Mercurial > rinkhals

annotate gamelib/animal.py @ 243:4f86c2616cdf

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Variable number of eggs for chickens
author Neil Muller <drnlmuller@gmail.com>
date Sat, 05 Sep 2009 12:05:08 +0000
parents 1a7000c8211c
children 844bfb23d4b6
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1 """Class for the various animals in the game"""
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3 import random
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4
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5 from pgu.vid import Sprite
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6 from pgu.algo import getline
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7
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8 import imagecache
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9 import tiles
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10 from misc import Position
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11 import sound
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12 import equipment
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13 import animations
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15 class Animal(Sprite):
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16 """Base class for animals"""
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18 STEALTH = 0
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19 VISION_BONUS = 0
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20 VISION_RANGE_PENALTY = 10
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21
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22 def __init__(self, image_left, image_right, tile_pos):
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23 # Create the animal somewhere far off screen
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24 Sprite.__init__(self, image_left, (-1000, -1000))
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25 self._image_left = image_left
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26 self.image_left = image_left.copy()
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27 self._image_right = image_right
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28 self.image_right = image_right.copy()
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29 if hasattr(tile_pos, 'to_tuple'):
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30 self.pos = tile_pos
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31 else:
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32 self.pos = Position(tile_pos[0], tile_pos[1])
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33 self.equipment = []
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34 self.accoutrements = []
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35 self.abode = None
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36 self.facing = 'left'
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38 def loop(self, tv, _sprite):
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39 ppos = tv.tile_to_view(self.pos.to_tuple())
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40 self.rect.x = ppos[0]
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41 self.rect.y = ppos[1]
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43 def move(self, state):
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44 """Given the game state, return a new position for the object"""
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45 # Default is not to move
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46 pass
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48 def set_pos(self, tile_pos):
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49 """Move an animal to the given tile_pos."""
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50 new_pos = Position(*tile_pos)
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51 self._fix_face(new_pos)
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52 self.pos = new_pos
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54 def _fix_face(self, facing_pos):
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55 """Set the face correctly"""
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56 if facing_pos.left_of(self.pos):
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57 self._set_image_facing('left')
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58 elif facing_pos.right_of(self.pos):
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59 self._set_image_facing('right')
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60
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61 def _set_image_facing(self, facing):
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62 self.facing = facing
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63 if self.facing == 'left':
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64 self.setimage(self.image_left)
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65 elif self.facing == 'right':
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66 self.setimage(self.image_right)
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68 def equip(self, item):
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69 if equipment.is_equipment(item):
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70 self.equipment.append(item)
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71 elif equipment.is_accoutrement(item):
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72 self.accoutrements.append(item)
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73 self.redraw()
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75 def unequip(self, item):
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76 if equipment.is_equipment(item):
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77 self.equipment = [e for e in self.equipment if e != item]
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78 elif equipment.is_accoutrement(item):
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79 self.accoutrements = [e for e in self.accoutrements if e != item]
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80 self.redraw()
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81
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82 def unequip_by_name(self, item_name):
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83 # only remove first match
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84 matches = [item for item in self.equipment + self.accoutrements if item.NAME == item_name]
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85 if matches:
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86 self.unequip(matches[0])
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87
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88 def redraw(self):
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89 layers = [(self._image_left.copy(), self._image_right.copy(), 0)]
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90 if hasattr(self, 'EQUIPMENT_IMAGE_ATTRIBUTE'):
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91 for item in self.accoutrements + self.equipment:
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92 images = item.images(self.EQUIPMENT_IMAGE_ATTRIBUTE)
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93 if images:
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94 layers.append(images)
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96 layers.sort(key=lambda l: l[2])
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98 # these always go on the bottom so that other layers don't get overwritten
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99 self.image_left = self._image_left.copy()
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100 self.image_right = self._image_right.copy()
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101 for l in layers:
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102 self.image_left.blit(l[0], (0,0))
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103 self.image_right.blit(l[1], (0,0))
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104
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105 self._set_image_facing(self.facing)
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106
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107 def weapons(self):
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108 return [e for e in self.equipment if equipment.is_weapon(e)]
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109
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110 def armour(self):
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111 return [e for e in self.equipment if equipment.is_armour(e)]
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112
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113 def covers(self, tile_pos):
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114 return tile_pos[0] == self.pos.x and tile_pos[1] == self.pos.y
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115
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116 def outside(self):
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117 return self.abode is None
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118
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119 def survive_damage(self):
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120 for a in self.armour():
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121 if not a.survive_damage():
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122 self.unequip(a)
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123 return True
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124 return False
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125
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126 class Chicken(Animal):
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127 """A chicken"""
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128
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129 EQUIPMENT_IMAGE_ATTRIBUTE = 'CHICKEN_IMAGE_FILE'
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130
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131 def __init__(self, pos):
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132 image_left = imagecache.load_image('sprites/chkn.png')
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133 image_right = imagecache.load_image('sprites/chkn.png',
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134 ("right_facing",))
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135 Animal.__init__(self, image_left, image_right, pos)
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136 self.eggs = []
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137
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138 def move(self, gameboard):
