ImPoint.java

/*
 * ImPoint     Immutable Point class.  
 *
 *  author: CMB
 *
 * Mostly packages together an (x,y) coordinate pair into one object.
 * Also includes conversion to java.awt.Point2D for use with the
 * graphics system.
 *
 */

import java.awt.geom.Point2D;

class ImPoint {

    /**
       Creates the point with coordinates (x,y)
     */
    public ImPoint(int x, int y) {
	this.x = x;
	this.y = y;
    }

    /**
       Returns an ImPoint with coordinates translated by deltaX
       and deltaY from this point.
    */
    public ImPoint translate(int deltaX, int deltaY) {
	return new ImPoint(x + deltaX, y + deltaY);
    }

    /**
       Returns a String version of the Point for debugging purposes.

       In Java toString is a special function.  You are allowed to do
       a call like the following, and toString will get automatically
       called to do the conversion:

           ImPoint myImPoint . . .;
	   . . .
           System.out.println(myImPoint);

    */
    public String toString() {
	return "ImPoint[" + x + "," + y + "]";
    }

    /*
     *  Retursn a Point2D with same coordinates as this point
     *
     */
    public Point2D getPoint2D() {
	return new Point2D.Double(x, y);
    }

    /*
     * Returns the x-coordinate of the point.
     */
    public int getX() {
	return x;
    }

    /*
     * Returns the y-coordinate of the point.
     */
    public int getY() {
	return y;
    }



    private int x;
    private int y;
}