Question

尝试更新A *实现以包括不同地形的成本。我知道我必须更新我的child.g以包括地形的成本，而不是针对非地形成本的实现，而不要使用current_node.g + 1，但是我不知道怎么做。

# child.g = current_node.g + maze[child.g]

所有成本在我的表格（maze [] []）中均以数字表示。尝试最后一行只会给我一个错误。（它不再是迷宫，而是用于前几个任务）。

感谢所有帮助。

编辑：发布整个代码，它对非加权板非常有效。

maze5 = [[50,50,50,50,50,10,10,10,10,1,1,1,1,1,1,1,1,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,10,10,10,50,50,50,50,50],
    [50,50,50,10,10,10,10,10,10,10,10,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,10,10,10,10,10,50,50,50,50],
    [50,50,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,1,10,10,10,10,10,10,50,50,50,50],
    [50,50,10,10,10,10,10,10,10,10,10,10,10,10,10,100,100,100,100,100,10,10,10,10,10,10,10,10,10,1,10,10,10,10,10,10,10,50,50,50],
    [50,10,10,10,10,10,10,10,10,10,10,10,10,10,100,100,100,100,100,100,100,10,10,10,10,10,10,10,10,1,10,10,10,10,10,10,50,50,50,50],
    [50,50,10,10,10,10,10,10,10,10,10,10,10,10,100,100,100,100,100,100,100,10,10,1,1,1,1,1,1,1,1,1,1,1,1,1,50,50,50,50],
    [50,50,50,10,10,10,10,10,10,10,10,10,10,10,10,100,100,100,100,100,10,10,10,10,10,10,10,10,10,10,10,10,1,10,10,10,10,50,50,50],
    [50,50,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,1,10,10,10,10,10,50,50],
    [50,50,10,10,10,10,10,10,10,10,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,10,10,10,10,50,50],
    [50,50,50,10,10,10,10,5,5,5,5,5,5,5,5,5,5,0,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,10,10,50,50]]









class Node():
"""A node class for A* Pathfinding"""

    def __init__(self, parent=None, position=None):
        self.parent = parent
        self.position = position

        self.g = 0
        self.h = 0
        self.f = 0

    def __eq__(self, other):
        return self.position == other.position


def astar(maze, start, end):
"""Returns a list of tuples as a path from the given start to the given end in the given maze"""

# Create start and end node
    start_node = Node(None, start)
    start_node.g = start_node.h = start_node.f = 0
    end_node = Node(None, end)
    end_node.g = end_node.h = end_node.f = 0

# Initialize both open and closed list
    open_list = []
    closed_list = []

# Add the start node
    open_list.append(start_node)

# Loop until you find the end
    while len(open_list) > 0:

    # Get the current node
        current_node = open_list[0]
        current_index = 0
        for index, item in enumerate(open_list):
            if item.f < current_node.f:
                current_node = item
                current_index = index

    # Pop current off open list, add to closed list
        open_list.pop(current_index)
        closed_list.append(current_node)

    # Found the goal
        if current_node == end_node:
             path = []
            current = current_node
            while current is not None:
            path.append(current.position)
            current = current.parent
            return path[::-1]  # Return reversed path

    # Generate children
        children = []
        for new_position in [(0, -1), (0, 1), (-1, 0), (1, 0), (-1, -1), (-1, 1), (1, -1), (1, 1)]:  # Adjacent squares

        # Get node position
            node_position = (current_node.position[0] + new_position[0], current_node.position[1] + new_position[1])

        # Make sure within range
            if node_position[0] > (len(maze) - 1) or node_position[0] < 0 or node_position[1] > (len(maze[len(maze) - 1]) - 1) or node_position[1] < 0:
                continue

            if Node(current_node, node_position) in closed_list:
                continue

        # Make sure walkable terrain (Only for task 1)
            #if maze[node_position[0]][node_position[1]] != 0:
               # continue

        # Create new node
            new_node = Node(current_node, node_position)

        # Append
            children.append(new_node)

    # Loop through children
        for child in children:

        # Child is on the closed list
            for closed_child in closed_list:
                if child == closed_child:
                    continue

        # Create the f, g, and h values

            child.g = current_node.g + 1
            child.h = ((child.position[0] - end_node.position[0]) ** 2) + ((child.position[1] - end_node.position[1]) ** 2)
            child.f = child.g + child.h

        # Child is already in the open list
            for open_node in open_list:
                if child == open_node and child.g > open_node.g:
                    continue

        # Add the child to the open list
            open_list.append(child)


def main():

"""path = astar(maze1, start1, end1)
print("Path Maze 1: ")
print(path)
print("\n")

path2 = astar(maze2, start2, end2)
print("Path Maze 2: ")
print(path2)
print("\n")

path3 = astar(maze3, start3, end3)
print("Path Maze 3: ")
print(path3)
print("\n")

path4 = astar(maze4, start4, end4)
print("Path Maze 4: ")
print(path4)"""

    path5 = astar(maze5, start5, end5)
    print("Path Maze 5: ")
    print(path5)

Answer 1

变量child.g仅在for循环内有效。由于您正在尝试在for循环后访问它的抛出错误。

如果不是这种情况，请分享您遇到的错误。

更新A *以包括地形成本

1 个答案: