# -*-coding:gbk -*-
from numpy import *
dirs = [(1,1),(1,0),(1,-1),(0,-1),(-1,-1),(-1,0),(-1,1),(0,1)] # 四邻位置：从右下角开始顺时针得到，是按坐标差得到的
def find_path(oldmap,A,B):
 oldmap[A[0], A[1]] = 99
 oldmap[B[0], B[1]] = 99
 [a,b]=oldmap.shape
 pathmap=oldmap.copy()
 Q=[]#存储扩展节点
 P=[]#往外一层
 pathlen=1
 if A==B:
  print('start point is equal to end point')
  return True
 current=A
 while (True):
  for i in range(8):
   neighbor=[current[0]+dirs[i][0], current[1]+dirs[i][1]]
   if neighbor==B:
    print('the way is found')######################wrong
    print('中间过程')
    print(oldmap)
    find_way(oldmap,pathmap,A,B,a,b)#####调用路径函数
    return True
   if (neighbor[0]>=0 and neighbor[1]>=0 and neighbor[0]<a and neighbor[1]<b and oldmap[neighbor[0],neighbor[1]]==0):
    P.append(neighbor)
    oldmap[neighbor[0],neighbor[1]]=pathlen

  if Q==[]:
   if P ==[]:
    print(oldmap) ##############
    print('No path')
    return False
   else:
    Q.extend(P)
    P=[]
    pathlen += 1

  else:
   current=Q.pop()

###################寻找最短路径
def find_way(oldmap,pathmap,A,B,a,b):
 currentpos=B
 while (oldmap[currentpos[0],currentpos[1]]!=1):
  for i in range(8):
   neighborpos=[currentpos[0]+dirs[i][0], currentpos[1]+dirs[i][1]]
   if (neighborpos[0] >= 0 and neighborpos[1] >= 0 and neighborpos[0] < a and neighborpos[1] < b and oldmap[neighborpos[0],neighborpos[1]]!=0):
    if oldmap[neighborpos[0],neighborpos[1]]<oldmap[currentpos[0],currentpos[1]]:
     pathmap[neighborpos[0],neighborpos[1]]=oldmap[neighborpos[0],neighborpos[1]]
     currentpos=neighborpos
     break
 print('the way:')
 print(pathmap)

def main():
 map =mat([[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
    [0, 0, 0, 0, inf,inf, 0, 0, 0, 0, 0, 0, 0],
    [0, 0, 0, 0, 0,inf, 0, 0, 0, 0, 0, 0, 0],
    [inf,inf,inf, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
    [0, 0,inf, 0, 0, 0, 0, 0, 0, 0, 0, 0, inf],
    [0, 0,inf, 0, 0, 0, 0, 0, 0, 0, 0, 0, inf],
    [0, 0,inf, 0, 0, 0, 0, 0, 0, 0, 0, 0,inf],
    [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, inf],
    [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],])
 print('最初地图')
 print(map)
 print('**********************************')
 A = [5, 0]
 # B=[5,0]
 B = [3, 12]
 find_path(map,A, B)


if __name__=='__main__':
 main()