spatial.h
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上传日期:2022-05-23
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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>x);
- }
- 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)
- {}
- 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