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jfreechart example source code file (LabelBlock.java)

This example jfreechart source code file (LabelBlock.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, default_paint, entityblockparams, font, font, geometry, illegalargumentexception, io, labelblock, labelblock, null, object, paint, paint, string, string, textblockanchor

The jfreechart LabelBlock.java source code

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2009, 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.]
 *
 * ---------------
 * LabelBlock.java
 * ---------------
 * (C) Copyright 2004-2009, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   Pierre-Marie Le Biot;
 *
 * Changes:
 * --------
 * 22-Oct-2004 : Version 1 (DG);
 * 19-Apr-2005 : Added optional tooltip and URL text items,
 *               draw() method now returns entities if
 *               requested (DG);
 * 13-May-2005 : Added methods to set the font (DG);
 * 01-Sep-2005 : Added paint management (PMLB);
 *               Implemented equals() and clone() (PublicCloneable) (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 20-Jul-2006 : Fixed entity area in draw() method (DG);
 * 16-Mar-2007 : Fixed serialization when using GradientPaint (DG);
 * 10-Feb-2009 : Added alignment fields (DG);
 *
 */

package org.jfree.chart.block;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Shape;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

import org.jfree.chart.entity.ChartEntity;
import org.jfree.chart.entity.StandardEntityCollection;
import org.jfree.io.SerialUtilities;
import org.jfree.text.TextBlock;
import org.jfree.text.TextBlockAnchor;
import org.jfree.text.TextUtilities;
import org.jfree.ui.RectangleAnchor;
import org.jfree.ui.Size2D;
import org.jfree.util.ObjectUtilities;
import org.jfree.util.PaintUtilities;
import org.jfree.util.PublicCloneable;

/**
 * A block containing a label.
 */
public class LabelBlock extends AbstractBlock
        implements Block, PublicCloneable {

    /** For serialization. */
    static final long serialVersionUID = 249626098864178017L;

    /**
     * The text for the label - retained in case the label needs
     * regenerating (for example, to change the font).
     */
    private String text;

    /** The label. */
    private TextBlock label;

    /** The font. */
    private Font font;

    /** The tool tip text (can be <code>null). */
    private String toolTipText;

    /** The URL text (can be <code>null). */
    private String urlText;

    /** The default color. */
    public static final Paint DEFAULT_PAINT = Color.black;

    /** The paint. */
    private transient Paint paint;

    /**
     * The content alignment point.
     *
     * @since 1.0.13
     */
    private TextBlockAnchor contentAlignmentPoint;

    /**
     * The anchor point for the text.
     *
     * @since 1.0.13
     */
    private RectangleAnchor textAnchor;

    /**
     * Creates a new label block.
     *
     * @param label  the label (<code>null not permitted).
     */
    public LabelBlock(String label) {
        this(label, new Font("SansSerif", Font.PLAIN, 10), DEFAULT_PAINT);
    }

    /**
     * Creates a new label block.
     *
     * @param text  the text for the label (<code>null not permitted).
     * @param font  the font (<code>null not permitted).
     */
    public LabelBlock(String text, Font font) {
        this(text, font, DEFAULT_PAINT);
    }

    /**
     * Creates a new label block.
     *
     * @param text  the text for the label (<code>null not permitted).
     * @param font  the font (<code>null not permitted).
     * @param paint the paint (<code>null not permitted).
     */
    public LabelBlock(String text, Font font, Paint paint) {
        this.text = text;
        this.paint = paint;
        this.label = TextUtilities.createTextBlock(text, font, this.paint);
        this.font = font;
        this.toolTipText = null;
        this.urlText = null;
        this.contentAlignmentPoint = TextBlockAnchor.CENTER;
        this.textAnchor = RectangleAnchor.CENTER;
    }

    /**
     * Returns the font.
     *
     * @return The font (never <code>null).
     *
     * @see #setFont(Font)
     */
    public Font getFont() {
        return this.font;
    }

    /**
     * Sets the font and regenerates the label.
     *
     * @param font  the font (<code>null not permitted).
     *
     * @see #getFont()
     */
    public void setFont(Font font) {
        if (font == null) {
            throw new IllegalArgumentException("Null 'font' argument.");
        }
        this.font = font;
        this.label = TextUtilities.createTextBlock(this.text, font, this.paint);
    }

    /**
     * Returns the paint.
     *
     * @return The paint (never <code>null).
     *
     * @see #setPaint(Paint)
     */
    public Paint getPaint() {
        return this.paint;
    }

    /**
     * Sets the paint and regenerates the label.
     *
     * @param paint  the paint (<code>null not permitted).
     *
     * @see #getPaint()
     */
    public void setPaint(Paint paint) {
        if (paint == null) {
            throw new IllegalArgumentException("Null 'paint' argument.");
        }
        this.paint = paint;
        this.label = TextUtilities.createTextBlock(this.text, this.font,
                this.paint);
    }

    /**
     * Returns the tool tip text.
     *
     * @return The tool tip text (possibly <code>null).
     *
     * @see #setToolTipText(String)
     */
    public String getToolTipText() {
        return this.toolTipText;
    }

