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jfreechart example source code file (XYTitleAnnotation.java)

This example jfreechart source code file (XYTitleAnnotation.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, entityblockresult, geometry, io, object, range, range, rectangle2d, rectangleanchor, rectangleanchor, rectangleconstraint, string, title, title, valueaxis, xytitleannotation, xytitleannotation

The jfreechart XYTitleAnnotation.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.]
 *
 * ----------------------
 * XYTitleAnnotation.java
 * ----------------------
 * (C) Copyright 2007, 2008, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   Andrew Mickish;
 *
 * Changes:
 * --------
 * 02-Feb-2007 : Version 1 (DG);
 * 30-Apr-2007 : Fixed equals() method (DG);
 * 26-Feb-2008 : Fixed NullPointerException when drawing chart with a null
 *               ChartRenderingInfo - see patch 1901599 by Andrew Mickish (DG);
 * 03-Sep-2008 : Moved from experimental to main (DG);
 *
 */

package org.jfree.chart.annotations;

import java.awt.Graphics2D;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.io.Serializable;

import org.jfree.chart.HashUtilities;
import org.jfree.chart.axis.AxisLocation;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.block.BlockParams;
import org.jfree.chart.block.EntityBlockResult;
import org.jfree.chart.block.RectangleConstraint;
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.chart.title.Title;
import org.jfree.chart.util.XYCoordinateType;
import org.jfree.data.Range;
import org.jfree.ui.RectangleAnchor;
import org.jfree.ui.RectangleEdge;
import org.jfree.ui.Size2D;
import org.jfree.util.ObjectUtilities;
import org.jfree.util.PublicCloneable;

/**
 * An annotation that allows any {@link Title} to be placed at a location on
 * an {@link XYPlot}.
 *
 * @since 1.0.11
 */
public class XYTitleAnnotation extends AbstractXYAnnotation
        implements Cloneable, PublicCloneable, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -4364694501921559958L;

    /** The coordinate type. */
    private XYCoordinateType coordinateType;

    /** The x-coordinate (in data space). */
    private double x;

    /** The y-coordinate (in data space). */
    private double y;

    /** The maximum width. */
    private double maxWidth;

    /** The maximum height. */
    private double maxHeight;

    /** The title. */
    private Title title;

    /**
     * The title anchor point.
     */
    private RectangleAnchor anchor;

    /**
     * Creates a new annotation to be displayed at the specified (x, y)
     * location.
     *
     * @param x  the x-coordinate (in data space).
     * @param y  the y-coordinate (in data space).
     * @param title  the title (<code>null not permitted).
     */
    public XYTitleAnnotation(double x, double y, Title title) {
        this(x, y, title, RectangleAnchor.CENTER);
    }

    /**
     * Creates a new annotation to be displayed at the specified (x, y)
     * location.
     *
     * @param x  the x-coordinate (in data space).
     * @param y  the y-coordinate (in data space).
     * @param title  the title (<code>null not permitted).
     * @param anchor  the title anchor (<code>null not permitted).
     */
    public XYTitleAnnotation(double x, double y, Title title,
            RectangleAnchor anchor) {
        if (title == null) {
            throw new IllegalArgumentException("Null 'title' argument.");
        }
        if (anchor == null) {
            throw new IllegalArgumentException("Null 'anchor' argument.");
        }
        this.coordinateType = XYCoordinateType.RELATIVE;
        this.x = x;
        this.y = y;
        this.maxWidth = 0.0;
        this.maxHeight = 0.0;
        this.title = title;
        this.anchor = anchor;
    }

    /**
     * Returns the coordinate type (set in the constructor).
     *
     * @return The coordinate type (never <code>null).
     */
    public XYCoordinateType getCoordinateType() {
        return this.coordinateType;
    }

    /**
     * Returns the x-coordinate for the annotation.
     *
     * @return The x-coordinate.
     */
    public double getX() {
        return this.x;
    }

    /**
     * Returns the y-coordinate for the annotation.
     *
     * @return The y-coordinate.
     */
    public double getY() {
        return this.y;
    }

    /**
     * Returns the title for the annotation.
     *
     * @return The title.
     */
    public Title getTitle() {
        return this.title;
    }

    /**
     * Returns the title anchor for the annotation.
     *
     * @return The title anchor.
     */
    public RectangleAnchor getTitleAnchor() {
        return this.anchor;
    }

    /**
     * Returns the maximum width.
     *
     * @return The maximum width.
     */
    public double getMaxWidth() {
        return this.maxWidth;
    }

    /**
     * Sets the maximum width.
     *
     * @param max  the maximum width (0.0 or less means no maximum).
     */
    public void setMaxWidth(double max) {
        this.maxWidth = max;
    }

    /**
     * Returns the maximum height.
     *
     * @return The maximum height.
     */
    public double getMaxHeight() {
        return this.maxHeight;
    }

    /**
     * Sets the maximum height.
     *
     * @param max  the maximum height.
     */
    public void setMaxHeight(double max) {
        this.maxHeight = max;
    }

