Mercurial > rinkhals

annotate gamelib/animal.py @ 251:844bfb23d4b6

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Refactored animal death and added death animations.
author Jeremy Thurgood <firxen@gmail.com>
date Sat, 05 Sep 2009 12:35:37 +0000
parents 4f86c2616cdf
children fcaae2cfe3cd
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1 """Class for the various animals in the game"""
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3 import random
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5 from pgu.vid import Sprite
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6 from pgu.algo import getline
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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 die(self, gameboard):
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44 """Play death animation, noises, whatever."""
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45 if hasattr(self, 'DEATH_SOUND'):
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46 sound.play_sound(self.DEATH_SOUND)
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47 if hasattr(self, 'DEATH_ANIMATION'):
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48 gameboard.animations.append(self.DEATH_ANIMATION(self.pos))
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49 self._game_death(gameboard)
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51 def _game_death(self, gameboard):
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52 # Call appropriate gameboard cleanup here.
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53 pass
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55 def move(self, state):
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56 """Given the game state, return a new position for the object"""
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57 # Default is not to move
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58 pass
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60 def set_pos(self, tile_pos):
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61 """Move an animal to the given tile_pos."""
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62 new_pos = Position(*tile_pos)
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63 self._fix_face(new_pos)
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64 self.pos = new_pos
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65
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66 def _fix_face(self, facing_pos):
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67 """Set the face correctly"""
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68 if facing_pos.left_of(self.pos):
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69 self._set_image_facing('left')
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70 elif facing_pos.right_of(self.pos):
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71 self._set_image_facing('right')
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72
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73 def _set_image_facing(self, facing):
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74 self.facing = facing
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75 if self.facing == 'left':
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76 self.setimage(self.image_left)
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77 elif self.facing == 'right':
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78 self.setimage(self.image_right)
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80 def equip(self, item):
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81 if equipment.is_equipment(item):
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82 self.equipment.append(item)
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83 elif equipment.is_accoutrement(item):
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84 self.accoutrements.append(item)
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85 self.redraw()
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87 def unequip(self, item):
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88 if equipment.is_equipment(item):
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89 self.equipment = [e for e in self.equipment if e != item]
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90 elif equipment.is_accoutrement(item):
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91 self.accoutrements = [e for e in self.accoutrements if e != item]
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92 self.redraw()
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93
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94 def unequip_by_name(self, item_name):
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95 # only remove first match
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96 matches = [item for item in self.equipment + self.accoutrements if item.NAME == item_name]
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97 if matches:
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98 self.unequip(matches[0])
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99
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100 def redraw(self):
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101 layers = [(self._image_left.copy(), self._image_right.copy(), 0)]
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102 if hasattr(self, 'EQUIPMENT_IMAGE_ATTRIBUTE'):
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103 for item in self.accoutrements + self.equipment:
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104 images = item.images(self.EQUIPMENT_IMAGE_ATTRIBUTE)
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105 if images:
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106 layers.append(images)
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107
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108 layers.sort(key=lambda l: l[2])
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110 # these always go on the bottom so that other layers don't get overwritten
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111 self.image_left = self._image_left.copy()
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112 self.image_right = self._image_right.copy()
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113 for l in layers:
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114 self.image_left.blit(l[0], (0,0))
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115 self.image_right.blit(l[1], (0,0))
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116
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117 self._set_image_facing(self.facing)
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118
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119 def weapons(self):
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120 return [e for e in self.equipment if equipment.is_weapon(e)]
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121
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122 def armour(self):
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123 return [e for e in self.equipment if equipment.is_armour(e)]
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124
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125 def covers(self, tile_pos):
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126 return tile_pos[0] == self.pos.x and tile_pos[1] == self.pos.y
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127
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128 def outside(self):
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129 return self.abode is None
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130
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131 def damage(self, gameboard):
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132 for a in self.armour():
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133 if not a.survive_damage():
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134 self.unequip(a)
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135 return True
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136 self.die(gameboard)
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137 return False
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138
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139 class Chicken(Animal):
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140 """A chicken"""
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141
146
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142 EQUIPMENT_IMAGE_ATTRIBUTE = 'CHICKEN_IMAGE_FILE'
251
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143 DEATH_ANIMATION = animations.ChickenDeath
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144 DEATH_SOUND = 'kill-chicken.ogg'
146
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145
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146 def __init__(self, pos):
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147 image_left = imagecache.load_image('sprites/chkn.png')
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148 image_right = imagecache.load_image('sprites/chkn.png',
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149 ("right_facing",))
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150 Animal.__init__(self, image_left, image_right, pos)
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151 self.eggs = []
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152
251
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153 def _game_death(self, gameboard):
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154 gameboard.remove_chicken(self)
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155
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156 def move(self, gameboard):
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157 """A free chicken will move away from other free chickens"""
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158 pass
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159
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160 def lay(self):
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161 """See if the chicken lays an egg"""
243
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162 if not self.eggs:
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163 for x in range(random.randint(1, 4)):
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164 self.eggs.append(Egg(self.pos))
216
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165 self.equip(equipment.NestEgg())
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166
243
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167 def remove_eggs(self):
216
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168 """Clean up the egg state"""
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169 self.eggs = []
216
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170 self.unequip_by_name("nestegg")
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171
243
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172 def remove_one_egg(self):
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173 """Clean up the egg state"""
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174 self.eggs.pop()
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175 if not self.eggs:
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176 self.unequip_by_name("nestegg")
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177
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178 def get_num_eggs(self):
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179 return len(self.eggs)
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180
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181 def hatch(self, gameboard):
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182 """See if we have an egg to hatch"""
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183 if self.eggs:
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184 chick = self.eggs[0].hatch()
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185 if chick:
243
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186 # sell the remaining eggs
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187 # Remove hatched egg
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188 self.eggs.pop()
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189 gameboard.eggs -= 1
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190 # Sell other eggs
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191 for egg in self.eggs[:]:
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192 gameboard.sell_one_egg(self)
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193 self.remove_eggs() # clean up stale images, etc.
