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https://git.osgeo.org/gitea/postgis/postgis
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6c0c071607
git-svn-id: http://svn.osgeo.org/postgis/trunk@902 b70326c6-7e19-0410-871a-916f4a2858ee
787 lines
27 KiB
C
787 lines
27 KiB
C
//lwgeom.h
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// basic API for handling the LWGEOM, BOX2DFLOAT4, LWPOINT, LWLINE, and LWPOLY.
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// See below for other support types like POINTARRAY and LWGEOM_INSPECTED
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#include <sys/types.h>
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#include "utils/geo_decls.h"
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typedef struct
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{
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float xmin;
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float ymin;
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float xmax;
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float ymax;
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} BOX2DFLOAT4;
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typedef struct
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{
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double xmin, ymin, zmin;
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double xmax, ymax, zmax;
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} BOX3D;
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typedef struct chiptag
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{
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int size; //unused (for use by postgresql)
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int endian_hint; // the number 1 in the endian of this datastruct
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BOX3D bvol;
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int SRID;
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char future[4];
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float factor; // Usually 1.0.
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// Integer values are multiplied by this number
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// to get the actual height value
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// (for sub-meter accuracy height data).
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int datatype; // 1 = float32,
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// 5 = 24bit integer,
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// 6 = 16bit integer (short)
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// 101 = float32 (NDR),
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// 105 = 24bit integer (NDR),
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// 106=16bit int (NDR)
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int height;
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int width;
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int compression; // 0 = no compression, 1 = differencer
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// 0x80 = new value
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// 0x7F = nodata
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// this is provided for convenience, it should be set to
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// sizeof(chip) bytes into the struct because the serialized form is:
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// <header><data>
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// NULL when serialized
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void *data; // data[0] = bottm left,
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// data[width] = 1st pixel, 2nd row (uncompressed)
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} CHIP;
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/*
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* standard definition of an ellipsoid (what wkt calls a spheroid)
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* f = (a-b)/a
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* e_sq = (a*a - b*b)/(a*a)
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* b = a - fa
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*/
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typedef struct
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{
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double a; //semimajor axis
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double b; //semiminor axis
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double f; //flattening
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double e; //eccentricity (first)
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double e_sq; //eccentricity (first), squared
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char name[20]; //name of ellipse
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} SPHEROID;
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// POINT3D already defined in postgis.h
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// ALL LWGEOM structures will use POINT3D as an abstract point.
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// This means a 2d geometry will be stored as (x,y) in its serialized
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// form, but all functions will work on (x,y,0). This keeps all the
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// analysis functions simple.
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// NOTE: for GEOS integration, we'll probably set z=NaN
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// so look out - z might be NaN for 2d geometries!
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typedef struct { double x,y,z; } POINT3D;
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// type for 2d points. When you convert this to 3d, the
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// z component will be either 0 or NaN.
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typedef struct
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{
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double x;
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double y;
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} POINT2D;
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typedef struct
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{
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double x;
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double y;
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double z;
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double m;
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} POINT4D;
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// Point array abstracts a lot of the complexity of points and point lists.
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// It handles miss-alignment in the serialized form, 2d/3d translation
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// (2d points converted to 3d will have z=0 or NaN)
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// DONT MIX 2D and 3D POINTS! *EVERYTHING* is either one or the other
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typedef struct
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{
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char *serialized_pointlist; // array of POINT 2D, 3D or 4D.
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// probably missaligned.
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// points to a double
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char ndims; // 2=2d, 3=3d, 4=4d
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uint32 npoints;
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} POINTARRAY;
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// copies a point from the point array into the parameter point
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// will set point's z=0 (or NaN) if pa is 2d
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// will set point's m=0 (or NaN( if pa is 3d or 2d
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// NOTE: point is a real POINT3D *not* a pointer
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extern POINT4D getPoint4d(const POINTARRAY *pa, int n);
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// copies a point from the point array into the parameter point
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// will set point's z=0 (or NaN) if pa is 2d
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// will set point's m=0 (or NaN) if pa is 3d or 2d
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// NOTE: this will modify the point4d pointed to by 'point'.