    /**
     * Draws the annotation.  This method is called by the drawing code in the
     * {@link XYPlot} class, you don't normally need to call this method
     * 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  if supplied, this info object will be populated with
     *              entity information.
     */
    public void draw(Graphics2D g2, XYPlot plot, Rectangle2D dataArea,
                     ValueAxis domainAxis, ValueAxis rangeAxis,
                     int rendererIndex,
                     PlotRenderingInfo info) {

        PlotOrientation orientation = plot.getOrientation();
        AxisLocation domainAxisLocation = plot.getDomainAxisLocation();
        AxisLocation rangeAxisLocation = plot.getRangeAxisLocation();
        RectangleEdge domainEdge = Plot.resolveDomainAxisLocation(
                domainAxisLocation, orientation);
        RectangleEdge rangeEdge = Plot.resolveRangeAxisLocation(
                rangeAxisLocation, orientation);
        Range xRange = domainAxis.getRange();
        Range yRange = rangeAxis.getRange();
        double anchorX = 0.0;
        double anchorY = 0.0;
        if (this.coordinateType == XYCoordinateType.RELATIVE) {
            anchorX = xRange.getLowerBound() + (this.x * xRange.getLength());
            anchorY = yRange.getLowerBound() + (this.y * yRange.getLength());
        }
        else {
            anchorX = domainAxis.valueToJava2D(this.x, dataArea, domainEdge);
            anchorY = rangeAxis.valueToJava2D(this.y, dataArea, rangeEdge);
        }

        float j2DX = (float) domainAxis.valueToJava2D(anchorX, dataArea,
                domainEdge);
        float j2DY = (float) rangeAxis.valueToJava2D(anchorY, dataArea,
                rangeEdge);
        float xx = 0.0f;
        float yy = 0.0f;
        if (orientation == PlotOrientation.HORIZONTAL) {
            xx = j2DY;
            yy = j2DX;
        }
        else if (orientation == PlotOrientation.VERTICAL) {
            xx = j2DX;
            yy = j2DY;
        }

        double maxW = dataArea.getWidth();
        double maxH = dataArea.getHeight();
        if (this.coordinateType == XYCoordinateType.RELATIVE) {
            if (this.maxWidth > 0.0) {
                maxW = maxW * this.maxWidth;
            }
            if (this.maxHeight > 0.0) {
                maxH = maxH * this.maxHeight;
            }
        }
        if (this.coordinateType == XYCoordinateType.DATA) {
            maxW = this.maxWidth;
            maxH = this.maxHeight;
        }
        RectangleConstraint rc = new RectangleConstraint(
                new Range(0, maxW), new Range(0, maxH));

        Size2D size = this.title.arrange(g2, rc);
        Rectangle2D titleRect = new Rectangle2D.Double(0, 0, size.width,
                size.height);
        Point2D anchorPoint = RectangleAnchor.coordinates(titleRect,
                this.anchor);
        xx = xx - (float) anchorPoint.getX();
        yy = yy - (float) anchorPoint.getY();
        titleRect.setRect(xx, yy, titleRect.getWidth(), titleRect.getHeight());
        BlockParams p = new BlockParams();
        if (info != null) {
            if (info.getOwner().getEntityCollection() != null) {
                p.setGenerateEntities(true);
            }
        }
        Object result = this.title.draw(g2, titleRect, p);
        if (info != null) {
            if (result instanceof EntityBlockResult) {
                EntityBlockResult ebr = (EntityBlockResult) result;
                info.getOwner().getEntityCollection().addAll(
                        ebr.getEntityCollection());
            }
            String toolTip = getToolTipText();
            String url = getURL();
            if (toolTip != null || url != null) {
                addEntity(info, new Rectangle2D.Float(xx, yy,
                        (float) size.width, (float) size.height),
                        rendererIndex, toolTip, url);
            }
        }
    }

    /**
     * Tests this object 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;
        }
        if (!(obj instanceof XYTitleAnnotation)) {
            return false;
        }
        XYTitleAnnotation that = (XYTitleAnnotation) obj;
        if (this.coordinateType != that.coordinateType) {
            return false;
        }
        if (this.x != that.x) {
            return false;
        }
        if (this.y != that.y) {
            return false;
        }
        if (this.maxWidth != that.maxWidth) {
            return false;
        }
        if (this.maxHeight != that.maxHeight) {
            return false;
        }
        if (!ObjectUtilities.equal(this.title, that.title)) {
            return false;
        }
        if (!this.anchor.equals(that.anchor)) {
            return false;
        }
        return super.equals(obj);
    }

    /**
     * Returns a hash code for this object.
     *
     * @return A hash code.
     */
    public int hashCode() {
        int result = 193;
        result = HashUtilities.hashCode(result, this.anchor);
        result = HashUtilities.hashCode(result, this.coordinateType);
        result = HashUtilities.hashCode(result, this.x);
        result = HashUtilities.hashCode(result, this.y);
        result = HashUtilities.hashCode(result, this.maxWidth);
        result = HashUtilities.hashCode(result, this.maxHeight);
        result = HashUtilities.hashCode(result, this.title);
        return result;
    }

    /**
     * Returns a clone of the annotation.
     *
     * @return A clone.
     *
     * @throws CloneNotSupportedException  if the annotation can't be cloned.
     */
    public Object clone() throws CloneNotSupportedException {
        return super.clone();
    }

}

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