/******************************************************************/
/* This file is part of the homework assignments for CSCI-427/527 */
/* at The College of William & Mary and authored by Pieter Peers. */
/* No part of this file, whether altered or in original form, can */
/* be distributed or used outside the context of CSCI-427/527     */
/* without consent of either the College of William & Mary or     */
/* Pieter Peers.                                                  */
/******************************************************************/
#include "linear_intersector.h"

//////////////////
// Constructors //
//////////////////
linear_intersector::linear_intersector(void)
  : intersector_base()
{
  // Do nothing
}


linear_intersector::linear_intersector(const std::vector<std::shared_ptr<const boundedPrimitive>>& compounds)
  : intersector_base()
{
  _compounds = compounds;
}

  
/////////////
// Methods //
/////////////
intersectionPoint linear_intersector::intersect(const ray& r) const
{
  intersectionPoint ip;

  // if no compounds registered => no hit.
  if(_compounds.empty()) return ip;

  // cycle through the list
  for(auto itr=_compounds.begin(); itr != _compounds.end(); itr++)
  {
    // intersect
    intersectionPoint newIp = (*itr)->intersect(r);

    // keep track of closest
    if(newIp < ip) ip = newIp;
  }

  // Done.
  return ip;
}