diff options
Diffstat (limited to 'boost/geometry/formulas/sjoberg_intersection.hpp')
| -rw-r--r-- | boost/geometry/formulas/sjoberg_intersection.hpp | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/boost/geometry/formulas/sjoberg_intersection.hpp b/boost/geometry/formulas/sjoberg_intersection.hpp index 54478e3062..723c42f2c0 100644 --- a/boost/geometry/formulas/sjoberg_intersection.hpp +++ b/boost/geometry/formulas/sjoberg_intersection.hpp @@ -864,6 +864,8 @@ private: // In this case sin_beta/sqrt_1_Cj_sqr and t/t0j is not in [-1, 1] // 3. f1-f2 may be 0 which means that the intermediate point is on the vertex // In this case it's not possible to check if this is the correct result + // 4. f1-f2 may also be 0 in other cases, e.g. + // geodesics are symetrical wrt equator and longitude directions are different CT const dbeta_denom = f1 - f2; //CT const dbeta_denom = math::abs(f1) + math::abs(f2); @@ -1172,6 +1174,7 @@ private: geodesic_type const& geod1, geodesic_type const& geod2, CT & t1, CT& t2) { + CT const c0 = 0; CT const c1 = 1; CT const c2 = 2; @@ -1196,8 +1199,8 @@ private: CT const K_t01_t02 = K * geod1.t0j * geod2.t0j; CT const D1 = math::sqrt(A + B); CT const D2 = math::sqrt(A - B); - CT const t_new1 = K_t01_t02 / D1; - CT const t_new2 = K_t01_t02 / D2; + CT const t_new1 = math::equals(D1, c0) ? c0 : K_t01_t02 / D1; + CT const t_new2 = math::equals(D2, c0) ? c0 : K_t01_t02 / D2; CT const t_new3 = -t_new1; CT const t_new4 = -t_new2; |