/django/contrib/gis/gdal/prototypes/srs.py
Python | 72 lines | 39 code | 13 blank | 20 comment | 0 complexity | e0fc013559d010d31774dc9e435d0a49 MD5 | raw file
Possible License(s): BSD-3-Clause
- from ctypes import c_char_p, c_int, c_void_p, POINTER
- from django.contrib.gis.gdal.libgdal import lgdal, std_call
- from django.contrib.gis.gdal.prototypes.generation import \
- const_string_output, double_output, int_output, \
- srs_output, string_output, void_output
- ## Shortcut generation for routines with known parameters.
- def srs_double(f):
- """
- Creates a function prototype for the OSR routines that take
- the OSRSpatialReference object and
- """
- return double_output(f, [c_void_p, POINTER(c_int)], errcheck=True)
- def units_func(f):
- """
- Creates a ctypes function prototype for OSR units functions, e.g.,
- OSRGetAngularUnits, OSRGetLinearUnits.
- """
- return double_output(f, [c_void_p, POINTER(c_char_p)], strarg=True)
- # Creation & destruction.
- clone_srs = srs_output(std_call('OSRClone'), [c_void_p])
- new_srs = srs_output(std_call('OSRNewSpatialReference'), [c_char_p])
- release_srs = void_output(lgdal.OSRRelease, [c_void_p], errcheck=False)
- destroy_srs = void_output(std_call('OSRDestroySpatialReference'), [c_void_p], errcheck=False)
- srs_validate = void_output(lgdal.OSRValidate, [c_void_p])
- # Getting the semi_major, semi_minor, and flattening functions.
- semi_major = srs_double(lgdal.OSRGetSemiMajor)
- semi_minor = srs_double(lgdal.OSRGetSemiMinor)
- invflattening = srs_double(lgdal.OSRGetInvFlattening)
- # WKT, PROJ, EPSG, XML importation routines.
- from_wkt = void_output(lgdal.OSRImportFromWkt, [c_void_p, POINTER(c_char_p)])
- from_proj = void_output(lgdal.OSRImportFromProj4, [c_void_p, c_char_p])
- from_epsg = void_output(std_call('OSRImportFromEPSG'), [c_void_p, c_int])
- from_xml = void_output(lgdal.OSRImportFromXML, [c_void_p, c_char_p])
- from_user_input = void_output(std_call('OSRSetFromUserInput'), [c_void_p, c_char_p])
- # Morphing to/from ESRI WKT.
- morph_to_esri = void_output(lgdal.OSRMorphToESRI, [c_void_p])
- morph_from_esri = void_output(lgdal.OSRMorphFromESRI, [c_void_p])
- # Identifying the EPSG
- identify_epsg = void_output(lgdal.OSRAutoIdentifyEPSG, [c_void_p])
- # Getting the angular_units, linear_units functions
- linear_units = units_func(lgdal.OSRGetLinearUnits)
- angular_units = units_func(lgdal.OSRGetAngularUnits)
- # For exporting to WKT, PROJ.4, "Pretty" WKT, and XML.
- to_wkt = string_output(std_call('OSRExportToWkt'), [c_void_p, POINTER(c_char_p)])
- to_proj = string_output(std_call('OSRExportToProj4'), [c_void_p, POINTER(c_char_p)])
- to_pretty_wkt = string_output(std_call('OSRExportToPrettyWkt'), [c_void_p, POINTER(c_char_p), c_int], offset=-2)
- # Memory leak fixed in GDAL 1.5; still exists in 1.4.
- to_xml = string_output(lgdal.OSRExportToXML, [c_void_p, POINTER(c_char_p), c_char_p], offset=-2)
- # String attribute retrival routines.
- get_attr_value = const_string_output(std_call('OSRGetAttrValue'), [c_void_p, c_char_p, c_int])
- get_auth_name = const_string_output(lgdal.OSRGetAuthorityName, [c_void_p, c_char_p])
- get_auth_code = const_string_output(lgdal.OSRGetAuthorityCode, [c_void_p, c_char_p])
- # SRS Properties
- isgeographic = int_output(lgdal.OSRIsGeographic, [c_void_p])
- islocal = int_output(lgdal.OSRIsLocal, [c_void_p])
- isprojected = int_output(lgdal.OSRIsProjected, [c_void_p])
- # Coordinate transformation
- new_ct= srs_output(std_call('OCTNewCoordinateTransformation'), [c_void_p, c_void_p])
- destroy_ct = void_output(std_call('OCTDestroyCoordinateTransformation'), [c_void_p], errcheck=False)