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extern void getPoint4d_p(const POINTARRAY *pa, int n, char *point);
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// copies a point from the point array into the parameter point
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// will set point's z=0 (or NaN) if pa is 2d
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// NOTE: point is a real POINT3D *not* a pointer
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extern POINT3D getPoint3d(const POINTARRAY *pa, int n);
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// copies a point from the point array into the parameter point
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// will set point's z=0 (or NaN) if pa is 2d
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// NOTE: this will modify the point3d pointed to by 'point'.
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extern void getPoint3d_p(const POINTARRAY *pa, int n, char *point);
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// copies a point from the point array into the parameter point
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// z value (if present is not returned)
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// NOTE: point is a real POINT3D *not* a pointer
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extern POINT2D getPoint2d(const POINTARRAY *pa, int n);
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// copies a point from the point array into the parameter point
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// z value (if present is not returned)
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// NOTE: this will modify the point2d pointed to by 'point'.
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extern void getPoint2d_p(const POINTARRAY *pa, int n, char *point);
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// get a pointer to nth point of a POINTARRAY
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// You'll need to cast it to appropriate dimensioned point.
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// Note that if you cast to a higher dimensional point you'll
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// possibly corrupt the POINTARRAY.
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extern char *getPoint(const POINTARRAY *pa, int n);
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//--- here is a macro equivalent, for speed...
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//#define getPoint(x,n) &( (x)->serialized_pointlist[((x)->ndims*8)*(n)] )
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// constructs a POINTARRAY.
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// NOTE: points is *not* copied, so be careful about modification (can be aligned/missaligned)
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// NOTE: ndims is descriptive - it describes what type of data 'points'
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// points to. No data conversion is done.
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extern POINTARRAY *pointArray_construct(char *points, int ndims, uint32 npoints);
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//calculate the bounding box of a set of points
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// returns a 3d box
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// if pa is 2d, then box3d's zmin/zmax will be either 0 or NaN
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// dont call on an empty pa
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extern BOX3D *pointArray_bbox(const POINTARRAY *pa);
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//size of point represeneted in the POINTARRAY
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// 16 for 2d, 24 for 3d, 32 for 4d
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extern int pointArray_ptsize(const POINTARRAY *pa);
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/*
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*
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* LWGEOM types are an 8-bit char in this format:
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*
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* BSDDtttt
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*
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* WHERE
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* B = 16 byte BOX2DFLOAT4 follows (probably not aligned) [before SRID]
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* S = 4 byte SRID attached (0= not attached (-1), 1= attached)
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* DD = dimentionality (0=2d, 1=3d, 2= 4d)
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* tttt = actual type (as per the WKB type):
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*
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* enum wkbGeometryType {
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* wkbPoint = 1,
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* wkbLineString = 2,
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* wkbPolygon = 3,
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* wkbMultiPoint = 4,
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* wkbMultiLineString = 5,
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* wkbMultiPolygon = 6,
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* wkbGeometryCollection = 7
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* };
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*
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*/
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#define POINTTYPE 1
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#define LINETYPE 2
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#define POLYGONTYPE 3
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#define MULTIPOINTTYPE 4
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#define MULTILINETYPE 5
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#define MULTIPOLYGONTYPE 6
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#define COLLECTIONTYPE 7
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#define TYPE_SETTYPE(c,t) (((c)&0xF0)|t)
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#define TYPE_SETDIMS(c,d) (((c)&0xCF)|d)
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#define TYPE_SETHASBBOX(c,b) (((c)&0x7F)|b)
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#define TYPE_SETHASSRID(c,s) (((c)&0xBF)|s)
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extern bool lwgeom_hasSRID(unsigned char type); // true iff S bit is set
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extern bool lwgeom_hasBBOX(unsigned char type); // true iff B bit set
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extern int lwgeom_ndims(unsigned char type); // returns the DD value
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extern int lwgeom_getType(unsigned char type); // returns the tttt value
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extern unsigned char lwgeom_makeType(int ndims, char hasSRID, int type);
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extern unsigned char lwgeom_makeType_full(int ndims, char hasSRID, int type, bool hasBBOX);
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/*
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* This is the binary representation of lwgeom compatible
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* with postgresql varlena struct
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*/
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typedef struct {
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int32 size;
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unsigned char type; // encodes ndims, type, bbox presence,
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// srid presence
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char data[1];
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} LWGEOM;
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/*
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* Construct a full LWGEOM type (including size header)
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* from a serialized form.
