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Differences Between: [Versions 39 and 311]

   1  <?php
   2  
   3  /**
   4   *
   5   * Function code for the complex theta() function
   6   *
   7   * @copyright  Copyright (c) 2013-2018 Mark Baker (https://github.com/MarkBaker/PHPComplex)
   8   * @license    https://opensource.org/licenses/MIT    MIT
   9   */
  10  namespace Complex;
  11  
  12  /**
  13   * Returns the theta of a complex number.
  14   *   This is the angle in radians from the real axis to the representation of the number in polar coordinates.
  15   *
  16   * @param     Complex|mixed    $complex    Complex number or a numeric value.
  17   * @return    float            The theta value of the complex argument.
  18   * @throws    Exception        If argument isn't a valid real or complex number.
  19   */
  20  function theta($complex)
  21  {
  22      $complex = Complex::validateComplexArgument($complex);
  23  
  24      if ($complex->getReal() == 0.0) {
  25          if ($complex->isReal()) {
  26              return 0.0;
  27          } elseif ($complex->getImaginary() < 0.0) {
  28              return M_PI / -2;
  29          }
  30          return M_PI / 2;
  31      } elseif ($complex->getReal() > 0.0) {
  32          return \atan($complex->getImaginary() / $complex->getReal());
  33      } elseif ($complex->getImaginary() < 0.0) {
  34          return -(M_PI - \atan(\abs($complex->getImaginary()) / \abs($complex->getReal())));
  35      }
  36  
  37      return M_PI - \atan($complex->getImaginary() / \abs($complex->getReal()));
  38  }