problem with entity shape (bug 1386328) (DG);
 * 27-Sep-2006 : Updated drawItem() method for new lookup methods (DG);
 * 12-Oct-2006 : Added configurable section depth (DG);
 * 14-Feb-2007 : Added notification in setSectionDepth() method (DG);
 * 23-Sep-2008 : Fix for bug 2121818 by Christoph Beck (DG);
 *
 */

package org.jfree.chart.plot;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Shape;
import java.awt.Stroke;
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 java.io.Serializable;

import org.jfree.chart.entity.EntityCollection;
import org.jfree.chart.entity.PieSectionEntity;
import org.jfree.chart.event.PlotChangeEvent;
import org.jfree.chart.labels.PieToolTipGenerator;
import org.jfree.chart.urls.PieURLGenerator;
import org.jfree.data.general.PieDataset;
import org.jfree.io.SerialUtilities;
import org.jfree.ui.RectangleInsets;
import org.jfree.util.ObjectUtilities;
import org.jfree.util.PaintUtilities;
import org.jfree.util.Rotation;
import org.jfree.util.ShapeUtilities;
import org.jfree.util.UnitType;

/**
 * A customised pie plot that leaves a hole in the middle.
 */
public class RingPlot extends PiePlot implements Cloneable, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = 1556064784129676620L;

    /**
     * A flag that controls whether or not separators are drawn between the
     * sections of the chart.
     */
    private boolean separatorsVisible;

    /** The stroke used to draw separators. */
    private transient Stroke separatorStroke;

    /** The paint used to draw separators. */
    private transient Paint separatorPaint;

    /**
     * The length of the inner separator extension (as a percentage of the
     * depth of the sections).
     */
    private double innerSeparatorExtension;

    /**
     * The length of the outer separator extension (as a percentage of the
     * depth of the sections).
     */
    private double outerSeparatorExtension;

    /**
     * The depth of the section as a percentage of the diameter.
     */
    private double sectionDepth;

    /**
     * Creates a new plot with a <code>null dataset.
     */
    public RingPlot() {
        this(null);
    }

    /**
     * Creates a new plot for the specified dataset.
     *
     * @param dataset  the dataset (<code>null permitted).
     */
    public RingPlot(PieDataset dataset) {
        super(dataset);
        this.separatorsVisible = true;
        this.separatorStroke = new BasicStroke(0.5f);
        this.separatorPaint = Color.gray;
        this.innerSeparatorExtension = 0.20;  // twenty percent
        this.outerSeparatorExtension = 0.20;  // twenty percent
        this.sectionDepth = 0.20; // 20%
    }

    /**
     * Returns a flag that indicates whether or not separators are drawn between
     * the sections in the chart.
     *
     * @return A boolean.
     *
     * @see #setSeparatorsVisible(boolean)
     */
    public boolean getSeparatorsVisible() {
        return this.separatorsVisible;
    }

    /**
     * Sets the flag that controls whether or not separators are drawn between
     * the sections in the chart, and sends a {@link PlotChangeEvent} to all
     * registered listeners.
     *
     * @param visible  the flag.
     *
     * @see #getSeparatorsVisible()
     */
    public void setSeparatorsVisible(boolean visible) {
        this.separatorsVisible = visible;
        fireChangeEvent();
    }

    /**
     * Returns the separator stroke.
     *
     * @return The stroke (never <code>null).
     *
     * @see #setSeparatorStroke(Stroke)
     */
    public Stroke getSeparatorStroke() {
        return this.separatorStroke;
    }

    /**
     * Sets the stroke used to draw the separator between sections and sends
     * a {@link PlotChangeEvent} to all registered listeners.
     *
     * @param stroke  the stroke (<code>null not permitted).
     *
     * @see #getSeparatorStroke()
     */
    public void setSeparatorStroke(Stroke stroke) {
        if (stroke == null) {
            throw new IllegalArgumentException("Null 'stroke' argument.");
        }
        this.separatorStroke = stroke;
        fireChangeEvent();
    }

    /**
     * Returns the separator paint.
     *
     * @return The paint (never <code>null).
     *
     * @see #setSeparatorPaint(Paint)
     */
    public Paint getSeparatorPaint() {
        return this.separatorPaint;
    }

    /**
     * Sets the paint used to draw the separator between sections and sends a
     * {@link PlotChangeEvent} to all registered listeners.
     *
     * @param paint  the paint (<code>null not permitted).
     *
     * @see #getSeparatorPaint()
     */
    public void setSeparatorPaint(Paint paint) {
        if (paint == null) {
            throw new IllegalArgumentException("Null 'paint' argument.");
        }
        this.separatorPaint = paint;
        fireChangeEvent();
    }

    /**
     * Returns the length of the inner extension of the separator line that
     * is drawn between sections, expressed as a percentage of the depth of
     * the section.
     *
     * @return The inner separator extension (as a percentage).
     *
     * @see #setInnerSeparatorExtension(double)
     */
    public double getInnerSeparatorExtension() {
        return this.innerSeparatorExtension;
    }

