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101 lines
3.9 KiB
C
101 lines
3.9 KiB
C
/**********************************************************************
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* $Id$
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*
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* PostGIS - Spatial Types for PostgreSQL
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* Copyright 2009 Paul Ramsey <pramsey@cleverelephant.ca>
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*
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* This is free software; you can redistribute and/or modify it under
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* the terms of the GNU General Public Licence. See the COPYING file.
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*
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**********************************************************************/
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#include <math.h>
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#include "libgeom.h"
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extern int gbox_geocentric_slow;
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#define POW2(x) ((x)*(x))
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/**
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* Point in spherical coordinates on the world. Units of radians.
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*/
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typedef struct
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{
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double lon;
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double lat;
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} GEOGRAPHIC_POINT;
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/**
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* Two-point great circle segment from a to b.
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*/
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typedef struct
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{
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GEOGRAPHIC_POINT start;
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GEOGRAPHIC_POINT end;
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} GEOGRAPHIC_EDGE;
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/**
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* Holder for sorting points in distance algorithm
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*/
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typedef struct
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{
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double measure;
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uint32 index;
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} DISTANCE_ORDER;
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/**
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* Conversion functions
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*/
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#define deg2rad(d) (PI * (d) / 180.0)
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#define rad2deg(r) (180.0 * (r) / PI)
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/**
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* Ape a java function
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*/
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#define signum(a) ((a) < 0 ? -1 : ((a) > 0 ? 1 : (a)))
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/*
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** Prototypes for internal functions.
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*/
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void geog2cart(const GEOGRAPHIC_POINT *g, POINT3D *p);
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void cart2geog(const POINT3D *p, GEOGRAPHIC_POINT *g);
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void robust_cross_product(const GEOGRAPHIC_POINT *p, const GEOGRAPHIC_POINT *q, POINT3D *a);
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void x_to_z(POINT3D *p);
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void y_to_z(POINT3D *p);
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int edge_point_on_plane(const GEOGRAPHIC_EDGE *e, const GEOGRAPHIC_POINT *p);
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int edge_point_in_cone(const GEOGRAPHIC_EDGE *e, const GEOGRAPHIC_POINT *p);
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int edge_contains_coplanar_point(const GEOGRAPHIC_EDGE *e, const GEOGRAPHIC_POINT *p);
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int edge_contains_point(const GEOGRAPHIC_EDGE *e, const GEOGRAPHIC_POINT *p);
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double z_to_latitude(double z, int top);
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int clairaut_cartesian(const POINT3D *start, const POINT3D *end, GEOGRAPHIC_POINT *g_top, GEOGRAPHIC_POINT *g_bottom);
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int clairaut_geographic(const GEOGRAPHIC_POINT *start, const GEOGRAPHIC_POINT *end, GEOGRAPHIC_POINT *g_top, GEOGRAPHIC_POINT *g_bottom);
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double sphere_distance(const GEOGRAPHIC_POINT *s, const GEOGRAPHIC_POINT *e);
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double sphere_distance_cartesian(const POINT3D *s, const POINT3D *e);
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int sphere_project(const GEOGRAPHIC_POINT *r, double distance, double azimuth, GEOGRAPHIC_POINT *n);
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int edge_calculate_gbox(const GEOGRAPHIC_EDGE *e, GBOX *gbox);
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int edge_calculate_gbox_slow(const GEOGRAPHIC_EDGE *e, GBOX *gbox);
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int edge_intersection(const GEOGRAPHIC_EDGE *e1, const GEOGRAPHIC_EDGE *e2, GEOGRAPHIC_POINT *g);
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double edge_distance_to_point(const GEOGRAPHIC_EDGE *e, const GEOGRAPHIC_POINT *gp, GEOGRAPHIC_POINT *closest);
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double edge_distance_to_edge(const GEOGRAPHIC_EDGE *e1, const GEOGRAPHIC_EDGE *e2, GEOGRAPHIC_POINT *closest1, GEOGRAPHIC_POINT *closest2);
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void geographic_point_init(double lon, double lat, GEOGRAPHIC_POINT *g);
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int ptarray_point_in_ring_winding(const POINTARRAY *pa, const POINT2D *pt_to_test);
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int lwpoly_covers_point2d(const LWPOLY *poly, const GBOX *gbox, const POINT2D *pt_to_test);
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int ptarray_point_in_ring(const POINTARRAY *pa, const POINT2D *pt_outside, const POINT2D *pt_to_test);
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double ptarray_area_sphere(const POINTARRAY *pa, const POINT2D *pt_outside);
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double latitude_degrees_normalize(double lat);
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double longitude_degrees_normalize(double lon);
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double ptarray_length_spheroid(const POINTARRAY *pa, const SPHEROID *s);
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int geographic_point_equals(const GEOGRAPHIC_POINT *g1, const GEOGRAPHIC_POINT *g2);
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int crosses_dateline(const GEOGRAPHIC_POINT *s, const GEOGRAPHIC_POINT *e);
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void point_shift(GEOGRAPHIC_POINT *p, double shift);
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double longitude_radians_normalize(double lon);
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double latitude_radians_normalize(double lat);
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/*
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** Prototypes for spheroid functions.
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*/
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double spheroid_distance(const GEOGRAPHIC_POINT *a, const GEOGRAPHIC_POINT *b, const SPHEROID *spheroid);
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double spheroid_direction(const GEOGRAPHIC_POINT *r, const GEOGRAPHIC_POINT *s, const SPHEROID *spheroid);
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int spheroid_project(const GEOGRAPHIC_POINT *r, const SPHEROID *spheroid, double distance, double azimuth, GEOGRAPHIC_POINT *g);
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