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139 """A free chicken will move away from other free chickens"""
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140 pass
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141
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142 def lay(self):
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143 """See if the chicken lays an egg"""
243
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144 if not self.eggs:
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145 for x in range(random.randint(1, 4)):
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146 self.eggs.append(Egg(self.pos))
216
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147 self.equip(equipment.NestEgg())
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148
243
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149 def remove_eggs(self):
216
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150 """Clean up the egg state"""
243
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151 self.eggs = []
216
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152 self.unequip_by_name("nestegg")
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153
243
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154 def remove_one_egg(self):
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155 """Clean up the egg state"""
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156 self.eggs.pop()
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157 if not self.eggs:
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158 self.unequip_by_name("nestegg")
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159
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160 def get_num_eggs(self):
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161 return len(self.eggs)
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162
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163 def hatch(self, gameboard):
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164 """See if we have an egg to hatch"""
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165 if self.eggs:
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166 chick = self.eggs[0].hatch()
187
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167 if chick:
243
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168 # sell the remaining eggs
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169 # Remove hatched egg
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170 self.eggs.pop()
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171 gameboard.eggs -= 1
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172 # Sell other eggs
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173 for egg in self.eggs[:]:
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174 gameboard.sell_one_egg(self)
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175 self.remove_eggs() # clean up stale images, etc.
187
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176 return chick
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177 return None
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178
84
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179 def _find_killable_fox(self, weapon, gameboard):
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180 """Choose a random fox within range of this weapon."""
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181 killable_foxes = []
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182 for fox in gameboard.foxes:
114
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183 if not visible(self, fox):
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184 continue
84
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185 if weapon.in_range(gameboard, self, fox):
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186 killable_foxes.append(fox)
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187 if not killable_foxes:
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188 return None
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189 return random.choice(killable_foxes)
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190
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191 def attack(self, gameboard):
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192 """An armed chicken will attack a fox within range."""
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193 if not self.weapons():
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194 # Not going to take on a fox bare-winged.
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195 return
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196 # Choose the first weapon equipped.
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197 weapon = self.weapons()[0]
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198 fox = self._find_killable_fox(weapon, gameboard)
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199 if not fox:
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200 return
236
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201 self._fix_face(fox.pos)
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202 if weapon.hit(gameboard, self, fox):
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203 sound.play_sound("kill-fox.ogg")
84
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204 gameboard.kill_fox(fox)
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205
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206 class Egg(Animal):
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207 """An egg"""
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208
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209 def __init__(self, pos):
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210 image = imagecache.load_image('sprites/egg.png')
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211 Animal.__init__(self, image, image, pos)
243
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212 self.timer = 2
47
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213
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214 # Eggs don't move
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215
171
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216 def hatch(self):
243
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217 self.timer -= 1
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218 if self.timer == 0:
171
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219 return Chicken(self.pos)
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220 return None
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221
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222 class Fox(Animal):
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223 """A fox"""
25
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224
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225 STEALTH = 20
130
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226 IMAGE_FILE = 'sprites/fox.png'
114
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227
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228 costs = {
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229 # weighting for movement calculation
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230 'grassland' : 2,
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231 'woodland' : 1, # Try to keep to the woods if possible
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232 'broken fence' : 2,
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233 'fence' : 10,
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234 'guardtower' : 2, # We can pass under towers
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235 'henhouse' : 30, # Don't go into a henhouse unless we're going to
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236 # catch a chicken there
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237 'hendominium' : 30,
70
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238 }
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239
28
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240 def __init__(self, pos):
130
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241 image_left = imagecache.load_image(self.IMAGE_FILE)
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242 image_right = imagecache.load_image(self.IMAGE_FILE, ("right_facing",))
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243 Animal.__init__(self, image_left, image_right, pos)
70
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244 self.landmarks = [self.pos]
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245 self.hunting = True
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246 self.dig_pos = None
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247 self.tick = 0
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248 self.safe = False
145
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249 self.closest = None
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250 self.last_steps = []
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251
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252 def _cost_tile(self, pos, gameboard):
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253 if gameboard.in_bounds(pos):
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254 this_tile = gameboard.tv.get(pos.to_tuple())
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255 cost = self.costs.get(tiles.TILE_MAP[this_tile], 100)
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256 else:
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257 cost = 100 # Out of bounds is expensive
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258 return cost
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259
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260 def _cost_path(self, path, gameboard):
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261 """Calculate the cost of a path"""
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262 total = 0
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263 for pos in path:
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264 total += self._cost_tile(pos, gameboard)
70
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diff changeset
265 return total
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266
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267 def _gen_path(self, start_pos, final_pos):
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268 """Construct a direct path from start_pos to final_pos,
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269 excluding start_pos"""
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270 if abs(start_pos.x - final_pos.x) < 2 and \
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271 abs(start_pos.y - final_pos.y) < 2:
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272 # pgu gets this case wrong on occasion.
