app/django/contrib/gis/geos/geometries.py
author Sverre Rabbelier <sverre@rabbelier.nl>
Mon, 07 Sep 2009 20:27:37 +0200
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"""
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 This module houses the Point, LineString, LinearRing, and Polygon OGC
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 geometry classes.  All geometry classes in this module inherit from 
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 GEOSGeometry.
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"""
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from ctypes import c_uint, byref
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from django.contrib.gis.geos.base import GEOSGeometry
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from django.contrib.gis.geos.coordseq import GEOSCoordSeq
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from django.contrib.gis.geos.error import GEOSException, GEOSIndexError
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from django.contrib.gis.geos.libgeos import get_pointer_arr, GEOM_PTR, HAS_NUMPY
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from django.contrib.gis.geos.prototypes import *
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if HAS_NUMPY: from numpy import ndarray, array
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class Point(GEOSGeometry):
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    def __init__(self, x, y=None, z=None, srid=None):
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        """
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        The Point object may be initialized with either a tuple, or individual
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        parameters.
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        For Example:
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        >>> p = Point((5, 23)) # 2D point, passed in as a tuple
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        >>> p = Point(5, 23, 8) # 3D point, passed in with individual parameters
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        """
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        if isinstance(x, (tuple, list)):
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            # Here a tuple or list was passed in under the `x` parameter.
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            ndim = len(x)
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            if ndim < 2 or ndim > 3:
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                raise TypeError('Invalid sequence parameter: %s' % str(x))
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            coords = x
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        elif isinstance(x, (int, float, long)) and isinstance(y, (int, float, long)):
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            # Here X, Y, and (optionally) Z were passed in individually, as parameters.
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            if isinstance(z, (int, float, long)):
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                ndim = 3
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                coords = [x, y, z]
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            else:
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                ndim = 2
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                coords = [x, y]
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        else:
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            raise TypeError('Invalid parameters given for Point initialization.')
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        # Creating the coordinate sequence, and setting X, Y, [Z]
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        cs = create_cs(c_uint(1), c_uint(ndim))
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        cs_setx(cs, 0, coords[0])
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        cs_sety(cs, 0, coords[1])
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        if ndim == 3: cs_setz(cs, 0, coords[2])
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        # Initializing using the address returned from the GEOS 
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        #  createPoint factory.
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        super(Point, self).__init__(create_point(cs), srid=srid)
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    def __len__(self):
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        "Returns the number of dimensions for this Point (either 0, 2 or 3)."
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        if self.empty: return 0
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        if self.hasz: return 3
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        else: return 2
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    def get_x(self):
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        "Returns the X component of the Point."
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        return self._cs.getOrdinate(0, 0)
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    def set_x(self, value):
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        "Sets the X component of the Point."
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        self._cs.setOrdinate(0, 0, value)
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    def get_y(self):
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        "Returns the Y component of the Point."
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        return self._cs.getOrdinate(1, 0)
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    def set_y(self, value):
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        "Sets the Y component of the Point."
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        self._cs.setOrdinate(1, 0, value)
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    def get_z(self):
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        "Returns the Z component of the Point."
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        if self.hasz:
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            return self._cs.getOrdinate(2, 0)
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        else:
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            return None
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    def set_z(self, value):
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        "Sets the Z component of the Point."
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        if self.hasz:
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            self._cs.setOrdinate(2, 0, value)
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        else:
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            raise GEOSException('Cannot set Z on 2D Point.')
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    # X, Y, Z properties
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    x = property(get_x, set_x)
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    y = property(get_y, set_y)
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    z = property(get_z, set_z)
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    ### Tuple setting and retrieval routines. ###
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    def get_coords(self):
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        "Returns a tuple of the point."
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        return self._cs.tuple
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    def set_coords(self, tup):
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        "Sets the coordinates of the point with the given tuple."
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        self._cs[0] = tup
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    # The tuple and coords properties
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    tuple = property(get_coords, set_coords)
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    coords = tuple
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class LineString(GEOSGeometry):
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    #### Python 'magic' routines ####
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    def __init__(self, *args, **kwargs):
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        """
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        Initializes on the given sequence -- may take lists, tuples, NumPy arrays
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        of X,Y pairs, or Point objects.  If Point objects are used, ownership is
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        _not_ transferred to the LineString object.
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        Examples:
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         ls = LineString((1, 1), (2, 2))
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         ls = LineString([(1, 1), (2, 2)])
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         ls = LineString(array([(1, 1), (2, 2)]))
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         ls = LineString(Point(1, 1), Point(2, 2))
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        """
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        # If only one argument provided, set the coords array appropriately
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        if len(args) == 1: coords = args[0]
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        else: coords = args
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        if isinstance(coords, (tuple, list)):
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            # Getting the number of coords and the number of dimensions -- which
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            #  must stay the same, e.g., no LineString((1, 2), (1, 2, 3)).
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            ncoords = len(coords)
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            if coords: ndim = len(coords[0])
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            else: raise TypeError('Cannot initialize on empty sequence.')
