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