nodelist.java

用Java开发的、实现类似Visio功能的应用程序源码

/**
 *    $Id:NodeList.java $
 *
 *    Copyright 2004 ~ 2005  JingFei International Cooperation LTD. All rights reserved. *
 */
package com.jfimagine.jfgraph.shape.base;


import java.awt.Graphics;
import java.awt.Color;

import java.util.List;
import java.util.ArrayList;
import java.util.Iterator;

import com.jfimagine.jfgraph.shape.base.AbstractObject;
import com.jfimagine.jfgraph.shape.base.ObjectList;
import com.jfimagine.jfgraph.shape.base.Node;
 
import com.jfimagine.jfgraph.geom.GeomConst;
import com.jfimagine.jfgraph.geom.JFPoint;
import com.jfimagine.jfgraph.geom.Rect;
 
 /**
 * NodeList class. A node list is used to manipulate node issues.
 *
 * @author     CookieMaker    
 *
 * @version $Revision: 1.00 $
 */  
 public class NodeList extends ObjectList{

   /**
    *   A XML string tag represents a  Node List
    */
   public  static final String	 XML_NODELIST		="NodeList";

   /**
    *   Constructor for NodeList
    */
   public NodeList(){
   	setObjectType(ShapeConst.OBJECTTYPE_NODELIST);
   	setXMLTag(XML_NODELIST);
   }	


   /**
    *   Set parent object  of each node in the list.
    *   @param parentId A new id of a  parent object.
    */
   public void	setParent(AbstractObject obj){
   	if (obj==null) return;
   	
   	Iterator it	=m_objectList.iterator();
	while (it!=null && it.hasNext()){
		Node node	=(Node)it.next();
		node.setParent(obj);
	}
   }
   

   /**
    *   Get the index of a node within the list.
    * 
    *   @param node A node to be found.
    *
    *   @return  The index.
    *
    */ 	
  public int getIndex(Node node){
        if (node==null)  return -1;
        try{
                return getIndexByObjectId(node.getObjectId());
        }catch(Exception e){
                return -1;
        }
  }


   /**
    *   Creates a new AbstractObject of the same class and with the same contents as this object.
    *   This method implements the method defined in AbstractObject.
    * 
    *   @return  A clone of this class.
    *
    */ 	
  protected AbstractObject cloneMe() throws CloneNotSupportedException{
  	return new NodeList();
  }


   /**
    *   Draw current object on graphic canvas.
    * 
    *   @param  g  A graphic canvas.	
    *   @param ifRotate If user's operation or other actions force objects to be rotated.
    *
    */ 	
   public void  draw(Graphics g, boolean ifRotate){
   	if (g==null)
   		return;

   	Iterator it	=m_objectList.iterator();
	while (it!=null && it.hasNext()){
		Node node	=(Node)it.next();
		node.draw(g,ifRotate);
	}
   }


   /**
    *   Get which node that intersects with point pnt.
    * 
    *   @param  pnt A JFPoint used to test intersection.
    *   @param  usage Purpose to get a node intersected, e.g. move or rotate. 
    *
    *   @return A node of current shape.
    *
    */ 	
   public Node  nodeIntersects(JFPoint pnt,int usage){
   	Iterator it	=m_objectList.iterator();
	while (it!=null && it.hasNext()){
		Node node	=(Node)it.next();
		if (node.intersects(pnt))
			return node;
	}
   	return null;
   }


   /**
    *   Get the maximum bounds of this all nodes.
    *
    *   @return The bounds rectangle of all nodes.
    *
    */ 	
   public Rect getBounds(){
  	
   	double minx=GeomConst.LARGE_VALUE,miny=GeomConst.LARGE_VALUE,
   	       maxx=-GeomConst.LARGE_VALUE,maxy=-GeomConst.LARGE_VALUE;


  	Iterator it	=m_objectList.iterator();
	while (it!=null && it.hasNext()){
		Node node	=(Node)it.next();
		
		minx	=Math.min(minx,node.getXOffset());
		miny	=Math.min(miny,node.getYOffset());
		maxx	=Math.max(maxx,node.getXOffset());
		maxy	=Math.max(maxy,node.getYOffset());
		
	}
	if (minx>maxx) minx	=maxx;
	if (miny>maxy) miny	=maxy;	
	return new Rect(minx,miny,maxx-minx,maxy-miny);   	
   	
   }

   /**
    *   Remove last node in this list.
    *   @return Last node that remained.
    *
    */ 	
   public Node removeLastNode(){
   	try{
   		if (size()==0)
   			return null;
   		else{
   			removeByIndex(size()-1);
   			if (size()==0)
   				return null;
   			else
				return (Node)getByIndex(size()-1); 
   		}
   	}catch(Exception e){	
   		return null;
   	}
   }

    /** set zoom scale of all nodes.
     */	
    public void setZoomScale(double zoomScale){
   	Iterator it	=m_objectList.iterator();
	while (it!=null && it.hasNext()){
		Node node	=(Node)it.next();
		node.setZoomScale(zoomScale);
	}
    }	
      
 	
}