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            self._checkdim(ndim)
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            # Incrementing through each of the coordinates and verifying
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            for i in xrange(1, ncoords):
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                if not isinstance(coords[i], (tuple, list, Point)):
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                    raise TypeError('each coordinate should be a sequence (list or tuple)')
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                if len(coords[i]) != ndim: raise TypeError('Dimension mismatch.')
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            numpy_coords = False
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        elif HAS_NUMPY and isinstance(coords, ndarray):
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            shape = coords.shape # Using numpy's shape.
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            if len(shape) != 2: raise TypeError('Too many dimensions.')
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            self._checkdim(shape[1])
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            ncoords = shape[0]
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            ndim = shape[1]
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            numpy_coords = True
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        else:
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            raise TypeError('Invalid initialization input for LineStrings.')
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        # Creating a coordinate sequence object because it is easier to 
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        #  set the points using GEOSCoordSeq.__setitem__().
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        cs = GEOSCoordSeq(create_cs(ncoords, ndim), z=bool(ndim==3))
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        for i in xrange(ncoords):
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            if numpy_coords: cs[i] = coords[i,:]
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            elif isinstance(coords[i], Point): cs[i] = coords[i].tuple
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            else: cs[i] = coords[i]        
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        # Getting the correct initialization function
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        if kwargs.get('ring', False):
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            func = create_linearring
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        else:
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            func = create_linestring
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        # If SRID was passed in with the keyword arguments
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        srid = kwargs.get('srid', None)
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        # Calling the base geometry initialization with the returned pointer 
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        #  from the function.
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        super(LineString, self).__init__(func(cs.ptr), srid=srid)
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    def __getitem__(self, index):
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        "Gets the point at the specified index."
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        return self._cs[index]
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    def __setitem__(self, index, value):
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        "Sets the point at the specified index, e.g., line_str[0] = (1, 2)."
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        self._cs[index] = value
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    def __iter__(self):
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        "Allows iteration over this LineString."
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        for i in xrange(len(self)):
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            yield self[i]
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    def __len__(self):
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        "Returns the number of points in this LineString."
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        return len(self._cs)
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    def _checkdim(self, dim):
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        if dim not in (2, 3): raise TypeError('Dimension mismatch.')
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    #### Sequence Properties ####
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    @property
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    def tuple(self):
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        "Returns a tuple version of the geometry from the coordinate sequence."
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        return self._cs.tuple
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    coords = tuple
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    def _listarr(self, func):
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        """
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        Internal routine that returns a sequence (list) corresponding with
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        the given function.  Will return a numpy array if possible.
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        """
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        lst = [func(i) for i in xrange(len(self))]
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        if HAS_NUMPY: return array(lst) # ARRRR!
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        else: return lst
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    @property
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    def array(self):
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        "Returns a numpy array for the LineString."
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        return self._listarr(self._cs.__getitem__)
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    @property
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    def x(self):
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        "Returns a list or numpy array of the X variable."
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        return self._listarr(self._cs.getX)
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    @property
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    def y(self):
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        "Returns a list or numpy array of the Y variable."
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        return self._listarr(self._cs.getY)
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    @property
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    def z(self):
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        "Returns a list or numpy array of the Z variable."
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        if not self.hasz: return None
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        else: return self._listarr(self._cs.getZ)
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# LinearRings are LineStrings used within Polygons.
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class LinearRing(LineString):
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    def __init__(self, *args, **kwargs):
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        "Overriding the initialization function to set the ring keyword."
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        kwargs['ring'] = True # Setting the ring keyword argument to True
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        super(LinearRing, self).__init__(*args, **kwargs)
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class Polygon(GEOSGeometry):
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    def __init__(self, *args, **kwargs):
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        """
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        Initializes on an exterior ring and a sequence of holes (both
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        instances may be either LinearRing instances, or a tuple/list
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        that may be constructed into a LinearRing).
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        Examples of initialization, where shell, hole1, and hole2 are 
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        valid LinearRing geometries:
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        >>> poly = Polygon(shell, hole1, hole2)
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        >>> poly = Polygon(shell, (hole1, hole2))
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        Example where a tuple parameters are used:
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        >>> poly = Polygon(((0, 0), (0, 10), (10, 10), (0, 10), (0, 0)), 
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                           ((4, 4), (4, 6), (6, 6), (6, 4), (4, 4)))
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        """
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        if not args:
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            raise TypeError('Must provide at list one LinearRing instance to initialize Polygon.')
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        # Getting the ext_ring and init_holes parameters from the argument list
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        ext_ring = args[0]
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        init_holes = args[1:]
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        n_holes = len(init_holes)
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        # If initialized as Polygon(shell, (LinearRing, LinearRing)) [for backward-compatibility]
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        if n_holes == 1 and isinstance(init_holes[0], (tuple, list)) and \
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                (len(init_holes[0]) == 0 or isinstance(init_holes[0][0], LinearRing)): 
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            init_holes = init_holes[0]
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            n_holes = len(init_holes)
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        # Ensuring the exterior ring and holes parameters are LinearRing objects
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        # or may be instantiated into LinearRings.
