arc.cpp

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/**
 *\file         arc.cpp
 *
 *\brief        
 *
 *\author       Xianming Chen\n
 *              Computer Science Department\n
 *              University of Utah
 *
 *\date         19 Aug 2006\n
 *              Copyright (c) 2006, University of Utah
 */



#include "euler.h"
#include "print.h"
#include <cmath>


namespace euler
{
  /**
   *  construct an arc at xy-plane, assume the start point of arc (e->v) is positioned at angle theta1.
   *  return the edge tailed at the last vertex.
   */
  edge_t* face_t :: arc(edge_t* e, point_t const& cntr, float r, float theta1, float theta2, int segs)
  {
    loop_t *l = e->l;
    float step = (theta2-theta1)/segs, theta = step;
    for(int i=0; i<segs; i++, theta += step)
    {
      e = l->mev(e, point_t (cntr[0] + r * cos( theta ),
                              cntr[1] + r * sin( theta ),
                              cntr[2]));
    }
    l->del_single_vertex_edge_pair(); 
    return e;
  }



}//end namespace euler

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