jfoperationzoom.java

用Java开发的、实现类似Visio功能的应用程序源码

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


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

import com.jfimagine.jfgraph.geom.JFPoint;
import com.jfimagine.jfgraph.shape.base.AbstractObject;
import com.jfimagine.jfgraph.shape.base.AbstractShape;   
import com.jfimagine.jfgraph.shape.base.Label;

import com.jfimagine.jfgraph.shape.union.JFPage;

/**
 *  Class JFOperationZoom is used to record a zoom operation.
 */
public class JFOperationZoom extends JFOperation{

	/**old and new zoom scale*/
	private double m_oldZoomScale=1;
	private double m_newZoomScale=1;

	
	/**  
	 *    Constructor.
	 *    @param page A page that used to do opeation.
	 *    @param oldZoomScale Old zoom scale.
	 *    @param newZoomScale New zoom scale.
	 */        
        public JFOperationZoom(JFPage page,double oldZoomScale, double newZoomScale){
        	m_page	=page;
		setActionId(JFOperation.OPER_ZOOM);
		
		m_oldZoomScale	=oldZoomScale;
		m_newZoomScale	=newZoomScale;		
	}


	/** undo this operation
	 *  @return new objects selected
	 */
	public List undo(){
		m_page.setZoomScale(m_oldZoomScale);
		return null;
	}


	/** redo this operation
	 *  @return new objects selected
	 */
	public List redo(){
		m_page.setZoomScale(m_newZoomScale);
		return null;
	}


}