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jfreechart example source code file (DefaultPolarItemRenderer.java)

This example jfreechart source code file (DefaultPolarItemRenderer.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, booleanlist, defaultpolaritemrenderer, defaultpolaritemrenderer, geometry, iterator, legenditem, numbertick, numbertick, paint, point, point, polarplot, polarplot, rectangle2d, util, xydataset

The jfreechart DefaultPolarItemRenderer.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.]
 *
 * -----------------------------
 * DefaultPolarItemRenderer.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);
 * 15-Jul-2004 : Switched getX() with getXValue() and getY() with
 *               getYValue() (DG);
 * 04-Oct-2004 : Renamed BooleanUtils --> BooleanUtilities (DG);
 * 20-Apr-2005 : Update for change to LegendItem class (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 04-Aug-2006 : Implemented equals() and clone() (DG);
 * 02-Feb-2007 : Removed author tags from all over JFreeChart sources (DG);
 * 14-Mar-2007 : Fixed clone() method (DG);
 * 04-May-2007 : Fixed lookup for series paint and stroke (DG);
 * 18-May-2007 : Set dataset for LegendItem (DG);
 *
 */

package org.jfree.chart.renderer;

import java.awt.AlphaComposite;
import java.awt.Composite;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Point;
import java.awt.Polygon;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Rectangle2D;
import java.util.Iterator;
import java.util.List;

import org.jfree.chart.LegendItem;
import org.jfree.chart.axis.NumberTick;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.plot.DrawingSupplier;
import org.jfree.chart.plot.PlotRenderingInfo;
import org.jfree.chart.plot.PolarPlot;
import org.jfree.data.xy.XYDataset;
import org.jfree.text.TextUtilities;
import org.jfree.ui.TextAnchor;
import org.jfree.util.BooleanList;
import org.jfree.util.BooleanUtilities;

/**
 * A renderer that can be used with the {@link PolarPlot} class.
 */
public class DefaultPolarItemRenderer extends AbstractRenderer
        implements PolarItemRenderer {

    /** The plot that the renderer is assigned to. */
    private PolarPlot plot;

    /** Flags that control whether the renderer fills each series or not. */
    private BooleanList seriesFilled;

    /**
     * Creates a new instance of DefaultPolarItemRenderer
     */
    public DefaultPolarItemRenderer() {
        this.seriesFilled = new BooleanList();
    }

    /**
     * Set the plot associated with this renderer.
     *
     * @param plot  the plot.
     *
     * @see #getPlot()
     */
    public void setPlot(PolarPlot plot) {
        this.plot = plot;
    }

    /**
     * Return the plot associated with this renderer.
     *
     * @return The plot.
     *
     * @see #setPlot(PolarPlot)
     */
    public PolarPlot getPlot() {
        return this.plot;
    }

    /**
     * Returns the drawing supplier from the plot.
     *
     * @return The drawing supplier.
     */
    public DrawingSupplier getDrawingSupplier() {
        DrawingSupplier result = null;
        PolarPlot p = getPlot();
        if (p != null) {
            result = p.getDrawingSupplier();
        }
        return result;
    }

    /**
     * Returns <code>true if the renderer should fill the specified
     * series, and <code>false otherwise.
     *
     * @param series  the series index (zero-based).
     *
     * @return A boolean.
     */
    public boolean isSeriesFilled(int series) {
        boolean result = false;
        Boolean b = this.seriesFilled.getBoolean(series);
        if (b != null) {
            result = b.booleanValue();
        }
        return result;
    }

    /**
     * Sets a flag that controls whether or not a series is filled.
     *
     * @param series  the series index.
     * @param filled  the flag.
     */
    public void setSeriesFilled(int series, boolean filled) {
        this.seriesFilled.setBoolean(series, BooleanUtilities.valueOf(filled));
    }

