Mercurial > rinkhals

annotate gamelib/animal.py @ 53:f20dd3dcb118

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foxes don't run backwards
author Adrianna Pińska <adrianna.pinska@gmail.com>
date Mon, 31 Aug 2009 17:47:10 +0000
parents be2496df2368
children d92a2f973cc4
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1 """Class for the various animals in the game"""
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3 from pgu.vid import Sprite
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5 import imagecache
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7 class Animal(Sprite):
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8 """Base class for animals"""
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9
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10 def __init__(self, image_left, image_right, pos):
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11 # Create the animal somewhere far off screen
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12 Sprite.__init__(self, image_left, (-1000, -1000))
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13 self.image_left = image_left
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14 self.image_right = image_right
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15 self.pos = pos
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17 def loop(self, tv, _sprite):
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18 ppos = tv.tile_to_view(self.pos)
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19 self.rect.x = ppos[0]
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20 self.rect.y = ppos[1]
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22 def move(self, state):
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23 """Given the game state, return a new position for the object"""
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24 # Default is not to move
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25 return self.pos
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27 class Chicken(Animal):
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28 """A chicken"""
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30 def __init__(self, pos):
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31 image_left = imagecache.load_image('sprites/chkn.png')
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32 image_right = imagecache.load_image('sprites/chkn.png', ("right_facing",))
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33 Animal.__init__(self, image_left, image_right, pos)
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35 def move(self, gameboard):
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36 """A free chicken will move away from other free chickens"""
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37 return self.pos
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39 class Egg(Animal):
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40 """An egg"""
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41
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42 def __init__(self, pos):
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43 image = imagecache.load_image('sprites/egg.png')
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44 Animal.__init__(self, image, image, pos)
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46 # Eggs don't move
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48 class Fox(Animal):
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49 """A fox"""
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51 def __init__(self, pos):
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52 image_left = imagecache.load_image('sprites/fox.png')
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53 image_right = imagecache.load_image('sprites/fox.png', ("right_facing",))
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54 self.full = False
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55 Animal.__init__(self, image_left, image_right, pos)
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57 def move(self, gameboard):
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58 """Foxes will aim to move towards the closest henhouse or free
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59 chicken"""
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60 if self.full:
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61 return
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62 # Find the closest chicken
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63 min_dist = 999
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64 min_vec = None
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65 closest = None
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66 for chicken in gameboard.chickens:
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67 vec = (chicken.pos[0] - self.pos[0], chicken.pos[1] - self.pos[1])
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68 dist = abs(vec[0]) + abs(vec[1])
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69 if dist < min_dist:
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70 min_dist = dist
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71 min_vec = vec
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72 closest = chicken
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73 xpos, ypos = self.pos
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74 if min_vec[0] < 0:
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75 xpos -= 1
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76 self.setimage(self.image_left)
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77 elif min_vec[0] > 0:
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78 xpos += 1
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79 self.setimage(self.image_right)
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80 if min_vec[1] < 0:
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81 ypos -= 1
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82 elif min_vec[1] > 0:
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83 ypos += 1
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84 if closest.pos == self.pos:
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85 gameboard.remove_chicken(closest)
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86 self.full = True
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87 for fox in gameboard.foxes:
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88 if fox is not self:
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89 if fox.pos[0] == xpos and fox.pos[1] == ypos:
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90 if xpos != self.pos[0]:
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91 xpos = self.pos[0]
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92 elif ypos != self.pos[1]:
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93 ypos = self.pos[1]
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94 else: # We move a step away
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95 xpos += 1
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96 self.pos = (xpos, ypos)
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