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jfreechart example source code file (XYPolygonAnnotation.java)

This example jfreechart source code file (XYPolygonAnnotation.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, clonenotsupportedexception, generalpath, geometry, illegalargumentexception, io, ioexception, ioexception, paint, paint, rectangleedge, serializable, stroke, stroke, util, valueaxis, xypolygonannotation, xypolygonannotation

The jfreechart XYPolygonAnnotation.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.]
 *
 * ------------------------
 * XYPolygonAnnotation.java
 * ------------------------
 * (C) Copyright 2005-2008, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes:
 * --------
 * 09-Feb-2005 : Version 1 (DG);
 *
 */

package org.jfree.chart.annotations;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Stroke;
import java.awt.geom.GeneralPath;
import java.awt.geom.Rectangle2D;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.Arrays;

import org.jfree.chart.HashUtilities;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.plot.Plot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.PlotRenderingInfo;
import org.jfree.chart.plot.XYPlot;
import org.jfree.io.SerialUtilities;
import org.jfree.ui.RectangleEdge;
import org.jfree.util.ObjectUtilities;
import org.jfree.util.PaintUtilities;
import org.jfree.util.PublicCloneable;

/**
 * A polygon annotation that can be placed on an {@link XYPlot}.  The
 * polygon coordinates are specified in data space.
 */
public class XYPolygonAnnotation extends AbstractXYAnnotation
        implements Cloneable, PublicCloneable, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -6984203651995900036L;

    /** The polygon. */
    private double[] polygon;

    /** The stroke used to draw the box outline. */
    private transient Stroke stroke;

    /** The paint used to draw the box outline. */
    private transient Paint outlinePaint;

    /** The paint used to fill the box. */
    private transient Paint fillPaint;

    /**
     * Creates a new annotation (where, by default, the polygon is drawn
     * with a black outline).  The array of polygon coordinates must contain
     * an even number of coordinates (each pair is an (x, y) location on the
     * plot) and the last point is automatically joined back to the first point.
     *
     * @param polygon  the coordinates of the polygon's vertices
     *     (<code>null not permitted).
     */
    public XYPolygonAnnotation(double[] polygon) {
        this(polygon, new BasicStroke(1.0f), Color.black);
    }

    /**
     * Creates a new annotation where the box is drawn as an outline using
     * the specified <code>stroke and outlinePaint.
     * The array of polygon coordinates must contain an even number of
     * coordinates (each pair is an (x, y) location on the plot) and the last
     * point is automatically joined back to the first point.
     *
     * @param polygon  the coordinates of the polygon's vertices
     *     (<code>null not permitted).
     * @param stroke  the shape stroke (<code>null permitted).
     * @param outlinePaint  the shape color (<code>null permitted).
     */
    public XYPolygonAnnotation(double[] polygon,
                               Stroke stroke, Paint outlinePaint) {
        this(polygon, stroke, outlinePaint, null);
    }

    /**
     * Creates a new annotation.  The array of polygon coordinates must
     * contain an even number of coordinates (each pair is an (x, y) location
     * on the plot) and the last point is automatically joined back to the
     * first point.
     *
     * @param polygon  the coordinates of the polygon's vertices
     *     (<code>null not permitted).
     * @param stroke  the shape stroke (<code>null permitted).
     * @param outlinePaint  the shape color (<code>null permitted).
     * @param fillPaint  the paint used to fill the shape (<code>null
     *                   permitted).
     */
    public XYPolygonAnnotation(double[] polygon,
                               Stroke stroke,
                               Paint outlinePaint, Paint fillPaint) {
        if (polygon == null) {
            throw new IllegalArgumentException("Null 'polygon' argument.");
        }
        if (polygon.length % 2 != 0) {
            throw new IllegalArgumentException("The 'polygon' array must "
                    + "contain an even number of items.");
        }
        this.polygon = (double[]) polygon.clone();
        this.stroke = stroke;
        this.outlinePaint = outlinePaint;
        this.fillPaint = fillPaint;
    }

    /**
     * Returns the coordinates of the polygon's vertices.  The returned array
     * is a copy, so it is safe to modify without altering the annotation's
     * state.
     *
     * @return The coordinates of the polygon's vertices.
     *
     * @since 1.0.2
     */
    public double[] getPolygonCoordinates() {
        return (double[]) this.polygon.clone();
    }

    /**
     * Returns the fill paint.
     *
     * @return The fill paint (possibly <code>null).
     *
     * @since 1.0.2
     */
    public Paint getFillPaint() {
        return this.fillPaint;
    }

    /**
     * Returns the outline stroke.
     *
     * @return The outline stroke (possibly <code>null).
     *
     * @since 1.0.2
     */
    public Stroke getOutlineStroke() {
        return this.stroke;
    }

    /**
     * Returns the outline paint.
     *
     * @return The outline paint (possibly <code>null).
     *
     * @since 1.0.2
     */
    public Paint getOutlinePaint() {
        return this.outlinePaint;
    }

