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jfreechart example source code file (ColorBlock.java)

This example jfreechart source code file (ColorBlock.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

abstractblock, awt, classnotfoundexception, colorblock, colorblock, geometry, illegalargumentexception, io, ioexception, ioexception, object, object, paint, rectangle2d, rectangle2d, rectangleconstraint, size2d

The jfreechart ColorBlock.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.]
 *
 * ---------------
 * ColorBlock.java
 * ---------------
 * (C) Copyright 2004-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes:
 * --------
 * 22-Oct-2004 : Version 1 (DG);
 * 20-Apr-2005 : Added new draw() method (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 16-Mar-2007 : Implemented equals() and fixed serialization (DG);
 * 08-Apr-2008 : Added code for margin, border and padding in draw()
 *               method (DG);
 *
 */

package org.jfree.chart.block;

import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.geom.Rectangle2D;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

import org.jfree.io.SerialUtilities;
import org.jfree.ui.Size2D;
import org.jfree.util.PaintUtilities;

/**
 * A block that is filled with a single color.
 */
public class ColorBlock extends AbstractBlock implements Block {

    /** For serialization. */
    static final long serialVersionUID = 3383866145634010865L;

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

    /**
     * Creates a new block.
     *
     * @param paint  the paint (<code>null not permitted).
     * @param width  the width.
     * @param height  the height.
     */
    public ColorBlock(Paint paint, double width, double height) {
        if (paint == null) {
            throw new IllegalArgumentException("Null 'paint' argument.");
        }
        this.paint = paint;
        setWidth(width);
        setHeight(height);
    }

    /**
     * Returns the paint.
     *
     * @return The paint (never <code>null).
     *
     * @since 1.0.5
     */
    public Paint getPaint() {
        return this.paint;
    }

    /**
     * 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) {
        return new Size2D(calculateTotalWidth(getWidth()),
                calculateTotalHeight(getHeight()));
    }

    /**
     * Draws the block.
     *
     * @param g2  the graphics device.
     * @param area  the area.
     */
    public void draw(Graphics2D g2, Rectangle2D area) {
        area = trimMargin(area);
        drawBorder(g2, area);
        area = trimBorder(area);
        area = trimPadding(area);
        g2.setPaint(this.paint);
        g2.fill(area);
    }

    /**
     * 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) {
        draw(g2, area);
        return null;
    }

    /**
     * Tests this block 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 ColorBlock)) {
            return false;
        }
        ColorBlock that = (ColorBlock) obj;
        if (!PaintUtilities.equal(this.paint, that.paint)) {
            return false;
        }
        return super.equals(obj);
    }

    /**
     * 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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