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* The constructed LWGEOM object will be allocated using palloc
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* and the serialized form will be copied.
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* If you specify a SRID other then -1 it will be set.
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* If you request bbox (wantbbox=1) it will be extracted or computed
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* from the serialized form.
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*/
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extern LWGEOM *LWGEOM_construct(char *serialized, int SRID, int wantbbox);
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/*
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* Use this macro to extract the char * required
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* by most functions from an LWGEOM struct.
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* (which is an LWGEOM w/out int32 size casted to char *)
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*/
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#define SERIALIZED_FORM(x) ((char *)(x))+4
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/*
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* This function computes the size in bytes
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* of the serialized geometries.
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*/
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extern int lwgeom_size(const char *serialized_form);
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extern int lwgeom_size_subgeom(const char *serialized_form, int geom_number);
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//--------------------------------------------------------
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// all the base types (point/line/polygon) will have a
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// basic constructor, basic de-serializer, basic serializer,
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// bounding box finder and (TODO) serialized form size finder.
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//--------------------------------------------------------
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typedef struct
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{
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char ndims; // 2=2d, 3=3d, 4=4d, 5=undef
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int SRID; // spatial ref sys
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POINTARRAY *point; // hide 2d/3d (this will be an array of 1 point)
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} LWPOINT; // "light-weight point"
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// construct a new point. point will NOT be copied
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// use SRID=-1 for unknown SRID (will have 8bit type's S = 0)
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extern LWPOINT *lwpoint_construct(int ndims, int SRID, POINTARRAY *point);
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// given the LWPOINT serialized form (or a pointer into a muli* one)
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// construct a proper LWPOINT.
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// serialized_form should point to the 8bit type format (with type = 1)
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// Returns NULL if serialized form is not a point.
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// See serialized form doc
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extern LWPOINT *lwpoint_deserialize(char *serialized_form);
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// Find size this point would get when serialized (no BBOX)
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extern uint32 lwpoint_size(LWPOINT *point);
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// convert this point into its serialize form
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// result's first char will be the 8bit type. See serialized form doc
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extern char *lwpoint_serialize(LWPOINT *point);
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// same as above, writes to buf
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extern void lwpoint_serialize_buf(LWPOINT *point, char *buf, int *size);
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// find bounding box (standard one) zmin=zmax=0 if 2d (might change to NaN)
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extern BOX3D *lwpoint_findbbox(LWPOINT *point);
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// convenience functions to hide the POINTARRAY
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extern POINT2D lwpoint_getPoint2d(const LWPOINT *point);
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extern POINT3D lwpoint_getPoint3d(const LWPOINT *point);
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//--------------------------------------------------------
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typedef struct
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{
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char ndims; // 2=2d, 3=3d, 4=4d, 5=undef
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int SRID; // spatial ref sys -1=none
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POINTARRAY *points; // array of POINT3D
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} LWLINE; //"light-weight line"
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// construct a new LWLINE. points will *NOT* be copied
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// use SRID=-1 for unknown SRID (will have 8bit type's S = 0)
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extern LWLINE *lwline_construct(int ndims, int SRID, POINTARRAY *points);
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// given the LWGEOM serialized form (or a pointer into a muli* one)
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// construct a proper LWLINE.
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// serialized_form should point to the 8bit type format (with type = 2)
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// See serialized form doc
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extern LWLINE *lwline_deserialize(char *serialized_form);
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// find the size this line would get when serialized (no BBOX)
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extern uint32 lwline_size(LWLINE *line);
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// convert this line into its serialize form
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// result's first char will be the 8bit type. See serialized form doc
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// copies data.
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extern char *lwline_serialize(LWLINE *line);
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// same as above, writes to buf
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extern void lwline_serialize_buf(LWLINE *line, char *buf, int *size);
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// find bounding box (standard one) zmin=zmax=0 if 2d (might change to NaN)
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extern BOX3D *lwline_findbbox(LWLINE *line);
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//--------------------------------------------------------
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typedef struct
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{
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int32 SRID;
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char ndims;
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int nrings;
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POINTARRAY **rings; // list of rings (list of points)
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} LWPOLY; // "light-weight polygon"
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// construct a new LWPOLY. arrays (points/points per ring) will NOT be copied
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// use SRID=-1 for unknown SRID (will have 8bit type's S = 0)
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extern LWPOLY *lwpoly_construct(int ndims, int SRID, int nrings,POINTARRAY **points);
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// given the LWPOLY serialized form (or a pointer into a muli* one)
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// construct a proper LWPOLY.
