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g_shear.c
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Sun, Dec 29, 08:42

g_shear.c
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#include<stdio.h>
#include<math.h>
#include<fonction.h>
#include<constant.h>
#include<dimension.h>
#include<structure.h>
#include<lt.h>
/****************************************************************/
/* nom: g_shear */
/* auteur: Jean-Paul Kneib */
/* date: 10/02/92 */
/* place: Toulouse */
/****************************************************************/
void g_shear(int ishear, int np, double z, char *file)
{
const extern struct g_mode M;
const extern struct g_frame F;
const extern struct pot lens[];
register int i, j, ii, jj;
double q, conv;
double dl0s, dos, dlsds;
struct point ps, pi;
struct ellipse ampli;
double **shear;
int **nsh;
struct matrix grad2;
double dx, dy, xmin, xmax, ymin, ymax;
if (ishear == 1)
{
NPRINTF(stderr, "COMP:shear_map (gamma) in the Image Plane for z_s=%.3lf =>%s\n", z, file);
}
else if (ishear == 2)
{
NPRINTF(stderr, "COMP:shear_map (eps) in the Image Plane for z_s=%.3lf=>%s\n",
z, file);
}
else if (ishear == 3)
{
NPRINTF(stderr, "COMP:shear_map (gamma1) in the Image Plane for z_s=%.3lf=>%s\n",
z, file);
}
else if (ishear == 4)
{
NPRINTF(stderr, "COMP:shear_map (gamma2) in the Image Plane for z_s=%.3lf=>%s\n",
z, file);
}
else if (ishear == -1)
{
NPRINTF(stderr, "COMP:shear_map (gamma) in the Source Plane for z_s=%.3lf =>%s\n",
z, file);
}
else if (ishear == -2)
{
NPRINTF(stderr, "COMP:shear_map (eps) in the Source Plane for z_s=%.3lf =>%s\n",
z, file);
}
dl0s = distcosmo2( lens[0].z, z );
dos = distcosmo1( z );
dlsds = dl0s / dos;
shear = (double **) alloc_square_double(np, np);
nsh = (int **) alloc_square_int(np, np);
// Compute the shear at the positions in the image plane
if (ishear > 0)
{
xmin = F.xmin;
xmax = F.xmax;
ymin = F.ymin;
ymax = F.ymax;
// Compute a shear map
if ( ishear == 1 )
{
for (j = 0; j < np; j++)
{
pi.y = j * (ymax - ymin) / (np - 1) + ymin;
for (i = 0; i < np; i++)
{
pi.x = i * (xmax - xmin) / (np - 1) + xmin;
ampli = e_unmag(&pi, dl0s, dos, z);
shear[j][i] = (ampli.a - ampli.b) / 2.;
}
}
}
// Compute an ellipticity map
else if ( ishear == 2 )
{
for (j = 0; j < np; j++)
{
pi.y = j * (ymax - ymin) / (np - 1) + ymin;
for (i = 0; i < np; i++)
{
pi.x = i * (xmax - xmin) / (np - 1) + xmin;
ampli = e_unmag(&pi, dl0s, dos, z);
q = ampli.a / ampli.b;
shear[j][i] = fabs((q * q - 1.) / (q * q + 1.));
}
}
}
// Compute the gamma1 shear component
else if ( ishear == 3 )
{
//conv = vol * vol / 4.*distcosmo1(lens[0].z) * dlsds;
//conv = dlsds / 2.;
conv = 1./ dos / 2.;
for (j = 0; j < np; j++)
{
pi.y = j * (ymax - ymin) / (np - 1) + ymin;
for (i = 0; i < np; i++)
{
pi.x = i * (xmax - xmin) / (np - 1) + xmin;
grad2 = e_grad2(&pi, dl0s, z);
shear[j][i] = conv * (grad2.a - grad2.c);
}
}
}
// Compute the gamma2 shear component
else if ( ishear == 4 )
{
//conv = vol * vol / 4.*distcosmo1(lens[0].z) * dlsds;
//conv = dlsds;
conv = 1. / dos;
for (j = 0; j < np; j++)
{
pi.y = j * (ymax - ymin) / (np - 1) + ymin;
for (i = 0; i < np; i++)
{
pi.x = i * (xmax - xmin) / (np - 1) + xmin;
grad2 = e_grad2(&pi, dl0s, z);
shear[j][i] = conv * grad2.b;
}
}
}
}
else
// Compute the shear at the positions in the source plane
// (what will be felt by each pixel of the source plane)
{
dx = (F.xmax - F.xmin) / 6.;
dy = (F.ymax - F.ymin) / 6.;
xmin = F.xmin + dx; /*define a smaller window in the Source plane*/
xmax = F.xmax - dx;
ymin = F.ymin + dy;
ymax = F.ymax - dy;
dx = (xmax - xmin) / (np - 1);
dy = (ymax - ymin) / (np - 1);
for (j = 0; j < (np*1.8); j++)
{
pi.y = j * (F.ymax - F.ymin) / (np * 1.8 - 1) + F.ymin;
for (i = 0; i < (np*1.8); i++)
{
pi.x = i * (F.xmax - F.xmin) / (np * 1.8 - 1) + F.xmin;
ampli = e_unmag(&pi, dl0s, dos, z);
e_dpl(&pi, dlsds, &ps);
ii = (int) (0.5 + (ps.x - xmin) / dx);
jj = (int) (0.5 + (ps.y - ymin) / dy);
if ((ii >= 0) && (ii < np) && (jj >= 0) && (jj < np))
{
if ( ishear == -1)
shear[jj][ii] += (ampli.a - ampli.b) / 2.;
else if ( ishear == -2)
{
q = ampli.a / ampli.b;
shear[jj][ii] += fabs((q * q - 1.) / (q * q + 1.));
}
nsh[jj][ii]++;
}
}
}
for (ii = 0; ii < np; ii++)
for (jj = 0; jj < np; jj++)
if (nsh[jj][ii] > 0)
shear[jj][ii] /= nsh[jj][ii];
}
if (M.iref > 0)
wrf_fits_abs(file, shear, np, np, xmin, xmax, ymin, ymax, M.ref_ra, M.ref_dec);
else
wrf_fits(file, shear, np, np, xmin, xmax, ymin, ymax);
free_square_double(shear, np);
free_square_int(nsh, np);
}

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