void makedisk(bool randspin)
{
int i;
bodyptr bp;
double m, r, v, phi;
matrix xmat, zmat;
vector tmpv;
for (i = 0; i < ndisk; i++) { // loop initializing bodies
bp = NthBody(disk, i); // set ptr to body number i
m = mdtab[NTAB-1] * ((double) i + 0.5) / ndisk;
r = gsl_interp_eval(rm_spline, mdtab, rdtab, m, NULL);
v = gsl_interp_eval(vr_spline, rdtab, vctab, r, NULL);
phi = xrandom(0.0, 2 * M_PI);
Pos(bp)[0] = r * sin(phi);
Pos(bp)[1] = r * cos(phi);
Pos(bp)[2] = 0.0;
Vel(bp)[0] = v * cos(phi);
Vel(bp)[1] = - v * sin(phi);
Vel(bp)[2] = 0.0;
pickshell(AuxVec(bp), NDIM, 1.0);
if (randspin) {
xmatrix(xmat, acos(AuxVec(bp)[2]));
zmatrix(zmat, atan2(AuxVec(bp)[0], AuxVec(bp)[1]));
MULMV(tmpv, xmat, Pos(bp));
MULMV(Pos(bp), zmat, tmpv);
MULMV(tmpv, xmat, Vel(bp));
MULMV(Vel(bp), zmat, tmpv);
}
}
}
void rotate(snapshot *snap, string *tags, string *vecs, char axis,
real thetax, real thetay, real thetaz)
{
matrix rmat;
bodyptr bp;
switch (tolower(axis)) {
case 'x':
xmatrix(rmat, thetax);
break;
case 'y':
ymatrix(rmat, thetay);
break;
case 'z':
zmatrix(rmat, thetaz);
break;
default:
error("%s: unknown axis %c\n", getargv0(), axis);
}
if (set_member(tags, PosTag) && set_member(vecs, PosTag))
for_all_bodies(bp, *snap)
rotatevec(Pos(bp), rmat);
if (set_member(tags, VelTag) && set_member(vecs, VelTag))
for_all_bodies(bp, *snap)
rotatevec(Vel(bp), rmat);
if (set_member(tags, AccTag) && set_member(vecs, AccTag))
for_all_bodies(bp, *snap)
rotatevec(Acc(bp), rmat);
if (set_member(tags, AuxVecTag) && set_member(vecs, AuxVecTag))
for_all_bodies(bp, *snap)
rotatevec(AuxVec(bp), rmat);
}