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// serialized_form should point to the 8bit type format (with type = 3)
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// See serialized form doc
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extern LWPOLY *lwpoly_deserialize(char *serialized_form);
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// find the size this polygon would get when serialized (no bbox!)
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extern uint32 lwpoly_size(LWPOLY *poly);
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// create the serialized form of the polygon
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// result's first char will be the 8bit type. See serialized form doc
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// points copied
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extern char *lwpoly_serialize(LWPOLY *poly);
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// same as above, writes to buf
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extern void lwpoly_serialize_buf(LWPOLY *poly, char *buf, int *size);
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// find bounding box (standard one) zmin=zmax=0 if 2d (might change to NaN)
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extern BOX3D *lwpoly_findbbox(LWPOLY *poly);
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//------------------------------------------------------
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// Multi-geometries
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//
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// These are all handled equivelently so its easy to write iterator code.
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// NOTE NOTE: you can hand in a non-multigeometry to most of these functions
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// and get usual behavior (ie. get geometry 0 on a POINT
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// will return the point).
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// This makes coding even easier since you dont have to necessarily
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// differenciate between the multi* and non-multi geometries.
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//
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// NOTE: these usually work directly off the serialized form, so
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// they're a little more difficult to handle (and slower)
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// NOTE NOTE: the get functions maybe slow, so we may want to have an "analysed"
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// lwgeom that would just have pointer to the start of each sub-geometry.
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//------------------------------------------------------
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// use this version for speed. READ-ONLY!
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typedef struct
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{
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int SRID;
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const char *serialized_form; // orginal structure
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unsigned char type; // 8-bit type for the LWGEOM
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int ngeometries; // number of sub-geometries
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char * * const sub_geoms; // list of pointers (into serialized_form) of the sub-geoms
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} LWGEOM_INSPECTED;
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extern int lwgeom_size_inspected(const LWGEOM_INSPECTED *inspected, int geom_number);
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/*
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* This structure is intended to be used for geometry collection construction
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*/
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typedef struct
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{
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int SRID;
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int ndims;
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uint32 npoints;
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char **points;
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uint32 nlines;
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char **lines;
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uint32 npolys;
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char **polys;
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} LWGEOM_EXPLODED;
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void pfree_exploded(LWGEOM_EXPLODED *exploded);
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// Returns a 'palloced' union of the two input exploded geoms.
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// Returns NULL if SRID or ndims do not match.
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LWGEOM_EXPLODED * lwexploded_sum(LWGEOM_EXPLODED *exp1, LWGEOM_EXPLODED *exp2);
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/*
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* This function recursively scan the given serialized geometry
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* and returns a list of _all_ subgeoms in it (deep-first)
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*/
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extern LWGEOM_EXPLODED *lwgeom_explode(char *serialized);
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/*
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* Return the length of the serialized form corresponding
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* to this exploded structure.
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*/
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extern uint32 lwexploded_findlength(LWGEOM_EXPLODED *exp, int wantbbox);
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// Serialize an LWGEOM_EXPLODED object.
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// SRID and ndims will be taken from exploded structure.
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// wantbbox will determine result bbox.
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extern char *lwexploded_serialize(LWGEOM_EXPLODED *exploded, int wantbbox);
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// Same as lwexploded_serialize but writing to pre-allocated space
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extern void lwexploded_serialize_buf(LWGEOM_EXPLODED *exploded, int wantbbox, char *buf, int *retsize);
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// note - for a simple type (ie. point), this will have sub_geom[0] = serialized_form.
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// for multi-geomtries sub_geom[0] will be a few bytes into the serialized form
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// This function just computes the length of each sub-object and pre-caches this info.
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// For a geometry collection of multi* geometries, you can inspect the sub-components
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// as well.
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extern LWGEOM_INSPECTED *lwgeom_inspect(const char *serialized_form);
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// 1st geometry has geom_number = 0
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// if the actual sub-geometry isnt a POINT, null is returned (see _gettype()).
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// if there arent enough geometries, return null.
