use_map.cc

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/*    vspline - a set of generic tools for creation and evaluation      */
/*              of uniform b-splines                                    */
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/*! \file use_map.cc
 
    \brief test program for code in map.h
    
    The program creates one gate type each of the types provided in map.h
    over the interval [0,1]. Then it queries a value and uses the gates on
    this value in turn, printing out the result.
*/
 
#include <iostream>
#include <iomanip>
#include <assert.h>
#include <vspline/map.h>
 
const int VSIZE = vspline::vector_traits < double > :: size ;
 
template < class gate_type >
void test ( gate_type gx , double x , const char * mode )
{
  std::cout << mode << std::endl ;
 
  auto tester = vspline::mapper < typename gate_type::in_type > ( gx ) ;
  
  typedef double crd_type ;
 
  const crd_type crd { x } ;
  crd_type res ;
  
  tester.eval ( crd , res ) ;
  
  std::cout << "single-value operation:" << std::endl ;
  
  std::cout << crd << " -> " << res << std::endl ;
 
  if ( VSIZE > 1 )
  {
    typedef vspline::vector_traits < crd_type , VSIZE > :: ele_v crd_v ;
 
    crd_v inv ( crd ) ;
    crd_v resv ;
    
    tester.eval ( inv , resv ) ;
    std::cout << "vectorized operation:" << std::endl
              << inv << " -> " << resv << std::endl ;
  }
}
 
int main ( int argc , char * argv[] )
{
  double x ;
  
  std::cout << std::fixed << std::showpos << std::showpoint
            << std::setprecision(5);
            
  while ( std::cin.good() )
  {
    std::cout << "enter coordinate to map to [ 0.0 : 1.0 ]" << std::endl ;
    std::cin >> x ;
 
    if ( std::cin.eof() )
    {
      std::cout << std::endl ;
      break ;
    }
 
    try
    {
      test ( vspline::reject ( 0.0 , 1.0 ) ,
             x , "REJECT:" ) ;
    }
    catch ( vspline::out_of_bounds )
    {
      std::cout << "exception out_of_bounds" << std::endl ;
    }
    test ( vspline::clamp ( 0.0 , 1.0 , 0.0 , 1.0 ) ,
           x , "CLAMP:" ) ;
           
    test ( vspline::mirror ( 0.0 , 1.0 ) ,
           x , "MIRROR:" ) ;
           
    test ( vspline::periodic ( 0.0 , 1.0 ) ,
           x , "PERIODIC:" ) ;
  }
}