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mariadb/sql/spatial.h
hf@eagle.intranet.mysql.r18.ru 4f368f9f93 Merging
2006-01-21 18:50:06 +04:00

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/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#ifndef _spatial_h
#define _spatial_h
#ifdef HAVE_SPATIAL
const uint SRID_SIZE= 4;
const uint SIZEOF_STORED_DOUBLE= 8;
const uint POINT_DATA_SIZE= SIZEOF_STORED_DOUBLE*2;
const uint WKB_HEADER_SIZE= 1+4;
const uint32 GET_SIZE_ERROR= ((uint32) -1);
struct st_point_2d
{
double x;
double y;
};
struct st_linear_ring
{
uint32 n_points;
st_point_2d points;
};
/***************************** MBR *******************************/
/*
It's ok that a lot of the functions are inline as these are only used once
in MySQL
*/
struct MBR
{
double xmin, ymin, xmax, ymax;
MBR()
{
xmin= ymin= DBL_MAX;
xmax= ymax= -DBL_MAX;
}
MBR(const double xmin_arg, const double ymin_arg,
const double xmax_arg, const double ymax_arg)
:xmin(xmin_arg), ymin(ymin_arg), xmax(xmax_arg), ymax(ymax_arg)
{}
MBR(const st_point_2d &min, const st_point_2d &max)
:xmin(min.x), ymin(min.y), xmax(max.x), ymax(max.y)
{}
inline void add_xy(double x, double y)
{
/* Not using "else" for proper one point MBR calculation */
if (x < xmin)
xmin= x;
if (x > xmax)
xmax= x;
if (y < ymin)
ymin= y;
if (y > ymax)
ymax= y;
}
void add_xy(const char *px, const char *py)
{
double x, y;
float8get(x, px);
float8get(y, py);
add_xy(x,y);
}
void add_mbr(const MBR *mbr)
{
if (mbr->xmin < xmin)
xmin= mbr->xmin;
if (mbr->xmax > xmax)
xmax= mbr->xmax;
if (mbr->ymin < ymin)
ymin= mbr->ymin;
if (mbr->ymax > ymax)
ymax= mbr->ymax;
}
int equals(const MBR *mbr)
{
/* The following should be safe, even if we compare doubles */
return ((mbr->xmin == xmin) && (mbr->ymin == ymin) &&
(mbr->xmax == xmax) && (mbr->ymax == ymax));
}
int disjoint(const MBR *mbr)
{
/* The following should be safe, even if we compare doubles */
return ((mbr->xmin > xmax) || (mbr->ymin > ymax) ||
(mbr->xmax < xmin) || (mbr->ymax < ymin));
}
int intersects(const MBR *mbr)
{
return !disjoint(mbr);
}
int touches(const MBR *mbr)
{
/* The following should be safe, even if we compare doubles */
return ((((mbr->xmin == xmax) || (mbr->xmax == xmin)) &&
((mbr->ymin >= ymin) && (mbr->ymin <= ymax) ||
(mbr->ymax >= ymin) && (mbr->ymax <= ymax))) ||
(((mbr->ymin == ymax) || (mbr->ymax == ymin)) &&
((mbr->xmin >= xmin) && (mbr->xmin <= xmax) ||
(mbr->xmax >= xmin) && (mbr->xmax <= xmax))));
}
int within(const MBR *mbr)
{
/* The following should be safe, even if we compare doubles */
return ((mbr->xmin <= xmin) && (mbr->ymin <= ymin) &&
(mbr->xmax >= xmax) && (mbr->ymax >= ymax));
}
int contains(const MBR *mbr)
{
/* The following should be safe, even if we compare doubles */
return ((mbr->xmin >= xmin) && (mbr->ymin >= ymin) &&
(mbr->xmax <= xmax) && (mbr->ymax <= ymax));
}
bool inner_point(double x, double y) const
{
/* The following should be safe, even if we compare doubles */
return (xmin<x) && (xmax>x) && (ymin<y) && (ymax>y);
}
int overlaps(const MBR *mbr)
{
int lb= mbr->inner_point(xmin, ymin);
int rb= mbr->inner_point(xmax, ymin);
int rt= mbr->inner_point(xmax, ymax);
int lt= mbr->inner_point(xmin, ymax);
int a = lb+rb+rt+lt;
return (a>0) && (a<4) && (!within(mbr));
}
};
/***************************** Geometry *******************************/
struct Geometry_buffer;
class Geometry
{
public:
static void *operator new(size_t size, void *buffer)
{
return buffer;
}
static void operator delete(void *ptr, void *buffer)
{}
static void operator delete(void *buffer)
{}
static String bad_geometry_data;
enum wkbType
{
wkb_point= 1,
wkb_linestring= 2,
wkb_polygon= 3,
wkb_multipoint= 4,
wkb_multilinestring= 5,
wkb_multipolygon= 6,
wkb_geometrycollection= 7,
wkb_end=7
};
enum wkbByteOrder
{
wkb_xdr= 0, /* Big Endian */
wkb_ndr= 1 /* Little Endian */
};
class Class_info
{
public:
LEX_STRING_WITH_INIT m_name;
int m_type_id;
void (*m_create_func)(void *);
Class_info(const char *name, int type_id, void(*create_func)(void *));
};
virtual const Class_info *get_class_info() const=0;
virtual uint32 get_data_size() const=0;
virtual bool init_from_wkt(Gis_read_stream *trs, String *wkb)=0;
/* returns the length of the wkb that was read */
