Moving around a small grid

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This a problem set for you to work through [1]

This is a problem set. Some of these are easy, others are far more difficult. The purpose of these problems sets are to HELP YOU THINK THROUGH problems. The solution is at the bottom of this page, but please don't look at it until you have tried (and failed) at least three or four times.

The Problem

This problem is designed to test your skill and knowledge of functions, variables and computational thinking.

You have a simple 10 x 10 grid, with your character at the center (5,5). You can move up, down, left and right. Add:

  • terrain
  • a bad guy
  • combat
  • basic AI
  • basic statistics for the bad guy (or you) like Hit Points, Armour, Power, etc...

Installing extra libraries in canopy

You will need to install the prettytables package for this code to work. This article will help you get started

The basic game

import random
import prettytable
import colorama
from colorama import Fore, Back, Style

grid = []

# let's make our map. We are making a  25 x 25 map
# for our terrain, we are going to randomly insert a number from 1 to 4
#
# 1 is normal ground ...
# 2 is normal ground ...
# 3 is a tree .*.
# 4 is a mountain .^.
# 5 is the player [T]

for i in range(0,625):
    grid.append(random.randrange(1,5))

# now we can manually change our terrain. This code puts a basic mountain range 
# at the very top of our map. 

grid.insert(0,4) 
grid.insert(1,4)
grid.insert(2,4)
grid.insert(3,4)
grid.insert(4,4)
grid.insert(5,4)  
   
     
# now we place the player
     
grid.insert(317,5)

# and let's keep track of where the player is. 

current_player_location = 317


# remember we have a 25 x 25 grid, which we are representing in a simple list. 
# this means row 1 is 0 to 24, row 2 is 25 to 49, row 3 is 50 to 74, etc...
# You should remember this when you work on the move code. 
#    

def draw_board():
    row = 0
    for i in range(0,625):
        if grid[i] == 1:
            print(Style.DIM + Fore.YELLOW + "..." + Style.RESET_ALL ,end='')
        elif grid[i] == 2:
            print(Style.DIM + Fore.YELLOW + "..." + Style.RESET_ALL ,end='')
        elif grid[i] == 3:
            print("." + Fore.GREEN + "*" + Style.RESET_ALL + ".",end='')
        elif grid[i] == 4:
            print("." + Style.DIM + Fore.WHITE + "^" + Style.RESET_ALL + ".",end='')
        elif grid[i] == 5:
            print("[" + Style.BRIGHT + Fore.RED + "T" + Style.RESET_ALL + "]",end='')
        else:
            print("ERR"),
        row = row + 1
        if row == 25:
            print ("\n")
            row = 0 
    return

def move(where_do_you_want_go):
    global current_player_location
    current_player_position = grid.index(5)
    if where_do_you_want_go == "up":
        #
        # let's make sure we are not at the top row, which is 0 to 24
        #
        if grid.index(5) <=25:
            print("You can't go up anymore.")
        elif grid[current_player_position - 25] == 3 or grid[current_player_position - 25] == 4:
            print("You cannot go up, as there is an obstacle in your path!")  
        else:
            print("The player is at position " +  str(grid.index(5)))
            grid[current_player_position - 25] = 5
            grid[current_player_position] = 1
            print("The new player is at position " +  str(grid.index(5)))  
                
    elif where_do_you_want_go == "down":
        current_player_position = grid.index(5)
        #
        # let's make sure we are not at the bottom row, which is 600 to 624
        #
        if grid.index(5) >=600:
            print("You can't go down anymore.")
        elif grid[current_player_position + 25] == 3 or grid[current_player_position + 25] == 4:
            print("You cannot move down, as there is an obstacle in your path!") 
        else:
            print("The player is at position " +  str(grid.index(5)))
            grid[current_player_position + 25] = 5
            grid[current_player_position] = 1
            print("The new player is at position " +  str(grid.index(5)))
       
    elif where_do_you_want_go == "right":
        current_player_position = grid.index(5)
        #
        # let's make sure we are not at the bottom row, which is 600 to 624
        #
        if grid.index(5) % 25 == 24:
            print("You can't go right anymore.")
        elif grid[current_player_position + 1] == 3 or grid[current_player_position + 1] == 4:
            print("You cannot move right, as there is an obstacle in your path!")     
        else:
            print("The player is at position " +  str(grid.index(5)))
            grid.insert(current_player_position + 1, grid.pop(current_player_position))
            print("The new player is at position " +  str(grid.index(5))) 
      
    elif where_do_you_want_go == "left":
        current_player_position = grid.index(5)
        #
        # let's make sure we are not at the bottom row, which is 600 to 624
        #
        if grid.index(5) % 25 == 0:
            print("You can't go left anymore.")
        elif grid[current_player_position - 1] == 3 or grid[current_player_position - 1] == 4:
            print("You cannot move left, as there is an obstacle in your path!")     
        else:
            print("The player is at position " +  str(grid.index(5)))
            grid.insert(current_player_position - 1, grid.pop(current_player_position)) 
            print("The new player is at position " +  str(grid.index(5)))                            
    return

def inventory():
    inventory = {'axe':1, 'pick axe':1, 'food':10}
    inventory_table = prettytable(['Item', 'Quantity'])
    inventory_table.align["Item"] = "l"
    for i,e in inventory.iteritems():
        inventory_table.add_row([str(i), e])
    print(inventory_table)
    foo = input("Press enter to contnue...")
    return


def main():
    while True:
        draw_board()
        print("Your current position is: " + str(grid.index(5)))
        print("Other information should appear here. ")
        print("Up, you see " + str(grid[grid.index(5)-25]))
        print("\n") 
        choice = input("What do you want to do (type help for help) > ")
        if choice == "99":
            break
        elif choice == "help":
            help()
        elif choice == "u":
             move('up')
        elif choice == "r":
             move('right')
        elif choice == "l":
             move('left')
        elif choice == "d":
             move('down')
        elif choice == "i":
            inventory()                          
    return

main()

Take this farther

You want to go farther?

  • add color to this
  • add many types of different entities (google nethack)
  • move the board to 50 x 50
  • add an option to SAVE / RESTORE a game

Make a decent map.

How you will be assessed

Every problem set is a formative assignment. Please click here to see how you will be graded

References