#random_walk.py
from random import choice
# -*- coding: utf-8 -*-
class RandomWalk():
  #一個生成隨機漫步數(shù)據(jù)的類

  def __init__(self,num_points=5000):
   self.num_points=num_points
   self.x_values=[0]
   self.y_values=[0]

  def fill_walk(self):
   #計算隨機漫步包含的所有點

   while len(self.x_values)<self.num_points:
    #決定前進(jìn)方向以及沿這個方向前進(jìn)的距離
    x_direction=choice([-1,1])
    x_distance=choice([0,1,2,3,4])
    x_step=x_direction*x_distance

    y_direction=choice([-1,1])
    y_distance=choice([0,1,2,3,4])
    y_step=y_direction*y_distance

    #拒絕原地踏步
    if x_step==0 and y_step==0:
     continue

    #計算下一個點的x和y值
    next_x=self.x_values[-1]+x_step
    next_y=self.y_values[-1]+y_step

    self.x_values.append(next_x)
    self.y_values.append(next_y)

#rw.py
# coding=gbk
import matplotlib.pyplot as plt
from random_walk import RandomWalk


while True:
  rw=RandomWalk()
  rw.fill_walk()

  #設(shè)置繪圖窗口的尺寸
  plt.figure(dpi=128,figsize=(10,6))

  point_numbers=list(range(rw.num_points))
  plt.scatter(rw.x_values,rw.y_values,c=point_numbers,cmap=plt.cm.Blues,s=15)

  #突出起點和終點
  plt.scatter(0,0,c='green',s=100)
  plt.scatter(rw.x_values[-1],rw.y_values[-1],c='red',s=100)

  #隱藏坐標(biāo)軸
  plt.axes().get_xaxis().set_visible(False)
  plt.axes().get_yaxis().set_visible(False)

  plt.show()

  keep_running=input("Make another walk?(y/n):")
  if keep_running=='n':
   break