operator_overload.cpp

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/*
 * Copyright (c) 2008, Willow Garage, Inc.
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Willow Garage, Inc. nor the names of its
 *       contributors may be used to endorse or promote products derived from
 *       this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 */
 
#include <vector>
#include <sys/time.h>
 
#include "tf/LinearMath/Transform.h"
 
 
void seed_rand()
{
  //Seed random number generator with current microseond count
  timeval temp_time_struct;
  gettimeofday(&temp_time_struct,NULL);
  srand(temp_time_struct.tv_usec);
};
 
 
int main(int argc, char **argv){
  
  unsigned int runs = 400;
  seed_rand();
  
  std::vector<double> xvalues(runs), yvalues(runs), zvalues(runs);
  for ( unsigned int i = 0; i < runs ; i++ )
  {
    xvalues[i] = 1.0 * ((double) rand() - (double)RAND_MAX /2.0) /(double)RAND_MAX;
    yvalues[i] = 1.0 * ((double) rand() - (double)RAND_MAX /2.0) /(double)RAND_MAX;
    zvalues[i] = 1.0 * ((double) rand() - (double)RAND_MAX /2.0) /(double)RAND_MAX;
  }
    
  //Useful Operator Overload
  for ( unsigned int i = 0; i < runs ; i++ )
  {    
    tf::Transform transform(tf::Quaternion(0,0,0), tf::Vector3(xvalues[i],yvalues[i],zvalues[i]));
    tf::Quaternion initial(xvalues[i],yvalues[i],zvalues[i]);
    tf::Quaternion final(xvalues[i],yvalues[i],zvalues[i]);
    final = transform * initial;
    std::printf("Useful Operator Overload: %f, angle between quaternions\n", initial.angle(final));
  } 
 
  
  return 0;  
}