def construct_begin_edge(output: [Edge], tree: Tree, vertices: [Point],
ray: Ray):
vertex = ray.end
leftmost = tree.leftmost
z = ray.intersect(leftmost.edge)
if z is None:
raise ValueError("No intersections")
# finding right point for construct edge with point z
x, y = leftmost.edge.get_points()
n = x if get_angle(ray.start, ray.end, x) < get_angle(
ray.start, ray.end, y) else y
partial_edge = Edge(n, z, visible=leftmost.edge.visible)
new_node = Node(partial_edge)
edge1, edge2 = n.edges
if edge1 == leftmost.edge:
edge1 = partial_edge
else:
edge2 = partial_edge
n.edges = edge1, edge2
tree.update(old=leftmost, new=new_node, ray=ray)
new_edge = Edge(z, vertex, visible=False)
output.append(new_edge)
def get_config_tree(config_str):
config_tokens = config_str.split()
if "nil" not in config_tokens:
config_str += " " + " ".join(["nil"] * len(config_tokens))
tree = Tree()
tree.parse(config_str, int)
# convert from 1-indexed to zero-indexed
tree = tree.dfs(lambda x: x - 1)
return tree
def get_config_tree(config_str):
config_tokens = config_str.split()
if 'nil' not in config_tokens:
config_str += ' ' + ' '.join(['nil'] * len(config_tokens))
tree = Tree()
tree.parse(config_str, int)
# convert from 1-indexed to zero-indexed
tree = tree.dfs(lambda x: x - 1)
return tree
def init_tree(edges, ray) -> Tree:
nodes = []
for edge in edges:
assert_edge(ray, edge)
dist = ray.start.dist(ray.intersect(edge))
nodes.append(Node(edge, dist))
return Tree(nodes)
#!/usr/bin/env python from tree_ import Tree from sys import argv assert (len(argv) == 2) t = Tree() # method 2 t.parse(argv[1], str, 2) print t.to_string() # method 1 t.parse(argv[1], str) print t.to_string()
def insert(tree: Tree, edge: Edge, ray: Ray):
assert_edge(ray, edge)
node = Node(edge, ray.intersect_dist(edge))
tree.insert(node, ray)
def update(tree: Tree, old: Edge, new: Edge, ray: Ray):
assert_edge(ray, old)
assert_edge(ray, new)
old = Node(old, ray.intersect_dist(old))
new = Node(new, ray.intersect_dist(new))
tree.update(old, new, ray)
#!/usr/bin/env python from tree_ import Tree from sys import argv assert(len(argv) == 2) t = Tree() # method 2 t.parse(argv[1], str, 2) print t.to_string() # method 1 t.parse(argv[1], str) print t.to_string()