    /**
     * Sets the length of the inner extension of the separator line that is
     * drawn between sections, as a percentage of the depth of the
     * sections, and sends a {@link PlotChangeEvent} to all registered
     * listeners.
     *
     * @param percent  the percentage.
     *
     * @see #getInnerSeparatorExtension()
     * @see #setOuterSeparatorExtension(double)
     */
    public void setInnerSeparatorExtension(double percent) {
        this.innerSeparatorExtension = percent;
        fireChangeEvent();
    }

    /**
     * Returns the length of the outer extension of the separator line that
     * is drawn between sections, expressed as a percentage of the depth of
     * the section.
     *
     * @return The outer separator extension (as a percentage).
     *
     * @see #setOuterSeparatorExtension(double)
     */
    public double getOuterSeparatorExtension() {
        return this.outerSeparatorExtension;
    }

    /**
     * Sets the length of the outer extension of the separator line that is
     * drawn between sections, as a percentage of the depth of the
     * sections, and sends a {@link PlotChangeEvent} to all registered
     * listeners.
     *
     * @param percent  the percentage.
     *
     * @see #getOuterSeparatorExtension()
     */
    public void setOuterSeparatorExtension(double percent) {
        this.outerSeparatorExtension = percent;
        fireChangeEvent();
    }

    /**
     * Returns the depth of each section, expressed as a percentage of the
     * plot radius.
     *
     * @return The depth of each section.
     *
     * @see #setSectionDepth(double)
     * @since 1.0.3
     */
    public double getSectionDepth() {
        return this.sectionDepth;
    }

    /**
     * The section depth is given as percentage of the plot radius.
     * Specifying 1.0 results in a straightforward pie chart.
     *
     * @param sectionDepth  the section depth.
     *
     * @see #getSectionDepth()
     * @since 1.0.3
     */
    public void setSectionDepth(double sectionDepth) {
        this.sectionDepth = sectionDepth;
        fireChangeEvent();
    }

    /**
     * Initialises the plot state (which will store the total of all dataset
     * values, among other things).  This method is called once at the
     * beginning of each drawing.
     *
     * @param g2  the graphics device.
     * @param plotArea  the plot area (<code>null not permitted).
     * @param plot  the plot.
     * @param index  the secondary index (<code>null for primary
     *               renderer).
     * @param info  collects chart rendering information for return to caller.
     *
     * @return A state object (maintains state information relevant to one
     *         chart drawing).
     */
    public PiePlotState initialise(Graphics2D g2, Rectangle2D plotArea,
            PiePlot plot, Integer index, PlotRenderingInfo info) {

        PiePlotState state = super.initialise(g2, plotArea, plot, index, info);
        state.setPassesRequired(3);
        return state;

    }

    /**
     * Draws a single data item.
     *
     * @param g2  the graphics device (<code>null not permitted).
     * @param section  the section index.
     * @param dataArea  the data plot area.
     * @param state  state information for one chart.
     * @param currentPass  the current pass index.
     */
    protected void drawItem(Graphics2D g2,
                            int section,
                            Rectangle2D dataArea,
                            PiePlotState state,
                            int currentPass) {

        PieDataset dataset = getDataset();
        Number n = dataset.getValue(section);
        if (n == null) {
            return;
        }
        double value = n.doubleValue();
        double angle1 = 0.0;
        double angle2 = 0.0;

        Rotation direction = getDirection();
        if (direction == Rotation.CLOCKWISE) {
            angle1 = state.getLatestAngle();
            angle2 = angle1 - value / state.getTotal() * 360.0;
        }
        else if (direction == Rotation.ANTICLOCKWISE) {
            angle1 = state.getLatestAngle();
            angle2 = angle1 + value / state.getTotal() * 360.0;
        }
        else {
            throw new IllegalStateException("Rotation type not recognised.");
        }

        double angle = (angle2 - angle1);
        if (Math.abs(angle) > getMinimumArcAngleToDraw()) {
            Comparable key = getSectionKey(section);
            double ep = 0.0;
            double mep = getMaximumExplodePercent();
            if (mep > 0.0) {
                ep = getExplodePercent(key) / mep;
            }
            Rectangle2D arcBounds = getArcBounds(state.getPieArea(),
                    state.getExplodedPieArea(), angle1, angle, ep);
            Arc2D.Double arc = new Arc2D.Double(arcBounds, angle1, angle,
                    Arc2D.OPEN);

            // create the bounds for the inner arc
            double depth = this.sectionDepth / 2.0;
            RectangleInsets s = new RectangleInsets(UnitType.RELATIVE,
                depth, depth, depth, depth);
            Rectangle2D innerArcBounds = new Rectangle2D.Double();
            innerArcBounds.setRect(arcBounds);
            s.trim(innerArcBounds);
            // calculate inner arc in reverse direction, for later
            // GeneralPath construction
            Arc2D.Double arc2 = new Arc2D.Double(innerArcBounds, angle1
                    + angle, -angle, Arc2D.OPEN);
            GeneralPath path = new GeneralPath();
            path.moveTo((float) arc.getStartPoint().getX(),
                    (float) arc.getStartPoint().getY());
            path.append(arc.getPathIterator(null), false);
            path.append(arc2.getPathIterator(null), true);
            path.closePath();

