author | Sverre Rabbelier <srabbelier@gmail.com> |
Sat, 07 Mar 2009 00:31:48 +0000 | |
changeset 1703 | 6d6813e83756 |
parent 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
323
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
1 |
from ctypes import c_char_p, c_int, c_size_t, c_uint, POINTER |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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2 |
from django.contrib.gis.geos.libgeos import lgeos, CS_PTR, GEOM_PTR |
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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3 |
from django.contrib.gis.geos.prototypes.errcheck import \ |
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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4 |
check_geom, check_minus_one, check_sized_string, check_string, check_zero |
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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5 |
|
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
6 |
### ctypes generation functions ### |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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7 |
def bin_constructor(func): |
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parents:
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8 |
"Generates a prototype for binary construction (HEX, WKB) GEOS routines." |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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9 |
func.argtypes = [c_char_p, c_size_t] |
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parents:
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10 |
func.restype = GEOM_PTR |
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11 |
func.errcheck = check_geom |
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12 |
return func |
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parents:
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13 |
|
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parents:
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14 |
# HEX & WKB output |
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parents:
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15 |
def bin_output(func): |
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parents:
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16 |
"Generates a prototype for the routines that return a a sized string." |
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parents:
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17 |
func.argtypes = [GEOM_PTR, POINTER(c_size_t)] |
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18 |
func.errcheck = check_sized_string |
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19 |
return func |
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20 |
|
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parents:
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21 |
def geom_output(func, argtypes): |
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22 |
"For GEOS routines that return a geometry." |
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23 |
if argtypes: func.argtypes = argtypes |
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24 |
func.restype = GEOM_PTR |
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25 |
func.errcheck = check_geom |
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26 |
return func |
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27 |
|
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28 |
def geom_index(func): |
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29 |
"For GEOS routines that return geometries from an index." |
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return geom_output(func, [GEOM_PTR, c_int]) |
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|
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32 |
def int_from_geom(func, zero=False): |
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33 |
"Argument is a geometry, return type is an integer." |
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34 |
func.argtypes = [GEOM_PTR] |
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35 |
func.restype = c_int |
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parents:
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36 |
if zero: |
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parents:
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37 |
func.errcheck = check_zero |
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38 |
else: |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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39 |
func.errcheck = check_minus_one |
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40 |
return func |
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41 |
|
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parents:
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42 |
def string_from_geom(func): |
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parents:
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43 |
"Argument is a Geometry, return type is a string." |
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44 |
# We do _not_ specify an argument type because we want just an |
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parents:
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45 |
# address returned from the function. |
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parents:
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46 |
func.argtypes = [GEOM_PTR] |
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parents:
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47 |
func.errcheck = check_string |
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parents:
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48 |
return func |
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49 |
|
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parents:
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50 |
### ctypes prototypes ### |
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51 |
|
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52 |
# TODO: Tell all users to use GEOS 3.0.0, instead of the release |
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53 |
# candidates, and use the new Reader and Writer APIs (e.g., |
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54 |
# GEOSWKT[Reader|Writer], GEOSWKB[Reader|Writer]). A good time |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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55 |
# to do this will be when Refractions releases a Windows PostGIS |
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parents:
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56 |
# installer using GEOS 3.0.0. |
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parents:
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57 |
|
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parents:
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58 |
# Creation routines from WKB, HEX, WKT |
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parents:
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59 |
from_hex = bin_constructor(lgeos.GEOSGeomFromHEX_buf) |
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60 |
from_wkb = bin_constructor(lgeos.GEOSGeomFromWKB_buf) |
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61 |
from_wkt = geom_output(lgeos.GEOSGeomFromWKT, [c_char_p]) |
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62 |
|
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63 |
# Output routines |
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64 |
to_hex = bin_output(lgeos.GEOSGeomToHEX_buf) |
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parents:
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65 |
to_wkb = bin_output(lgeos.GEOSGeomToWKB_buf) |
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parents:
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66 |
to_wkt = string_from_geom(lgeos.GEOSGeomToWKT) |
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parents:
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67 |
|
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parents:
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68 |
# The GEOS geometry type, typeid, num_coordites and number of geometries |
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parents:
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69 |
geos_normalize = int_from_geom(lgeos.GEOSNormalize) |
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parents:
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70 |
geos_type = string_from_geom(lgeos.GEOSGeomType) |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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71 |
geos_typeid = int_from_geom(lgeos.GEOSGeomTypeId) |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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72 |
get_dims = int_from_geom(lgeos.GEOSGeom_getDimensions, zero=True) |
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73 |
get_num_coords = int_from_geom(lgeos.GEOSGetNumCoordinates) |
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74 |
get_num_geoms = int_from_geom(lgeos.GEOSGetNumGeometries) |
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75 |
|
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parents:
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76 |
# Geometry creation factories |
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77 |
create_point = geom_output(lgeos.GEOSGeom_createPoint, [CS_PTR]) |
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78 |
create_linestring = geom_output(lgeos.GEOSGeom_createLineString, [CS_PTR]) |
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79 |
create_linearring = geom_output(lgeos.GEOSGeom_createLinearRing, [CS_PTR]) |
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parents:
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80 |
|
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parents:
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81 |
# Polygon and collection creation routines are special and will not |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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82 |
# have their argument types defined. |
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parents:
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83 |
create_polygon = geom_output(lgeos.GEOSGeom_createPolygon, None) |
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parents:
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84 |
create_collection = geom_output(lgeos.GEOSGeom_createCollection, None) |
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parents:
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85 |
|
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parents:
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86 |
# Ring routines |
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parents:
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87 |
get_extring = geom_output(lgeos.GEOSGetExteriorRing, [GEOM_PTR]) |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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88 |
get_intring = geom_index(lgeos.GEOSGetInteriorRingN) |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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89 |
get_nrings = int_from_geom(lgeos.GEOSGetNumInteriorRings) |
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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90 |
|
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
91 |
# Collection Routines |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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92 |
get_geomn = geom_index(lgeos.GEOSGetGeometryN) |
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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93 |
|
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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94 |
# Cloning |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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95 |
geom_clone = lgeos.GEOSGeom_clone |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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96 |
geom_clone.argtypes = [GEOM_PTR] |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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97 |
geom_clone.restype = GEOM_PTR |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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98 |
|
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
99 |
# Destruction routine. |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
100 |
destroy_geom = lgeos.GEOSGeom_destroy |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
101 |
destroy_geom.argtypes = [GEOM_PTR] |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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102 |
destroy_geom.restype = None |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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103 |
|
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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104 |
# SRID routines |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
105 |
geos_get_srid = lgeos.GEOSGetSRID |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
106 |
geos_get_srid.argtypes = [GEOM_PTR] |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
107 |
geos_get_srid.restype = c_int |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
108 |
|
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
109 |
geos_set_srid = lgeos.GEOSSetSRID |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
110 |
geos_set_srid.argtypes = [GEOM_PTR, c_int] |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff
changeset
|
111 |
geos_set_srid.restype = None |