725 lines
25 KiB
Python
725 lines
25 KiB
Python
"""
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This module contains the 'base' GEOSGeometry object -- all GEOS Geometries
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inherit from this object.
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"""
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from __future__ import unicode_literals
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import json
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import warnings
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from ctypes import addressof, byref, c_double
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from django.contrib.gis import gdal
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from django.contrib.gis.geometry.regex import hex_regex, json_regex, wkt_regex
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from django.contrib.gis.geos import prototypes as capi
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from django.contrib.gis.geos.base import GEOSBase
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from django.contrib.gis.geos.coordseq import GEOSCoordSeq
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from django.contrib.gis.geos.error import GEOSException
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from django.contrib.gis.geos.libgeos import GEOM_PTR
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from django.contrib.gis.geos.mutable_list import ListMixin
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from django.contrib.gis.geos.prepared import PreparedGeometry
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from django.contrib.gis.geos.prototypes.io import (
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ewkb_w, wkb_r, wkb_w, wkt_r, wkt_w,
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)
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from django.utils import six
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from django.utils.deconstruct import deconstructible
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from django.utils.deprecation import RemovedInDjango20Warning
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from django.utils.encoding import force_bytes, force_text
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@deconstructible
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class GEOSGeometry(GEOSBase, ListMixin):
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"A class that, generally, encapsulates a GEOS geometry."
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_GEOS_CLASSES = None
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ptr_type = GEOM_PTR
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has_cs = False # Only Point, LineString, LinearRing have coordinate sequences
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def __init__(self, geo_input, srid=None):
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"""
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The base constructor for GEOS geometry objects, and may take the
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following inputs:
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* strings:
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- WKT
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- HEXEWKB (a PostGIS-specific canonical form)
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- GeoJSON (requires GDAL)
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* buffer:
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- WKB
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The `srid` keyword is used to specify the Source Reference Identifier
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(SRID) number for this Geometry. If not set, the SRID will be None.
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"""
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if isinstance(geo_input, bytes):
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geo_input = force_text(geo_input)
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if isinstance(geo_input, six.string_types):
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wkt_m = wkt_regex.match(geo_input)
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if wkt_m:
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# Handling WKT input.
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if wkt_m.group('srid'):
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srid = int(wkt_m.group('srid'))
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g = wkt_r().read(force_bytes(wkt_m.group('wkt')))
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elif hex_regex.match(geo_input):
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# Handling HEXEWKB input.
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g = wkb_r().read(force_bytes(geo_input))
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elif json_regex.match(geo_input):
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# Handling GeoJSON input.
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if not gdal.HAS_GDAL:
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raise ValueError('Initializing geometry from JSON input requires GDAL.')
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g = wkb_r().read(gdal.OGRGeometry(geo_input).wkb)
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else:
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raise ValueError('String or unicode input unrecognized as WKT EWKT, and HEXEWKB.')
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elif isinstance(geo_input, GEOM_PTR):
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# When the input is a pointer to a geometry (GEOM_PTR).
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g = geo_input
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elif isinstance(geo_input, six.memoryview):
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# When the input is a buffer (WKB).
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g = wkb_r().read(geo_input)
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elif isinstance(geo_input, GEOSGeometry):
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g = capi.geom_clone(geo_input.ptr)
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else:
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# Invalid geometry type.
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raise TypeError('Improper geometry input type: %s' % str(type(geo_input)))
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if g:
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# Setting the pointer object with a valid pointer.
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self.ptr = g
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else:
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raise GEOSException('Could not initialize GEOS Geometry with given input.')
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# Post-initialization setup.
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self._post_init(srid)
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def _post_init(self, srid):
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"Helper routine for performing post-initialization setup."
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# Setting the SRID, if given.
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if srid and isinstance(srid, int):
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self.srid = srid
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# Setting the class type (e.g., Point, Polygon, etc.)
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if GEOSGeometry._GEOS_CLASSES is None:
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# Lazy-loaded variable to avoid import conflicts with GEOSGeometry.
