lwgeodetic.h File Reference
#include <math.h>
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Data Structures | |
| struct | GEOGRAPHIC_POINT |
| Point in spherical coordinates on the world. More... | |
| struct | GEOGRAPHIC_EDGE |
| Two-point great circle segment from a to b. More... | |
| struct | DISTANCE_ORDER |
| Holder for sorting points in distance algorithm. More... | |
Macros | |
| #define | _GNU_SOURCE |
| #define | NAN 0.0/0.0 |
| #define | POW2(x) ((x)*(x)) |
| #define | deg2rad(d) (M_PI * (d) / 180.0) |
| Conversion functions. More... | |
| #define | rad2deg(r) (180.0 * (r) / M_PI) |
| #define | PIR_NO_INTERACT 0x00 |
| Bitmask elements for edge_intersects() return value. More... | |
| #define | PIR_INTERSECTS 0x01 |
| #define | PIR_COLINEAR 0x02 |
| #define | PIR_A_TOUCH_RIGHT 0x04 |
| #define | PIR_A_TOUCH_LEFT 0x08 |
| #define | PIR_B_TOUCH_RIGHT 0x10 |
| #define | PIR_B_TOUCH_LEFT 0x20 |
Functions | |
| void | geog2cart (const GEOGRAPHIC_POINT *g, POINT3D *p) |
| Convert spherical coordinates to cartesion coordinates on unit sphere. More... | |
| void | cart2geog (const POINT3D *p, GEOGRAPHIC_POINT *g) |
| Convert cartesion coordinates on unit sphere to spherical coordinates. More... | |
| void | robust_cross_product (const GEOGRAPHIC_POINT *p, const GEOGRAPHIC_POINT *q, POINT3D *a) |
| Computes the cross product of two vectors using their lat, lng representations. More... | |
| void | x_to_z (POINT3D *p) |
| void | y_to_z (POINT3D *p) |
| int | edge_point_on_plane (const GEOGRAPHIC_EDGE *e, const GEOGRAPHIC_POINT *p) |
| Returns true if the point p is on the great circle plane. More... | |
| int | edge_point_in_cone (const GEOGRAPHIC_EDGE *e, const GEOGRAPHIC_POINT *p) |
| Returns true if the point p is inside the cone defined by the two ends of the edge e. More... | |
| int | edge_contains_coplanar_point (const GEOGRAPHIC_EDGE *e, const GEOGRAPHIC_POINT *p) |
| True if the longitude of p is within the range of the longitude of the ends of e. More... | |
| int | edge_contains_point (const GEOGRAPHIC_EDGE *e, const GEOGRAPHIC_POINT *p) |
| Returns true if the point p is on the minor edge defined by the end points of e. More... | |
| double | z_to_latitude (double z, int top) |
| Used in great circle to compute the pole of the great circle. More... | |
| int | clairaut_cartesian (const POINT3D *start, const POINT3D *end, GEOGRAPHIC_POINT *g_top, GEOGRAPHIC_POINT *g_bottom) |
| Computes the pole of the great circle disk which is the intersection of the great circle with the line of maximum/minimum gradiant that lies on the great circle plane. More... | |
| int | clairaut_geographic (const GEOGRAPHIC_POINT *start, const GEOGRAPHIC_POINT *end, GEOGRAPHIC_POINT *g_top, GEOGRAPHIC_POINT *g_bottom) |
| Computes the pole of the great circle disk which is the intersection of the great circle with the line of maximum/minimum gradiant that lies on the great circle plane. More... | |
| double | sphere_distance (const GEOGRAPHIC_POINT *s, const GEOGRAPHIC_POINT *e) |
| Given two points on a unit sphere, calculate their distance apart in radians. More... | |
| double | sphere_distance_cartesian (const POINT3D *s, const POINT3D *e) |
| Given two unit vectors, calculate their distance apart in radians. More... | |
| int | sphere_project (const GEOGRAPHIC_POINT *r, double distance, double azimuth, GEOGRAPHIC_POINT *n) |
| Given a starting location r, a distance and an azimuth to the new point, compute the location of the projected point on the unit sphere. More... | |
| int | edge_calculate_gbox_slow (const GEOGRAPHIC_EDGE *e, GBOX *gbox) |
| int | edge_calculate_gbox (const POINT3D *A1, const POINT3D *A2, GBOX *gbox) |
| The magic function, given an edge in spherical coordinates, calculate a 3D bounding box that fully contains it, taking into account the curvature of the sphere on which it is inscribed. More... | |
| int | edge_intersection (const GEOGRAPHIC_EDGE *e1, const GEOGRAPHIC_EDGE *e2, GEOGRAPHIC_POINT *g) |
| Returns true if an intersection can be calculated, and places it in *g. More... | |
| int | edge_intersects (const POINT3D *A1, const POINT3D *A2, const POINT3D *B1, const POINT3D *B2) |
| Returns non-zero if edges A and B interact. More... | |
| double | edge_distance_to_point (const GEOGRAPHIC_EDGE *e, const GEOGRAPHIC_POINT *gp, GEOGRAPHIC_POINT *closest) |
| double | edge_distance_to_edge (const GEOGRAPHIC_EDGE *e1, const GEOGRAPHIC_EDGE *e2, GEOGRAPHIC_POINT *closest1, GEOGRAPHIC_POINT *closest2) |
| Calculate the distance between two edges. More... | |
| void | geographic_point_init (double lon, double lat, GEOGRAPHIC_POINT *g) |
| Initialize a geographic point. More... | |
| int | ptarray_contains_point_sphere (const POINTARRAY *pa, const POINT2D *pt_outside, const POINT2D *pt_to_test) |