187
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194 return chick
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195 return None
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196
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197 def _find_killable_fox(self, weapon, gameboard):
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198 """Choose a random fox within range of this weapon."""
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199 killable_foxes = []
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200 for fox in gameboard.foxes:
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201 if not visible(self, fox):
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202 continue
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203 if weapon.in_range(gameboard, self, fox):
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204 killable_foxes.append(fox)
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205 if not killable_foxes:
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206 return None
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207 return random.choice(killable_foxes)
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208
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209 def attack(self, gameboard):
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210 """An armed chicken will attack a fox within range."""
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211 if not self.weapons():
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212 # Not going to take on a fox bare-winged.
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213 return
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214 # Choose the first weapon equipped.
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215 weapon = self.weapons()[0]
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216 fox = self._find_killable_fox(weapon, gameboard)
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217 if not fox:
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218 return
236
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219 self._fix_face(fox.pos)
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220 if weapon.hit(gameboard, self, fox):
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221 fox.damage(gameboard)
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222
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223 class Egg(Animal):
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224 """An egg"""
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225
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226 def __init__(self, pos):
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227 image = imagecache.load_image('sprites/egg.png')
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228 Animal.__init__(self, image, image, pos)
243
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229 self.timer = 2
47
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230
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231 # Eggs don't move
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232
171
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233 def hatch(self):
243
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234 self.timer -= 1
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235 if self.timer == 0:
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236 return Chicken(self.pos)
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237 return None
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238
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239 class Fox(Animal):
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240 """A fox"""
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241
114
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242 STEALTH = 20
130
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243 IMAGE_FILE = 'sprites/fox.png'
251
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244 DEATH_ANIMATION = animations.FoxDeath
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245 DEATH_SOUND = 'kill-fox.ogg'
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246
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247 costs = {
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248 # weighting for movement calculation
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249 'grassland' : 2,
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250 'woodland' : 1, # Try to keep to the woods if possible
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251 'broken fence' : 2,
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252 'fence' : 10,
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253 'guardtower' : 2, # We can pass under towers
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254 'henhouse' : 30, # Don't go into a henhouse unless we're going to
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255 # catch a chicken there
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256 'hendominium' : 30,
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257 }
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258
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diff changeset
259 def __init__(self, pos):
130
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260 image_left = imagecache.load_image(self.IMAGE_FILE)
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261 image_right = imagecache.load_image(self.IMAGE_FILE, ("right_facing",))
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diff changeset
262 Animal.__init__(self, image_left, image_right, pos)
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diff changeset
263 self.landmarks = [self.pos]
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264 self.hunting = True
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265 self.dig_pos = None
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266 self.tick = 0
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diff changeset
267 self.safe = False
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268 self.closest = None
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diff changeset
269 self.last_steps = []
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diff changeset
270
251
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271 def _game_death(self, gameboard):
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272 gameboard.kill_fox(self)
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273
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diff changeset
274 def _cost_tile(self, pos, gameboard):
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275 if gameboard.in_bounds(pos):
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276 this_tile = gameboard.tv.get(pos.to_tuple())
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diff changeset
277 cost = self.costs.get(tiles.TILE_MAP[this_tile], 100)
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diff changeset
278 else:
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279 cost = 100 # Out of bounds is expensive
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280 return cost
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diff changeset
281
70
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diff changeset
282 def _cost_path(self, path, gameboard):
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diff changeset
283 """Calculate the cost of a path"""
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diff changeset
284 total = 0
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285 for pos in path:
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286 total += self._cost_tile(pos, gameboard)
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287 return total
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288
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289 def _gen_path(self, start_pos, final_pos):
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290 """Construct a direct path from start_pos to final_pos,
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291 excluding start_pos"""
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292 if abs(start_pos.x - final_pos.x) < 2 and \
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293 abs(start_pos.y - final_pos.y) < 2:
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294 # pgu gets this case wrong on occasion.