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        ext_ring = self._construct_ring(ext_ring, 'Exterior parameter must be a LinearRing or an object that can initialize a LinearRing.')
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        holes_list = [] # Create new list, cause init_holes is a tuple.
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        for i in xrange(n_holes):
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            holes_list.append(self._construct_ring(init_holes[i], 'Holes parameter must be a sequence of LinearRings or objects that can initialize to LinearRings'))
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        # Why another loop?  Because if a TypeError is raised, cloned pointers will
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        # be around that can't be cleaned up.
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        holes = get_pointer_arr(n_holes)
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        for i in xrange(n_holes): holes[i] = geom_clone(holes_list[i].ptr)
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        # Getting the shell pointer address.
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        shell = geom_clone(ext_ring.ptr)
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        # Calling with the GEOS createPolygon factory.
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        super(Polygon, self).__init__(create_polygon(shell, byref(holes), c_uint(n_holes)), **kwargs)
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    def __getitem__(self, index):
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        """
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        Returns the ring at the specified index.  The first index, 0, will 
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        always return the exterior ring.  Indices > 0 will return the 
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        interior ring at the given index (e.g., poly[1] and poly[2] would
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        return the first and second interior ring, respectively).
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        """
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        if index == 0:
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            return self.exterior_ring
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        else:
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            # Getting the interior ring, have to subtract 1 from the index.
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            return self.get_interior_ring(index-1) 
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    def __setitem__(self, index, ring):
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        "Sets the ring at the specified index with the given ring."
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        # Checking the index and ring parameters.
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        self._checkindex(index)
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        if not isinstance(ring, LinearRing):
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            raise TypeError('must set Polygon index with a LinearRing object')
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        # Getting the shell
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        if index == 0:
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            shell = geom_clone(ring.ptr)
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        else:
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            shell = geom_clone(get_extring(self.ptr))
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        # Getting the interior rings (holes)
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        nholes = len(self)-1
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        if nholes > 0:
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            holes = get_pointer_arr(nholes)
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            for i in xrange(nholes):
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                if i == (index-1):
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                    holes[i] = geom_clone(ring.ptr)
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                else:
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                    holes[i] = geom_clone(get_intring(self.ptr, i))
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            holes_param = byref(holes)
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        else:
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            holes_param = None
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        # Getting the current pointer, replacing with the newly constructed
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        # geometry, and destroying the old geometry.
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        prev_ptr = self.ptr
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        srid = self.srid
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        self._ptr = create_polygon(shell, holes_param, c_uint(nholes))
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        if srid: self.srid = srid
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        destroy_geom(prev_ptr)
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    def __iter__(self):
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        "Iterates over each ring in the polygon."
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        for i in xrange(len(self)):
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            yield self[i]
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    def __len__(self):
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        "Returns the number of rings in this Polygon."
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        return self.num_interior_rings + 1
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    def _checkindex(self, index):
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        "Internal routine for checking the given ring index."
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        if index < 0 or index >= len(self):
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            raise GEOSIndexError('invalid Polygon ring index: %s' % index)
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   343
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    def _construct_ring(self, param, msg=''):
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        "Helper routine for trying to construct a ring from the given parameter."
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        if isinstance(param, LinearRing): return param
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        try:
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            ring = LinearRing(param)
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            return ring
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        except TypeError:
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            raise TypeError(msg)
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    def get_interior_ring(self, ring_i):
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        """
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        Gets the interior ring at the specified index, 0 is for the first 
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        interior ring, not the exterior ring.
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        """
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        self._checkindex(ring_i+1)
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        return GEOSGeometry(geom_clone(get_intring(self.ptr, ring_i)), srid=self.srid)
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   360
                                                        
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   361
    #### Polygon Properties ####
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   362
    @property
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   363
    def num_interior_rings(self):
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   364
        "Returns the number of interior rings."
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   365
        # Getting the number of rings
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   366
        return get_nrings(self.ptr)
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   367
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   368
    def get_ext_ring(self):
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   369
        "Gets the exterior ring of the Polygon."
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   370
        return GEOSGeometry(geom_clone(get_extring(self.ptr)), srid=self.srid)
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   371
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   372
    def set_ext_ring(self, ring):
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   373
        "Sets the exterior ring of the Polygon."
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   374
        self[0] = ring
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   375
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   376
    # properties for the exterior ring/shell
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   377
    exterior_ring = property(get_ext_ring, set_ext_ring)
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   378
    shell = exterior_ring
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   379
    
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   380
    @property
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   381
    def tuple(self):
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   382
        "Gets the tuple for each ring in this Polygon."
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   383
        return tuple([self[i].tuple for i in xrange(len(self))])
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   384
    coords = tuple
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   385
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   386
    @property
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   387
    def kml(self):
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   388
        "Returns the KML representation of this Polygon."
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   389
        inner_kml = ''.join(["<innerBoundaryIs>%s</innerBoundaryIs>" % self[i+1].kml 
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   390
                             for i in xrange(self.num_interior_rings)])
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   391
        return "<Polygon><outerBoundaryIs>%s</outerBoundaryIs>%s</Polygon>" % (self[0].kml, inner_kml)