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from .linestring import LineString, LinearRing
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from .point import Point
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from .polygon import Polygon
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from .collections import (
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GeometryCollection, MultiPoint, MultiLineString, MultiPolygon)
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GEOSGeometry._GEOS_CLASSES = {
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0: Point,
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1: LineString,
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2: LinearRing,
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3: Polygon,
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4: MultiPoint,
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5: MultiLineString,
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6: MultiPolygon,
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7: GeometryCollection,
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}
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self.__class__ = GEOSGeometry._GEOS_CLASSES[self.geom_typeid]
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# Setting the coordinate sequence for the geometry (will be None on
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# geometries that do not have coordinate sequences)
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self._set_cs()
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def __del__(self):
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"""
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Destroys this Geometry; in other words, frees the memory used by the
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GEOS C++ object.
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"""
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try:
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capi.destroy_geom(self._ptr)
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except (AttributeError, TypeError):
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pass # Some part might already have been garbage collected
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def __copy__(self):
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"""
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Returns a clone because the copy of a GEOSGeometry may contain an
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invalid pointer location if the original is garbage collected.
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"""
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return self.clone()
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def __deepcopy__(self, memodict):
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"""
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The `deepcopy` routine is used by the `Node` class of django.utils.tree;
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thus, the protocol routine needs to be implemented to return correct
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copies (clones) of these GEOS objects, which use C pointers.
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"""
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return self.clone()
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def __str__(self):
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"EWKT is used for the string representation."
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return self.ewkt
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def __repr__(self):
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"Short-hand representation because WKT may be very large."
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return '<%s object at %s>' % (self.geom_type, hex(addressof(self.ptr)))
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# Pickling support
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def __getstate__(self):
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# The pickled state is simply a tuple of the WKB (in string form)
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# and the SRID.
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return bytes(self.wkb), self.srid
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def __setstate__(self, state):
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# Instantiating from the tuple state that was pickled.
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wkb, srid = state
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ptr = wkb_r().read(six.memoryview(wkb))
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if not ptr:
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raise GEOSException('Invalid Geometry loaded from pickled state.')
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self.ptr = ptr
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self._post_init(srid)
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# Comparison operators
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def __eq__(self, other):
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"""
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Equivalence testing, a Geometry may be compared with another Geometry
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or a WKT representation.
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"""
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if isinstance(other, six.string_types):
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return self.wkt == other
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elif isinstance(other, GEOSGeometry):
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return self.equals_exact(other)
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else:
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return False
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def __ne__(self, other):
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"The not equals operator."
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return not (self == other)
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# ### Geometry set-like operations ###
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# Thanks to Sean Gillies for inspiration:
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# http://lists.gispython.org/pipermail/community/2007-July/001034.html
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# g = g1 | g2
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def __or__(self, other):
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"Returns the union of this Geometry and the other."
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return self.union(other)
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# g = g1 & g2
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def __and__(self, other):
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"Returns the intersection of this Geometry and the other."
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return self.intersection(other)
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# g = g1 - g2
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def __sub__(self, other):
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"Return the difference this Geometry and the other."
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return self.difference(other)
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# g = g1 ^ g2
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def __xor__(self, other):
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"Return the symmetric difference of this Geometry and the other."
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return self.sym_difference(other)
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# #### Coordinate Sequence Routines ####
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def _set_cs(self):
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"Sets the coordinate sequence for this Geometry."
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if self.has_cs:
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self._cs = GEOSCoordSeq(capi.get_cs(self.ptr), self.hasz)
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else:
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self._cs = None
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@property
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def coord_seq(self):
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"Returns a clone of the coordinate sequence for this Geometry."
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if self.has_cs:
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return self._cs.clone()
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# #### Geometry Info ####
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@property
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def geom_type(self):
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"Returns a string representing the Geometry type, e.g. 'Polygon'"
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return capi.geos_type(self.ptr).decode()
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@property
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def geom_typeid(self):
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"Returns an integer representing the Geometry type."
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return capi.geos_typeid(self.ptr)
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@property
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def num_geom(self):
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"Returns the number of geometries in the Geometry."
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return capi.get_num_geoms(self.ptr)
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@property
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def num_coords(self):
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"Returns the number of coordinates in the Geometry."
