import java.awt.Point;

/**
* Class to extend the standard java.awt.Point with a z variable for height.
*
* The standard Point class built into java is suitable for 2D work only.
* This class extends it to provide extra functionality in the way of height.
*
* @author Dr Andy Evans
* @version 1.0
* @see java.awt.Point java.awt.Point
*
**/
public class HeightPoint extends Point {



   /**
    * The new variable value.
   **/
   private int z = 0;



   /**
    * Default constructor.
   **/
   public HeightPoint () {
      super();
   }



   /**
    * Extra constructor to deal with height.
    * @see java.awt.Point#Point(int,int) java.awt.Point#Point(int,int)
    * @param x : x coordinate value
    * @param y : y coordinate value
    * @param z : height value
   **/
   public HeightPoint(int x, int y, int z) {
      super(x, y);
      this.z = z;
   }



   /**
    * Mutator method for height.
    * @param z : height value
   **/
   public void setZ(int z) {
      this.z = z;
   }



   /**
    * Accessor method for height.
    * @return z : height value
   **/
   public int getZ() {
      return z;
   }



   /**
    * Gives a String representation of the object.
    * Outputs "x = " + x + " y = " + y + " z = " + z.
   **/
   public String toString() {
      return "x = " + x + " y = " + y + " z = " + z;
   }

}