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Add a maptile_for_point() function for MySQL to work out which slippy

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map tile a given point lies in.
This commit is contained in:
Tom Hughes 2007-10-09 22:59:32 +00:00
parent e0fd80c428
commit 250466e58e
3 changed files with 46 additions and 13 deletions
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13
db/README
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@ -32,11 +32,6 @@ Run this command in the db/functions directory:
$ make $ make
The above command should work for linux and most other Unix systems
that use ELF shared objects. For MacOS X you will need to do:
$ make libquadtile.dylib
Make sure the db/functions directory is on the MySQL server's library Make sure the db/functions directory is on the MySQL server's library
path and restart the MySQL server. On linux the easiest way to do this path and restart the MySQL server. On linux the easiest way to do this
is to create /etc/ld.so.conf.d/osm.conf and place the path to the is to create /etc/ld.so.conf.d/osm.conf and place the path to the
@ -50,12 +45,8 @@ $ mysql -u <uid> -p openstreetmap
(change <uid> with appropriate username of administrative user eg. root ) (change <uid> with appropriate username of administrative user eg. root )
> create function tile_for_point returns integer soname 'libquadtile.so'; > create function tile_for_point returns integer soname 'libmyosm.so';
> exit > create function maptile_for_point returns integer soname 'libmyosm.so';
or, for MacOS X:
> create function tile_for_point returns integer soname 'libquadtile.dylib';
> exit > exit
Creating database skeleton tables Creating database skeleton tables

7
db/functions/Makefile
View file

@ -7,8 +7,11 @@ else
LDFLAGS=-shared LDFLAGS=-shared
endif endif
libquadtile.so: quadtile.o libmyosm.so: quadtile.o maptile.o
cc ${LDFLAGS} -o libquadtile.so quadtile.o cc ${LDFLAGS} -o libmyosm.so quadtile.o maptile.o
quadtile.o: quadtile.c ${QTDIR}/quad_tile.h quadtile.o: quadtile.c ${QTDIR}/quad_tile.h
cc `mysql_config --include` -I${QTDIR} -fPIC -O3 -c -o quadtile.o quadtile.c cc `mysql_config --include` -I${QTDIR} -fPIC -O3 -c -o quadtile.o quadtile.c
maptile.o: maptile.c
cc `mysql_config --include` -fPIC -O3 -c -o maptile.o maptile.c

39
db/functions/maptile.c Normal file
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@ -0,0 +1,39 @@
#include <my_global.h>
#include <my_sys.h>
#include <m_string.h>
#include <mysql.h>
my_bool maptile_for_point_init(UDF_INIT *initid, UDF_ARGS *args, char *message)
{
if ( args->arg_count != 3 ||
args->arg_type[0] != INT_RESULT ||
args->arg_type[1] != INT_RESULT ||
args->arg_type[2] != INT_RESULT )
{
strcpy( message, "Your maptile_for_point arguments are bogus!" );
return 1;
}
return 0;
}
void maptile_for_point_deinit(UDF_INIT *initid)
{
return;
}
long long maptile_for_point(UDF_INIT *initid, UDF_ARGS *args, char *is_null, char *error)
{
double lat = *(long long *)args->args[0] / 10000000.0;
double lon = *(long long *)args->args[1] / 10000000.0;
long long zoom = *(long long *)args->args[2];
double scale = pow(2, zoom);
double r_per_d = M_PI / 180;
unsigned int x;
unsigned int y;
x = floor((lon + 180.0) * scale / 360.0);
y = floor((1 - log(tan(lat * r_per_d) + 1.0 / cos(lat * r_per_d)) / M_PI) * scale / 2.0);
return (x << zoom) | y;
}