# -*- coding: utf-8 -*-
"""
Created on Tue Jul 31 13:06:20 2012
@author: pietro
"""
import ctypes
import grass.lib.vector as libvect
from collections import Iterable
from grass.pygrass.shell.conversion import dict2html
[docs]class Bbox(object):
"""Instantiate a Bounding Box class that contains
a ctypes pointer to the C struct bound_box, that could be used
by C GRASS functions.
>>> bbox = Bbox()
>>> bbox
Bbox(0.0, 0.0, 0.0, 0.0)
The default parameters are 0. It is possible to set or change
the parameters later, with:
>>> bbox.north = 10
>>> bbox.south = -10
>>> bbox.east = -20
>>> bbox.west = 20
>>> bbox
Bbox(10.0, -10.0, -20.0, 20.0)
Or directly istantiate the class with the values, with:
>>> bbox = Bbox(north=100, south=0, east=0, west=100)
>>> bbox
Bbox(100.0, 0.0, 0.0, 100.0)
..
"""
def __init__(self, north=0, south=0, east=0, west=0, top=0, bottom=0):
self.c_bbox = ctypes.pointer(libvect.bound_box())
self.north = north
self.south = south
self.east = east
self.west = west
self.top = top
self.bottom = bottom
def _get_n(self):
"""Private method to obtain the north value"""
return self.c_bbox.contents.N
def _set_n(self, value):
"""Private method to set the north value"""
self.c_bbox.contents.N = value
north = property(fget=_get_n, fset=_set_n,
doc="Set and obtain north value")
def _get_s(self):
"""Private method to obtain the south value"""
return self.c_bbox.contents.S
def _set_s(self, value):
"""Private method to set the south value"""
self.c_bbox.contents.S = value
south = property(fget=_get_s, fset=_set_s,
doc="Set and obtain south value")
def _get_e(self):
"""Private method to obtain the east value"""
return self.c_bbox.contents.E
def _set_e(self, value):
"""Private method to set the east value"""
self.c_bbox.contents.E = value
east = property(fget=_get_e, fset=_set_e,
doc="Set and obtain east value")
def _get_w(self):
"""Private method to obtain the west value"""
return self.c_bbox.contents.W
def _set_w(self, value):
"""Private method to set the west value"""
self.c_bbox.contents.W = value
west = property(fget=_get_w, fset=_set_w,
doc="Set and obtain west value")
def _get_t(self):
"""Private method to obtain the top value"""
return self.c_bbox.contents.T
def _set_t(self, value):
"""Private method to set the top value"""
self.c_bbox.contents.T = value
top = property(fget=_get_t, fset=_set_t,
doc="Set and obtain top value")
def _get_b(self):
"""Private method to obtain the bottom value"""
return self.c_bbox.contents.B
def _set_b(self, value):
"""Private method to set the bottom value"""
self.c_bbox.contents.B = value
bottom = property(fget=_get_b, fset=_set_b,
doc="Set and obtain bottom value")
def __repr__(self):
return "Bbox({n}, {s}, {e}, {w})".format(n=self.north, s=self.south,
e=self.east, w=self.west)
def _repr_html_(self):
return dict2html(dict(self.items()), keys=self.keys(),
border='1', kdec='b')
[docs] def contains(self, point):
"""Return True if the object is contained by the BoundingBox
:param point: the point to analyze
:type point: a Point object or a tuple with the coordinates
>>> from grass.pygrass.vector.geometry import Point
>>> poi = Point(5,5)
>>> bbox = Bbox(north=10, south=0, west=0, east=10)
>>> bbox.contains(poi)
True
"""
return bool(libvect.Vect_point_in_box(point.x, point.y,
point.z if point.z else 0,
self.c_bbox))
[docs] def nsewtb(self, tb=True):
"""Return a list of values from bounding box
:param tb: if tb parameter is False return only: north, south, east,
west and not top and bottom
:type tb: bool
"""
if tb:
return (self.north, self.south, self.east, self.west,
self.top, self.bottom)
else:
return (self.north, self.south, self.east, self.west)
[docs]class BoxList(object):
"""Instantiate a BoxList class to create a list of Bounding Box"""
def __init__(self, boxlist=None):
self.c_boxlist = ctypes.pointer(libvect.boxlist())
# if set to 0, the list will hold only ids and no boxes
self.c_boxlist.contents.have_boxes = 1
if boxlist is not None:
for box in boxlist:
self.append(box)
@property
@property
def __len__(self):
return self.c_boxlist.contents.n_values
def __repr__(self):
return "Boxlist([%s])" % ", ".join([repr(box)
for box in self.__iter__()])
def __getitem__(self, indx):
bbox = Bbox()
bbox.c_bbox = ctypes.pointer(self.c_boxlist.contents.box[indx])
return bbox
def __setitem__(self, indx, bbox):
self.c_boxlist.contents.box[indx] = bbox
def __iter__(self):
return (self.__getitem__(box_id) for box_id in range(self.__len__()))
def __str__(self):
return self.__repr__()
[docs] def append(self, box):
"""Append a Bbox object to a Boxlist object, using the
``Vect_boxlist_append`` C function.