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295 return [final_pos]
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296 start = start_pos.to_tuple()
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297 end = final_pos.to_tuple()
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298 points = getline(start, end)
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299 points.remove(start) # exclude start_pos
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300 if end not in points:
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301 # Rounding errors in getline cause this
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302 points.append(end)
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303 return [Position(x[0], x[1]) for x in points]
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304
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305 def _find_best_path_step(self, final_pos, gameboard):
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306 """Find the cheapest path to final_pos, and return the next step
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307 along the path."""
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308 # We calculate the cost of the direct path
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309 direct_path = self._gen_path(self.pos, final_pos)
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310 min_cost = self._cost_path(direct_path, gameboard)
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311 min_path = direct_path
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312 # is there a point nearby that gives us a cheaper direct path?
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313 # This is delibrately not finding the optimal path, as I don't
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314 # want the foxes to be too intelligent, although the implementation
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315 # isn't well optimised yet
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316 poss = [Position(x, y) for x in range(self.pos.x - 3, self.pos.x + 4)
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317 for y in range(self.pos.y - 3, self.pos.y + 4)
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318 if (x, y) != (0,0)]
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319 for start in poss:
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320 cand_path = self._gen_path(self.pos, start) + \
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321 self._gen_path(start, final_pos)
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322 cost = self._cost_path(cand_path, gameboard)
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323 if cost < min_cost:
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324 min_cost = cost
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325 min_path = cand_path
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326 if not min_path:
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327 return final_pos
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328 return min_path[0]
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329
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330 def _find_path_to_woodland(self, gameboard):
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331 """Dive back to woodland through the landmarks"""
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332 # find the closest point to our current location in walked path
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333 if self.pos == self.landmarks[-1]:
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334 if len(self.landmarks) > 1:
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335 self.landmarks.pop() # Moving to the next landmark
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336 else:
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337 # Safely back at the start
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338 self.safe = True
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339 return self.pos
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340 return self._find_best_path_step(self.landmarks[-1], gameboard)
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341
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342 def _find_path_to_chicken(self, gameboard):
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343 """Find the path to the closest chicken"""
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344 # Find the closest chicken
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345 min_dist = 999
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346 if self.closest not in gameboard.chickens:
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347 # Either no target, or someone ate it
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348 self.closest = None
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349 for chicken in gameboard.chickens:
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350 dist = chicken.pos.dist(self.pos)
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351 if chicken.abode:
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352 dist += 10 # Prefer free-ranging chickens
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353 if dist < min_dist:
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354 min_dist = dist
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355 self.closest = chicken
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356 if not self.closest:
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357 # No more chickens, so leave
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358 self.hunting = False
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359 return self.pos
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360 if self.closest.pos == self.pos:
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361 # Caught a chicken
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362 self._catch_chicken(self.closest, gameboard)
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363 return self.pos
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364 return self._find_best_path_step(self.closest.pos, gameboard)
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365
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366 def _catch_chicken(self, chicken, gameboard):
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367 """Catch a chicken"""
251
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368 chicken.damage(gameboard)
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369 self.closest = None
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370 self.hunting = False
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371 self.last_steps = [] # Forget history here
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372
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373 def _update_pos(self, gameboard, new_pos):
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374 """Update the position, making sure we don't step on other foxes"""
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375 if new_pos == self.pos:
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376 # We're not moving, so we can skip all the checks
149
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377 return new_pos
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378 final_pos = new_pos
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379 blocked = final_pos in self.last_steps
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380 moves = [Position(x, y) for x in range(self.pos.x-1, self.pos.x + 2)
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381 for y in range(self.pos.y-1, self.pos.y + 2)
149
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382 if Position(x,y) != self.pos and \
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383 Position(x, y) not in self.last_steps]
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384 for fox in gameboard.foxes:
149
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385 if fox is not self and fox.pos == final_pos:
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386 blocked = True
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387 if fox.pos in moves:
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388 moves.remove(fox.pos)
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389 if blocked:
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390 # find the cheapest point in moves to new_pos that's not blocked
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391 final_pos = None
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392 min_cost = 1000
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393 for poss in moves:
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394 cost = self._cost_tile(poss, gameboard)
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395 if cost < min_cost:
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396 min_cost = cost
