jfreechart example source code file (WindItemRenderer.java)

This example jfreechart source code file (WindItemRenderer.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

abstractxyitemrenderer, awt, clonenotsupportedexception, geometry, io, number, number, rectangleedge, rectangleedge, serializable, valueaxis, winddataset, winddataset, winditemrenderer, winditemrenderer, xydataset, xyitemrendererstate

The jfreechart WindItemRenderer.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.]
 *
 * ---------------------
 * WindItemRenderer.java
 * ---------------------
 * (C) Copyright 2001-2008, by Achilleus Mantzios and Contributors.
 *
 * Original Author:  Achilleus Mantzios;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * Changes
 * -------
 * 06-Feb-2002 : Version 1, based on code contributed by Achilleus
 *               Mantzios (DG);
 * 28-Mar-2002 : Added a property change listener mechanism so that renderers
 *               no longer need to be immutable.  Changed StrictMath --> Math
 *               to retain JDK1.2 compatibility (DG);
 * 09-Apr-2002 : Changed return type of the drawItem method to void, reflecting
 *               the change in the XYItemRenderer method (DG);
 * 01-Oct-2002 : Fixed errors reported by Checkstyle (DG);
 * 21-Jan-2003 : Added new constructor (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);
 * 15-Jul-2004 : Switched getX() with getXValue() and getY() with
 *               getYValue() (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 02-Feb-2007 : Removed author tags from all over JFreeChart sources (DG);
 *
 */

package org.jfree.chart.renderer.xy;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Stroke;
import java.awt.geom.Line2D;
import java.awt.geom.Rectangle2D;
import java.io.Serializable;

import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.plot.CrosshairState;
import org.jfree.chart.plot.PlotRenderingInfo;
import org.jfree.chart.plot.XYPlot;
import org.jfree.data.xy.WindDataset;
import org.jfree.data.xy.XYDataset;
import org.jfree.ui.RectangleEdge;
import org.jfree.util.PublicCloneable;

/**
 * A specialised renderer for displaying wind intensity/direction data.
 * The example shown here is generated by the <code>WindChartDemo1.java
 * program included in the JFreeChart demo collection:
 * <br>

 * <img src="../../../../../images/WindItemRendererSample.png"
 * alt="WindItemRendererSample.png" />
 */
public class WindItemRenderer extends AbstractXYItemRenderer
        implements XYItemRenderer, Cloneable, PublicCloneable, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = 8078914101916976844L;

    /**
     * Creates a new renderer.
     */
    public WindItemRenderer() {
        super();
    }

    /**
     * Draws the visual representation of a single data item.
     *
     * @param g2  the graphics device.
     * @param state  the renderer state.
     * @param plotArea  the area within which the plot is being drawn.
     * @param info  optional information collection.
     * @param plot  the plot (can be used to obtain standard color
     *              information etc).
     * @param domainAxis  the horizontal axis.
     * @param rangeAxis  the vertical 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.
     */
    public void drawItem(Graphics2D g2,
                         XYItemRendererState state,
                         Rectangle2D plotArea,
                         PlotRenderingInfo info,
                         XYPlot plot,
                         ValueAxis domainAxis,
                         ValueAxis rangeAxis,
                         XYDataset dataset,
                         int series,
                         int item,
                         CrosshairState crosshairState,
                         int pass) {

        WindDataset windData = (WindDataset) dataset;

        Paint seriesPaint = getItemPaint(series, item);
        Stroke seriesStroke = getItemStroke(series, item);
        g2.setPaint(seriesPaint);
        g2.setStroke(seriesStroke);

        // get the data point...

        Number x = windData.getX(series, item);
        Number windDir = windData.getWindDirection(series, item);
        Number wforce = windData.getWindForce(series, item);
        double windForce = wforce.doubleValue();

        double wdirt = Math.toRadians(windDir.doubleValue() * (-30.0) - 90.0);

        double ax1, ax2, ay1, ay2, rax2, ray2;

        RectangleEdge domainAxisLocation = plot.getDomainAxisEdge();
        RectangleEdge rangeAxisLocation = plot.getRangeAxisEdge();
        ax1 = domainAxis.valueToJava2D(x.doubleValue(), plotArea,
                domainAxisLocation);
        ay1 = rangeAxis.valueToJava2D(0.0, plotArea, rangeAxisLocation);

        rax2 = x.doubleValue() + (windForce * Math.cos(wdirt) * 8000000.0);
        ray2 = windForce * Math.sin(wdirt);

        ax2 = domainAxis.valueToJava2D(rax2, plotArea, domainAxisLocation);
        ay2 = rangeAxis.valueToJava2D(ray2, plotArea, rangeAxisLocation);

        int diri = windDir.intValue();
        int forcei = wforce.intValue();
        String dirforce = diri + "-" + forcei;
        Line2D line = new Line2D.Double(ax1, ay1, ax2, ay2);

        g2.draw(line);
        g2.setPaint(Color.blue);
        g2.setFont(new Font("Dialog", 1, 9));

        g2.drawString(dirforce, (float) ax1, (float) ay1);

        g2.setPaint(seriesPaint);
        g2.setStroke(seriesStroke);

        double alx2, aly2, arx2, ary2;
        double ralx2, raly2, rarx2, rary2;

        double aldir = Math.toRadians(windDir.doubleValue()
                * (-30.0) - 90.0 - 5.0);
        ralx2 = wforce.doubleValue() * Math.cos(aldir) * 8000000 * 0.8
        + x.doubleValue();
        raly2 = wforce.doubleValue() * Math.sin(aldir) * 0.8;

        alx2 = domainAxis.valueToJava2D(ralx2, plotArea, domainAxisLocation);
        aly2 = rangeAxis.valueToJava2D(raly2, plotArea, rangeAxisLocation);

        line = new Line2D.Double(alx2, aly2, ax2, ay2);
        g2.draw(line);

        double ardir = Math.toRadians(windDir.doubleValue()
                * (-30.0) - 90.0 + 5.0);
        rarx2 = wforce.doubleValue() * Math.cos(ardir) * 8000000 * 0.8
                + x.doubleValue();
        rary2 = wforce.doubleValue() * Math.sin(ardir) * 0.8;

        arx2 = domainAxis.valueToJava2D(rarx2, plotArea, domainAxisLocation);
        ary2 = rangeAxis.valueToJava2D(rary2, plotArea, rangeAxisLocation);

        line = new Line2D.Double(arx2, ary2, ax2, ay2);
        g2.draw(line);

    }

    /**
     * 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();
    }

}