:param bbox: the bounding box to add to the list
:param bbox: a Bbox object
>>> box0 = Bbox()
>>> box1 = Bbox(1,2,3,4)
>>> box2 = Bbox(5,6,7,8)
>>> boxlist = BoxList([box0, box1])
>>> boxlist
Boxlist([Bbox(0.0, 0.0, 0.0, 0.0), Bbox(1.0, 2.0, 3.0, 4.0)])
>>> len(boxlist)
2
>>> boxlist.append(box2)
>>> len(boxlist)
3
"""
indx = self.__len__()
libvect.Vect_boxlist_append(self.c_boxlist, indx, box.c_bbox)
# def extend(self, boxlist):
# """Extend a boxlist with another boxlist or using a list of Bbox, using
# ``Vect_boxlist_append_boxlist`` c function. ::
#
# >>> box0 = Bbox()
# >>> box1 = Bbox(1,2,3,4)
# >>> box2 = Bbox(5,6,7,8)
# >>> box3 = Bbox(9,8,7,6)
# >>> boxlist0 = BoxList([box0, box1])
# >>> boxlist0
# Boxlist([Bbox(0.0, 0.0, 0.0, 0.0), Bbox(1.0, 2.0, 3.0, 4.0)])
# >>> boxlist1 = BoxList([box2, box3])
# >>> len(boxlist0)
# 2
# >>> boxlist0.extend(boxlist1)
# >>> len(boxlist0)
# 4
# >>> boxlist1.extend([box0, box1])
# >>> len(boxlist1)
# 4
#
# ..
# """
# if hasattr(boxlist, 'c_boxlist'):
# #import pdb; pdb.set_trace()
# # FIXME: doesn't work
# libvect.Vect_boxlist_append_boxlist(self.c_boxlist,
# boxlist.c_boxlist)
# else:
# for box in boxlist:
# self.append(box)
[docs] def remove(self, indx):
"""Remove Bbox from the boxlist, given an integer or a list of integer
or a boxlist, using ``Vect_boxlist_delete`` C function or the
``Vect_boxlist_delete_boxlist``.
:param indx: the index value of the Bbox to remove
:param indx: int
>>> boxlist = BoxList([Bbox(),
... Bbox(1, 0, 0, 1),
... Bbox(1, -1, -1, 1)])
>>> boxlist.remove(0)
>>> boxlist
Boxlist([Bbox(1.0, 0.0, 0.0, 1.0), Bbox(1.0, -1.0, -1.0, 1.0)])
"""
if hasattr(indx, 'c_boxlist'):
libvect.Vect_boxlist_delete_boxlist(self.c_boxlist, indx.c_boxlist)
elif isinstance(indx, int):
libvect.Vect_boxlist_delete(self.c_boxlist, indx)
else:
for ind in indx:
libvect.Vect_boxlist_delete(self.c_boxlist, ind)
[docs] def reset(self):
"""Reset the c_boxlist C struct, using the ``Vect_reset_boxlist`` C
function.
