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JFreeChart is a class library, written in Java, for generating charts. Utilising the Java2D APIs, it currently supports bar charts, pie charts, line charts, XY-plots and time series plots.
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/* ===========================================================
 * 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.]
 *
 * ----------------------
 * PolarItemRenderer.java
 * ----------------------
 * (C) Copyright 2004-2008, by Solution Engineering, Inc. and Contributors.
 *
 * Original Author:  Daniel Bridenbecker, Solution Engineering, Inc.;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * Changes
 * -------
 * 19-Jan-2004 : Version 1, contributed by DB with minor changes by DG (DG);
 *
 */

package org.jfree.chart.renderer;

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

import org.jfree.chart.LegendItem;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.event.RendererChangeListener;
import org.jfree.chart.plot.PlotRenderingInfo;
import org.jfree.chart.plot.PolarPlot;
import org.jfree.data.xy.XYDataset;

/**
 * The interface for a renderer that can be used by the {@link PolarPlot} class.
 */
public interface PolarItemRenderer {

    /**
     * Plots the data for a given series.
     *
     * @param g2  the drawing surface.
     * @param dataArea  the data area.
     * @param info  collects plot rendering info.
     * @param plot  the plot.
     * @param dataset  the dataset.
     * @param seriesIndex  the series index.
     */
    public void drawSeries(Graphics2D g2,
                           Rectangle2D dataArea,
                           PlotRenderingInfo info,
                           PolarPlot plot,
                           XYDataset dataset,
                           int seriesIndex);

    /**
     * Draw the angular gridlines - the spokes.
     *
     * @param g2  the drawing surface.
     * @param plot  the plot.
     * @param ticks  the ticks.
     * @param dataArea  the data area.
     */
    public void drawAngularGridLines(Graphics2D g2,
                                     PolarPlot plot,
                                     List ticks,
                                     Rectangle2D dataArea);

    /**
     * Draw the radial gridlines - the rings.
     *
     * @param g2  the drawing surface.
     * @param plot  the plot.
     * @param radialAxis  the radial axis.
     * @param ticks  the ticks.
     * @param dataArea  the data area.
     */
    public void drawRadialGridLines(Graphics2D g2,
                                    PolarPlot plot,
                                    ValueAxis radialAxis,
                                    List ticks,
                                    Rectangle2D dataArea);

    /**
     * Return the legend for the given series.
     *
     * @param series  the series index.
     *
     * @return The legend item.
     */
    public LegendItem getLegendItem(int series);

    /**
     * Returns the plot that this renderer has been assigned to.
     *
     * @return The plot.
     */
    public PolarPlot getPlot();

    /**
     * Sets the plot that this renderer is assigned to.
     * 
     * This method will be called by the plot class...you do not need to call
     * it yourself.
     *
     * @param plot  the plot.
     */
    public void setPlot(PolarPlot plot);

    /**
     * Adds a change listener.
     *
     * @param listener  the listener.
     */
    public void addChangeListener(RendererChangeListener listener);

    /**
     * Removes a change listener.
     *
     * @param listener  the listener.
     */
    public void removeChangeListener(RendererChangeListener listener);


}