#-------------------------------------------------------------------------------
# Name:        module1
# Purpose:
#
# Author:      Shoblin
#
# Created:     27.11.2019
# Copyright:   (c) Shoblin 2019
# Licence:     <your licence>
#-------------------------------------------------------------------------------

from random import choice

class RandomWalk():
    ''' A class to generate random walks '''

    def __init__(self, number_points = 5000):
        """Initialize attributes of a walk."""

        self.number_points = number_points

        # All walks start at (0, 0)
        self.x_values = [0]
        self.y_values = [0]

    def fill_walk(self):
        ''' Calculate all the points in the walk '''

        # Keep taking steps until the walk reaches the desired length.
        while len(self.x_values) < self.number_points:

            # Decide which direction to go(x_direction) and how far to go in that direction.
            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

            # Reject moves that go nowhere.
            if x_step == 0 and y_step == 0:
                continue

            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)