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return capi.get_num_coords(self.ptr)
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@property
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def num_points(self):
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"Returns the number points, or coordinates, in the Geometry."
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return self.num_coords
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@property
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def dims(self):
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"Returns the dimension of this Geometry (0=point, 1=line, 2=surface)."
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return capi.get_dims(self.ptr)
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def normalize(self):
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"Converts this Geometry to normal form (or canonical form)."
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return capi.geos_normalize(self.ptr)
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# #### Unary predicates ####
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@property
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def empty(self):
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"""
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Returns a boolean indicating whether the set of points in this Geometry
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are empty.
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"""
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return capi.geos_isempty(self.ptr)
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@property
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def hasz(self):
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"Returns whether the geometry has a 3D dimension."
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return capi.geos_hasz(self.ptr)
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@property
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def ring(self):
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"Returns whether or not the geometry is a ring."
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return capi.geos_isring(self.ptr)
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@property
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def simple(self):
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"Returns false if the Geometry not simple."
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return capi.geos_issimple(self.ptr)
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@property
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def valid(self):
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"This property tests the validity of this Geometry."
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return capi.geos_isvalid(self.ptr)
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@property
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def valid_reason(self):
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"""
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Returns a string containing the reason for any invalidity.
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"""
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return capi.geos_isvalidreason(self.ptr).decode()
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# #### Binary predicates. ####
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def contains(self, other):
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"Returns true if other.within(this) returns true."
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return capi.geos_contains(self.ptr, other.ptr)
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def covers(self, other):
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"""
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Return True if the DE-9IM Intersection Matrix for the two geometries is
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T*****FF*, *T****FF*, ***T**FF*, or ****T*FF*. If either geometry is
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empty, return False.
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"""
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return capi.geos_covers(self.ptr, other.ptr)
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def crosses(self, other):
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"""
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Returns true if the DE-9IM intersection matrix for the two Geometries
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is T*T****** (for a point and a curve,a point and an area or a line and
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an area) 0******** (for two curves).
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"""
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return capi.geos_crosses(self.ptr, other.ptr)
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def disjoint(self, other):
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"""
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Returns true if the DE-9IM intersection matrix for the two Geometries
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is FF*FF****.
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"""
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return capi.geos_disjoint(self.ptr, other.ptr)
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def equals(self, other):
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"""
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Returns true if the DE-9IM intersection matrix for the two Geometries
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is T*F**FFF*.
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"""
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return capi.geos_equals(self.ptr, other.ptr)
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def equals_exact(self, other, tolerance=0):
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"""
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Returns true if the two Geometries are exactly equal, up to a
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specified tolerance.
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"""
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return capi.geos_equalsexact(self.ptr, other.ptr, float(tolerance))
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def intersects(self, other):
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"Returns true if disjoint returns false."
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return capi.geos_intersects(self.ptr, other.ptr)
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def overlaps(self, other):
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"""
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Returns true if the DE-9IM intersection matrix for the two Geometries
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is T*T***T** (for two points or two surfaces) 1*T***T** (for two curves).
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"""
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return capi.geos_overlaps(self.ptr, other.ptr)
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def relate_pattern(self, other, pattern):
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"""
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Returns true if the elements in the DE-9IM intersection matrix for the
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two Geometries match the elements in pattern.
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"""
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if not isinstance(pattern, six.string_types) or len(pattern) > 9:
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raise GEOSException('invalid intersection matrix pattern')
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return capi.geos_relatepattern(self.ptr, other.ptr, force_bytes(pattern))
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def touches(self, other):
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"""
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Returns true if the DE-9IM intersection matrix for the two Geometries
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is FT*******, F**T***** or F***T****.
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"""
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return capi.geos_touches(self.ptr, other.ptr)
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def within(self, other):
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"""
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Returns true if the DE-9IM intersection matrix for the two Geometries
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is T*F**F***.
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"""
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return capi.geos_within(self.ptr, other.ptr)
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# #### SRID Routines ####
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@property
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def srid(self):
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"Gets the SRID for the geometry, returns None if no SRID is set."
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s = capi.geos_get_srid(self.ptr)
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if s == 0:
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return None
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else:
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return s
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@srid.setter
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def srid(self, srid):
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"Sets the SRID for the geometry."