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// this is fine to call on a point (with geom_num=0), multipoint or geometrycollection
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extern LWPOINT *lwgeom_getpoint(char *serialized_form, int geom_number);
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extern LWPOINT *lwgeom_getpoint_inspected(LWGEOM_INSPECTED *inspected, int geom_number);
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// 1st geometry has geom_number = 0
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// if the actual geometry isnt a LINE, null is returned (see _gettype()).
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// if there arent enough geometries, return null.
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// this is fine to call on a line, multiline or geometrycollection
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extern LWLINE *lwgeom_getline(char *serialized_form, int geom_number);
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extern LWLINE *lwgeom_getline_inspected(LWGEOM_INSPECTED *inspected, int geom_number);
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// 1st geometry has geom_number = 0
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// if the actual geometry isnt a POLYGON, null is returned (see _gettype()).
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// if there arent enough geometries, return null.
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// this is fine to call on a polygon, multipolygon or geometrycollection
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extern LWPOLY *lwgeom_getpoly(char *serialized_form, int geom_number);
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extern LWPOLY *lwgeom_getpoly_inspected(LWGEOM_INSPECTED *inspected, int geom_number);
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// this gets the serialized form of a sub-geometry
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|
// 1st geometry has geom_number = 0
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// if this isnt a multi* geometry, and geom_number ==0 then it returns
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|
// itself
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// returns null on problems.
|
|
// in the future this is how you would access a muli* portion of a
|
|
// geometry collection.
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|
// GEOMETRYCOLLECTION(MULTIPOINT(0 0, 1 1), LINESTRING(0 0, 1 1))
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// ie. lwgeom_getpoint( lwgeom_getsubgeometry( serialized, 0), 1)
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// --> POINT(1 1)
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// you can inspect the sub-geometry as well if you wish.
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extern char *lwgeom_getsubgeometry(const char *serialized_form, int geom_number);
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extern char *lwgeom_getsubgeometry_inspected(LWGEOM_INSPECTED *inspected, int geom_number);
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// 1st geometry has geom_number = 0
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|
// use geom_number = -1 to find the actual type of the serialized form.
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// ie lwgeom_gettype( <'MULTIPOINT(0 0, 1 1)'>, -1)
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// --> multipoint
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// ie lwgeom_gettype( <'MULTIPOINT(0 0, 1 1)'>, 0)
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// --> point
|
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// gets the 8bit type of the geometry at location geom_number
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|
extern char lwgeom_getsubtype(char *serialized_form, int geom_number);
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extern char lwgeom_getsubtype_inspected(LWGEOM_INSPECTED *inspected, int geom_number);
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// how many sub-geometries are there?
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// for point,line,polygon will return 1.
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extern int lwgeom_getnumgeometries(char *serialized_form);
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extern int lwgeom_getnumgeometries_inspected(LWGEOM_INSPECTED *inspected);
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|
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// set finalType to COLLECTIONTYPE or 0 (0 means choose a best type)
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// (ie. give it 2 points and ask it to be a multipoint)
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// use SRID=-1 for unknown SRID (will have 8bit type's S = 0)
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// all subgeometries must have the same SRID
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|
// if you want to construct an inspected, call this then inspect the result...
|
|
extern char *lwgeom_construct(int SRID,int finalType,int ndims, int nsubgeometries, char **serialized_subs);
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// construct the empty geometry (GEOMETRYCOLLECTION(EMPTY))
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extern char *lwgeom_constructempty(int SRID,int ndims);
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extern void lwgeom_constructempty_buf(int SRID, int ndims, char *buf, int *size);
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int lwgeom_empty_length(int SRID);
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// get the SRID from the LWGEOM
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// none present => -1
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extern int lwgeom_getSRID(LWGEOM *lwgeom);
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extern int lwgeom_getsrid(char *serialized);
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extern LWGEOM *lwgeom_setSRID(LWGEOM *lwgeom, int32 newSRID);
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//get bounding box of LWGEOM (automatically calls the sub-geometries bbox generators)
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|
extern BOX3D *lw_geom_getBB(char *serialized_form);
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extern BOX3D *lw_geom_getBB_inspected(LWGEOM_INSPECTED *inspected);
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|
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|
//------------------------------------------------------
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|
// other stuff
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|
|
|
// handle the double-to-float conversion. The results of this
|
|
// will usually be a slightly bigger box because of the difference
|
|
// between float8 and float4 representations.