    /**
     * Draws the annotation.  This method is usually called by the
     * {@link XYPlot} class, you shouldn't need to call it directly.
     *
     * @param g2  the graphics device.
     * @param plot  the plot.
     * @param dataArea  the data area.
     * @param domainAxis  the domain axis.
     * @param rangeAxis  the range axis.
     * @param rendererIndex  the renderer index.
     * @param info  the plot rendering info.
     */
    public void draw(Graphics2D g2, XYPlot plot, Rectangle2D dataArea,
                     ValueAxis domainAxis, ValueAxis rangeAxis,
                     int rendererIndex, PlotRenderingInfo info) {

        // if we don't have at least 2 (x, y) coordinates, just return
        if (this.polygon.length < 4) {
            return;
        }
        PlotOrientation orientation = plot.getOrientation();
        RectangleEdge domainEdge = Plot.resolveDomainAxisLocation(
                plot.getDomainAxisLocation(), orientation);
        RectangleEdge rangeEdge = Plot.resolveRangeAxisLocation(
                plot.getRangeAxisLocation(), orientation);

        GeneralPath area = new GeneralPath();
        double x = domainAxis.valueToJava2D(this.polygon[0], dataArea,
                domainEdge);
        double y = rangeAxis.valueToJava2D(this.polygon[1], dataArea,
                rangeEdge);
        if (orientation == PlotOrientation.HORIZONTAL) {
            area.moveTo((float) y, (float) x);
            for (int i = 2; i < this.polygon.length; i += 2) {
                x = domainAxis.valueToJava2D(this.polygon[i], dataArea,
                        domainEdge);
                y = rangeAxis.valueToJava2D(this.polygon[i + 1], dataArea,
                        rangeEdge);
                area.lineTo((float) y, (float) x);
            }
            area.closePath();
        }
        else if (orientation == PlotOrientation.VERTICAL) {
            area.moveTo((float) x, (float) y);
            for (int i = 2; i < this.polygon.length; i += 2) {
                x = domainAxis.valueToJava2D(this.polygon[i], dataArea,
                        domainEdge);
                y = rangeAxis.valueToJava2D(this.polygon[i + 1], dataArea,
                        rangeEdge);
                area.lineTo((float) x, (float) y);
            }
            area.closePath();
       }


        if (this.fillPaint != null) {
            g2.setPaint(this.fillPaint);
            g2.fill(area);
        }

        if (this.stroke != null && this.outlinePaint != null) {
            g2.setPaint(this.outlinePaint);
            g2.setStroke(this.stroke);
            g2.draw(area);
        }
        addEntity(info, area, rendererIndex, getToolTipText(), getURL());

    }

    /**
     * Tests this annotation for equality with an arbitrary object.
     *
     * @param obj  the object (<code>null permitted).
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        // now try to reject equality
        if (!super.equals(obj)) {
            return false;
        }
        if (!(obj instanceof XYPolygonAnnotation)) {
            return false;
        }
        XYPolygonAnnotation that = (XYPolygonAnnotation) obj;
        if (!Arrays.equals(this.polygon, that.polygon)) {
            return false;
        }
        if (!ObjectUtilities.equal(this.stroke, that.stroke)) {
            return false;
        }
        if (!PaintUtilities.equal(this.outlinePaint, that.outlinePaint)) {
            return false;
        }
        if (!PaintUtilities.equal(this.fillPaint, that.fillPaint)) {
            return false;
        }
        // seem to be the same
        return true;
    }

    /**
     * Returns a hash code for this instance.
     *
     * @return A hash code.
     */
    public int hashCode() {
        int result = 193;
        result = 37 * result + HashUtilities.hashCodeForDoubleArray(
                this.polygon);
        result = 37 * result + HashUtilities.hashCodeForPaint(this.fillPaint);
        result = 37 * result + HashUtilities.hashCodeForPaint(
                this.outlinePaint);
        if (this.stroke != null) {
            result = 37 * result + this.stroke.hashCode();
        }
        return result;
    }

    /**
     * Returns a clone.
     *
     * @return A clone.
     *
     * @throws CloneNotSupportedException not thrown by this class, but may be
     *                                    by subclasses.
     */
    public Object clone() throws CloneNotSupportedException {
        return super.clone();
    }

    /**
     * Provides serialization support.
     *
     * @param stream  the output stream (<code>null not permitted).
     *
     * @throws IOException if there is an I/O error.
     */
    private void writeObject(ObjectOutputStream stream) throws IOException {
        stream.defaultWriteObject();
        SerialUtilities.writeStroke(this.stroke, stream);
        SerialUtilities.writePaint(this.outlinePaint, stream);
        SerialUtilities.writePaint(this.fillPaint, stream);
    }

    /**
     * Provides serialization support.
     *
     * @param stream  the input stream (<code>null not permitted).
     *
     * @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.stroke = SerialUtilities.readStroke(stream);
        this.outlinePaint = SerialUtilities.readPaint(stream);
        this.fillPaint = SerialUtilities.readPaint(stream);
    }

}

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