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  1. /*
  2.  * Copyright (c) 2008, Manuel Mausz <manuel at mausz.at>
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions are met:
  7.  *     * Redistributions of source code must retain the above copyright
  8.  *       notice, this list of conditions and the following disclaimer.
  9.  *     * Redistributions in binary form must reproduce the above copyright
  10.  *       notice, this list of conditions and the following disclaimer in the
  11.  *       documentation and/or other materials provided with the distribution.
  12.  *     * Neither the name of the copyright holders nor the
  13.  *       names of its contributors may be used to endorse or promote products
  14.  *       derived from this software without specific prior written permission.
  15.  *
  16.  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17.  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18.  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  19.  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  20.  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  22.  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
  23.  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  24.  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  25.  * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
  26.  * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
  27.  * DAMAGE.
  28.  */
  29.  
  30. /**
  31.  * Complex encapsulate a complex value
  32.  *
  33.  * @version 1.0
  34.  * @author  Manuel Mausz (manuel at mausz.at)
  35.  * @author  http://manuel.mausz.at/
  36.  */
  37. final public class Complex extends CalcValue
  38. {
  39.   final private double real;
  40.   final private double img;
  41.  
  42.   /**
  43.    * Constructor
  44.    *
  45.    * @param real real part
  46.    * @param img imaginary part
  47.    */
  48.   Complex(double real, double img)
  49.   {
  50.     addOps();
  51.     this.real = real;
  52.     this.img  = img;
  53.   }
  54.  
  55.   /**
  56.    * Add supported operations
  57.    */
  58.   private void addOps()
  59.   {
  60.     addOp(new CalcOperator("+"), "add");
  61.     addOp(new CalcOperator("-"), "sub");
  62.     addOp(new CalcOperator("*"), "mul");
  63.   }
  64.  
  65.   /**
  66.    * @return real part
  67.    */
  68.   public double getReal()
  69.   {
  70.     return real;
  71.   }
  72.  
  73.   /**
  74.    * @return imaginary part
  75.    */
  76.   public double getImg()
  77.   {
  78.     return img;
  79.   }
  80.  
  81.  
  82.   /**
  83.    * Converts instance to string
  84.    *
  85.    * @return string
  86.    */
  87.   public String toString()
  88.   {
  89.     return real + " " + img;
  90.   }
  91.  
  92.   /**
  93.    * Addition
  94.    *
  95.    * @param val
  96.    * @return new Complex instance
  97.    */
  98.   public Complex add(Complex val)
  99.   {
  100.     return new Complex(real + val.getReal(), img + val.getImg());
  101.   }
  102.  
  103.   /**
  104.    * Subtraction
  105.    *
  106.    * @param val
  107.    * @return new Complex instance
  108.    */
  109.   public Complex sub(Complex val)
  110.   {
  111.     return new Complex(real - val.getReal(), img - val.getImg());
  112.   }
  113.  
  114.   /**
  115.    * Multiplication
  116.    *
  117.    * @param val
  118.    * @return new Complex instance
  119.    */
  120.   public Complex mul(Complex val)
  121.   {
  122.     double realnew = real * val.getReal() - img * val.getImg();
  123.     double imgnew  = real * val.getImg()  + img * val.getReal();
  124.     return new Complex(realnew, imgnew);
  125.   }
  126. }
  127.