Complete Roguelike Tutorial, using python+libtcod, part 2 code

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This is part of the code for a series of tutorials; the main page can be found here.

The Map

import libtcodpy as libtcod

#actual size of the window
SCREEN_WIDTH = 80
SCREEN_HEIGHT = 50

#size of the map
MAP_WIDTH = 80
MAP_HEIGHT = 45

LIMIT_FPS = 20  #20 frames-per-second maximum


color_dark_wall = libtcod.Color(0, 0, 100)
color_dark_ground = libtcod.Color(50, 50, 150)


class Tile:
    #a tile of the map and its properties
    def __init__(self, blocked, block_sight = None):
        self.blocked = blocked
        
        #by default, if a tile is blocked, it also blocks sight
        if block_sight is None: block_sight = blocked
        self.block_sight = block_sight

class Object:
    #this is a generic object: the player, a monster, an item, the stairs...
    #it's always represented by a character on screen.
    def __init__(self, x, y, char, color):
        self.x = x
        self.y = y
        self.char = char
        self.color = color
    
    def move(self, dx, dy):
        #move by the given amount, if the destination is not blocked
        if not map[self.x + dx][self.y + dy].blocked:
            self.x += dx
            self.y += dy
    
    def draw(self):
        #set the color and then draw the character that represents this object at its position
        libtcod.console_set_foreground_color(0, self.color)
        libtcod.console_put_char(0, self.x, self.y, self.char, libtcod.BKGND_NONE)
    
    def clear(self):
        #erase the character that represents this object
        libtcod.console_put_char(0, self.x, self.y, ' ', libtcod.BKGND_NONE)



def make_map():
    global map
    
    #fill map with "unblocked" tiles
    map = [[ Tile(False)
        for y in range(MAP_HEIGHT) ]
            for x in range(MAP_WIDTH) ]
    
    #place two pillars to test the map
    map[30][22].blocked = True
    map[30][22].block_sight = True
    map[50][22].blocked = True
    map[50][22].block_sight = True


def render_all():
    global color_light_wall
    global color_light_ground

    #draw all objects in the list
    for object in objects:
        object.draw()
    
    #go through all tiles, and set their background color
    for y in range(MAP_HEIGHT):
        for x in range(MAP_WIDTH):
            wall = map[x][y].block_sight
            if wall:
                libtcod.console_set_back(0, x, y, color_dark_wall, libtcod.BKGND_SET )
            else:
                libtcod.console_set_back(0, x, y, color_dark_ground, libtcod.BKGND_SET )
    
def handle_keys():
    key = libtcod.console_check_for_keypress()  #real-time
    #key = libtcod.console_wait_for_keypress(True)  #turn-based
    
    if key.vk == libtcod.KEY_ENTER and key.lalt:
        #Alt+Enter: toggle fullscreen
        libtcod.console_set_fullscreen(not libtcod.console_is_fullscreen())
        
    elif key.vk == libtcod.KEY_ESCAPE:
        return True  #exit game
    
    #movement keys
    if libtcod.console_is_key_pressed(libtcod.KEY_UP):
        player.move(0, -1)
        
    elif libtcod.console_is_key_pressed(libtcod.KEY_DOWN):
        player.move(0, 1)
        
    elif libtcod.console_is_key_pressed(libtcod.KEY_LEFT):
        player.move(-1, 0)
        
    elif libtcod.console_is_key_pressed(libtcod.KEY_RIGHT):
        player.move(1, 0)


#############################################
# Initialization & Main Loop
#############################################

libtcod.console_set_custom_font('arial10x10.png', libtcod.FONT_TYPE_GREYSCALE | libtcod.FONT_LAYOUT_TCOD)
libtcod.console_init_root(SCREEN_WIDTH, SCREEN_HEIGHT, 'python/libtcod tutorial', False)
libtcod.sys_set_fps(LIMIT_FPS)

#create object representing the player
player = Object(SCREEN_WIDTH/2, SCREEN_HEIGHT/2, '@', libtcod.white)

#create an NPC
npc = Object(SCREEN_WIDTH/2 - 5, SCREEN_HEIGHT/2, '@', libtcod.yellow)

#the list of objects with those two
objects = [npc, player]

#generate map (at this point it's not drawn to the screen)
make_map()


#first_time = True  #for turn-based games

while not libtcod.console_is_window_closed():

    #erase all objects at their old locations, before they move
    for object in objects:
        object.clear()
    
    #handle keys and exit game if needed
    #if not first_time:  #for turn-based games
    exit = handle_keys()
    if exit:
        break
    #first_time = False  #for turn-based games
    
    #render the screen
    render_all()
    
    libtcod.console_flush()


Field of View (FOV)

import libtcodpy as libtcod

  1. actual size of the window

SCREEN_WIDTH = 80 SCREEN_HEIGHT = 50

  1. size of the map

MAP_WIDTH = 80 MAP_HEIGHT = 45


FOV_ALGO = 0 #default FOV algorithm FOV_LIGHT_WALLS = True #light walls or not TORCH_RADIUS = 10

LIMIT_FPS = 20 #20 frames-per-second maximum


color_dark_wall = libtcod.Color(0, 0, 100) color_light_wall = libtcod.Color(130, 110, 50) color_dark_ground = libtcod.Color(50, 50, 150) color_light_ground = libtcod.Color(200, 180, 50)


class Tile: 

