package edu.uci.ics.jung.visualization;
   
   import java.awt.Component;
   import java.awt.Dimension;
   import java.awt.Graphics;
   import java.awt.Image;
   import java.util.LinkedHashSet;
   import java.util.Set;
   
  import javax.swing.Icon;
  import javax.swing.ImageIcon;
  
  /**
   * An icon that is made up of a collection of Icons.
   * They are rendered in layers starting with the first
   * Icon added (from the constructor).
   * 
   * @author Tom Nelson
   *
   */
  @SuppressWarnings("serial")
  public class LayeredIcon extends ImageIcon {
  
  	Set<Icon> iconSet = new LinkedHashSet<Icon>();
  
  	public LayeredIcon(Image image) {
  	    super(image);
  	}
  
  	public void paintIcon(Component c, Graphics g, int x, int y) {
          super.paintIcon(c, g, x, y);
          Dimension d = new Dimension(getIconWidth(), getIconHeight());
  		for (Icon icon : iconSet) {
  			Dimension id = new Dimension(icon.getIconWidth(), icon.getIconHeight());
  			int dx = (d.width - id.width)/2;
  			int dy = (d.height - id.height)/2;
  			icon.paintIcon(c, g, x+dx, y+dy);
  		}
  	}
  
  	public void add(Icon icon) {
  		iconSet.add(icon);
  	}
  
  	public boolean remove(Icon icon) {
  		return iconSet.remove(icon);
  	}
  }