diff options
Diffstat (limited to 'navit/tools/gpx2navit_txt/src/geod_inv.c')
| -rw-r--r-- | navit/tools/gpx2navit_txt/src/geod_inv.c | 81 |
1 files changed, 40 insertions, 41 deletions
diff --git a/navit/tools/gpx2navit_txt/src/geod_inv.c b/navit/tools/gpx2navit_txt/src/geod_inv.c index a54128256..826f4e3fd 100644 --- a/navit/tools/gpx2navit_txt/src/geod_inv.c +++ b/navit/tools/gpx2navit_txt/src/geod_inv.c @@ -24,33 +24,32 @@ static const char SCCSID[] = # include "projects.h" # include "geodesic.h" # define DTOL 1e-12 -void geod_inv(void) -{ +void geod_inv(void) { double th1, - th2, - thm, - dthm, - dlamm, - dlam, - sindlamm, - costhm, - sinthm, - cosdthm, - sindthm, L, E, cosd, d, X, Y, T, sind, tandlammp, u, v, D, A, B; + th2, + thm, + dthm, + dlamm, + dlam, + sindlamm, + costhm, + sinthm, + cosdthm, + sindthm, L, E, cosd, d, X, Y, T, sind, tandlammp, u, v, D, A, B; if (ellipse) { - th1 = atan(onef * tan(phi1)); - th2 = atan(onef * tan(phi2)); + th1 = atan(onef * tan(phi1)); + th2 = atan(onef * tan(phi2)); } else { - th1 = phi1; - th2 = phi2; + th1 = phi1; + th2 = phi2; } thm = .5 * (th1 + th2); dthm = .5 * (th2 - th1); dlamm = .5 * (dlam = adjlon(lam2 - lam1)); if (fabs(dlam) < DTOL && fabs(dthm) < DTOL) { - al12 = al21 = geod_S = 0.; - return; + al12 = al21 = geod_S = 0.; + return; } sindlamm = sin(dlamm); costhm = cos(thm); @@ -58,32 +57,32 @@ void geod_inv(void) cosdthm = cos(dthm); sindthm = sin(dthm); L = sindthm * sindthm + (cosdthm * cosdthm - sinthm * sinthm) - * sindlamm * sindlamm; + * sindlamm * sindlamm; d = acos(cosd = 1 - L - L); if (ellipse) { - E = cosd + cosd; - sind = sin(d); - Y = sinthm * cosdthm; - Y *= (Y + Y) / (1. - L); - T = sindthm * costhm; - T *= (T + T) / L; - X = Y + T; - Y -= T; - T = d / sind; - D = 4. * T * T; - A = D * E; - B = D + D; - geod_S = geod_a * sind * (T - f4 * (T * X - Y) + - f64 * (X * (A + (T - .5 * (A - E)) * X) - - Y * (B + E * Y) + D * X * Y)); - tandlammp = tan(.5 * (dlam - .25 * (Y + Y - E * (4. - X)) * - (f2 * T + f64 * (32. * T - (20. * T - A) - * X - (B + - 4.) * Y)) * - tan(dlam))); + E = cosd + cosd; + sind = sin(d); + Y = sinthm * cosdthm; + Y *= (Y + Y) / (1. - L); + T = sindthm * costhm; + T *= (T + T) / L; + X = Y + T; + Y -= T; + T = d / sind; + D = 4. * T * T; + A = D * E; + B = D + D; + geod_S = geod_a * sind * (T - f4 * (T * X - Y) + + f64 * (X * (A + (T - .5 * (A - E)) * X) - + Y * (B + E * Y) + D * X * Y)); + tandlammp = tan(.5 * (dlam - .25 * (Y + Y - E * (4. - X)) * + (f2 * T + f64 * (32. * T - (20. * T - A) + * X - (B + + 4.) * Y)) * + tan(dlam))); } else { - geod_S = geod_a * d; - tandlammp = tan(dlamm); + geod_S = geod_a * d; + tandlammp = tan(dlamm); } u = atan2(sindthm, (tandlammp * costhm)); v = atan2(cosdthm, (tandlammp * sinthm)); |