    /**
     * Sets the tool tip text.
     *
     * @param text  the text (<code>null permitted).
     *
     * @see #getToolTipText()
     */
    public void setToolTipText(String text) {
        this.toolTipText = text;
    }

    /**
     * Returns the URL text.
     *
     * @return The URL text (possibly <code>null).
     *
     * @see #setURLText(String)
     */
    public String getURLText() {
        return this.urlText;
    }

    /**
     * Sets the URL text.
     *
     * @param text  the text (<code>null permitted).
     *
     * @see #getURLText()
     */
    public void setURLText(String text) {
        this.urlText = text;
    }

    /**
     * Returns the content alignment point.
     *
     * @return The content alignment point (never <code>null).
     *
     * @since 1.0.13
     */
    public TextBlockAnchor getContentAlignmentPoint() {
        return this.contentAlignmentPoint;
    }

    /**
     * Sets the content alignment point.
     *
     * @param anchor  the anchor used to determine the alignment point (never
     *         <code>null).
     *
     * @since 1.0.13
     */
    public void setContentAlignmentPoint(TextBlockAnchor anchor) {
        if (anchor == null) {
            throw new IllegalArgumentException("Null 'anchor' argument.");
        }
        this.contentAlignmentPoint = anchor;
    }

    /**
     * Returns the text anchor (never <code>null).
     *
     * @return The text anchor.
     *
     * @since 1.0.13
     */
    public RectangleAnchor getTextAnchor() {
        return this.textAnchor;
    }

    /**
     * Sets the text anchor.
     *
     * @param anchor  the anchor (<code>null not permitted).
     *
     * @since 1.0.13
     */
    public void setTextAnchor(RectangleAnchor anchor) {
        this.textAnchor = anchor;
    }

    /**
     * Arranges the contents of the block, within the given constraints, and
     * returns the block size.
     *
     * @param g2  the graphics device.
     * @param constraint  the constraint (<code>null not permitted).
     *
     * @return The block size (in Java2D units, never <code>null).
     */
    public Size2D arrange(Graphics2D g2, RectangleConstraint constraint) {
        g2.setFont(this.font);
        Size2D s = this.label.calculateDimensions(g2);
        return new Size2D(calculateTotalWidth(s.getWidth()),
                calculateTotalHeight(s.getHeight()));
    }

    /**
     * Draws the block.
     *
     * @param g2  the graphics device.
     * @param area  the area.
     */
    public void draw(Graphics2D g2, Rectangle2D area) {
        draw(g2, area, null);
    }

    /**
     * Draws the block within the specified area.
     *
     * @param g2  the graphics device.
     * @param area  the area.
     * @param params  ignored (<code>null permitted).
     *
     * @return Always <code>null.
     */
    public Object draw(Graphics2D g2, Rectangle2D area, Object params) {
        area = trimMargin(area);
        drawBorder(g2, area);
        area = trimBorder(area);
        area = trimPadding(area);

        // check if we need to collect chart entities from the container
        EntityBlockParams ebp = null;
        StandardEntityCollection sec = null;
        Shape entityArea = null;
        if (params instanceof EntityBlockParams) {
            ebp = (EntityBlockParams) params;
            if (ebp.getGenerateEntities()) {
                sec = new StandardEntityCollection();
                entityArea = (Shape) area.clone();
            }
        }
        g2.setPaint(this.paint);
        g2.setFont(this.font);
        Point2D pt = RectangleAnchor.coordinates(area, this.textAnchor);
        this.label.draw(g2, (float) pt.getX(), (float) pt.getY(),
                this.contentAlignmentPoint);
        BlockResult result = null;
        if (ebp != null && sec != null) {
            if (this.toolTipText != null || this.urlText != null) {
                ChartEntity entity = new ChartEntity(entityArea,
                        this.toolTipText, this.urlText);
                sec.add(entity);
                result = new BlockResult();
                result.setEntityCollection(sec);
            }
        }
        return result;
    }

    /**
     * Tests this <code>LabelBlock for equality with an arbitrary
     * object.
     *
     * @param obj  the object (<code>null permitted).
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (!(obj instanceof LabelBlock)) {
            return false;
        }
        LabelBlock that = (LabelBlock) obj;
        if (!this.text.equals(that.text)) {
            return false;
        }
        if (!this.font.equals(that.font)) {
            return false;
        }
        if (!PaintUtilities.equal(this.paint, that.paint)) {
            return false;
        }
        if (!ObjectUtilities.equal(this.toolTipText, that.toolTipText)) {
            return false;
        }
        if (!ObjectUtilities.equal(this.urlText, that.urlText)) {
            return false;
        }
        if (!this.contentAlignmentPoint.equals(that.contentAlignmentPoint)) {
            return false;
        }
        if (!this.textAnchor.equals(that.textAnchor)) {
            return false;
        }
        return super.equals(obj);
    }

    /**
     * Returns a clone of this <code>LabelBlock instance.
     *
     * @return A clone.
     *
     * @throws CloneNotSupportedException if there is a problem cloning.
     */
    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.writePaint(this.paint, 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.paint = SerialUtilities.readPaint(stream);
    }

}

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