            Line2D separator = new Line2D.Double(arc2.getEndPoint(),
                    arc.getStartPoint());

            if (currentPass == 0) {
                Paint shadowPaint = getShadowPaint();
                double shadowXOffset = getShadowXOffset();
                double shadowYOffset = getShadowYOffset();
                if (shadowPaint != null) {
                    Shape shadowArc = ShapeUtilities.createTranslatedShape(
                            path, (float) shadowXOffset, (float) shadowYOffset);
                    g2.setPaint(shadowPaint);
                    g2.fill(shadowArc);
                }
            }
            else if (currentPass == 1) {
                Paint paint = lookupSectionPaint(key);
                g2.setPaint(paint);
                g2.fill(path);
                Paint outlinePaint = lookupSectionOutlinePaint(key);
                Stroke outlineStroke = lookupSectionOutlineStroke(key);
                if (outlinePaint != null && outlineStroke != null) {
                    g2.setPaint(outlinePaint);
                    g2.setStroke(outlineStroke);
                    g2.draw(path);
                }

                // add an entity for the pie section
                if (state.getInfo() != null) {
                    EntityCollection entities = state.getEntityCollection();
                    if (entities != null) {
                        String tip = null;
                        PieToolTipGenerator toolTipGenerator
                                = getToolTipGenerator();
                        if (toolTipGenerator != null) {
                            tip = toolTipGenerator.generateToolTip(dataset,
                                    key);
                        }
                        String url = null;
                        PieURLGenerator urlGenerator = getURLGenerator();
                        if (urlGenerator != null) {
                            url = urlGenerator.generateURL(dataset, key,
                                    getPieIndex());
                        }
                        PieSectionEntity entity = new PieSectionEntity(path,
                                dataset, getPieIndex(), section, key, tip,
                                url);
                        entities.add(entity);
                    }
                }
            }
            else if (currentPass == 2) {
                if (this.separatorsVisible) {
                    Line2D extendedSeparator = extendLine(separator,
                        this.innerSeparatorExtension,
                        this.outerSeparatorExtension);
                    g2.setStroke(this.separatorStroke);
                    g2.setPaint(this.separatorPaint);
                    g2.draw(extendedSeparator);
                }
            }
        }
        state.setLatestAngle(angle2);
    }

    /**
     * This method overrides the default value for cases where the ring plot
     * is very thin.  This fixes bug 2121818.
     *
     * @return The label link depth, as a percentage of the plot's radius.
     */
    protected double getLabelLinkDepth() {
        return Math.min(super.getLabelLinkDepth(), getSectionDepth() / 2);
    }

    /**
     * Tests this plot for equality with an arbitrary object.
     *
     * @param obj  the object to test against (<code>null permitted).
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (!(obj instanceof RingPlot)) {
            return false;
        }
        RingPlot that = (RingPlot) obj;
        if (this.separatorsVisible != that.separatorsVisible) {
            return false;
        }
        if (!ObjectUtilities.equal(this.separatorStroke,
                that.separatorStroke)) {
            return false;
        }
        if (!PaintUtilities.equal(this.separatorPaint, that.separatorPaint)) {
            return false;
        }
        if (this.innerSeparatorExtension != that.innerSeparatorExtension) {
            return false;
        }
        if (this.outerSeparatorExtension != that.outerSeparatorExtension) {
            return false;
        }
        if (this.sectionDepth != that.sectionDepth) {
            return false;
        }
        return super.equals(obj);
    }

    /**
     * Creates a new line by extending an existing line.
     *
     * @param line  the line (<code>null not permitted).
     * @param startPercent  the amount to extend the line at the start point
     *                      end.
     * @param endPercent  the amount to extend the line at the end point end.
     *
     * @return A new line.
     */
    private Line2D extendLine(Line2D line, double startPercent,
                              double endPercent) {
        if (line == null) {
            throw new IllegalArgumentException("Null 'line' argument.");
        }
        double x1 = line.getX1();
        double x2 = line.getX2();
        double deltaX = x2 - x1;
        double y1 = line.getY1();
        double y2 = line.getY2();
        double deltaY = y2 - y1;
        x1 = x1 - (startPercent * deltaX);
        y1 = y1 - (startPercent * deltaY);
        x2 = x2 + (endPercent * deltaX);
        y2 = y2 + (endPercent * deltaY);
        return new Line2D.Double(x1, y1, x2, y2);
    }

    /**
     * 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.separatorStroke, stream);
        SerialUtilities.writePaint(this.separatorPaint, 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.separatorStroke = SerialUtilities.readStroke(stream);
        this.separatorPaint = SerialUtilities.readPaint(stream);
    }

}

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