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A*算法最早可追溯到1968年,在IEEE Transactions on Systems Science and Cybernetics中的论文A Formal Basis for the Heuristic Determination of Minimum Cost Paths中首次提出。正如本文的摘要所说,A*算法是把启发式方法(heuristic approaches)如BFS(完全使用贪心策略),和常规方法如Dijsktra算法结合在一起的算法。有点不同的是,类似BFS的启发式方法经常给出一个近似解而不是保证最佳解。然而,尽管A*算法基于无法保证最佳解的启发式方法,A*算法却能保证找到一条最短路径。
参考文献:
[1]张海涛,程荫杭.基于A*算法的全局路径搜索[J].微计算机信息, 2007(17):3.DOI:10.3969/j.issn.1008-0570.2007.17.095.
[2]张红梅,李明龙,杨乐.基于改进A*算法的移动机器人安全路径规划[J].计算机仿真, 2018, 35(4): 319-324.
- import math
-
- import matplotlib.pyplot as plt
-
- show_animation = True
-
-
- class AStarPlanner:
-
- def __init__(self, ox, oy, resolution, rr):
- """
- Initialize grid map for a star planning
- ox: x position list of Obstacles [m]
- oy: y position list of Obstacles [m]
- resolution: grid resolution [m]
- rr: robot radius[m]
- """
-
- self.resolution = resolution
- self.rr = rr
- self.min_x, self.min_y = 0, 0
- self.max_x, self.max_y = 0, 0
- self.obstacle_map = None
- self.x_width, self.y_width = 0, 0
- self.motion = self.get_motion_model()
- self.calc_obstacle_map(ox, oy)
-
- class Node:
- def __init__(self, x, y, cost, parent_index):
- self.x = x # index of grid
- self.y = y # index of grid
- self.cost = cost
- self.parent_index = parent_index
-
- def __str__(self):
- return str(self.x) + "," + str(self.y) + "," + str(
- self.cost) + "," + str(self.parent_index)
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