|
|
|
|
extern BOX2DFLOAT4 *box3d_to_box2df(BOX3D *box);
|
|
extern int box3d_to_box2df_p(BOX3D *box, BOX2DFLOAT4 *res);
|
|
extern BOX2DFLOAT4 *box_to_box2df(BOX *box); // postgresql standard type
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|
|
|
extern BOX3D box2df_to_box3d(BOX2DFLOAT4 *box);
|
|
extern void box2df_to_box3d_p(BOX2DFLOAT4 *box, BOX3D *box3d);
|
|
extern BOX box2df_to_box(BOX2DFLOAT4 *box); // postgresql standard type
|
|
extern void box2df_to_box_p(BOX2DFLOAT4 *box, BOX *out); // postgresql standard type
|
|
|
|
extern BOX3D *combine_boxes(BOX3D *b1, BOX3D *b2);
|
|
|
|
|
|
// returns a real entity so it doesnt leak
|
|
// if this has a pre-built BOX2d, then we use it,
|
|
// otherwise we need to compute it.
|
|
// WARNING! the EMPTY geom will result in a random BOX2D returned
|
|
extern BOX2DFLOAT4 getbox2d(char *serialized_form);
|
|
|
|
// this function writes to 'box' and returns 0 if serialized_form
|
|
// does not have a bounding box (empty geom)
|
|
extern int getbox2d_p(char *serialized_form, BOX2DFLOAT4 *box);
|
|
|
|
// this function returns a pointer to the 'internal' bounding
|
|
// box of a serialized-form geometry. If the geometry does
|
|
// not have an embedded bounding box the function returns NULL.
|
|
// READ-ONLY!
|
|
extern const BOX2DFLOAT4 * getbox2d_internal(char *serialized_form);
|
|
|
|
// Expand given box of 'd' units in all directions
|
|
void expand_box2d(BOX2DFLOAT4 *box, double d);
|
|
void expand_box3d(BOX3D *box, double d);
|
|
|
|
//****************************************************************
|
|
// memory management -- these only delete the memory associated
|
|
// directly with the structure - NOT the stuff pointing into
|
|
// the original de-serialized info
|
|
|
|
extern void pfree_inspected(LWGEOM_INSPECTED *inspected);
|
|
extern void pfree_point (LWPOINT *pt);
|
|
extern void pfree_line (LWLINE *line);
|
|
extern void pfree_polygon (LWPOLY *poly);
|
|
extern void pfree_POINTARRAY(POINTARRAY *pa);
|
|
|
|
|
|
//***********************************************************
|
|
// utility
|
|
|
|
extern uint32 get_uint32(const char *loc);
|
|
extern int32 get_int32(const char *loc);
|
|
extern void printPA(POINTARRAY *pa);
|
|
extern void printLWPOINT(LWPOINT *point);
|
|
extern void printLWLINE(LWLINE *line);
|
|
extern void printLWPOLY(LWPOLY *poly);
|
|
extern void printBYTES(unsigned char *a, int n);
|
|
extern void printMULTI(char *serialized);
|
|
extern void deparse_hex(unsigned char str, unsigned char *result);
|
|
extern void printType(unsigned char str);
|
|
|
|
|
|
//------------------------------------------------------------
|
|
//------------------------------------------------------------
|
|
// On serialized form (see top for the 8bit type implementation)
|
|
|
|
// NOTE: contrary to the original proposal, bounding boxes are *never*
|
|
// included in the geometry. You must either refer to the index
|
|
// or compute it on demand.
|
|
|
|
|
|
// The serialized form is always a stream of bytes. The first four are always
|
|
// the memory size of the LWGEOM (including the 4 byte memory size).
|
|
|
|
// The easiest way to describe the serialed form is with examples:
|
|
// (more examples are available in the postgis mailing list)
|
|
|
|
//3D point w/o bounding box::
|
|
//<int32> size = 29 bytes
|
|
//<char> type: S=0,D=1, tttt= 1
|
|
//<double> X
|
|
//<double> Y
|
|
//<double> Z
|
|
|
|
//2D line String
|
|
//<int32> size = ...
