/****************************************************************************
** COPYRIGHT (C):    1997 Cay S. Horstmann. All Rights Reserved.
** PROJECT:          Practical OO Development with C++ and Java
** FILE:             Point.java
** PURPOSE:          shape class
** VERSION           1.0
** PROGRAMMERS:      Cay Horstmann (CSH)
** RELEASE DATE:     3-15-97 (CSH)
** UPDATE HISTORY:
****************************************************************************/

package practicaloo;

import java.awt.Graphics;
import java.io.PrintStream;

public class Point implements Cloneable
{   public Point(int x, int y)
    {   _x = x;
        _y = y;
    }

    public Object clone()
    {   try
        {   return super.clone();
        } catch(CloneNotSupportedException e)
        {   return null;
        }
    }

    public void move(int dx, int dy)
    {   _x += dx;
        _y += dy;
    }

    public void scale(Point center, double scalefactor)
    {   _x = (int)(_x * scalefactor + center._x * (1 - scalefactor));
        _y = (int)(_y * scalefactor + center._y * (1 - scalefactor));
    }

    public int get_x()
    {   return _x;
    }

    public int get_y()
    {   return _y;
    }

    public void plot(Graphics g)
    {   g.fillOval(_x - 2, _y - 2, 5, 5);
    }

    public void print(PrintStream p)
    {   p.print(System.out);
    }

    public double distance(Point p)
    {  return Math.sqrt(Math.pow(_x - p.get_x(), 2) +
            Math.pow(_y - p.get_y(), 2));
    }

    public double angle(Point p)
    {   return Math.atan2(p.get_y() - _y, p.get_x() - _x);
    }


    private int _x;
    private int _y;
}