    /**
     * 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) {

        Polygon poly = new Polygon();
        int numPoints = dataset.getItemCount(seriesIndex);
        for (int i = 0; i < numPoints; i++) {
            double theta = dataset.getXValue(seriesIndex, i);
            double radius = dataset.getYValue(seriesIndex, i);
            Point p = plot.translateValueThetaRadiusToJava2D(theta, radius,
                    dataArea);
            poly.addPoint(p.x, p.y);
        }
        g2.setPaint(lookupSeriesPaint(seriesIndex));
        g2.setStroke(lookupSeriesStroke(seriesIndex));
        if (isSeriesFilled(seriesIndex)) {
            Composite savedComposite = g2.getComposite();
            g2.setComposite(AlphaComposite.getInstance(
                    AlphaComposite.SRC_OVER, 0.5f));
            g2.fill(poly);
            g2.setComposite(savedComposite);
        }
        else {
            g2.draw(poly);
        }
    }

    /**
     * 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) {

        g2.setFont(plot.getAngleLabelFont());
        g2.setStroke(plot.getAngleGridlineStroke());
        g2.setPaint(plot.getAngleGridlinePaint());

        double axisMin = plot.getAxis().getLowerBound();
        double maxRadius = plot.getMaxRadius();

        Point center = plot.translateValueThetaRadiusToJava2D(axisMin, axisMin,
                dataArea);
        Iterator iterator = ticks.iterator();
        while (iterator.hasNext()) {
            NumberTick tick = (NumberTick) iterator.next();
            Point p = plot.translateValueThetaRadiusToJava2D(
                    tick.getNumber().doubleValue(), maxRadius, dataArea);
            g2.setPaint(plot.getAngleGridlinePaint());
            g2.drawLine(center.x, center.y, p.x, p.y);
            if (plot.isAngleLabelsVisible()) {
                int x = p.x;
                int y = p.y;
                g2.setPaint(plot.getAngleLabelPaint());
                TextUtilities.drawAlignedString(tick.getText(), g2, x, y,
                        TextAnchor.CENTER);
            }
        }
     }

    /**
     * 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) {

        g2.setFont(radialAxis.getTickLabelFont());
        g2.setPaint(plot.getRadiusGridlinePaint());
        g2.setStroke(plot.getRadiusGridlineStroke());

        double axisMin = radialAxis.getLowerBound();
        Point center = plot.translateValueThetaRadiusToJava2D(axisMin, axisMin,
                dataArea);

        Iterator iterator = ticks.iterator();
        while (iterator.hasNext()) {
            NumberTick tick = (NumberTick) iterator.next();
            Point p = plot.translateValueThetaRadiusToJava2D(90.0,
                    tick.getNumber().doubleValue(), dataArea);
            int r = p.x - center.x;
            int upperLeftX = center.x - r;
            int upperLeftY = center.y - r;
            int d = 2 * r;
            Ellipse2D ring = new Ellipse2D.Double(upperLeftX, upperLeftY, d, d);
            g2.setPaint(plot.getRadiusGridlinePaint());
            g2.draw(ring);
        }
    }

    /**
     * Return the legend for the given series.
     *
     * @param series  the series index.
     *
     * @return The legend item.
     */
    public LegendItem getLegendItem(int series) {
        LegendItem result = null;
        PolarPlot polarPlot = getPlot();
        if (polarPlot != null) {
            XYDataset dataset = polarPlot.getDataset();
            if (dataset != null) {
                String label = dataset.getSeriesKey(series).toString();
                String description = label;
                Shape shape = lookupSeriesShape(series);
                Paint paint = lookupSeriesPaint(series);
                Paint outlinePaint = lookupSeriesOutlinePaint(series);
                Stroke outlineStroke = lookupSeriesOutlineStroke(series);
                result = new LegendItem(label, description, null, null,
                        shape, paint, outlineStroke, outlinePaint);
                result.setDataset(dataset);
            }
        }
        return result;
    }

    /**
     * Tests this renderer for equality with an arbitrary object.
     *
     * @param obj  the object (<code>null not permitted).
     *
     * @return <code>true if this renderer is equal to obj,
     *     and <code>false otherwise.
     */
    public boolean equals(Object obj) {
        if (obj == null) {
            return false;
        }
        if (!(obj instanceof DefaultPolarItemRenderer)) {
            return false;
        }
        DefaultPolarItemRenderer that = (DefaultPolarItemRenderer) obj;
        if (!this.seriesFilled.equals(that.seriesFilled)) {
            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 {
        DefaultPolarItemRenderer clone
                = (DefaultPolarItemRenderer) super.clone();
        clone.seriesFilled = (BooleanList) this.seriesFilled.clone();
        return clone;
    }

}

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