|
|
//<char> type: S=0,D=0, tttt= 2
|
|
//<uint32> npoints
|
|
//<double> X0
|
|
//<double> Y0
|
|
//<double> X1
|
|
//<double> Y1
|
|
//<double> X2
|
|
//<double> Y2
|
|
//...
|
|
|
|
//3D polygon w/o bounding box
|
|
//<int32> size = ...
|
|
//<char> type: S=0,D=0, tttt= 3
|
|
//<uint32> nrings
|
|
//<uint32> npoints in ring0
|
|
//<double> X0
|
|
//<double> Y0
|
|
//<double> X1
|
|
//<double> Y1
|
|
//<double> X2
|
|
//<double> Y2
|
|
//...
|
|
//<uint32> npoints in ring1
|
|
//<double> X0
|
|
//<double> Y0
|
|
//<double> X1
|
|
//<double> Y1
|
|
//<double> X2
|
|
//<double> Y2
|
|
//...
|
|
//...
|
|
|
|
|
|
// the multi* representations are very simple
|
|
|
|
//<int32> size = ...
|
|
//<char> type: ... with tttt= <multi* or geometrycollection>
|
|
//<int32> ngeometries
|
|
// <geometry zero, serialized form>
|
|
// <geometry one, serialized form>
|
|
// <geometry two, serialzied form>
|
|
// ...
|
|
|
|
|
|
|
|
// see implementation for more exact details.
|
|
|
|
|
|
//----------------------------------------------------------------
|
|
// example function (computes total length of the lines in a LWGEOM).
|
|
// This works for a LINESTRING, MULTILINESTRING, OR GEOMETRYCOLLECTION
|
|
|
|
|
|
|
|
// char *serialized_form = (char *) [[get from database]]
|
|
//
|
|
// double total_length_so_far = 0;
|
|
// for (int t=0;t< lwgeom_getnumgeometries(serialized_form) ; t++)
|
|
// {
|
|
// LWLINE *line = lwgeom_getline(serialized_form, t);
|
|
// if (line != NULL)
|
|
// {
|
|
// double length = findlength( POINT_ARRAY(line->points) ); //2d/3d aware
|
|
// total_length_so_far + = length;
|
|
// }
|
|
// }
|
|
// return total_length_so_far;
|
|
|
|
|
|
// using the LWGEOM_INSPECTED way:
|
|
|
|
|
|
// char *serialized_form = (char *) [[get from datbase]]
|
|
// LWGEOM_INSPECTED inspected_geom = lwgeom_inspect(serialized_form);
|
|
//
|
|
// double total_length_so_far = 0;
|
|
// for (int t=0;t< lwgeom_getnumgeometries(inspected_geom) ; t++)
|
|
// {
|
|
// LWLINE *line = lwgeom_getline(inspected_geom, t);
|
|
// if (line != NULL)
|
|
// {
|
|
// double length = findlength( POINT_ARRAY(line->points) ); //2d/3d aware
|
|
// total_length_so_far + = length;
|
|
// }
|
|
// }
|
|
// return total_length_so_far;
|
|
|
|
|
|
// the findlength() function could be written like based on functions like:
|
|
//
|
|
// POINT3D getPoint3d(POINTARRAY pa, int n); (for a 2d/3d point and 3d length)
|
|
// POINT2D getPoint2d(POINTARRAY pa, int n); (for a 2d/3d point and 2d length)
|
|
// NOTE: make sure your findlength() function knows what to do with z=NaN.