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397 final_pos = poss
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398 if not final_pos:
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399 # No good choice, so stay put
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400 return self.pos
72
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diff changeset
401 if gameboard.in_bounds(final_pos):
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diff changeset
402 this_tile = gameboard.tv.get(final_pos.to_tuple())
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403 else:
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diff changeset
404 this_tile = tiles.REVERSE_TILE_MAP['woodland']
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diff changeset
405 if tiles.TILE_MAP[this_tile] == 'broken fence' and self.hunting:
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diff changeset
406 # We'll head back towards the holes we make/find
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407 self.landmarks.append(final_pos)
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diff changeset
408 elif tiles.TILE_MAP[this_tile] == 'fence' and not self.dig_pos:
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diff changeset
409 self._dig(gameboard, final_pos)
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diff changeset
410 return self.pos
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411 self.last_steps.append(final_pos)
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diff changeset
412 if len(self.last_steps) > 3:
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413 self.last_steps.pop(0)
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diff changeset
414 return final_pos
28
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diff changeset
415
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diff changeset
416 def _dig(self, gameboard, dig_pos):
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diff changeset
417 """Setup dig parameters, to be overridden if needed"""
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418 self.tick = 5
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419 self.dig_pos = dig_pos
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420
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421 def _make_hole(self, gameboard):
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422 """Make a hole in the fence"""
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423 gameboard.tv.set(self.dig_pos.to_tuple(),
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424 tiles.REVERSE_TILE_MAP['broken fence'])
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425 self.dig_pos = None
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426
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427 def move(self, gameboard):
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428 """Foxes will aim to move towards the closest henhouse or free
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429 chicken"""
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430 if self.dig_pos:
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431 if self.tick:
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432 self.tick -= 1
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433 # We're still digging through the fence
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434 # Check the another fox hasn't dug a hole for us
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435 # We're too busy digging to notice if a hole appears nearby,
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436 # but we'll notice if the fence we're digging vanishes
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437 this_tile = gameboard.tv.get(self.dig_pos.to_tuple())
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438 if tiles.TILE_MAP[this_tile] == 'broken fence':
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439 self.tick = 0
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440 return
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441 else:
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442 # We've dug through the fence, so make a hole
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443 self._make_hole(gameboard)
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444 return
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445 if self.hunting:
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446 desired_pos = self._find_path_to_chicken(gameboard)
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447 else:
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448 desired_pos = self._find_path_to_woodland(gameboard)
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449 final_pos = self._update_pos(gameboard, desired_pos)
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450 self._fix_face(final_pos)
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451 self.pos = final_pos
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452
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453 class NinjaFox(Fox):
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454 """Ninja foxes are hard to see"""
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455
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456 STEALTH = 60
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457 IMAGE_FILE = 'sprites/ninja_fox.png'
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458
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459 class DemoFox(Fox):
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460 """Demolition Foxes destroy fences easily"""
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461
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462 DIG_ANIMATION = animations.FenceExplosion
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463 IMAGE_FILE = 'sprites/sapper_fox.png'
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464
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465 def _dig(self, gameboard, dig_pos):
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466 """Setup dig parameters, to be overridden if needed"""
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467 self.tick = 0 # Costs us nothing to go through a fence.
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468 self.dig_pos = dig_pos
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469 gameboard.animations.append(self.DIG_ANIMATION(dig_pos))
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470 self._make_hole(gameboard)
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471
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472 class GreedyFox(Fox):
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473 """Greedy foxes eat more chickens"""
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474
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475 def __init__(self, pos):
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476 Fox.__init__(self, pos)
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477 self.chickens_eaten = 0
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478
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479 def _catch_chicken(self, chicken, gameboard):
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480 chicken.damage(gameboard)
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481 self.closest = None
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482 self.chickens_eaten += 1
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483 if self.chickens_eaten > 2:
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484 self.hunting = False
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485 self.last_steps = []
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486
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487 def _get_vision_param(parameter, watcher):
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488 param = getattr(watcher, parameter)
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489 if watcher.abode:
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490 modifier = getattr(watcher.abode.building, 'MODIFY_'+parameter, lambda r: r)
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491 param = modifier(param)
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492 return param
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493
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494 def visible(watcher, watchee):
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495 vision_bonus = _get_vision_param('VISION_BONUS', watcher)
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496 range_penalty = _get_vision_param('VISION_RANGE_PENALTY', watcher)
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497 distance = watcher.pos.dist(watchee.pos) - 1
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498 roll = random.randint(1, 100)
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499 return roll > watchee.STEALTH - vision_bonus + range_penalty*distance