mirror of
https://git.osgeo.org/gitea/postgis/postgis
synced 2024-10-24 09:02:37 +00:00
53 lines
1.9 KiB
C
53 lines
1.9 KiB
C
/**********************************************************************
|
|
* $Id$
|
|
*
|
|
* PostGIS - Spatial Types for PostgreSQL
|
|
* http://postgis.refractions.net
|
|
* Copyright 2008 Paul Ramsey
|
|
*
|
|
* This is free software; you can redistribute and/or modify it under
|
|
* the terms of the GNU General Public Licence. See the COPYING file.
|
|
*
|
|
**********************************************************************/
|
|
|
|
#include <math.h>
|
|
#include "liblwgeom_internal.h"
|
|
|
|
enum CG_SEGMENT_INTERSECTION_TYPE {
|
|
SEG_ERROR = -1,
|
|
SEG_NO_INTERSECTION = 0,
|
|
SEG_COLINEAR = 1,
|
|
SEG_CROSS_LEFT = 2,
|
|
SEG_CROSS_RIGHT = 3,
|
|
SEG_TOUCH_LEFT = 4,
|
|
SEG_TOUCH_RIGHT = 5
|
|
};
|
|
|
|
double lw_segment_side(const POINT2D *p1, const POINT2D *p2, const POINT2D *q);
|
|
int lw_segment_intersects(const POINT2D *p1, const POINT2D *p2, const POINT2D *q1, const POINT2D *q2);
|
|
int lw_segment_envelope_intersects(const POINT2D *p1, const POINT2D *p2, const POINT2D *q1, const POINT2D *q2);
|
|
|
|
|
|
enum CG_LINE_CROSS_TYPE {
|
|
LINE_NO_CROSS = 0,
|
|
LINE_CROSS_LEFT = -1,
|
|
LINE_CROSS_RIGHT = 1,
|
|
LINE_MULTICROSS_END_LEFT = -2,
|
|
LINE_MULTICROSS_END_RIGHT = 2,
|
|
LINE_MULTICROSS_END_SAME_FIRST_LEFT = -3,
|
|
LINE_MULTICROSS_END_SAME_FIRST_RIGHT = 3
|
|
};
|
|
|
|
int lwline_crossing_direction(LWLINE *l1, LWLINE *l2);
|
|
|
|
double lwpoint_get_ordinate(const POINT4D *p, int ordinate);
|
|
void lwpoint_set_ordinate(POINT4D *p, int ordinate, double value);
|
|
int lwpoint_interpolate(const POINT4D *p1, const POINT4D *p2, POINT4D *p, int ndims, int ordinate, double interpolation_value);
|
|
LWCOLLECTION *lwline_clip_to_ordinate_range(LWLINE *line, int ordinate, double from, double to);
|
|
LWCOLLECTION *lwmline_clip_to_ordinate_range(LWMLINE *mline, int ordinate, double from, double to);
|
|
|
|
int lwgeom_geohash_precision(BOX3D bbox, BOX3D *bounds);
|
|
char *lwgeom_geohash(const LWGEOM *lwgeom, int precision);
|
|
char *geohash_point(double longitude, double latitude, int precision);
|
|
|