Hi,
I have a problem using a class object within another class.
It is about the line:
self.openlist.append(Node(self.start, None, 0, 0))
If I use it in __init__ it works. If I use it in calcRoute(self) I get the
following error: local variable 'node' referenced before assignment The error
occures in AMap.calcRoute()
Where is my mistake?
Thanks
Robert
import numpy as np
from matplotlib import pyplot as plt
import matplotlib.cm as cm
class Node(object):
def __init__(self, pos, parent, g , h):
self.pos = pos
self.parent = parent
self.g = g
self.h = h
self.f = g+h
class NewAMap(object):
def __init__(self, size, start, target):
self.size = size
self.start = start
self.target = target
self.openlist = []
self.closedlist = set()
self.EmptyValue = 0
self.clear()
self.addStart(self.start)
self.addTarget(self.target)
#self.openlist.append(Node(self.start, None, 0, 0))
def clear(self):
self.OccMap = np.zeros(shape=(self.size[0],self.size[1]),dtype=int)
def display(self):
print np.swapaxes(self.OccMap,0,1)
self.PicMap =
np.zeros(shape=(self.size[0],self.size[1]),dtype=(float,3))
for x in xrange(0,self.size[0]):
for y in xrange(0,self.size[1]):
if self.OccMap[x][y] == 0:
self.PicMap[y][x]=(1,1,1)
elif self.OccMap[x][y] == -1:
self.PicMap[y][x]=(0,0,0)
elif self.OccMap[x][y] == -2:
self.PicMap[y][x]=(1,0,0)
elif self.OccMap[x][y] == -3:
self.PicMap[y][x]=(0,0,1)
#print self.PicMap
plt.imshow(self.PicMap, interpolation='nearest')
plt.show()
def addBlocked(self, blockposs):
self.OccMap[blockposs[0]][blockposs[1]]=-1
def addStart(self, start):
self.OccMap[start[0]][start[1]]=-2
def addTarget(self, target):
self.OccMap[target[0]][target[1]]=-3
def calcRoute(self):
self.openlist.append(Node(self.start, None, 0, 0))
for Node in self.openlist: print Node.pos, Node.parent, Node.g, Node.h,
Node.f
def main():
AMap = NewAMap((20,20),(1,12),(12,12))
for y in range(8,17): AMap.addBlocked((8,y))
AMap.calcRoute()
AMap.display()
if __name__ == '__main__':
main()
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