content: /*
   *    This program is free software; you can redistribute it and/or modify
   *    it under the terms of the GNU General Public License as published by
   *    the Free Software Foundation; either version 2 of the License, or
   *    (at your option) any later version.
   *
   *    This program 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 General Public License for more details.
   *
   *    You should have received a copy of the GNU General Public License
   *    along with this program; if not, write to the Free Software
   *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   */
  
  /*
   * PNGWriter.java
   * Copyright (C) 2007 University of Waikato, Hamilton, New Zealand
   */
  
  package weka.gui.visualize;
  
  import java.awt.Color;
  import java.awt.Graphics;
  import java.awt.Graphics2D;
  import java.awt.image.BufferedImage;
  import java.io.File;
  
  import javax.imageio.ImageIO;
  import javax.swing.JComponent;
  
  /**
   * This class takes any JComponent and outputs it to a PNG-file.
   * Scaling is by default disabled, since we always take a screenshot.
   * 
   * @author  fracpete (fracpete at waikato dot ac dot nz)
   * @version $Revision: 5920 $
   */
  public class PNGWriter
    extends JComponentWriter {
  
    /** the background color. */
    protected Color m_Background;
    
    /**
     * initializes the object.
     */
    public PNGWriter() {
      super();
    }
  
    /**
     * initializes the object with the given Component.
     * 
     * @param c		the component to print in the output format
     */
    public PNGWriter(JComponent c) {
      super(c);
    }
  
    /**
     * initializes the object with the given Component and filename.
     * 
     * @param c		the component to print in the output format
     * @param f		the file to store the output in
     */
    public PNGWriter(JComponent c, File f) {
      super(c, f);
    }
    
    /**
     * further initialization.
     */
    public void initialize() {
      super.initialize();
      
      setScalingEnabled(false);
    }
  
    /**
     * returns the name of the writer, to display in the FileChooser.
     * must be overridden in the derived class.
     * 
     * @return 		the name of the writer
     */
    public String getDescription() {
      return "PNG-Image";
    }
    
    /**
     * returns the extension (incl. ".") of the output format, to use in the
     * FileChooser. 
     * 
     * @return 		the file extension
     */
    public String getExtension() {
      return ".png";
    }
    
    /**
     * returns the current background color.
     * 
     * @return		the current background color
     */
    public Color getBackground() {
      return m_Background;
    }
    
    /**
     * sets the background color to use in creating the PNG.
     * 
     * @param c 		the color to use for background
     */
    public void setBackground(Color c) {
      m_Background = c;
    }
    
    /**
     * generates the actual output.
     * 
     * @throws Exception	if something goes wrong
     */
    public void generateOutput() throws Exception {
      BufferedImage	bi;
      Graphics		g;
  
      bi = new BufferedImage(getComponent().getWidth(), getComponent().getHeight(), BufferedImage.TYPE_INT_RGB);
      g  = bi.getGraphics();
      g.setPaintMode();
      g.setColor(getBackground());
      if (g instanceof Graphics2D)
        ((Graphics2D) g).scale(getXScale(), getYScale());
      g.fillRect(0, 0, getComponent().getWidth(), getComponent().getHeight());
      getComponent().printAll(g);
      ImageIO.write(bi, "png", getFile());
    }
    
    /**
     * for testing only.
     * 
     * @param args 	the commandline arguments
     * @throws Exception 	if something goes wrong
     */
    public static void main(String[] args) throws Exception {
      System.out.println("building TreeVisualizer...");
      weka.gui.treevisualizer.TreeBuild builder = new weka.gui.treevisualizer.TreeBuild();
      weka.gui.treevisualizer.NodePlace arrange = new weka.gui.treevisualizer.PlaceNode2();
      weka.gui.treevisualizer.Node top = builder.create(new java.io.StringReader("digraph atree { top [label=\"the top\"] a [label=\"the first node\"] b [label=\"the second nodes\"] c [label=\"comes off of first\"] top->a top->b b->c }"));
      weka.gui.treevisualizer.TreeVisualizer tv = new weka.gui.treevisualizer.TreeVisualizer(null, top, arrange);
      tv.setSize(800 ,600);
      
      String filename = System.getProperty("java.io.tmpdir") + File.separator + "test.png";
      System.out.println("outputting to '" + filename + "'...");
      toOutput(new PNGWriter(), tv, new File(filename));
  
      System.out.println("done!");
    }
  }
  