class DVA(Algorithm):
# noinspection PyMissingConstructor
def __init__(self, dist_multiplier=1.0):
if dist_multiplier < 1.0:
raise Exception('dist_multiplier cannot be lower than 1.0')
self.graph = Graph()
self.dist_multiplier = dist_multiplier
def add_point(self, point: Point):
# This list contains tuples of points and distances to them : (distance, point)
list_distances = self.graph.get_distance_to(point)
# If graph is empty we don't need to do any specific operations but adding point
if len(list_distances) == 0:
self.graph.add_point(point, set())
return
# Get nearest point
num_nearest_distance = list_distances[0][0]
# Get list of new neighbors of point
filter_tuples = filter(
lambda x: x[0] <= num_nearest_distance * self.dist_multiplier,
list_distances)
list_neighbors = list(filter_tuples)
map_neighbors = map(lambda x: x[1], list_neighbors)
set_neighbors = set(map_neighbors)
# Add point and its neighbors to graph
self.graph.add_point(point, set_neighbors)
def delete_point(self, point: Point):
# Get list of points which connections is needed to correct
list_neighbors = self.graph.get_neighbours_list(point)
if len(list_neighbors) == 0:
self.graph.remove_point(point)
return
map_neighbors = map(lambda x: x[1], list_neighbors)
list_points_to_correct = list(map_neighbors)
# Remove point
self.graph.remove_point(point)
# Correct graph structure
self.__correct_graph_structure(list_points_to_correct)
def find_nearest_to(self, point: Point):
set_a = set(self.graph.get_points())
point_current = set_a.pop()
num_current_distance = point.distance_to(point_current)
list_neighbors = self.graph.get_neighbours_list(point_current)
while len(list_neighbors) != 0:
# Get shortest distance among neighbors
list_distances = list(
map(lambda x: x[1].distance_to(point), list_neighbors))
num_new_distance = min(list_distances)
if num_current_distance < num_new_distance:
return point_current
# Update current distance
num_current_distance = num_new_distance
# Update point_current
index_of_new_distance = list_distances.index(num_new_distance)
point_current = list_neighbors[index_of_new_distance][1]
# Update set_a
for neighbor in list_neighbors:
set_a.discard(neighbor)
# Update list_neighbors
filter_only_a_marked_points = filter(
lambda x: x[1] in set_a,
self.graph.get_neighbours_list(point_current))
list_neighbors = list(filter_only_a_marked_points)
return point_current
def __correct_graph_structure(self, list_pointsToCorrect: list):
"""
This method corrects connections of each point in list_pointsToCorrect
NEED TO MODIFY. DANGER OF LOSS OF CONNECTIONS BETWEEN PARTS OF GRAPH
:return: none
"""
for point in list_pointsToCorrect:
# Get neighbors of point
list_tuples_current_neighbors = self.graph.get_neighbours_list(
point)
# Get distance to nearest neighbor
if len(list_tuples_current_neighbors
) == 0 or list_tuples_current_neighbors is None:
self.add_point(point)
class NRA(Algorithm):
# noinspection PyMissingConstructor
def __init__(self):
self.graph = Graph()
self.cache = None
pass
"""
Вычисляем расстояние от добавляемой точки до всех имеющихся точек.
