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annotate gamelib/animal.py @ 38:03121c89d5fd

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Make the secret foxes really secret
author Neil Muller <drnlmuller@gmail.com>
date Mon, 31 Aug 2009 13:28:59 +0000
parents f5f74f1f3a0b
children 7e884084e7b1
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1 """Class for the various animals in the game"""
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3 import pygame
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4 import random
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5 from pgu.vid import Sprite
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7 import data
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9 class Animal(Sprite):
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10 """Base class for animals"""
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12 def __init__(self, image, pos):
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13 # Create the animal somewhere far off screen
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14 Sprite.__init__(self, image, (-1000, -1000))
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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 = pygame.image.load(data.filepath('sprites/chkn.png'))
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32 Animal.__init__(self, image, pos)
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34 def move(self, gameboard):
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35 """A free chicken will move away from other free chickens"""
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36 return self.pos
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38 class Egg(Animal):
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39 """An egg"""
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41 # Eggs don't move
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43 class Fox(Animal):
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44 """A fox"""
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46 def __init__(self, pos):
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47 image = pygame.image.load(data.filepath('sprites/fox.png'))
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48 self.full = False
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49 Animal.__init__(self, image, pos)
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51 def move(self, gameboard):
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52 """Foxes will aim to move towards the closest henhouse or free
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53 chicken"""
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54 if self.full:
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55 return
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56 # Find the closest chicken
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57 min_dist = 999
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58 min_vec = None
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59 closest = None
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60 for chicken in gameboard.chickens:
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61 vec = (chicken.pos[0] - self.pos[0], chicken.pos[1] - self.pos[1])
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62 dist = abs(vec[0]) + abs(vec[1])
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63 if dist < min_dist:
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64 min_dist = dist
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65 min_vec = vec
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66 closest = chicken
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67 xpos, ypos = self.pos
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68 if min_vec[0] < 0:
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69 xpos -= 1
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70 elif min_vec[0] > 0:
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71 xpos += 1
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72 if min_vec[1] < 0:
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73 ypos -= 1
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74 elif min_vec[1] > 0:
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75 ypos += 1
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76 if closest.pos == self.pos:
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77 gameboard.remove_chicken(closest)
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78 self.full = True
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79 for fox in gameboard.foxes:
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80 if fox is not self:
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81 if fox.pos[0] == xpos and fox.pos[1] == ypos:
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82 if xpos != self.pos[0]:
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83 xpos = self.pos[0]
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84 elif ypos != self.pos[1]:
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85 ypos = self.pos[1]
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86 else: # We move a step away
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87 xpos += 1
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88 self.pos = (xpos, ypos)
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