   #a tile of the map and its properties
   def __init__(self, blocked, block_sight = None):
       self.blocked = blocked
       
       #by default, if a tile is blocked, it also blocks sight
       if block_sight is None: block_sight = blocked
       self.block_sight = block_sight

class Object: 

   #this is a generic object: the player, a monster, an item, the stairs...
   #it's always represented by a character on screen.
   def __init__(self, x, y, char, color):
       self.x = x
       self.y = y
       self.char = char
       self.color = color
   
   def move(self, dx, dy):
       #move by the given amount, if the destination is not blocked
       if not map[self.x + dx][self.y + dy].blocked:
           self.x += dx
           self.y += dy
   
   def draw(self):
       #only show if it's visible to the player
       if libtcod.map_is_in_fov(fov_map, self.x, self.y):
           #set the color and then draw the character that represents this object at its position
           libtcod.console_set_foreground_color(0, self.color)
           libtcod.console_put_char(0, self.x, self.y, self.char, libtcod.BKGND_NONE)
   
   def clear(self):
       #erase the character that represents this object
       libtcod.console_put_char(0, self.x, self.y, ' ', libtcod.BKGND_NONE)


def make_map(): 

   global map
   
   #fill map with "unblocked" tiles
   map = [[ Tile(False)
       for y in range(MAP_HEIGHT) ]
           for x in range(MAP_WIDTH) ]
   
   #place two pillars to test the map
   map[30][22].blocked = True
   map[30][22].block_sight = True
   map[50][22].blocked = True
   map[50][22].block_sight = True


def render_all(): 

   global fov_map, color_dark_wall, color_light_wall
   global color_dark_ground, color_light_ground
   global fov_recompute

   #draw all objects in the list
   for object in objects:
       object.draw()
   
   if fov_recompute:
       #recompute FOV if needed (the player moved or something)
       fov_recompute = False
       libtcod.map_compute_fov(fov_map, player.x, player.y, TORCH_RADIUS, FOV_LIGHT_WALLS, FOV_ALGO)

       #go through all tiles, and set their background color according to the FOV
       for y in range(MAP_HEIGHT):
           for x in range(MAP_WIDTH):
               visible = libtcod.map_is_in_fov(fov_map, x, y)
               wall = map[x][y].block_sight
               if not visible:
                   #it's out of the player's FOV
                   if wall:
                       libtcod.console_set_back(0, x, y, color_dark_wall, libtcod.BKGND_SET)
                   else:
                       libtcod.console_set_back(0, x, y, color_dark_ground, libtcod.BKGND_SET)
               else:
                   #it's visible
                   if wall:
                       libtcod.console_set_back(0, x, y, color_light_wall, libtcod.BKGND_SET )
                   else:
                       libtcod.console_set_back(0, x, y, color_light_ground, libtcod.BKGND_SET )

def handle_keys(): 

   global fov_recompute
   
   key = libtcod.console_check_for_keypress()  #real-time
   #key = libtcod.console_wait_for_keypress(True)  #turn-based
   
   if key.vk == libtcod.KEY_ENTER and key.lalt:
       #Alt+Enter: toggle fullscreen
       libtcod.console_set_fullscreen(not libtcod.console_is_fullscreen())
       
   elif key.vk == libtcod.KEY_ESCAPE:
       return True  #exit game
   
   #movement keys
   elif libtcod.console_is_key_pressed(libtcod.KEY_UP):
       player.move(0, -1)
       fov_recompute = True
       
   elif libtcod.console_is_key_pressed(libtcod.KEY_DOWN):
       player.move(0, 1)
       fov_recompute = True
       
   elif libtcod.console_is_key_pressed(libtcod.KEY_LEFT):
       player.move(-1, 0)
       fov_recompute = True
       
   elif libtcod.console_is_key_pressed(libtcod.KEY_RIGHT):
       player.move(1, 0)
       fov_recompute = True


  2. Initialization & Main Loop

libtcod.console_set_custom_font('arial10x10.png', libtcod.FONT_TYPE_GREYSCALE | libtcod.FONT_LAYOUT_TCOD) libtcod.console_init_root(SCREEN_WIDTH, SCREEN_HEIGHT, 'python/libtcod tutorial', False) libtcod.sys_set_fps(LIMIT_FPS)

  1. create object representing the player

player = Object(SCREEN_WIDTH/2, SCREEN_HEIGHT/2, '@', libtcod.white)

  1. create an NPC

npc = Object(SCREEN_WIDTH/2 - 5, SCREEN_HEIGHT/2, '@', libtcod.yellow)

  1. the list of objects with those two

objects = [npc, player]

  1. generate map (at this point it's not drawn to the screen)

make_map()

  1. create the FOV map, according to the generated map

fov_map = libtcod.map_new(MAP_WIDTH, MAP_HEIGHT) for y in range(MAP_HEIGHT): 

   for x in range(MAP_WIDTH):
       libtcod.map_set_properties(fov_map, x, y, not map[x][y].blocked, not map[x][y].block_sight)


fov_recompute = True

  1. first_time = True #for turn-based games

while not libtcod.console_is_window_closed(): 

   #erase all objects at their old locations, before they move
   for object in objects:
       object.clear()
   
   #handle keys and exit game if needed
   #if not first_time:  #for turn-based games
   exit = handle_keys()
   if exit:
       break
   #first_time = False  #for turn-based games
   
   #render the screen
   render_all()
   
   libtcod.console_flush()
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