|
|
|
|
|
|
|
|
|
|
// other forwards (for indirect function calls)
|
|
|
|
Datum box2d_same(PG_FUNCTION_ARGS);
|
|
Datum box2d_overlap(PG_FUNCTION_ARGS);
|
|
Datum box2d_overleft(PG_FUNCTION_ARGS);
|
|
Datum box2d_left(PG_FUNCTION_ARGS);
|
|
Datum box2d_right(PG_FUNCTION_ARGS);
|
|
Datum box2d_overright(PG_FUNCTION_ARGS);
|
|
Datum box2d_contained(PG_FUNCTION_ARGS);
|
|
Datum box2d_contain(PG_FUNCTION_ARGS);
|
|
Datum box2d_inter(PG_FUNCTION_ARGS);
|
|
Datum box2d_union(PG_FUNCTION_ARGS);
|
|
|
|
Datum gist_lwgeom_compress(PG_FUNCTION_ARGS);
|
|
Datum gist_lwgeom_consistent(PG_FUNCTION_ARGS);
|
|
Datum gist_rtree_decompress(PG_FUNCTION_ARGS);
|
|
Datum lwgeom_box_union(PG_FUNCTION_ARGS);
|
|
Datum lwgeom_box_penalty(PG_FUNCTION_ARGS);
|
|
Datum lwgeom_gbox_same(PG_FUNCTION_ARGS);
|
|
Datum lwgeom_gbox_picksplit(PG_FUNCTION_ARGS);
|
|
|
|
|
|
extern float LWGEOM_Minf(float a, float b);
|
|
extern float LWGEOM_Maxf(float a, float b);
|
|
extern double LWGEOM_Mind(double a, double b);
|
|
extern double LWGEOM_Maxd(double a, double b);
|
|
|
|
|
|
|
|
extern BOX3D *lw_geom_getBB_simple(char *serialized_form);
|
|
|
|
extern float nextDown_f(double d);
|
|
extern float nextUp_f(double d);
|
|
extern double nextDown_d(float d);
|
|
extern double nextUp_d(float d);
|
|
|
|
|
|
|
|
#if ! defined(__MINGW32__)
|
|
#define max(a,b) ((a) > (b) ? (a) : (b))
|
|
#define min(a,b) ((a) <= (b) ? (a) : (b))
|
|
#endif
|
|
#define abs(a) ((a) < (0) ? (-a) : (a))
|
|
|
|
|
|
// general utilities
|
|
extern double lwgeom_polygon_area(LWPOLY *poly);
|
|
extern double lwgeom_polygon_perimeter(LWPOLY *poly);
|
|
extern double lwgeom_polygon_perimeter2d(LWPOLY *poly);
|
|
extern double lwgeom_pointarray_length2d(POINTARRAY *pts);
|
|
extern double lwgeom_pointarray_length(POINTARRAY *pts);
|
|
extern void lwgeom_force2d_recursive(char *serialized, char *optr, int *retsize);
|
|
extern void lwgeom_force3d_recursive(char *serialized, char *optr, int *retsize);
|
|
extern void lwgeom_force4d_recursive(char *serialized, char *optr, int *retsize);
|
|
extern double distance2d_pt_pt(POINT2D *p1, POINT2D *p2);
|
|
extern double distance2d_pt_seg(POINT2D *p, POINT2D *A, POINT2D *B);
|
|
extern double distance2d_seg_seg(POINT2D *A, POINT2D *B, POINT2D *C, POINT2D *D);
|
|
extern double distance2d_pt_ptarray(POINT2D *p, POINTARRAY *pa);
|
|
extern double distance2d_ptarray_ptarray(POINTARRAY *l1, POINTARRAY *l2);
|
|
extern int pt_in_ring_2d(POINT2D *p, POINTARRAY *ring);
|
|
extern int pt_in_poly_2d(POINT2D *p, LWPOLY *poly);
|
|
extern double distance2d_ptarray_poly(POINTARRAY *pa, LWPOLY *poly);
|
|
extern double distance2d_point_point(LWPOINT *point1, LWPOINT *point2);
|
|
extern double distance2d_point_line(LWPOINT *point, LWLINE *line);
|
|
extern double distance2d_line_line(LWLINE *line1, LWLINE *line2);
|
|
extern double distance2d_point_poly(LWPOINT *point, LWPOLY *poly);
|
|
extern double distance2d_poly_poly(LWPOLY *poly1, LWPOLY *poly2);
|
|
extern double distance2d_line_poly(LWLINE *line, LWPOLY *poly);
|
|
extern double lwgeom_mindistance2d_recursive(char *lw1, char *lw2);
|
|
extern void lwgeom_translate_recursive(char *serialized, double xoff, double yoff, double zoff);
|
|
extern void lwgeom_translate_ptarray(POINTARRAY *pa, double xoff, double yoff, double zoff);
|
|
extern int lwgeom_pt_inside_circle(POINT2D *p, double cx, double cy, double rad);
|
|
extern POINTARRAY *segmentize2d_ptarray(POINTARRAY *ipa, double dist);
|
|
extern int32 lwgeom_npoints(char *serialized);
|
|
extern bool ptarray_isccw(const POINTARRAY *pa);
|