shift.c

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/* 
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 */


#include "extern.h"

/* Perform the actual shift.  'ashift' contains the number
   of channels to shift +/-; left or right.  ashift must be
   and interger number of channels */

int shift()
{
  int i, n, nn;
  float thold[MAX_CHANS], *f1, *f2;

  if(env->ashift == 0 || env->ashift < -300 || env->ashift > 300)
  {
    st_fail("shift(): ASHIFT %d out of range -300 to 300; but not 0", env->ashift);
    return(1);
  }

  st_report("Shifting data %d channels", env->ashift);

  n = h0->head.noint;

  bzero((char *)&thold[0], sizeof(thold));

  if(env->ashift < 0)
  {
    f1 = &thold[0];
    f2 = &h0->yplot1[abs(env->ashift)];

    nn = n - abs(env->ashift);

    st_report("Moving a total of %d channels left", nn);

    for(i=0;i<nn;i++, f1++, f2++)
    {
      *f1 = *f2;
    }

    bzero((char *)h0->yplot1, sizeof(h0->yplot1));
    bcopy((char *)&thold[0], (char *)h0->yplot1, sizeof(h0->yplot1));

    h0->head.restfreq -= (double)env->ashift*h0->head.freqres;
    h0->head.obsfreq  -= (double)env->ashift*h0->head.freqres;

    setColor(RED);

    if(isSet(PF_D_FLAG))
    {
      st_report("Dropping %d Channels From End", abs(env->ashift));
      env->edrop = abs(env->ashift);
    }
    else
    {
      st_report("Recommend  'edrop=%d'", abs(env->ashift));
    }

    setColor(BLACK);
  }
  else
  {
    f1 = &thold[env->ashift];
    f2 = &h0->yplot1[0];

    nn = n - env->ashift;

    st_report("Moving a total of %d channels Right", nn);

    for(i=0;i<nn;i++, f1++, f2++)
    {
      *f1 = *f2;
    }

    bzero((char *)h0->yplot1, sizeof(h0->yplot1));
    bcopy((char *)&thold[0], (char *)h0->yplot1, sizeof(h0->yplot1));

    h0->head.restfreq -= (double)env->ashift*h0->head.freqres;
    h0->head.obsfreq  -= (double)env->ashift*h0->head.freqres;

    setColor(RED);

    if(isSet(PF_D_FLAG))
    {
      st_report("Dropping %d Channels From Start", abs(env->ashift));
      env->bdrop = abs(env->ashift);
    }
    else
    {
      st_report("Recommend  'bdrop=%d'", env->ashift);
    }

    setColor(BLACK);
  }

  if(notSet(PF_D_FLAG))
  {
    st_report("NOTE: Be sure to '[e|b]drop' the 'shifted' %d chans", env->ashift);
  }

  h0->shifted = env->ashift;

  return(0);
}


int doShift()
{
  return(shift());
}


int compAutoShift()
{
  int f, idiff, ret=0;
  double f1, f2, fdiff;
  struct LP_IMAGE_INFO *first, *second;

  if(strlen(args->secondArg))
  {
    f = parseHarg(args->secondArg);

    if((f >= 0 && f < MAX_IMAGES))
    {
      first  = findImage(f);
      second = h0;

      if(first == second)
      {
        st_fail("autoShift(): First and Second Holders must be different");
        return(1);
      }

      f1 = first->head.restfreq;
      f2 = second->head.restfreq;

      st_report("%s Freq: = %f, %s Freq: = %f", first->name, f1, second->name, f2);

      fdiff = f2 - f1; /* Diff between current and designated freq */
      st_report("diff = %.2f MHz", fdiff);

      idiff = (int)round(fdiff / first->head.freqres);

      if(isSet(PF_O_FLAG)) /* We are shifting the image's into alignment */
      {
        idiff *= -2;

        st_report("Setting Opposite ashift to %d", idiff);
      }
      else
      {
        st_report("Setting ashift to %d", idiff);
      }

      env->ashift = idiff;

      if(env->ashift)
      {
        ret = doShift();
      }
    }
  }

  return(ret);
}