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273 return [final_pos]
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274 start = start_pos.to_tuple()
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275 end = final_pos.to_tuple()
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276 points = getline(start, end)
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277 points.remove(start) # exclude start_pos
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278 if end not in points:
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279 # Rounding errors in getline cause this
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280 points.append(end)
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281 return [Position(x[0], x[1]) for x in points]
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282
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283 def _find_best_path_step(self, final_pos, gameboard):
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284 """Find the cheapest path to final_pos, and return the next step
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285 along the path."""
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286 # We calculate the cost of the direct path
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287 direct_path = self._gen_path(self.pos, final_pos)
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288 min_cost = self._cost_path(direct_path, gameboard)
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289 min_path = direct_path
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290 # is there a point nearby that gives us a cheaper direct path?
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291 # This is delibrately not finding the optimal path, as I don't
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292 # want the foxes to be too intelligent, although the implementation
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293 # isn't well optimised yet
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294 poss = [Position(x, y) for x in range(self.pos.x - 3, self.pos.x + 4)
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295 for y in range(self.pos.y - 3, self.pos.y + 4)
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296 if (x, y) != (0,0)]
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297 for start in poss:
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298 cand_path = self._gen_path(self.pos, start) + \
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299 self._gen_path(start, final_pos)
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300 cost = self._cost_path(cand_path, gameboard)
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301 if cost < min_cost:
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302 min_cost = cost
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303 min_path = cand_path
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304 if not min_path:
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305 return final_pos
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306 return min_path[0]
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307
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308 def _find_path_to_woodland(self, gameboard):
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309 """Dive back to woodland through the landmarks"""
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310 # find the closest point to our current location in walked path
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311 if self.pos == self.landmarks[-1]:
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312 if len(self.landmarks) > 1:
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313 self.landmarks.pop() # Moving to the next landmark
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314 else:
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315 # Safely back at the start
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316 self.safe = True
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317 return self.pos
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318 return self._find_best_path_step(self.landmarks[-1], gameboard)
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319
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320 def _find_path_to_chicken(self, gameboard):
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321 """Find the path to the closest chicken"""
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322 # Find the closest chicken
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323 min_dist = 999
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324 if self.closest not in gameboard.chickens:
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325 # Either no target, or someone ate it
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326 self.closest = None
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327 for chicken in gameboard.chickens:
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328 dist = chicken.pos.dist(self.pos)
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329 if chicken.abode:
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330 dist += 10 # Prefer free-ranging chickens
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331 if dist < min_dist:
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332 min_dist = dist
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333 self.closest = chicken
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334 if not self.closest:
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335 # No more chickens, so leave
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336 self.hunting = False
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337 return self.pos
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338 if self.closest.pos == self.pos:
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339 # Caught a chicken
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340 self._catch_chicken(self.closest, gameboard)
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341 return self.pos
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342 return self._find_best_path_step(self.closest.pos, gameboard)
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343
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344 def _catch_chicken(self, chicken, gameboard):
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345 """Catch a chicken"""
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346 if not chicken.survive_damage():
158
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347 sound.play_sound("kill-chicken.ogg")
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348 gameboard.remove_chicken(chicken)
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349 self.closest = None
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350 self.hunting = False
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351 self.last_steps = [] # Forget history here
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352
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353 def _update_pos(self, gameboard, new_pos):
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354 """Update the position, making sure we don't step on other foxes"""
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355 if new_pos == self.pos:
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356 # We're not moving, so we can skip all the checks
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357 return new_pos
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358 final_pos = new_pos
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359 blocked = final_pos in self.last_steps
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360 moves = [Position(x, y) for x in range(self.pos.x-1, self.pos.x + 2)
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361 for y in range(self.pos.y-1, self.pos.y + 2)
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362 if Position(x,y) != self.pos and \
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363 Position(x, y) not in self.last_steps]
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364 for fox in gameboard.foxes:
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365 if fox is not self and fox.pos == final_pos:
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366 blocked = True
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367 if fox.pos in moves:
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368 moves.remove(fox.pos)
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369 if blocked:
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370 # find the cheapest point in moves to new_pos that's not blocked
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371 final_pos = None
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372 min_cost = 1000
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373 for poss in moves:
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374 cost = self._cost_tile(poss, gameboard)
