/*
    * SegmentationUtil.java Created on September 26, 2005, 12:11 PM
    */
   
   package org.lcsim.geometry.segmentation;
   
   import static java.lang.Math.atan;
   import static java.lang.Math.atan2;
   import static java.lang.Math.PI;
  import static java.lang.Math.sqrt;
  
  /**
   * Utilities for segmentation classes.
   * 
   * @author jeremym
   */
  public final class SegmentationUtil
  {
      public static double getPhi(double x, double y)
      {
          double phi = atan2(x, y);
  
          if (phi < 0)
          {
              phi += 2 * PI;
          }
  
          return phi;
      }
  
      public static double getTheta(double x, double y, double z)
      {
          double theta = atan(getCylindricalRadius(x, y) / z);
  
          if (theta < 0)
          {
              theta += PI;
          }
  
          return theta;
      }
  
      public static double getCylindricalRadius(double x, double y)
      {
          return sqrt(x * x + y * y);
      }
  }