lwgeom_generate_grid.c File Reference

#include "postgres.h"
#include "fmgr.h"
#include "funcapi.h"
#include "access/htup_details.h"
#include "../postgis_config.h"
#include "lwgeom_pg.h"
#include "liblwgeom.h"
#include <math.h>
#include <float.h>
#include <string.h>
#include <stdio.h>

Include dependency graph for lwgeom_generate_grid.c:

Go to the source code of this file.

Data Structures
struct	GeometryGridState
struct	HexagonGridState
struct	SquareGridState

Macros
#define	H   0.8660254037844387

Typedefs
typedef struct GeometryGridState	GeometryGridState
typedef struct HexagonGridState	HexagonGridState
typedef struct SquareGridState	SquareGridState

Enumerations
enum	GeometryShape { SHAPE_SQUARE , SHAPE_HEXAGON , SHAPE_TRIANGLE }

Functions
Datum	ST_Hexagon (PG_FUNCTION_ARGS)
Datum	ST_Square (PG_FUNCTION_ARGS)
Datum	ST_ShapeGrid (PG_FUNCTION_ARGS)
static LWGEOM *	hexagon (double origin_x, double origin_y, double size, int cell_i, int cell_j, int32_t srid)
static HexagonGridState *	hexagon_grid_state (double size, const GBOX *gbox, int32_t srid)
static void	hexagon_state_next (HexagonGridState *state)
static LWGEOM *	square (double origin_x, double origin_y, double size, int cell_i, int cell_j, int32_t srid)
static SquareGridState *	square_grid_state (double size, const GBOX *gbox, int32_t srid)
static void	square_state_next (SquareGridState *state)
	PG_FUNCTION_INFO_V1 (ST_ShapeGrid)
	ST_HexagonGrid(size float8, bounds geometry) ST_SquareGrid(size float8, bounds geometry) More...
	PG_FUNCTION_INFO_V1 (ST_Hexagon)
	ST_Hexagon(size double, cell_i integer default 0, cell_j integer default 0, origin geometry default 'POINT(0 0)') More...
	PG_FUNCTION_INFO_V1 (ST_Square)
	ST_Square(size double, cell_i integer, cell_j integer, origin geometry default 'POINT(0 0)') More...

Variables
static const double	hex_x [] = {-1.0, -0.5, 0.5, 1.0, 0.5, -0.5, -1.0}
static const double	hex_y [] = {0.0, -0.5, -0.5, 0.0, 0.5, 0.5, 0.0}