lab3/Shape.java

   1 /*
   2  * Shape.java
   3  *
   4  * Version:
   5  *     $Id: Shape.java,v 1.1 2007/08/16 19:10:01 vcss232 Exp $
   6  *
   7  * Revisions:
   8  *     $Log: Shape.java,v $
   9  *     Revision 1.1  2007/08/16 19:10:01  vcss232
  10  *     Initial revision
  11  *
  12  */
  13
  14 /**
  15  * Shape is an abstract class to implement a basic shape.
  16  *
  17  * @author     Karen A Atkinson
  18  *
  19  */
  20
  21 abstract public class Shape extends Object {
  22
  23     private double xPos;    // x position of shape
  24     private double yPos;    // y position of shape
  25
  26     /**
  27      * Construct the shape at the specified position
  28      *
  29      * @param    xLoc    x location for shape
  30      * @param    yLoc    y location for shape
  31      */
  32
  33     public Shape( double xLoc, double yLoc ) {
  34         xPos = xLoc;
  35         yPos = yLoc;
  36     }
  37
  38     /**
  39      *   Compute the area of the shape.
  40      *
  41      *   @return    the area of the shape
  42      */
  43
  44     abstract public double area();
  45
  46     /**
  47      * Stretches the size of the shape by multiplying
  48      * each of the dimensions of the shape by the factor
  49      * provided.  For example, if the factor is .5, then each of
  50      * the dimensions would be cut in half.
  51      *
  52      * @param    factor    factor to stretch by
  53      *
  54      * @exception ShapeException Exception thrown by subclass for negative
  55      *                           factor.
  56      */
  57
  58     abstract public void stretchBy( double factor ) throws ShapeException;
  59
  60     /**
  61      * Return the x coordinate of the current location of the shape.
  62      *
  63      * @return   x coordinate of the shape
  64      */
  65
  66     public final double getXPos() {
  67         return xPos;
  68     }
  69
  70     /**
  71      * Return the y coordinate of the current location of the shape.
  72      *
  73      * @return    y corrdinate of the shape
  74      */
  75
  76     public final double getYPos() {
  77         return yPos;
  78     }
  79
  80     /**
  81      * Move the shape to a new location.
  82      *
  83      * @param    xLoc    new X location
  84      * @param    yLoc    new Y location
  85      *
  86      */
  87
  88     public void moveTo( double xLoc, double yLoc ) {
  89         xPos = xLoc;
  90         yPos = yLoc;
  91     }
  92
  93     /**
  94      *  Return a string representation of this shape.
  95      *
  96      *  @return a string representation of this shape.
  97      *
  98      */
  99
 100      public String toString() {
 101          return "Shape";
 102      }
 103
 104 } // Shape