| This routine returns LW_TRUE if the stabline joining the pt_outside and pt_to_test crosses the ring an odd number of times, or if the pt_to_test is on the ring boundary itself, returning LW_FALSE otherwise. More... | |
| int | lwpoly_covers_point2d (const LWPOLY *poly, const POINT2D *pt_to_test) |
| Given a polygon (lon/lat decimal degrees) and point (lon/lat decimal degrees) and a guaranteed outside point (lon/lat decimal degrees) (calculate with gbox_pt_outside()) return LW_TRUE if point is inside or on edge of polygon. More... | |
| int | lwpoly_covers_lwpoly (const LWPOLY *lwpoly1, const LWPOLY *lwpoly2) |
| Given a polygon1 check if all points of polygon2 are inside polygon1 and no intersections of the polygon edges occur. More... | |
| int | lwpoly_covers_pointarray (const LWPOLY *lwpoly, const POINTARRAY *pta) |
| return LW_TRUE if all points are inside the polygon More... | |
| int | lwpoly_covers_lwline (const LWPOLY *poly, const LWLINE *line) |
| int | lwline_covers_lwline (const LWLINE *lwline1, const LWLINE *lwline2) |
| Check if first and last point of line2 are covered by line1 and then each point in between has to be one line1 in the exact same order return LW_TRUE if all edge points of line2 are on line1. More... | |
| int | lwline_covers_lwpoint (const LWLINE *lwline, const LWPOINT *lwpoint) |
| return LW_TRUE if any of the line segments covers the point More... | |
| int | lwpoly_intersects_line (const LWPOLY *lwpoly, const POINTARRAY *line) |
| Checks if any edges of lwpoly intersect with the line formed by the pointarray return LW_TRUE if any intersection beetween the given polygon and the line. More... | |
| int | lwpoly_pt_outside (const LWPOLY *poly, POINT2D *pt_outside) |
| int | ptarray_point_in_ring (const POINTARRAY *pa, const POINT2D *pt_outside, const POINT2D *pt_to_test) |
| double | ptarray_area_sphere (const POINTARRAY *pa) |
| Returns the area of the ring (ring must be closed) in square radians (surface of the sphere is 4*PI). More... | |
| double | latitude_degrees_normalize (double lat) |
| Convert a latitude to the range of -90,90. More... | |
| double | longitude_degrees_normalize (double lon) |
| Convert a longitude to the range of -180,180. More... | |
| double | ptarray_length_spheroid (const POINTARRAY *pa, const SPHEROID *s) |
| int | geographic_point_equals (const GEOGRAPHIC_POINT *g1, const GEOGRAPHIC_POINT *g2) |
| int | crosses_dateline (const GEOGRAPHIC_POINT *s, const GEOGRAPHIC_POINT *e) |
| void | point_shift (GEOGRAPHIC_POINT *p, double shift) |
| Shift a point around by a number of radians. More... | |
| double | longitude_radians_normalize (double lon) |
| Convert a longitude to the range of -PI,PI. More... | |
| double | latitude_radians_normalize (double lat) |
| Convert a latitude to the range of -PI/2,PI/2. More... | |
| void | vector_sum (const POINT3D *a, const POINT3D *b, POINT3D *n) |
| Calculate the sum of two vectors. More... | |
| void | vector_scale (POINT3D *a, double s) |
| Scale a vector out by a factor. More... | |
| double | vector_angle (const POINT3D *v1, const POINT3D *v2) |
| Angle between two unit vectors. More... | |
| void | vector_rotate (const POINT3D *v1, const POINT3D *v2, double angle, POINT3D *n) |
| Rotates v1 through an angle (in radians) within the plane defined by v1/v2, returns the rotated vector in n. More... | |
| void | normalize (POINT3D *p) |
| Normalize to a unit vector. More... | |
| void | unit_normal (const POINT3D *P1, const POINT3D *P2, POINT3D *normal) |
| Calculates the unit normal to two vectors, trying to avoid problems with over-narrow or over-wide cases. More... | |
| double | sphere_direction (const GEOGRAPHIC_POINT *s, const GEOGRAPHIC_POINT *e, double d) |
| Given two points on a unit sphere, calculate the direction from s to e. More... | |
| void | ll2cart (const POINT2D *g, POINT3D *p) |
| Convert lon/lat coordinates to cartesion coordinates on unit sphere. More... | |
| double | spheroid_distance (const GEOGRAPHIC_POINT *a, const GEOGRAPHIC_POINT *b, const SPHEROID *spheroid) |
| Computes the shortest distance along the surface of the spheroid between two points. More... | |
| double | spheroid_direction (const GEOGRAPHIC_POINT *r, const GEOGRAPHIC_POINT *s, const SPHEROID *spheroid) |
| Computes the direction of the geodesic joining two points on the spheroid. More... | |
| int | spheroid_project (const GEOGRAPHIC_POINT *r, const SPHEROID *spheroid, double distance, double azimuth, GEOGRAPHIC_POINT *g) |
| Given a location, an azimuth and a distance, computes the location of the projected point. More... | |
Variables | |
| int | gbox_geocentric_slow |
| For testing geodetic bounding box, we have a magic global variable. More... | |
