Python forms.GeometryField方法代码示例

# 需要导入模块: from django.contrib.gis import forms [as 别名]
# 或者: from django.contrib.gis.forms import GeometryField [as 别名]
def __init__(self, verbose_name=None, dim=2, geography=False, **kwargs):
        """
        The initialization function for geometry fields. In addition to the
        parameters from BaseSpatialField, it takes the following as keyword
        arguments:

        dim:
         The number of dimensions for this geometry.  Defaults to 2.

        extent:
         Customize the extent, in a 4-tuple of WGS 84 coordinates, for the
         geometry field entry in the `USER_SDO_GEOM_METADATA` table.  Defaults
         to (-180.0, -90.0, 180.0, 90.0).

        tolerance:
         Define the tolerance, in meters, to use for the geometry field
         entry in the `USER_SDO_GEOM_METADATA` table.  Defaults to 0.05.
        """
        # Setting the dimension of the geometry field.
        self.dim = dim

        # Is this a geography rather than a geometry column?
        self.geography = geography

        # Oracle-specific private attributes for creating the entry in
        # `USER_SDO_GEOM_METADATA`
        self._extent = kwargs.pop('extent', (-180.0, -90.0, 180.0, 90.0))
        self._tolerance = kwargs.pop('tolerance', 0.05)

        super(GeometryField, self).__init__(verbose_name=verbose_name, **kwargs) 

# 需要导入模块: from django.contrib.gis import forms [as 别名]
# 或者: from django.contrib.gis.forms import GeometryField [as 别名]
def deconstruct(self):
        name, path, args, kwargs = super(GeometryField, self).deconstruct()
        # Include kwargs if they're not the default values.
        if self.dim != 2:
            kwargs['dim'] = self.dim
        if self.geography is not False:
            kwargs['geography'] = self.geography
        return name, path, args, kwargs

    # ### Routines specific to GeometryField ### 

# 需要导入模块: from django.contrib.gis import forms [as 别名]
# 或者: from django.contrib.gis.forms import GeometryField [as 别名]
def get_prep_value(self, value):
        """
        Spatial lookup values are either a parameter that is (or may be
        converted to) a geometry, or a sequence of lookup values that
        begins with a geometry.  This routine will setup the geometry
        value properly, and preserve any other lookup parameters before
        returning to the caller.
        """
        value = super(GeometryField, self).get_prep_value(value)
        if isinstance(value, Expression):
            return value
        elif isinstance(value, (tuple, list)):
            geom = value[0]
            seq_value = True
        else:
            geom = value
            seq_value = False

        # When the input is not a GEOS geometry, attempt to construct one
        # from the given string input.
        if isinstance(geom, Geometry):
            pass
        elif isinstance(geom, (bytes, six.string_types)) or hasattr(geom, '__geo_interface__'):
            try:
                geom = Geometry(geom)
            except GeometryException:
                raise ValueError('Could not create geometry from lookup value.')
        else:
            raise ValueError('Cannot use object with type %s for a geometry lookup parameter.' % type(geom).__name__)

        # Assigning the SRID value.
        geom.srid = self.get_srid(geom)

        if seq_value:
            lookup_val = [geom]
            lookup_val.extend(value[1:])
            return tuple(lookup_val)
        else:
            return geom 

# 需要导入模块: from django.contrib.gis import forms [as 别名]
# 或者: from django.contrib.gis.forms import GeometryField [as 别名]
def contribute_to_class(self, cls, name, **kwargs):
        super(GeometryField, self).contribute_to_class(cls, name, **kwargs)

        # Setup for lazy-instantiated Geometry object.
        setattr(cls, self.attname, SpatialProxy(Geometry, self)) 

# 需要导入模块: from django.contrib.gis import forms [as 别名]
# 或者: from django.contrib.gis.forms import GeometryField [as 别名]
def formfield(self, **kwargs):
        defaults = {'form_class': self.form_class,
                    'geom_type': self.geom_type,
                    'srid': self.srid,
                    }
        defaults.update(kwargs)
        if (self.dim > 2 and 'widget' not in kwargs and
                not getattr(defaults['form_class'].widget, 'supports_3d', False)):
            defaults['widget'] = forms.Textarea
        return super(GeometryField, self).formfield(**defaults) 

# 需要导入模块: from django.contrib.gis import forms [as 别名]
# 或者: from django.contrib.gis.forms import GeometryField [as 别名]
def get_db_prep_value(self, value, connection, *args, **kwargs):
        return connection.ops.Adapter(
            super(GeometryField, self).get_db_prep_value(value, connection, *args, **kwargs),
            **({'geography': True} if self.geography else {})
        ) 

# 需要导入模块: from django.contrib.gis import forms [as 别名]
# 或者: from django.contrib.gis.forms import GeometryField [as 别名]
def deconstruct(self):
        name, path, args, kwargs = super(GeometryField, self).deconstruct()
        # Always include SRID for less fragility; include others if they're
        # not the default values.
        kwargs['srid'] = self.srid
        if self.dim != 2:
            kwargs['dim'] = self.dim
        if self.spatial_index is not True:
            kwargs['spatial_index'] = self.spatial_index
        if self.geography is not False:
            kwargs['geography'] = self.geography
        return name, path, args, kwargs

    # The following functions are used to get the units, their name, and
    # the spheroid corresponding to the SRID of the GeometryField. 

# 需要导入模块: from django.contrib.gis import forms [as 别名]
# 或者: from django.contrib.gis.forms import GeometryField [as 别名]
def units_name(self, connection):
        if not hasattr(self, '_units_name'):
            self._get_srid_info(connection)
        return self._units_name

    # ### Routines specific to GeometryField ### 

# 需要导入模块: from django.contrib.gis import forms [as 别名]
# 或者: from django.contrib.gis.forms import GeometryField [as 别名]
def contribute_to_class(self, cls, name, **kwargs):
        super(GeometryField, self).contribute_to_class(cls, name, **kwargs)

        # Setup for lazy-instantiated Geometry object.
        setattr(cls, self.attname, GeometryProxy(Geometry, self)) 

# 需要导入模块: from django.contrib.gis import forms [as 别名]
# 或者: from django.contrib.gis.forms import GeometryField [as 别名]
def get_prep_lookup(self, lookup_type, value):
        if lookup_type == 'contains':
            # 'contains' name might conflict with the "normal" contains lookup,
            # for which the value is not prepared, but left as-is.
            return self.get_prep_value(value)
        return super(GeometryField, self).get_prep_lookup(lookup_type, value)