www.pudn.com > jfreereport-0.8.3f.zip > ImageRenderFunction.java

/** 
 * ======================================== 
 * JFreeReport : a free Java report library 
 * ======================================== 
 * 
 * Project Info:  http://www.jfree.org/jfreereport/index.html 
 * Project Lead:  Thomas Morgner; 
 * 
 * (C) Copyright 2000-2002, by Simba Management Limited and Contributors. 
 * 
 * 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., 59 Temple Place, Suite 330, 
 * Boston, MA 02111-1307, USA. 
 * 
 * ----------------------- 
 * ImageRenderFunction.java 
 * ----------------------- 
 * (C)opyright 2000-2002, by Simba Management Limited. 
 * 
 * $Id: ImageRenderFunction.java,v 1.4.2.1 2003/08/24 14:18:07 taqua Exp $ 
 * 
 * ChangeLog 
 * --------- 
 * 14-Aug-2002 : Initial version 
 * 22-Aug-2002 : Removed System.out statements 
 * 28-Aug-2002 : Documentation 
 */ 
package com.jrefinery.report.demo.helper; 
 
import java.awt.Color; 
import java.awt.Font; 
import java.awt.Graphics2D; 
import java.awt.geom.AffineTransform; 
import java.awt.image.BufferedImage; 
import java.io.Serializable; 
import javax.swing.JButton; 
import javax.swing.JRadioButton; 
 
import com.jrefinery.report.ImageReference; 
import com.jrefinery.report.event.PageEventListener; 
import com.jrefinery.report.event.ReportEvent; 
import com.jrefinery.report.function.AbstractFunction; 
 
/** 
 * The ImageRenderFunction creates a simple Image using a BufferedImage within a function to show 
 * the use of the ImageFunctionElement. The image is created whenever a new page is started. 
 * 
 * @author Thomas Morgner 
 */ 
public class ImageRenderFunction extends AbstractFunction  
  implements Serializable, PageEventListener 
{ 
  /** The function value. */ 
  private transient ImageReference functionValue; 
 
  /** 
   * Create a image according to the current state, simple and silly ... 
   * 
   * @param event  the report event. 
   */ 
  public void pageStarted(final ReportEvent event) 
  { 
    final BufferedImage image = new BufferedImage(150, 50, BufferedImage.TYPE_INT_ARGB); 
    final Graphics2D g2 = image.createGraphics(); 
    final JButton bt = new JButton("A Button"); 
    bt.setSize(90, 20); 
    final JRadioButton radio = new JRadioButton("A radio button"); 
    radio.setSize(100, 20); 
 
    g2.setColor(Color.darkGray); 
    bt.paint(g2); 
    g2.setColor(Color.blue); 
    g2.setTransform(AffineTransform.getTranslateInstance(20, 20)); 
    radio.paint(g2); 
    g2.setTransform(AffineTransform.getTranslateInstance(0, 0)); 
    g2.setPaint(Color.green); 
    g2.setFont(new Font("Serif", Font.PLAIN, 10)); 
    g2.drawString("You are viewing a graphics of JFreeReport on index " 
        + event.getState().getCurrentDisplayItem(), 10, 10); 
 
    functionValue = new ImageReference(image); 
  } 
 
   
  /** 
   * Return the last generated Image. 
   * 
   * @return the function value. 
   */ 
  public Object getValue() 
  { 
    return functionValue; 
  } 
   
 
  /** 
   * Receives notification that a page was canceled by the ReportProcessor. 
   * This method is called, when a page was removed from the report after 
   * it was generated. 
   * 
   * @param event The event. 
   */ 
  public void pageCanceled(ReportEvent event) 
  { 
    functionValue = null; 
  } 
 
}