>>> boxlist = BoxList([Bbox(),
... Bbox(1, 0, 0, 1),
... Bbox(1, -1, -1, 1)])
>>> len(boxlist)
3
>>> boxlist.reset()
>>> len(boxlist)
0
"""
libvect.Vect_reset_boxlist(self.c_boxlist)
[docs]class Ilist(object):
"""Instantiate a list of integer using the C GRASS struct ``ilist``,
the class contains this struct as ``c_ilist`` attribute. """
def __init__(self, integer_list=None):
self.c_ilist = ctypes.pointer(libvect.struct_ilist())
if integer_list is not None:
self.extend(integer_list)
def __getitem__(self, key):
if isinstance(key, slice):
#import pdb; pdb.set_trace()
#Get the start, stop, and step from the slice
return [self.c_ilist.contents.value[indx]
for indx in range(*key.indices(len(self)))]
elif isinstance(key, int):
if key < 0: # Handle negative indices
key += self.c_ilist.contents.n_values
if key >= self.c_ilist.contents.n_values:
raise IndexError('Index out of range')
return self.c_ilist.contents.value[key]
else:
raise ValueError("Invalid argument type: %r." % key)
def __setitem__(self, key, value):
if self.contains(value):
raise ValueError('Integer already in the list')
self.c_ilist.contents.value[key] = int(value)
def __len__(self):
return self.c_ilist.contents.n_values
def __iter__(self):
return (self.c_ilist.contents.value[i] for i in range(self.__len__()))
def __repr__(self):
return "Ilist(%r)" % [i for i in self.__iter__()]
def __contains__(self, item):
return item in self.__iter__()
[docs] def append(self, value):
"""Append an integer to the list"""
if libvect.Vect_list_append(self.c_ilist, value):
raise # TODO
[docs] def extend(self, ilist):
"""Extend the list with another Ilist object or
with a list of integers
:param ilist: the ilist to append
:type ilist: a Ilist object
"""
if isinstance(ilist, Ilist):
libvect.Vect_list_append_list(self.c_ilist, ilist.ilist)
else:
for i in ilist:
self.append(i)
[docs] def remove(self, value):
"""Remove a value from a list"""
if isinstance(value, int):
libvect.Vect_list_delete(self.c_ilist, value)
elif isinstance(value, Ilist):
libvect.Vect_list_delete_list(self.c_ilist, value.ilist)
elif isinstance(value, Iterable):
for i in value:
libvect.Vect_list_delete(self.c_ilist, int(i))
else:
raise ValueError('Value: %r, is not supported' % value)
[docs] def contains(self, value):
"""Check if value is in the list"""
return bool(libvect.Vect_val_in_list(self.c_ilist, value))
[docs]class Cats(object):
"""Instantiate a Category class that contains a ctypes pointer
to the C line_cats struct.
>>> cats = Cats()
>>> for cat in xrange(100, 110): cats.set(cat, layer=cat-50)
>>> cats.n_cats
10
>>> cats.cat
[100, 101, 102, 103, 104, 105, 106, 107, 108, 109]
>>> cats.layer
[50, 51, 52, 53, 54, 55, 56, 57, 58, 59]
>>> cats.get() # default layer is 1
(-1, 0)
>>> cats.get(50)
(100, 1)
>>> cats.get(51)
(101, 1)
>>> cats.set(1001, 52)
>>> cats.cat
[100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 1001]
>>> cats.layer
[50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 52]
>>> cats.get(52)
(102, 2)
>>> cats.reset()
>>> cats.layer
[]
>>> cats.cat
[]
"""
@property
[docs] def layer(self):
field = self.c_cats.contents.field
return [field[i] for i in range(self.n_cats)]
@property
@property
def __init__(self, c_cats=None):
self.c_cats = c_cats if c_cats else ctypes.pointer(libvect.line_cats())
[docs] def reset(self):
"""Reset the C cats struct from previous values."""
libvect.Vect_reset_cats(self.c_cats)
[docs] def get(self, layer=1):
"""Return the first found category of given layer
and the number of category found.