Добавляем ближайшую в список соседей
"""
def add_point(self, point: Point):
if len(self.graph) == 0:
self.cache = point
self.graph.add_point(point)
return
elif len(self.graph) == 1:
fp = self.graph.get_points()[0]
self.graph.add_point(point, fp)
self.graph.set_neighbours(fp, point)
return
distances = self.graph.get_distance_to(point)
neighbours = set()
for index in range(len(distances)):
add_flag = True
verifiable_cluster = distances[index][1]
dist = distances[index][0]
for neighbour in neighbours:
dist_to_ngh = neighbour.distance_to(verifiable_cluster)
if dist >= dist_to_ngh:
add_flag = False
break
if add_flag:
neighbours.add(verifiable_cluster)
if len(neighbours) == 0:
neighbours.add(distances[0][1])
neighbours = self.__check_crossing(point, neighbours)
self.graph.add_point(point, neighbours)
else:
neighbours = self.__check_crossing(point, neighbours)
self.graph.add_point(point, neighbours)
pass
def __check_crossing(self, new_point, neighbours_of_new):
for neighbour in copy(neighbours_of_new):
neighbours_of_current = self.graph.get_neighbours(neighbour)
for ngh_o_c in neighbours_of_current:
if new_point.distance_to(neighbour) < ngh_o_c.distance_to(neighbour) and \
new_point.distance_to(ngh_o_c) < ngh_o_c.distance_to(neighbour):
neighbours_of_new.add(ngh_o_c)
self.graph.delete_neighbours(neighbour, ngh_o_c)
self.graph.delete_neighbours(ngh_o_c, neighbour)
return neighbours_of_new
def __check_relationship(self, point_set: set):
for point in point_set:
test_set = set()
new_check_set = set()
neighbours = self.graph.get_distance_to(point)
test_set.add(neighbours[1][1])
for index in range(2, len(neighbours)):
add_flag = True
for test_point in test_set:
if neighbours[index][0] > test_point.distance_to(
neighbours[index][1]):
add_flag = False
new_check_set.add(neighbours[index][1])
break
if add_flag:
test_set.add(neighbours[index][1])
if len(new_check_set) != 0:
self.graph.set_neighbours(point, test_set)
def delete_point(self, point: Point):
if len(self.graph) < 2:
self.graph.remove_point(point)
else:
if point == self.cache:
self.cache = self.graph.get_points()[0]
neighbours = self.graph.get_neighbours_list(point)
self.graph.remove_point(point)
self.__check_relationship(neighbours)
pass
def find_nearest_to(self, point: Point):
current = self.cache
temp = None
minimal = point.distance_to(current)
cluster_set = {x for x in self.graph.get_points()}
cluster_set.discard(current)
while True:
the_smallest = float('inf')
neighbours = self.graph.get_neighbours(current)
cluster_set.difference_update(neighbours)
for neighbour in neighbours:
dist = neighbour.distance_to(point)
if dist < the_smallest:
the_smallest = dist
temp = neighbour
# noinspection PyChainedComparisons
if the_smallest < minimal and len(
cluster_set) != 0 and minimal != 0:
minimal = the_smallest
current = temp
else:
break
self.cache = current
return current
pass
class NRA(Algorithm):
# noinspection PyMissingConstructor
def __init__(self):
self.graph = Graph()
self.cache = None
pass
"""
Вычисляем расстояние от добавляемой точки до всех имеющихся точек.
Добавляем ближайшую в список соседей
"""
def add_point(self, point: Point):
if len(self.graph) == 0:
self.cache = point
self.graph.add_point(point)
return
elif len(self.graph) == 1:
fp = self.graph.get_points()[0]
self.graph.add_point(point, fp)
self.graph.set_neighbours(fp, point)
return
distances = self.graph.get_distance_to(point)
neighbours = set()
for index in range(len(distances)):
add_flag = True
verifiable_cluster = distances[index][1]
dist = distances[index][0]
for neighbour in neighbours:
dist_to_ngh = neighbour.distance_to(verifiable_cluster)
if dist >= dist_to_ngh:
add_flag = False
break
if add_flag:
neighbours.add(verifiable_cluster)
if len(neighbours) == 0:
neighbours.add(distances[0][1])
self.graph.add_point(point, neighbours)
else:
self.graph.add_point(point, neighbours)
pass
def delete_point(self, point: Point):
if len(self.graph) < 3:
isolated_points = self.graph.remove_point(point)
for p in isolated_points:
self.graph.remove_point(p)
self.add_point(p)
elif self.graph.is_in_graph(point):
neighbours = self.graph.get_neighbours(point)
self.graph.remove_point(point)
for neighbour in neighbours:
isolated_points = self.graph.remove_point(neighbour)
for p in isolated_points:
self.graph.remove_point(p)
self.add_point(p)
self.add_point(neighbour)
pass
def find_nearest_to(self, point: Point):
current = self.cache
temp = None
minimal = point.distance_to(current)
cluster_set = {x for x in self.graph.get_points()}
cluster_set.discard(current)
while True:
the_smallest = float('inf')
neighbours = self.graph.get_neighbours(current)
cluster_set.difference_update(neighbours)
for neighbour in neighbours:
dist = neighbour.distance_to(point)
if dist < the_smallest:
the_smallest = dist
temp = neighbour
# noinspection PyChainedComparisons
if the_smallest < minimal and len(
cluster_set) != 0 and minimal != 0:
minimal = the_smallest
current = temp
else:
break
self.cache = current
return current
pass