virtual uint init_from_wkb(const char *wkb, uint len, wkbByteOrder bo,
String *res)=0;
virtual bool get_data_as_wkt(String *txt, const char **end) const=0;
virtual bool get_mbr(MBR *mbr, const char **end) const=0;
virtual bool dimension(uint32 *dim, const char **end) const=0;
virtual int get_x(double *x) const { return -1; }
virtual int get_y(double *y) const { return -1; }
virtual int length(double *len) const { return -1; }
virtual int area(double *ar, const char **end) const { return -1;}
virtual int is_closed(int *closed) const { return -1; }
virtual int num_interior_ring(uint32 *n_int_rings) const { return -1; }
virtual int num_points(uint32 *n_points) const { return -1; }
virtual int num_geometries(uint32 *num) const { return -1; }
virtual int start_point(String *point) const { return -1; }
virtual int end_point(String *point) const { return -1; }
virtual int exterior_ring(String *ring) const { return -1; }
virtual int centroid(String *point) const { return -1; }
virtual int point_n(uint32 num, String *result) const { return -1; }
virtual int interior_ring_n(uint32 num, String *result) const { return -1; }
virtual int geometry_n(uint32 num, String *result) const { return -1; }
public:
static Geometry *create_by_typeid(Geometry_buffer *buffer, int type_id)
{
Class_info *ci;
if (!(ci= find_class((int) type_id)))
return NULL;
(*ci->m_create_func)((void *)buffer);
return my_reinterpret_cast(Geometry *)(buffer);
}
static Geometry *construct(Geometry_buffer *buffer,
const char *data, uint32 data_len);
static Geometry *create_from_wkt(Geometry_buffer *buffer,
Gis_read_stream *trs, String *wkt,
bool init_stream=1);
static int create_from_wkb(Geometry_buffer *buffer,
const char *wkb, uint32 len, String *res);
int as_wkt(String *wkt, const char **end)
{
uint32 len= get_class_info()->m_name.length;
if (wkt->reserve(len + 2, 512))
return 1;
wkt->qs_append(get_class_info()->m_name.str, len);
wkt->qs_append('(');
if (get_data_as_wkt(wkt, end))
return 1;
wkt->qs_append(')');
return 0;
}
inline void set_data_ptr(const char *data, uint32 data_len)
{
m_data= data;
m_data_end= data + data_len;
}
inline void shift_wkb_header()
{
m_data+= WKB_HEADER_SIZE;
}
bool envelope(String *result) const;
static Class_info *ci_collection[wkb_end+1];
protected:
static Class_info *find_class(int type_id)
{
return ((type_id < wkb_point) || (type_id > wkb_end)) ?
NULL : ci_collection[type_id];
}
static Class_info *find_class(const char *name, uint32 len);
const char *append_points(String *txt, uint32 n_points,
const char *data, uint32 offset) const;
bool create_point(String *result, const char *data) const;
bool create_point(String *result, double x, double y) const;
const char *get_mbr_for_points(MBR *mbr, const char *data, uint offset)
const;
inline bool no_data(const char *cur_data, uint32 data_amount) const
{
return (cur_data + data_amount > m_data_end);
}
const char *m_data;
const char *m_data_end;
};
/***************************** Point *******************************/
class Gis_point: public Geometry
{
public:
uint32 get_data_size() const;
bool init_from_wkt(Gis_read_stream *trs, String *wkb);
uint init_from_wkb(const char *wkb, uint len, wkbByteOrder bo, String *res);
bool get_data_as_wkt(String *txt, const char **end) const;
bool get_mbr(MBR *mbr, const char **end) const;
int get_xy(double *x, double *y) const
{
const char *data= m_data;
if (no_data(data, SIZEOF_STORED_DOUBLE * 2))
return 1;
float8get(*x, data);
float8get(*y, data + SIZEOF_STORED_DOUBLE);
return 0;
}
int get_x(double *x) const
{
if (no_data(m_data, SIZEOF_STORED_DOUBLE))
return 1;
float8get(*x, m_data);
return 0;
}
int get_y(double *y) const
{
const char *data= m_data;
if (no_data(data, SIZEOF_STORED_DOUBLE * 2)) return 1;
float8get(*y, data + SIZEOF_STORED_DOUBLE);
return 0;
}
bool dimension(uint32 *dim, const char **end) const
{
*dim= 0;
*end= 0; /* No default end */
return 0;
}
const Class_info *get_class_info() const;
};
/***************************** LineString *******************************/
class Gis_line_string: public Geometry
{
public:
uint32 get_data_size() const;
bool init_from_wkt(Gis_read_stream *trs, String *wkb);
