diff options
Diffstat (limited to 'src/3rdparty/proj/PJ_chamb.c')
| -rw-r--r-- | src/3rdparty/proj/PJ_chamb.c | 112 |
1 files changed, 0 insertions, 112 deletions
diff --git a/src/3rdparty/proj/PJ_chamb.c b/src/3rdparty/proj/PJ_chamb.c deleted file mode 100644 index c17a7133..00000000 --- a/src/3rdparty/proj/PJ_chamb.c +++ /dev/null @@ -1,112 +0,0 @@ -typedef struct { double r, Az; } VECT; -#define PROJ_PARMS__ \ - struct { /* control point data */ \ - double phi, lam; \ - double cosphi, sinphi; \ - VECT v; \ - XY p; \ - double Az; \ - } c[3]; \ - XY p; \ - double beta_0, beta_1, beta_2; -#define PJ_LIB__ -#include <projects.h> -PROJ_HEAD(chamb, "Chamberlin Trimetric") "\n\tMisc Sph, no inv." -"\n\tlat_1= lon_1= lat_2= lon_2= lat_3= lon_3="; -#include <stdio.h> -#define THIRD 0.333333333333333333 -#define TOL 1e-9 - static VECT /* distance and azimuth from point 1 to point 2 */ -vect(double dphi, double c1, double s1, double c2, double s2, double dlam) { - VECT v; - double cdl, dp, dl; - - cdl = cos(dlam); - if (fabs(dphi) > 1. || fabs(dlam) > 1.) - v.r = aacos(s1 * s2 + c1 * c2 * cdl); - else { /* more accurate for smaller distances */ - dp = sin(.5 * dphi); - dl = sin(.5 * dlam); - v.r = 2. * aasin(sqrt(dp * dp + c1 * c2 * dl * dl)); - } - if (fabs(v.r) > TOL) - v.Az = atan2(c2 * sin(dlam), c1 * s2 - s1 * c2 * cdl); - else - v.r = v.Az = 0.; - return v; -} - static double /* law of cosines */ -lc(double b,double c,double a) { - return aacos(.5 * (b * b + c * c - a * a) / (b * c)); -} -FORWARD(s_forward); /* spheroid */ - double sinphi, cosphi, a; - VECT v[3]; - int i, j; - - sinphi = sin(lp.phi); - cosphi = cos(lp.phi); - for (i = 0; i < 3; ++i) { /* dist/azimiths from control */ - v[i] = vect(lp.phi - P->c[i].phi, P->c[i].cosphi, P->c[i].sinphi, - cosphi, sinphi, lp.lam - P->c[i].lam); - if ( ! v[i].r) - break; - v[i].Az = adjlon(v[i].Az - P->c[i].v.Az); - } - if (i < 3) /* current point at control point */ - xy = P->c[i].p; - else { /* point mean of intersepts */ - xy = P->p; - for (i = 0; i < 3; ++i) { - j = i == 2 ? 0 : i + 1; - a = lc(P->c[i].v.r, v[i].r, v[j].r); - if (v[i].Az < 0.) - a = -a; - if (! i) { /* coord comp unique to each arc */ - xy.x += v[i].r * cos(a); - xy.y -= v[i].r * sin(a); - } else if (i == 1) { - a = P->beta_1 - a; - xy.x -= v[i].r * cos(a); - xy.y -= v[i].r * sin(a); - } else { - a = P->beta_2 - a; - xy.x += v[i].r * cos(a); - xy.y += v[i].r * sin(a); - } - } - xy.x *= THIRD; /* mean of arc intercepts */ - xy.y *= THIRD; - } - return xy; -} -FREEUP; if (P) pj_dalloc(P); } -ENTRY0(chamb) - int i, j; - char line[10]; - - for (i = 0; i < 3; ++i) { /* get control point locations */ - (void)sprintf(line, "rlat_%d", i+1); - P->c[i].phi = pj_param(P->params, line).f; - (void)sprintf(line, "rlon_%d", i+1); - P->c[i].lam = pj_param(P->params, line).f; - P->c[i].lam = adjlon(P->c[i].lam - P->lam0); - P->c[i].cosphi = cos(P->c[i].phi); - P->c[i].sinphi = sin(P->c[i].phi); - } - for (i = 0; i < 3; ++i) { /* inter ctl pt. distances and azimuths */ - j = i == 2 ? 0 : i + 1; - P->c[i].v = vect(P->c[j].phi - P->c[i].phi, P->c[i].cosphi, P->c[i].sinphi, - P->c[j].cosphi, P->c[j].sinphi, P->c[j].lam - P->c[i].lam); - if (! P->c[i].v.r) E_ERROR(-25); - /* co-linearity problem ignored for now */ - } - P->beta_0 = lc(P->c[0].v.r, P->c[2].v.r, P->c[1].v.r); - P->beta_1 = lc(P->c[0].v.r, P->c[1].v.r, P->c[2].v.r); - P->beta_2 = PI - P->beta_0; - P->p.y = 2. * (P->c[0].p.y = P->c[1].p.y = P->c[2].v.r * sin(P->beta_0)); - P->c[2].p.y = 0.; - P->c[0].p.x = - (P->c[1].p.x = 0.5 * P->c[0].v.r); - P->p.x = P->c[2].p.x = P->c[0].p.x + P->c[2].v.r * cos(P->beta_0); - P->es = 0.; P->fwd = s_forward; -ENDENTRY(P) |