xaxis.c

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 */


#include "extern.h"

struct X_AXIS_ARRAY {
        double chans;
        double vel;
        double freq;
};

struct X_AXIS_ARRAY x_axis_array[MAX_CHANS];

/* This version was from xgraphic.c */
int computeXaxis(image, logit)
struct LP_IMAGE_INFO *image;
int logit;
{
  int i, n;
  struct HEADER *h;
  float *p;

  h = &image->head;

  n = h->noint;
  if(image->pinfo.x1mode == XMODE_FREQ)
  {
    if(logit)
    {
      st_report("# Loading X1-Axis with Frequency Values");
    }

    p = &image->x1data[0];
    if( h->sideband == 2.0)
    {
      for(i=0;i<n;i++,p++)
      {
        *p = -(h->refpt * h->freqres) + ((float)i * h->freqres);
      }
    }
    else
    {
      for(i=0;i<n;i++,p++)
      {
        *p = +(h->refpt * h->freqres) - ((float)i * h->freqres);
        *p *= -1.0;
      }
    }
  }
  else
  if(image->pinfo.x1mode == XMODE_VEL)
  {

    if(logit)
    {
      st_report("# Loading X1-Axis with Velocity Values");
    }

    p = &image->x1data[0];
    if( h->sideband == 2.0)
    {
      for(i=0;i<h->noint;i++,p++)
      {
        *p = (float)(h->refpt_vel - (h->refpt * h->deltax) + ((i+1) * h->deltax));
      }
    }
    else
    {
      for(i=0;i<h->noint;i++,p++)
      {
        *p = (float)(h->refpt_vel - (h->refpt * h->deltax) + ((i+1) * h->deltax));
      }
    }
  }
  else
  if(image->pinfo.x1mode == XMODE_CHAN)
  {
    if(logit)
    {
      st_report("# Loading X1-Axis with Channel Numbers");
    }

    p = &image->x1data[0];
    for(i=0;i<h->noint;i++,p++)
    {
      *p = (float)i;
    }
  }

  if(image->pinfo.x2mode == XMODE_FREQ)
  {
    if(logit)
    {
      st_report("# Loading X2-Axis with Frequency Values");
    }

    p = &image->x2data[0];
    if( h->sideband == 2.0)
    {
      for(i=0;i<n;i++,p++)
      {
        *p = -(h->refpt * h->freqres) + ((float)i * h->freqres);
      }
    }
    else
    {
      for(i=0;i<n;i++,p++)
      {
        *p = +(h->refpt * h->freqres) - ((float)i * h->freqres);
        *p *= -1.0;
      }
    }
  }
  else
  if(image->pinfo.x2mode == XMODE_VEL)
  {

    if(logit)
    {
      st_report("# Loading X2-Axis with Velocity Values");
    }

    p = &image->x2data[0];
    if( h->sideband == 2.0)
    {
      for(i=0;i<h->noint;i++,p++)
      {
        *p = (float)(h->refpt_vel - (h->refpt * h->deltax) + ((i+1) * h->deltax));
      }
    }
    else
    {
      for(i=0;i<h->noint;i++,p++)
      {
        *p = (float)(h->refpt_vel - (h->refpt * h->deltax) + ((i+1) * h->deltax));
      }
    }
  }
  else
  if(image->pinfo.x2mode == XMODE_CHAN)
  {
    if(logit)
    {
      st_report("# Loading X2-Axis with Channel Numbers");
    }

    p = &image->x2data[0];
    for(i=0;i<h->noint;i++,p++)
    {
      *p = (float)i;
    }
  }

  return(0);
}


int makeXaxisArray(image)
struct LP_IMAGE_INFO *image;
{
  int i, n;
  struct HEADER *h;
  struct X_AXIS_ARRAY *p;

  h = &image->head;
  n = h->noint;

  p = &x_axis_array[0];
  if( h->sideband == 2.0)
  {
    for(i=0;i<n;i++,p++)
    {
      p->chans = (double)i;
      p->freq = -(h->refpt * h->freqres) + ((float)i * h->freqres);
    }
  }
  else
  {
    for(i=0;i<n;i++,p++)
    {
      p->chans = (double)i;
      p->freq = +(h->refpt * h->freqres) - ((float)i * h->freqres);
      p->freq *= -1.0;
    }
  }

  p = &x_axis_array[0];
  if( h->sideband == 2.0)
  {
    for(i=0;i<h->noint;i++,p++)
    {
      p->vel = (float)(h->refpt_vel - (h->refpt * h->deltax) + ((i+1) * h->deltax));
    }
  }
  else
  {
    for(i=0;i<h->noint;i++,p++)
    {
      p->vel = (float)(h->refpt_vel - (h->refpt * h->deltax) + ((i+1) * h->deltax));
    }
  }

  return(0);
}


int findXaxisElement(image, x1, x2, b, e)
struct LP_IMAGE_INFO *image;
double x1, x2;
int *b, *e;
{
  int i, indx, n;
  double ddiff;
  struct HEADER *h;
  struct X_AXIS_ARRAY *p;

  *b = 0;
  *e = 0;

  h = &image->head;
  n = h->noint;

  if(image->pinfo.x1mode == XMODE_FREQ)
  {
    ddiff = 99999999.9;
    p = &x_axis_array[0];
    for(i=0;i<n;i++,p++)
    {
      if(fabs(p->freq-x1) < ddiff)
      {
        indx = i;
        ddiff = fabs(p->freq-x1);
      }
    }

    *b = indx;

    ddiff = 99999999.9;
    p = &x_axis_array[0];
    for(i=0;i<n;i++,p++)
    {
      if(fabs(p->freq-x2) < ddiff)
      {
        indx = i;
        ddiff = fabs(p->freq-x2);
      }
    }

    *e = indx;

    return(0);
  }
  else
  if(image->pinfo.x1mode == XMODE_VEL)
  {
    ddiff = 99999999.9;
    p = &x_axis_array[0];
    for(i=0;i<n;i++,p++)
    {
      if(fabs(p->vel-x1) < ddiff)
      {
        indx = i;
        ddiff = fabs(p->vel-x1);
      }
    }

    *b = indx;

    ddiff = 99999999.9;
    p = &x_axis_array[0];
    for(i=0;i<n;i++,p++)
    {
      if(fabs(p->vel-x2) < ddiff)
      {
        indx = i;
        ddiff = fabs(p->vel-x2);
      }
    }

    *e = indx;

    return(0);
  }
  else
  if(image->pinfo.x1mode == XMODE_CHAN)
  {
    *b = (int)x1;
    *e = (int)x2;

    return(0);
  }
  else
  {
    return(1);
  }

  return(1);
}