uint init_from_wkb(const char *wkb, uint len, wkbByteOrder bo, String *res);
bool get_data_as_wkt(String *txt, const char **end) const;
bool get_mbr(MBR *mbr, const char **end) const;
int length(double *len) const;
int is_closed(int *closed) const;
int num_points(uint32 *n_points) const;
int start_point(String *point) const;
int end_point(String *point) const;
int point_n(uint32 n, String *result) const;
bool dimension(uint32 *dim, const char **end) const
{
*dim= 1;
*end= 0; /* No default end */
return 0;
}
const Class_info *get_class_info() const;
};
/***************************** Polygon *******************************/
class Gis_polygon: public Geometry
{
public:
uint32 get_data_size() const;
bool init_from_wkt(Gis_read_stream *trs, String *wkb);
uint init_from_wkb(const char *wkb, uint len, wkbByteOrder bo, String *res);
bool get_data_as_wkt(String *txt, const char **end) const;
bool get_mbr(MBR *mbr, const char **end) const;
int area(double *ar, const char **end) const;
int exterior_ring(String *result) const;
int num_interior_ring(uint32 *n_int_rings) const;
int interior_ring_n(uint32 num, String *result) const;
int centroid_xy(double *x, double *y) const;
int centroid(String *result) const;
bool dimension(uint32 *dim, const char **end) const
{
*dim= 2;
*end= 0; /* No default end */
return 0;
}
const Class_info *get_class_info() const;
};
/***************************** MultiPoint *******************************/
class Gis_multi_point: public Geometry
{
public:
uint32 get_data_size() const;
bool init_from_wkt(Gis_read_stream *trs, String *wkb);
uint init_from_wkb(const char *wkb, uint len, wkbByteOrder bo, String *res);
bool get_data_as_wkt(String *txt, const char **end) const;
bool get_mbr(MBR *mbr, const char **end) const;
int num_geometries(uint32 *num) const;
int geometry_n(uint32 num, String *result) const;
bool dimension(uint32 *dim, const char **end) const
{
*dim= 0;
*end= 0; /* No default end */
return 0;
}
const Class_info *get_class_info() const;
};
/***************************** MultiLineString *******************************/
class Gis_multi_line_string: public Geometry
{
public:
uint32 get_data_size() const;
bool init_from_wkt(Gis_read_stream *trs, String *wkb);
uint init_from_wkb(const char *wkb, uint len, wkbByteOrder bo, String *res);
bool get_data_as_wkt(String *txt, const char **end) const;
bool get_mbr(MBR *mbr, const char **end) const;
int num_geometries(uint32 *num) const;
int geometry_n(uint32 num, String *result) const;
int length(double *len) const;
int is_closed(int *closed) const;
bool dimension(uint32 *dim, const char **end) const
{
*dim= 1;
*end= 0; /* No default end */
return 0;
}
const Class_info *get_class_info() const;
};
/***************************** MultiPolygon *******************************/
class Gis_multi_polygon: public Geometry
{
public:
uint32 get_data_size() const;
bool init_from_wkt(Gis_read_stream *trs, String *wkb);
uint init_from_wkb(const char *wkb, uint len, wkbByteOrder bo, String *res);
bool get_data_as_wkt(String *txt, const char **end) const;
bool get_mbr(MBR *mbr, const char **end) const;
int num_geometries(uint32 *num) const;
int geometry_n(uint32 num, String *result) const;
int area(double *ar, const char **end) const;
int centroid(String *result) const;
bool dimension(uint32 *dim, const char **end) const
{
*dim= 2;
*end= 0; /* No default end */
return 0;
}
const Class_info *get_class_info() const;
};
/*********************** GeometryCollection *******************************/
class Gis_geometry_collection: public Geometry
{
public:
uint32 get_data_size() const;
bool init_from_wkt(Gis_read_stream *trs, String *wkb);
uint init_from_wkb(const char *wkb, uint len, wkbByteOrder bo, String *res);
bool get_data_as_wkt(String *txt, const char **end) const;
bool get_mbr(MBR *mbr, const char **end) const;
int num_geometries(uint32 *num) const;
int geometry_n(uint32 num, String *result) const;
bool dimension(uint32 *dim, const char **end) const;
const Class_info *get_class_info() const;
};
const int geometry_buffer_size= sizeof(Gis_point);
struct Geometry_buffer
{
void *arr[(geometry_buffer_size - 1)/sizeof(void *) + 1];
};
#endif /*HAVE_SPATAIAL*/
#endif
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