Source for org.jfree.report.util.ImageUtils

   1: /**
   2:  * ========================================
   3:  * JFreeReport : a free Java report library
   4:  * ========================================
   5:  *
   6:  * Project Info:  http://reporting.pentaho.org/
   7:  *
   8:  * (C) Copyright 2000-2007, by Object Refinery Limited, Pentaho Corporation and Contributors.
   9:  *
  10:  * This library is free software; you can redistribute it and/or modify it under the terms
  11:  * of the GNU Lesser General Public License as published by the Free Software Foundation;
  12:  * either version 2.1 of the License, or (at your option) any later version.
  13:  *
  14:  * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
  15:  * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  16:  * See the GNU Lesser General Public License for more details.
  17:  *
  18:  * You should have received a copy of the GNU Lesser General Public License along with this
  19:  * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  20:  * Boston, MA 02111-1307, USA.
  21:  *
  22:  * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
  23:  * in the United States and other countries.]
  24:  *
  25:  * ------------
  26:  * $Id: ImageUtils.java 2725 2007-04-01 18:49:29Z taqua $
  27:  * ------------
  28:  * (C) Copyright 2000-2005, by Object Refinery Limited.
  29:  * (C) Copyright 2005-2007, by Pentaho Corporation.
  30:  */
  31: 
  32: package org.jfree.report.util;
  33: 
  34: import java.awt.image.BufferedImage;
  35: import java.util.Arrays;
  36: import javax.swing.Icon;
  37: import javax.swing.ImageIcon;
  38: 
  39: /**
  40:  * Provides utility methods for image creation and manipluation.
  41:  *
  42:  * @author Thomas Morgner
  43:  */
  44: public final class ImageUtils
  45: {
  46:   /**
  47:    * DefaultConstructor.
  48:    */
  49:   private ImageUtils ()
  50:   {
  51:   }
  52: 
  53:   /**
  54:    * Creates a transparent image.  These can be used for aligning menu items.
  55:    *
  56:    * @param width  the width.
  57:    * @param height the height.
  58:    * @return the created transparent image.
  59:    */
  60:   public static BufferedImage createTransparentImage (final int width, final int height)
  61:   {
  62:     final BufferedImage img = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
  63:     final int[] data = img.getRGB(0, 0, width, height, null, 0, width);
  64:     Arrays.fill(data, 0x00000000);
  65:     img.setRGB(0, 0, width, height, data, 0, width);
  66:     return img;
  67:   }
  68: 
  69:   /**
  70:    * Creates a transparent icon. The Icon can be used for aligning menu items.
  71:    *
  72:    * @param width  the width of the new icon
  73:    * @param height the height of the new icon
  74:    * @return the created transparent icon.
  75:    */
  76:   public static Icon createTransparentIcon (final int width, final int height)
  77:   {
  78:     return new ImageIcon(createTransparentImage(width, height));
  79:   }
  80: }