/* * Diagram Editor Application * -------------------------- * * *** Java version *** *  * FILE:     Drawing.java * * JDK:      Compatible with JDK 1.5 * * CONTENTS: Definition of class "Drawing" * * AUTHOR:   Zhangyi *  * HISTORY:  Written October 2004 */
import java.awt.* ;import java.util.* ;public class Diagram{  private Vector elements = new Vector(16) ;  public void add( Element e )  {    elements.addElement(e) ;  }  public void remove( Element e )  {    elements.removeElement(e) ;  }  public Element find( Point p )  {    Enumeration cnum = elements.elements() ;    while (cnum.hasMoreElements()) {      Element e = (Element) cnum.nextElement() ;      if (e.contains(p)) {        return e ;      }    }    return null ;  }  public void draw( Graphics g )  {    Enumeration cnum = elements.elements() ;    while (cnum.hasMoreElements()) {      Element e = (Element) cnum.nextElement() ;      e.draw(g) ;    }  }}