point.java

生物物种进化历程的演示

/*
   Copyright (c) 2002 Compaq Computer Corporation
   
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   a copy of this software and associated documentation files (the
   "Software"), to deal in the Software without restriction, including
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   permit persons to whom the Software is furnished to do so, subject to
   the following conditions:
   
   - Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.
   
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     notice, this list of conditions and the following disclaimer in the
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   - Neither the names of Compaq Research, Compaq Computer Corporation
     nor the names of its contributors may be used to endorse or promote
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     permission.
   
   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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   IN NO EVENT SHALL COMPAQ COMPUTER CORPORATION BE LIABLE FOR ANY CLAIM,
   DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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*/

package TreeJuxtaposer;


/**
 * A class representing a point in a plane. 
 * Has integer (pixel) (x,y) coordinates stored in (p[0],p[1]).
 * 
 * @author  Yunhong Zhou
 * @see AccordionDrawer.Tree 
 * @see AccordionDrawer.TreeNode
 *
 */

class Point
{
    /** private data */
    private int[] p=new int[2];
	
    /**
     * Constructor
     * @param x1 the first coordinate
     * @param y1 the second coordinate
     */
    public Point (int x1, int y1)
    {
	p[0] = x1;
	p[1] = y1;
    }

    /** 
     * copy constructor 
     * @param pp the pointed to be copied
     */
    public Point (Point pp)
    {
	p[0] = pp.get(0);
	p[1] = pp.get(1);
    }
 

    /** Get one coordinate from the point object
     * @param i The parameter can only be either 0 or 1
     */
    int get(int i)
    {
	return p[i];
    }

    void set(int i,int x) 
    { 
	p[i]= x;
    }

    /** two points are equal if their corresponding coordinates are all equal */
    boolean equals (Point pp)
    {
   	boolean eq=true;
   	int i=0;
   	while ((i<pp.length()) && eq) 
	    eq = (p[i]==pp.get(i));
	
   	return eq;
    }

    /** output the point as a string */
    public String toString()
    {
	return p[0]+" "+p[1];
    }
   
    /** the length of the p array should be 2 */
    int length()
    {
	return p.length;
    }
 
    /** to make a copy of the point */
    public Object clone()
    {
	return new Point(this);
    }
  
};