/*
   * Copyright (c) 2003, The JUNG Authors 
   *
   * All rights reserved.
   *
   * This software is open-source under the BSD license; see either
   * "license.txt" or
   * https://github.com/jrtom/jung/blob/master/LICENSE for a description.
   */
  package edu.uci.ics.jung.visualization;
  
  import java.awt.Dimension;
  import java.awt.Graphics2D;
  import java.awt.Image;
  import java.awt.RenderingHints;
  import java.awt.geom.Point2D;
  import java.awt.image.BufferedImage;
  import java.util.HashMap;
  import java.util.Map;
  
  import edu.uci.ics.jung.algorithms.layout.Layout;
  
  /**
   * A class that could be used on the server side of a thin-client application. It creates the jung
   * visualization, then produces an image of it.
   * @author tom
   *
   * @param <V> the vertex type
   * @param <E> the edge type
   */
  @SuppressWarnings("serial")
  public class VisualizationImageServer<V,E> extends BasicVisualizationServer<V,E> {
  
      Map<RenderingHints.Key, Object> renderingHints = new HashMap<RenderingHints.Key, Object>();
      
      /**
       * Creates a new instance with the specified layout and preferred size.
       * 
       * @param layout the Layout instance; provides the vertex locations
       * @param preferredSize the preferred size of the image
       */
      public VisualizationImageServer(Layout<V,E> layout, Dimension preferredSize) {
          super(layout, preferredSize);
          setSize(preferredSize);
          renderingHints.put(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
          addNotify();
      }
      
      public Image getImage(Point2D center, Dimension d) 
      {
          int width = getWidth();
          int height = getHeight();
          
          float scalex = (float)width/d.width;
          float scaley = (float)height/d.height;
          try 
          {
              renderContext.getMultiLayerTransformer().getTransformer(Layer.VIEW).scale(scalex, scaley, center);
      
              BufferedImage bi = new BufferedImage(width, height,
                      BufferedImage.TYPE_INT_RGB);
              Graphics2D graphics = bi.createGraphics();
              graphics.setRenderingHints(renderingHints);
              paint(graphics);
              graphics.dispose();
              return bi;
          } finally {
          	renderContext.getMultiLayerTransformer().getTransformer(Layer.VIEW).setToIdentity();
          }
      }
  }