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capi.geos_set_srid(self.ptr, 0 if srid is None else srid)
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def get_srid(self):
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warnings.warn(
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"`get_srid()` is deprecated, use the `srid` property instead.",
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RemovedInDjango20Warning, 2
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)
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return self.srid
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def set_srid(self, srid):
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warnings.warn(
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"`set_srid()` is deprecated, use the `srid` property instead.",
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RemovedInDjango20Warning, 2
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)
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self.srid = srid
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# #### Output Routines ####
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@property
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def ewkt(self):
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"""
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Returns the EWKT (SRID + WKT) of the Geometry.
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"""
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srid = self.srid
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return 'SRID=%s;%s' % (srid, self.wkt) if srid else self.wkt
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@property
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def wkt(self):
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"Returns the WKT (Well-Known Text) representation of this Geometry."
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return wkt_w(dim=3 if self.hasz else 2, trim=True).write(self).decode()
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@property
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def hex(self):
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"""
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Returns the WKB of this Geometry in hexadecimal form. Please note
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that the SRID is not included in this representation because it is not
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a part of the OGC specification (use the `hexewkb` property instead).
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"""
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# A possible faster, all-python, implementation:
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# str(self.wkb).encode('hex')
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return wkb_w(dim=3 if self.hasz else 2).write_hex(self)
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@property
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def hexewkb(self):
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"""
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Returns the EWKB of this Geometry in hexadecimal form. This is an
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extension of the WKB specification that includes SRID value that are
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a part of this geometry.
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"""
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return ewkb_w(dim=3 if self.hasz else 2).write_hex(self)
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@property
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def json(self):
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"""
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Returns GeoJSON representation of this Geometry.
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"""
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return json.dumps({'type': self.__class__.__name__, 'coordinates': self.coords})
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geojson = json
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@property
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def wkb(self):
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"""
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Returns the WKB (Well-Known Binary) representation of this Geometry
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as a Python buffer. SRID and Z values are not included, use the
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`ewkb` property instead.
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"""
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return wkb_w(3 if self.hasz else 2).write(self)
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@property
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def ewkb(self):
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"""
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Return the EWKB representation of this Geometry as a Python buffer.
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This is an extension of the WKB specification that includes any SRID
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value that are a part of this geometry.
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"""
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return ewkb_w(3 if self.hasz else 2).write(self)
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@property
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def kml(self):
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"Returns the KML representation of this Geometry."
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gtype = self.geom_type
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return '<%s>%s</%s>' % (gtype, self.coord_seq.kml, gtype)
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@property
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def prepared(self):
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"""
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Returns a PreparedGeometry corresponding to this geometry -- it is
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optimized for the contains, intersects, and covers operations.
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"""
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return PreparedGeometry(self)
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# #### GDAL-specific output routines ####
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@property
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def ogr(self):
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"Returns the OGR Geometry for this Geometry."
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if not gdal.HAS_GDAL:
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raise GEOSException('GDAL required to convert to an OGRGeometry.')
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if self.srid:
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try:
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return gdal.OGRGeometry(self.wkb, self.srid)
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except gdal.SRSException:
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pass
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return gdal.OGRGeometry(self.wkb)
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@property
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def srs(self):
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"Returns the OSR SpatialReference for SRID of this Geometry."
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if not gdal.HAS_GDAL:
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raise GEOSException('GDAL required to return a SpatialReference object.')
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if self.srid:
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try:
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return gdal.SpatialReference(self.srid)
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except gdal.SRSException:
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pass
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return None
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@property
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def crs(self):
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"Alias for `srs` property."
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return self.srs
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def transform(self, ct, clone=False):
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"""
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Requires GDAL. Transforms the geometry according to the given
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transformation object, which may be an integer SRID, and WKT or
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PROJ.4 string. By default, the geometry is transformed in-place and
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nothing is returned. However if the `clone` keyword is set, then this
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geometry will not be modified and a transformed clone will be returned
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instead.
