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jfreechart example source code file (XYShapeAnnotation.java)

This example jfreechart source code file (XYShapeAnnotation.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

affinetransform, affinetransform, awt, clonenotsupportedexception, geometry, io, ioexception, paint, paint, rectangle2d, rectangleedge, shape, stroke, stroke, valueaxis, xyshapeannotation, xyshapeannotation

The jfreechart XYShapeAnnotation.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.]
 *
 * ----------------------
 * XYShapeAnnotation.java
 * ----------------------
 * (C) Copyright 2003-2008, by Ondax, Inc. and Contributors.
 *
 * Original Author:  Greg Steckman (for Ondax, Inc.);
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * Changes:
 * --------
 * 15-Aug-2003 : Version 1, adapted from
 *               org.jfree.chart.annotations.XYLineAnnotation (GS);
 * 21-Jan-2004 : Update for renamed method in ValueAxis (DG);
 * 20-Apr-2004 : Added new constructor and fixed bug 934258 (DG);
 * 29-Sep-2004 : Added 'fillPaint' to allow for colored shapes, now extends
 *               AbstractXYAnnotation to add tool tip and URL support, and
 *               implemented equals() and Cloneable (DG);
 * 21-Jan-2005 : Modified constructor for consistency with other
 *               constructors (DG);
 * 06-Jun-2005 : Fixed equals() method to handle GradientPaint (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 24-Oct-2006 : Calculate AffineTransform on shape's bounding rectangle
 *               rather than sample points (0, 0) and (1, 1) (DG);
 * 06-Mar-2007 : Implemented hashCode() (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.Shape;
import java.awt.Stroke;
import java.awt.geom.AffineTransform;
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.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 simple <code>Shape annotation that can be placed on an
 * {@link XYPlot}.  The shape coordinates are specified in data space.
 */
public class XYShapeAnnotation extends AbstractXYAnnotation
        implements Cloneable, PublicCloneable, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -8553218317600684041L;

    /** The shape. */
    private transient Shape shape;

    /** The stroke used to draw the shape's outline. */
    private transient Stroke stroke;

    /** The paint used to draw the shape's outline. */
    private transient Paint outlinePaint;

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

    /**
     * Creates a new annotation (where, by default, the shape is drawn
     * with a black outline).
     *
     * @param shape  the shape (coordinates in data space, <code>null
     *     not permitted).
     */
    public XYShapeAnnotation(Shape shape) {
        this(shape, new BasicStroke(1.0f), Color.black);
    }

    /**
     * Creates a new annotation where the shape is drawn as an outline using
     * the specified <code>stroke and outlinePaint.
     *
     * @param shape  the shape (<code>null not permitted).
     * @param stroke  the shape stroke (<code>null permitted).
     * @param outlinePaint  the shape color (<code>null permitted).
     */
    public XYShapeAnnotation(Shape shape, Stroke stroke, Paint outlinePaint) {
        this(shape, stroke, outlinePaint, null);
    }

    /**
     * Creates a new annotation.
     *
     * @param shape  the shape (<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 XYShapeAnnotation(Shape shape, Stroke stroke, Paint outlinePaint,
                             Paint fillPaint) {
        if (shape == null) {
            throw new IllegalArgumentException("Null 'shape' argument.");
        }
        this.shape = shape;
        this.stroke = stroke;
        this.outlinePaint = outlinePaint;
        this.fillPaint = fillPaint;
    }

    /**
     * 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) {

        PlotOrientation orientation = plot.getOrientation();
        RectangleEdge domainEdge = Plot.resolveDomainAxisLocation(
                plot.getDomainAxisLocation(), orientation);
        RectangleEdge rangeEdge = Plot.resolveRangeAxisLocation(
                plot.getRangeAxisLocation(), orientation);

        // compute transform matrix elements via sample points. Assume no
        // rotation or shear.
        Rectangle2D bounds = this.shape.getBounds2D();
        double x0 = bounds.getMinX();
        double x1 = bounds.getMaxX();
        double xx0 = domainAxis.valueToJava2D(x0, dataArea, domainEdge);
        double xx1 = domainAxis.valueToJava2D(x1, dataArea, domainEdge);
        double m00 = (xx1 - xx0) / (x1 - x0);
        double m02 = xx0 - x0 * m00;

        double y0 = bounds.getMaxY();
        double y1 = bounds.getMinY();
        double yy0 = rangeAxis.valueToJava2D(y0, dataArea, rangeEdge);
        double yy1 = rangeAxis.valueToJava2D(y1, dataArea, rangeEdge);
        double m11 = (yy1 - yy0) / (y1 - y0);
        double m12 = yy0 - m11 * y0;

        //  create transform & transform shape
        Shape s = null;
        if (orientation == PlotOrientation.HORIZONTAL) {
            AffineTransform t1 = new AffineTransform(0.0f, 1.0f, 1.0f, 0.0f,
                    0.0f, 0.0f);
            AffineTransform t2 = new AffineTransform(m11, 0.0f, 0.0f, m00,
                    m12, m02);
            s = t1.createTransformedShape(this.shape);
            s = t2.createTransformedShape(s);
        }
        else if (orientation == PlotOrientation.VERTICAL) {
            AffineTransform t = new AffineTransform(m00, 0, 0, m11, m02, m12);
            s = t.createTransformedShape(this.shape);
        }

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

        if (this.stroke != null && this.outlinePaint != null) {
            g2.setPaint(this.outlinePaint);
            g2.setStroke(this.stroke);
            g2.draw(s);
        }
        addEntity(info, s, 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 XYShapeAnnotation)) {
            return false;
        }
        XYShapeAnnotation that = (XYShapeAnnotation) obj;
        if (!this.shape.equals(that.shape)) {
            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 + this.shape.hashCode();
        if (this.stroke != null) {
            result = 37 * result + this.stroke.hashCode();
        }
        result = 37 * result + HashUtilities.hashCodeForPaint(
                this.outlinePaint);
        result = 37 * result + HashUtilities.hashCodeForPaint(this.fillPaint);
        return result;
    }

    /**
     * Returns a clone.
     *
     * @return A clone.
     *
     * @throws CloneNotSupportedException ???.
     */
    public Object clone() throws CloneNotSupportedException {
        return super.clone();
    }

    /**
     * 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.writeShape(this.shape, stream);
        SerialUtilities.writeStroke(this.stroke, stream);
        SerialUtilities.writePaint(this.outlinePaint, stream);
        SerialUtilities.writePaint(this.fillPaint, 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.shape = SerialUtilities.readShape(stream);
        this.stroke = SerialUtilities.readStroke(stream);
        this.outlinePaint = SerialUtilities.readPaint(stream);
        this.fillPaint = SerialUtilities.readPaint(stream);
    }

}

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