author | Lennard de Rijk <ljvderijk@gmail.com> |
Sat, 29 Nov 2008 14:41:43 +0000 | |
changeset 609 | 45bc26f48090 |
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>
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from ctypes import c_char_p, c_int, c_void_p, POINTER |
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Load ../vendor/django into trunk/app/django.
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from django.contrib.gis.gdal.libgdal import lgdal, std_call |
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from django.contrib.gis.gdal.prototypes.generation import \ |
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const_string_output, double_output, int_output, \ |
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srs_output, string_output, void_output |
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|
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## Shortcut generation for routines with known parameters. |
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def srs_double(f): |
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""" |
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Creates a function prototype for the OSR routines that take |
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the OSRSpatialReference object and |
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""" |
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return double_output(f, [c_void_p, POINTER(c_int)], errcheck=True) |
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|
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def units_func(f): |
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""" |
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17 |
Creates a ctypes function prototype for OSR units functions, e.g., |
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OSRGetAngularUnits, OSRGetLinearUnits. |
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""" |
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return double_output(f, [c_void_p, POINTER(c_char_p)], strarg=True) |
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|
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# Creation & destruction. |
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clone_srs = srs_output(std_call('OSRClone'), [c_void_p]) |
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new_srs = srs_output(std_call('OSRNewSpatialReference'), [c_char_p]) |
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release_srs = void_output(lgdal.OSRRelease, [c_void_p], errcheck=False) |
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destroy_srs = void_output(std_call('OSRDestroySpatialReference'), [c_void_p], errcheck=False) |
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srs_validate = void_output(lgdal.OSRValidate, [c_void_p]) |
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# Getting the semi_major, semi_minor, and flattening functions. |
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semi_major = srs_double(lgdal.OSRGetSemiMajor) |
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semi_minor = srs_double(lgdal.OSRGetSemiMinor) |
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invflattening = srs_double(lgdal.OSRGetInvFlattening) |
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# WKT, PROJ, EPSG, XML importation routines. |
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from_wkt = void_output(lgdal.OSRImportFromWkt, [c_void_p, POINTER(c_char_p)]) |
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from_proj = void_output(lgdal.OSRImportFromProj4, [c_void_p, c_char_p]) |
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from_epsg = void_output(std_call('OSRImportFromEPSG'), [c_void_p, c_int]) |
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from_xml = void_output(lgdal.OSRImportFromXML, [c_void_p, c_char_p]) |
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# Morphing to/from ESRI WKT. |
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morph_to_esri = void_output(lgdal.OSRMorphToESRI, [c_void_p]) |
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morph_from_esri = void_output(lgdal.OSRMorphFromESRI, [c_void_p]) |
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# Identifying the EPSG |
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identify_epsg = void_output(lgdal.OSRAutoIdentifyEPSG, [c_void_p]) |
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# Getting the angular_units, linear_units functions |
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linear_units = units_func(lgdal.OSRGetLinearUnits) |
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angular_units = units_func(lgdal.OSRGetAngularUnits) |
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# For exporting to WKT, PROJ.4, "Pretty" WKT, and XML. |
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to_wkt = string_output(std_call('OSRExportToWkt'), [c_void_p, POINTER(c_char_p)]) |
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to_proj = string_output(std_call('OSRExportToProj4'), [c_void_p, POINTER(c_char_p)]) |
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to_pretty_wkt = string_output(std_call('OSRExportToPrettyWkt'), [c_void_p, POINTER(c_char_p), c_int], offset=-2) |
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# Memory leak fixed in GDAL 1.5; still exists in 1.4. |
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to_xml = string_output(lgdal.OSRExportToXML, [c_void_p, POINTER(c_char_p), c_char_p], offset=-2) |
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# String attribute retrival routines. |
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get_attr_value = const_string_output(std_call('OSRGetAttrValue'), [c_void_p, c_char_p, c_int]) |
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get_auth_name = const_string_output(lgdal.OSRGetAuthorityName, [c_void_p, c_char_p]) |
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get_auth_code = const_string_output(lgdal.OSRGetAuthorityCode, [c_void_p, c_char_p]) |
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# SRS Properties |
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isgeographic = int_output(lgdal.OSRIsGeographic, [c_void_p]) |
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islocal = int_output(lgdal.OSRIsLocal, [c_void_p]) |
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isprojected = int_output(lgdal.OSRIsProjected, [c_void_p]) |
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# Coordinate transformation |
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new_ct= srs_output(std_call('OCTNewCoordinateTransformation'), [c_void_p, c_void_p]) |
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destroy_ct = void_output(std_call('OCTDestroyCoordinateTransformation'), [c_void_p], errcheck=False) |