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"""
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srid = self.srid
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if ct == srid:
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# short-circuit where source & dest SRIDs match
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if clone:
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return self.clone()
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else:
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return
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|
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if not gdal.HAS_GDAL:
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raise GEOSException("GDAL library is not available to transform() geometry.")
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|
|
|
if isinstance(ct, gdal.CoordTransform):
|
|
# We don't care about SRID because CoordTransform presupposes
|
|
# source SRS.
|
|
srid = None
|
|
elif srid is None or srid < 0:
|
|
raise GEOSException("Calling transform() with no SRID set is not supported")
|
|
|
|
# Creating an OGR Geometry, which is then transformed.
|
|
g = gdal.OGRGeometry(self.wkb, srid)
|
|
g.transform(ct)
|
|
# Getting a new GEOS pointer
|
|
ptr = wkb_r().read(g.wkb)
|
|
if clone:
|
|
# User wants a cloned transformed geometry returned.
|
|
return GEOSGeometry(ptr, srid=g.srid)
|
|
if ptr:
|
|
# Reassigning pointer, and performing post-initialization setup
|
|
# again due to the reassignment.
|
|
capi.destroy_geom(self.ptr)
|
|
self.ptr = ptr
|
|
self._post_init(g.srid)
|
|
else:
|
|
raise GEOSException('Transformed WKB was invalid.')
|
|
|
|
# #### Topology Routines ####
|
|
def _topology(self, gptr):
|
|
"Helper routine to return Geometry from the given pointer."
|
|
return GEOSGeometry(gptr, srid=self.srid)
|
|
|
|
@property
|
|
def boundary(self):
|
|
"Returns the boundary as a newly allocated Geometry object."
|
|
return self._topology(capi.geos_boundary(self.ptr))
|
|
|
|
def buffer(self, width, quadsegs=8):
|
|
"""
|
|
Returns a geometry that represents all points whose distance from this
|
|
Geometry is less than or equal to distance. Calculations are in the
|
|
Spatial Reference System of this Geometry. The optional third parameter sets
|
|
the number of segment used to approximate a quarter circle (defaults to 8).
|
|
(Text from PostGIS documentation at ch. 6.1.3)
|
|
"""
|
|
return self._topology(capi.geos_buffer(self.ptr, width, quadsegs))
|
|
|
|
@property
|
|
def centroid(self):
|
|
"""
|
|
The centroid is equal to the centroid of the set of component Geometries
|
|
of highest dimension (since the lower-dimension geometries contribute zero
|
|
"weight" to the centroid).
|
|
"""
|
|
return self._topology(capi.geos_centroid(self.ptr))
|
|
|
|
@property
|
|
def convex_hull(self):
|
|
"""
|
|
Returns the smallest convex Polygon that contains all the points
|
|
in the Geometry.
|
|
"""
|
|
return self._topology(capi.geos_convexhull(self.ptr))
|
|
|
|
def difference(self, other):
|
|
"""
|
|
Returns a Geometry representing the points making up this Geometry
|
|
that do not make up other.
|
|
"""
|
|
return self._topology(capi.geos_difference(self.ptr, other.ptr))
|
|
|
|
@property
|
|
def envelope(self):
|
|
"Return the envelope for this geometry (a polygon)."
|
|
return self._topology(capi.geos_envelope(self.ptr))
|
|
|
|
def intersection(self, other):
|
|
"Returns a Geometry representing the points shared by this Geometry and other."
|
|
return self._topology(capi.geos_intersection(self.ptr, other.ptr))
|
|
|
|
@property
|
|
def point_on_surface(self):
|
|
"Computes an interior point of this Geometry."
|
|
return self._topology(capi.geos_pointonsurface(self.ptr))
|
|
|
|
def relate(self, other):
|
|
"Returns the DE-9IM intersection matrix for this Geometry and the other."
|
|
return capi.geos_relate(self.ptr, other.ptr).decode()
|
|
|
|
def simplify(self, tolerance=0.0, preserve_topology=False):
|
|
"""
|
|
Returns the Geometry, simplified using the Douglas-Peucker algorithm
|
|
to the specified tolerance (higher tolerance => less points). If no
|
|
tolerance provided, defaults to 0.
