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/*
* symmetry.c
*
* Symmetry
*
* (c) 2006-2010 Thomas White <taw@physics.org>
*
* Part of CrystFEL - crystallography with a FEL
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include "utils.h"
#ifdef DEBUG
#define SYM_DEBUG STATUS
#else /* DEBUG */
#define SYM_DEBUG(...)
#endif /* DEBUG */
/* Check if a reflection is in the asymmetric unit cell */
static int check_cond(signed int h, signed int k, signed int l, const char *sym)
{
if ( strcmp(sym, "1") == 0 )
return ( 1 );
if ( strcmp(sym, "-1") == 0 )
return ( 1 );
if ( strcmp(sym, "6") == 0 )
return ( ((h>0) && (k>=0)) || ((h==0) && (k==0)) );
if ( strcmp(sym, "6/m") == 0 )
return ( (((h>0) && (k>=0)) || ((h==0) && (k==0))) && (l>=0) );
if ( strcmp(sym, "6/mmm") == 0 )
return ( (((h>0) && (k>=0)) || ((h==0) && (k==0))) && (l>=0)
&& (h>=k) );
/* TODO: Add more groups here */
return 1;
}
/* Macros for checking the above conditions and returning if satisfied */
#define CHECK_COND(h, k, l, sym) \
if ( check_cond((h), (k), (l), (sym)) ) { \
*hp = (h); *kp = (k); *lp = (l); \
return; \
}
int num_equivs(signed int h, signed int k, signed int l, const char *sym)
{
/* 000 is always unique */
if ( (h==0) && (k==0) && (l==0) ) return 1;
if ( strcmp(sym, "1") == 0 ) return 1;
if ( strcmp(sym, "-1") == 0 ) return 2;
if ( strcmp(sym, "6") == 0 ) {
if ( (h==0) && (k==0) ) return 1; /* a */
return 6; /* b */
}
if ( strcmp(sym, "6/m") == 0 ) {
if ( (h==0) && (k==0) ) return 2; /* a */
if ( l == 0 ) return 6; /* b */
return 12; /* c */
}
if ( strcmp(sym, "6/mmm") == 0 ) {
if ( (h==0) && (k==0) ) return 2; /* a */
if ( (l==0) && (h==k) ) return 6; /* b */
if ( (l==0) && (k==0) ) return 6; /* c */
if ( h == k ) return 12; /* d */
if ( k == 0 ) return 12; /* e */
if ( l == 0 ) return 12; /* f */
return 24; /* g */
}
/* TODO: Add more groups here */
return 1;
}
void get_equiv(signed int h, signed int k, signed int l,
signed int *he, signed int *ke, signed int *le,
const char *sym, int idx)
{
signed int i = -h-k;
if ( strcmp(sym, "1") == 0 ) {
*he = h; *ke = k; *le = l; return;
}
if ( strcmp(sym, "-1") == 0 ) {
switch ( idx ) {
case 0 : *he = h; *ke = k; *le = l; return;
case 1 : *he = -h; *ke = -k; *le = -l; return;
}
}
if ( strcmp(sym, "6") == 0 ) {
/* a */
if ( (h==0) && (k==0) ) {
switch ( idx ) {
case 0 : *he = 0; *ke = 0; *le = l; return;
}
}
/* b */
switch ( idx ) {
case 0 : *he = h; *ke = k; *le = l; return;
case 1 : *he = i; *ke = h; *le = l; return;
case 2 : *he = k; *ke = i; *le = l; return;
case 3 : *he = -h; *ke = -k; *le = l; return;
case 4 : *he = -i; *ke = -h; *le = l; return;
case 5 : *he = -k; *ke = -i; *le = l; return;
}
}
if ( strcmp(sym, "6/m") == 0 ) {
/* a */
if ( (h==0) && (k==0) ) {
switch ( idx ) {
case 0 : *he = 0; *ke = 0; *le = l; return;
case 1 : *he = 0; *ke = 0; *le = -l; return;
}
}
/* b-c */
switch ( idx ) {
case 0 : *he = h; *ke = k; *le = l; return;
case 1 : *he = i; *ke = h; *le = l; return;
case 2 : *he = k; *ke = i; *le = l; return;
case 3 : *he = -h; *ke = -k; *le = l; return;
case 4 : *he = -i; *ke = -h; *le = l; return;
case 5 : *he = -k; *ke = -i; *le = l; return;
case 6 : *he = h; *ke = k; *le = -l; return;
case 7 : *he = i; *ke = h; *le = -l; return;
case 8 : *he = k; *ke = i; *le = -l; return;
case 9 : *he = -h; *ke = -k; *le = -l; return;
case 10 : *he = -i; *ke = -h; *le = -l; return;
case 11 : *he = -k; *ke = -i; *le = -l; return;
}
}
if ( strcmp(sym, "6/mmm") == 0 ) {
/* a */
if ( (h==0) && (k==0) ) {
switch ( idx ) {
case 0 : *he = 0; *ke = 0; *le = l; return;
case 1 : *he = 0; *ke = 0; *le = -l; return;
}
}
/* b-g */
switch ( idx ) {
case 0 : *he = h; *ke = k; *le = l; return;
case 1 : *he = i; *ke = h; *le = l; return;
case 2 : *he = k; *ke = i; *le = l; return;
case 3 : *he = -h; *ke = -k; *le = l; return;
case 4 : *he = -i; *ke = -h; *le = l; return;
case 5 : *he = -k; *ke = -i; *le = l; return;
case 6 : *he = k; *ke = h; *le = -l; return;
case 7 : *he = h; *ke = i; *le = -l; return;
case 8 : *he = i; *ke = k; *le = -l; return;
case 9 : *he = -k; *ke = -h; *le = -l; return;
case 10 : *he = -h; *ke = -i; *le = -l; return;
case 11 : *he = -i; *ke = -k; *le = -l; return;
case 12 : *he = -h; *ke = -k; *le = -l; return;
case 13 : *he = -i; *ke = -h; *le = -l; return;
case 14 : *he = -k; *ke = -i; *le = -l; return;
case 15 : *he = h; *ke = k; *le = -l; return;
case 16 : *he = i; *ke = h; *le = -l; return;
case 17 : *he = k; *ke = i; *le = -l; return;
case 18 : *he = -k; *ke = -h; *le = l; return;
case 19 : *he = -h; *ke = -i; *le = l; return;
case 20 : *he = -i; *ke = -k; *le = l; return;
case 21 : *he = k; *ke = h; *le = l; return;
case 22 : *he = h; *ke = i; *le = l; return;
case 23 : *he = i; *ke = k; *le = l; return;
}
}
/* TODO: Add more groups here */
ERROR("Unrecognised symmetry '%s'\n", sym);
abort();
}
void get_asymm(signed int h, signed int k, signed int l,
signed int *hp, signed int *kp, signed int *lp,
const char *sym)
{
int nequiv = num_equivs(h, k, l, sym);
int p;
SYM_DEBUG("------ %i %i %i\n", h, k, l);
for ( p=0; p<nequiv; p++ ) {
signed int he, ke, le;
get_equiv(h, k, l, &he, &ke, &le, sym, p);
SYM_DEBUG("%i : %i %i %i\n", p, he, ke, le);
CHECK_COND(he, ke, le, sym);
}
/* Should never reach here */
ERROR("No match found in %s for %i %i %i\n", sym, h, k, l);
abort();
}
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