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375 if cost < min_cost:
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376 min_cost = cost
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377 final_pos = poss
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378 if not final_pos:
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379 # No good choice, so stay put
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380 return self.pos
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381 if gameboard.in_bounds(final_pos):
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382 this_tile = gameboard.tv.get(final_pos.to_tuple())
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383 else:
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384 this_tile = tiles.REVERSE_TILE_MAP['woodland']
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385 if tiles.TILE_MAP[this_tile] == 'broken fence' and self.hunting:
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386 # We'll head back towards the holes we make/find
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387 self.landmarks.append(final_pos)
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388 elif tiles.TILE_MAP[this_tile] == 'fence' and not self.dig_pos:
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389 self._dig(gameboard, final_pos)
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390 return self.pos
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391 self.last_steps.append(final_pos)
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392 if len(self.last_steps) > 3:
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393 self.last_steps.pop(0)
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394 return final_pos
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395
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396 def _dig(self, gameboard, dig_pos):
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397 """Setup dig parameters, to be overridden if needed"""
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398 self.tick = 5
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399 self.dig_pos = dig_pos
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400
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401 def _make_hole(self, gameboard):
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402 """Make a hole in the fence"""
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403 gameboard.tv.set(self.dig_pos.to_tuple(),
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404 tiles.REVERSE_TILE_MAP['broken fence'])
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405 self.dig_pos = None
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406
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407 def move(self, gameboard):
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408 """Foxes will aim to move towards the closest henhouse or free
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409 chicken"""
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410 if self.dig_pos:
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411 if self.tick:
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412 self.tick -= 1
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413 # We're still digging through the fence
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414 # Check the another fox hasn't dug a hole for us
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415 # We're too busy digging to notice if a hole appears nearby,
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416 # but we'll notice if the fence we're digging vanishes
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417 this_tile = gameboard.tv.get(self.dig_pos.to_tuple())
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diff changeset
418 if tiles.TILE_MAP[this_tile] == 'broken fence':
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419 self.tick = 0
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420 return
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421 else:
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422 # We've dug through the fence, so make a hole
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423 self._make_hole(gameboard)
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424 return
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425 if self.hunting:
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426 desired_pos = self._find_path_to_chicken(gameboard)
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427 else:
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428 desired_pos = self._find_path_to_woodland(gameboard)
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429 final_pos = self._update_pos(gameboard, desired_pos)
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430 self._fix_face(final_pos)
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431 self.pos = final_pos
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432
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433 class NinjaFox(Fox):
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434 """Ninja foxes are hard to see"""
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435
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436 STEALTH = 60
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437 IMAGE_FILE = 'sprites/ninja_fox.png'
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438
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439 class DemoFox(Fox):
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440 """Demolition Foxes destroy fences easily"""
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441
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442 DIG_ANIMATION = animations.FenceExplosion
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443 IMAGE_FILE = 'sprites/sapper_fox.png'
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444
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445 def _dig(self, gameboard, dig_pos):
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446 """Setup dig parameters, to be overridden if needed"""
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447 self.tick = 0 # Costs us nothing to go through a fence.
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448 self.dig_pos = dig_pos
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449 gameboard.animations.append(self.DIG_ANIMATION(dig_pos))
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450 self._make_hole(gameboard)
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451
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452 class GreedyFox(Fox):
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453 """Greedy foxes eat more chickens"""
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454
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455 def __init__(self, pos):
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456 Fox.__init__(self, pos)
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457 self.chickens_eaten = 0
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458
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459 def _catch_chicken(self, chicken, gameboard):
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460 gameboard.remove_chicken(chicken)
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461 self.closest = None
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462 self.chickens_eaten += 1
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463 if self.chickens_eaten > 2:
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464 self.hunting = False
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465 self.last_steps = []
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466
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467 def _get_vision_param(parameter, watcher):
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468 param = getattr(watcher, parameter)
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469 if watcher.abode:
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470 modifier = getattr(watcher.abode.building, 'MODIFY_'+parameter, lambda r: r)
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471 param = modifier(param)
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472 return param
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473
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474 def visible(watcher, watchee):
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475 vision_bonus = _get_vision_param('VISION_BONUS', watcher)
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476 range_penalty = _get_vision_param('VISION_RANGE_PENALTY', watcher)
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477 distance = watcher.pos.dist(watchee.pos) - 1
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478 roll = random.randint(1, 100)
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479 return roll > watchee.STEALTH - vision_bonus + range_penalty*distance