|
|
|
|
By default, this function does not preserve topology - e.g. polygons can
|
|
be split, collapse to lines or disappear holes can be created or
|
|
disappear, and lines can cross. By specifying preserve_topology=True,
|
|
the result will have the same dimension and number of components as the
|
|
input. This is significantly slower.
|
|
"""
|
|
if preserve_topology:
|
|
return self._topology(capi.geos_preservesimplify(self.ptr, tolerance))
|
|
else:
|
|
return self._topology(capi.geos_simplify(self.ptr, tolerance))
|
|
|
|
def sym_difference(self, other):
|
|
"""
|
|
Returns a set combining the points in this Geometry not in other,
|
|
and the points in other not in this Geometry.
|
|
"""
|
|
return self._topology(capi.geos_symdifference(self.ptr, other.ptr))
|
|
|
|
@property
|
|
def unary_union(self):
|
|
"Return the union of all the elements of this geometry."
|
|
return self._topology(capi.geos_unary_union(self.ptr))
|
|
|
|
def union(self, other):
|
|
"Returns a Geometry representing all the points in this Geometry and other."
|
|
return self._topology(capi.geos_union(self.ptr, other.ptr))
|
|
|
|
# #### Other Routines ####
|
|
@property
|
|
def area(self):
|
|
"Returns the area of the Geometry."
|
|
return capi.geos_area(self.ptr, byref(c_double()))
|
|
|
|
def distance(self, other):
|
|
"""
|
|
Returns the distance between the closest points on this Geometry
|
|
and the other. Units will be in those of the coordinate system of
|
|
the Geometry.
|
|
"""
|
|
if not isinstance(other, GEOSGeometry):
|
|
raise TypeError('distance() works only on other GEOS Geometries.')
|
|
return capi.geos_distance(self.ptr, other.ptr, byref(c_double()))
|
|
|
|
@property
|
|
def extent(self):
|
|
"""
|
|
Returns the extent of this geometry as a 4-tuple, consisting of
|
|
(xmin, ymin, xmax, ymax).
|
|
"""
|
|
from .point import Point
|
|
env = self.envelope
|
|
if isinstance(env, Point):
|
|
xmin, ymin = env.tuple
|
|
xmax, ymax = xmin, ymin
|
|
else:
|
|
xmin, ymin = env[0][0]
|
|
xmax, ymax = env[0][2]
|
|
return (xmin, ymin, xmax, ymax)
|
|
|
|
@property
|
|
def length(self):
|
|
"""
|
|
Returns the length of this Geometry (e.g., 0 for point, or the
|
|
circumference of a Polygon).
|
|
"""
|
|
return capi.geos_length(self.ptr, byref(c_double()))
|
|
|
|
def clone(self):
|
|
"Clones this Geometry."
|
|
return GEOSGeometry(capi.geom_clone(self.ptr), srid=self.srid)
|
|
|
|
|
|
class LinearGeometryMixin(object):
|
|
"""
|
|
Used for LineString and MultiLineString.
|
|
"""
|
|
def interpolate(self, distance):
|
|
return self._topology(capi.geos_interpolate(self.ptr, distance))
|
|
|
|
def interpolate_normalized(self, distance):
|
|
return self._topology(capi.geos_interpolate_normalized(self.ptr, distance))
|
|
|
|
def project(self, point):
|
|
from .point import Point
|
|
if not isinstance(point, Point):
|
|
raise TypeError('locate_point argument must be a Point')
|
|
return capi.geos_project(self.ptr, point.ptr)
|
|
|
|
def project_normalized(self, point):
|
|
from .point import Point
|
|
if not isinstance(point, Point):
|
|
raise TypeError('locate_point argument must be a Point')
|
|
return capi.geos_project_normalized(self.ptr, point.ptr)
|
|
|
|
@property
|
|
def merged(self):
|
|
"""
|
|
Return the line merge of this Geometry.
|
|
"""
|
|
return self._topology(capi.geos_linemerge(self.ptr))
|
|
|
|
@property
|
|
def closed(self):
|
|
"""
|
|
Return whether or not this Geometry is closed.
|
|
"""
|
|
return capi.geos_isclosed(self.ptr)
|