:param layer: the number of layer
:type layer: int
"""
cat = ctypes.c_int()
n_cats = libvect.Vect_cat_get(self.c_cats, layer, ctypes.byref(cat))
return cat.value, n_cats
[docs] def set(self, cat, layer=1):
"""Add new field/cat to category structure if doesn't exist yet.
:param cat: the cat to add
:type cat: int
:param layer: the number of layer
:type layer: int
"""
libvect.Vect_cat_set(self.c_cats, layer, cat)
[docs] def delete(self, cat=None, layer=1):
"""If cat is given delete cat from line_cats structure
(using Vect_field_cat_del) else delete all categories of given layer
(using Vect_cat_del).
:param cat: the cat to add
:type cat: int
:param layer: the number of layer
:type layer: int
"""
if cat:
self.n_del = libvect.Vect_field_cat_del(self.c_cats, layer, cat)
err_msg = "Layer(%d)/category(%d) number does not exist"
err_msg = err_msg % (layer, cat)
else:
self.n_del = libvect.Vect_cat_del(self.c_cats, layer)
err_msg = 'Layer: %r does not exist' % layer
if self.n_del == 0:
raise ValueError(err_msg)
[docs] def check_cats_constraints(self, cats_list, layer=1):
"""Check if categories match with category constraints
:param cats_list: a list of categories
:type cats_list: list
:param layer: the number of layer
:type layer: int
"""
return bool(libvect.Vect_cats_in_constraint(self.c_cats, layer,
cats_list.c_cat_list))
[docs] def get_list(self, layer=1):
"""Get list of categories of given field.
:param layer: the number of layer
:type layer: int
"""
ilist = Ilist()
if libvect.Vect_field_cat_get(self.c_cats, layer,
ilist.c_ilist) < 0:
raise ValueError('Layer: %r does not exist' % layer)
return ilist
[docs]class CatsList(object):
"""
>>> cats_list = CatsList()
>>> cats_list.min
[]
>>> cats_list.max
[]
>>> cats_list.n_ranges
0
>>> cats_list.layer
0
>>> string = "2,3,5-9,20"
>>> cats_list.from_string(string)
>>> cats_list.min
[2, 3, 5, 20]
>>> cats_list.max
[2, 3, 9, 20]
>>> cats_list.n_ranges
4
"""
@property
@property
@property
[docs] def min(self):
"""Return the minimum value"""
min_values = self.c_cat_list.contents.min
return [min_values[i] for i in range(self.n_ranges)]
@property
[docs] def max(self):
"""Return the maximum value"""
max_values = self.c_cat_list.contents.max
return [max_values[i] for i in range(self.n_ranges)]
def __init__(self, c_cat_list=None):
self.c_cat_list = c_cat_list if c_cat_list \
else ctypes.pointer(libvect.cat_list())
[docs] def from_string(self, string):
"""Converts string of categories and cat ranges separated by commas
to cat_list.
:param string: a string containing the cats separated by commas
:type string: str
"""
num_errors = libvect.Vect_str_to_cat_list(string, self.c_cat_list)
if num_errors:
from grass.pygrass.errors import GrassError
raise GrassError("%d number of errors in ranges" % num_errors)
[docs] def from_array(self, array):
"""Convert ordered array of integers to cat_list structure.
:param array: the input array containing the cats
:type array: array
"""
# Vect_array_to_cat_list(const int *vals, int nvals, ***)
# TODO: it's not working
libvect.Vect_array_to_cat_list(array, len(array), self.c_cat_list)
def __contains__(self, cat):
"""Check if category number is in list.
:param cat: the category number
:type cat: int
"""
return bool(libvect.Vect_cat_in_cat_list(cat, self.c_cat_list))
if __name__ == "__main__":
import doctest
doctest.testmod()
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