/* See {hr2_pmap_opt_translation.h}. */
/* Last edited on 2024-09-05 19:17:20 by stolfi */

#define _GNU_SOURCE
#include <stdint.h>
#include <assert.h>
#include <math.h>
 
#include <bool.h>
#include <r2.h>
#include <affirm.h>

#include <hr2_pmap_opt_translation.h>

void hr2_pmap_encode_translation(hr2_pmap_t *M, double y[])
  {
    double A00 = M->dir.c[0][0];
    y[0] = M->dir.c[0][1] / A00;
    y[1] = M->dir.c[0][2] / A00;
    return;
  }

void hr2_pmap_decode_translation(double y[], hr2_pmap_t *M)
  { 
    r3x3_ident(&(M->dir));
    M->dir.c[0][1] = y[0];
    M->dir.c[0][2] = y[1];

    r3x3_ident(&(M->inv));
    M->inv.c[0][1] = - y[0];
    M->inv.c[0][2] = - y[1];

    return;
  }