Mercurial > rinkhals

annotate gamelib/animal.py @ 171:9ea53eb919cf

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Make Animals accept Positions when created. move hatch watching from Chicken to Egg
author Neil Muller <drnlmuller@gmail.com>
date Thu, 03 Sep 2009 23:00:29 +0000
parents 0d6e23dcd3af
children ff168162974e
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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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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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14 class Animal(Sprite):
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15 """Base class for animals"""
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17 STEALTH = 0
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18
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19 def __init__(self, image_left, image_right, tile_pos):
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20 # Create the animal somewhere far off screen
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21 Sprite.__init__(self, image_left, (-1000, -1000))
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22 self._image_left = image_left
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23 self.image_left = image_left.copy()
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24 self._image_right = image_right
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25 self.image_right = image_right.copy()
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26 if hasattr(tile_pos, 'to_tuple'):
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27 self.pos = tile_pos
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28 else:
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29 self.pos = Position(tile_pos[0], tile_pos[1])
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30 self.equipment = []
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31 self.abode = None
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32 self.facing = 'left'
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33 self.lives = 1
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35 def loop(self, tv, _sprite):
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36 ppos = tv.tile_to_view(self.pos.to_tuple())
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37 self.rect.x = ppos[0]
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38 self.rect.y = ppos[1]
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40 def move(self, state):
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41 """Given the game state, return a new position for the object"""
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42 # Default is not to move
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43 pass
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45 def set_pos(self, tile_pos):
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46 """Move an animal to the given tile_pos."""
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47 new_pos = Position(*tile_pos)
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48 self._fix_face(new_pos)
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49 self.pos = new_pos
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51 def _fix_face(self, final_pos):
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52 """Set the face correctly"""
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53 if final_pos.left_of(self.pos):
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54 self._set_image_facing('left')
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55 elif final_pos.right_of(self.pos):
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56 self._set_image_facing('right')
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57
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58 def _set_image_facing(self, facing):
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59 self.facing = facing
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60 if self.facing == 'left':
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61 self.setimage(self.image_left)
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62 elif self.facing == 'right':
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63 self.setimage(self.image_right)
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65 def equip(self, item):
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66 self.equipment.append(item)
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67 self.redraw()
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69 def unequip(self, item):
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70 self.equipment = [e for e in self.equipment if e != item]
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71 self.redraw()
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73 def redraw(self):
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74 self.image_left = self._image_left.copy()
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75 self.image_right = self._image_right.copy()
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76 self.equipment.sort(key=lambda x: x.DRAW_LAYER)
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77 for item in self.equipment:
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78 self.draw_equipment(item)
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79 self._set_image_facing(self.facing)
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81 def draw_equipment(self, item):
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82 if not hasattr(self, 'EQUIPMENT_IMAGE_ATTRIBUTE'):
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83 return
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84 eq_image_attr = getattr(item, self.EQUIPMENT_IMAGE_ATTRIBUTE, 'None')
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85 if not eq_image_attr:
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86 return
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87 eq_image_left = imagecache.load_image(eq_image_attr)
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88 eq_image_right = imagecache.load_image(eq_image_attr, ("right_facing",))
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89 self.image_left.blit(eq_image_left, (0, 0))
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90 self.image_right.blit(eq_image_right, (0, 0))
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91
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92 def weapons(self):
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93 return [e for e in self.equipment if equipment.is_weapon(e)]
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94
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95 def covers(self, tile_pos):
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96 return tile_pos[0] == self.pos.x and tile_pos[1] == self.pos.y
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97
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98 def outside(self):
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99 return self.abode is None
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100
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101 class Chicken(Animal):
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102 """A chicken"""
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103
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104 EQUIPMENT_IMAGE_ATTRIBUTE = 'CHICKEN_IMAGE_FILE'
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105
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106 def __init__(self, pos):
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107 image_left = imagecache.load_image('sprites/chkn.png')
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108 image_right = imagecache.load_image('sprites/chkn.png',
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109 ("right_facing",))
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110 Animal.__init__(self, image_left, image_right, pos)
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111 self.egg = None
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112 self.egg_counter = 0
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113
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114 def move(self, gameboard):
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115 """A free chicken will move away from other free chickens"""
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116 pass
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117
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118 def lay(self):
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119 """See if the chicken lays an egg"""
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120 if not self.egg:
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121 self.egg = Egg(self.pos)
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122
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123 def hatch(self):
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124 """See if we have an egg to hatch"""
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125 if self.egg:
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126 return self.egg.hatch()
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127 return None
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128
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129 def _find_killable_fox(self, weapon, gameboard):
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130 """Choose a random fox within range of this weapon."""
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131 killable_foxes = []
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132 for fox in gameboard.foxes:
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133 if not visible(self, fox):
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134 continue
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135 if weapon.in_range(gameboard, self, fox):
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136 killable_foxes.append(fox)
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137 if not killable_foxes:
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138 return None
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139 return random.choice(killable_foxes)
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140
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141 def attack(self, gameboard):
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142 """An armed chicken will attack a fox within range."""
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143 if not self.weapons():
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144 # Not going to take on a fox bare-winged.
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145 return
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146 # Choose the first weapon equipped.
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147 weapon = self.weapons()[0]
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148 fox = self._find_killable_fox(weapon, gameboard)
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149 if not fox:
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150 return
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151 if weapon.hit(gameboard, self, fox):
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152 sound.play_sound("kill-fox.ogg")
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153 gameboard.kill_fox(fox)
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154
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155 class Egg(Animal):
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156 """An egg"""
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157
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158 def __init__(self, pos):
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159 image = imagecache.load_image('sprites/egg.png')
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160 Animal.__init__(self, image, image, pos)
171
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161 self.counter = 2
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162
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163 # Eggs don't move
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164
171
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165 def hatch(self):
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166 self.counter -= 1
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167 if self.counter == 0:
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168 return Chicken(self.pos)
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169 return None
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170
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171 class Fox(Animal):
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172 """A fox"""
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173
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174 STEALTH = 20
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175 IMAGE_FILE = 'sprites/fox.png'
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176
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177 costs = {
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178 # weighting for movement calculation
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179 'grassland' : 2,
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180 'woodland' : 1, # Try to keep to the woods if possible
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181 'broken fence' : 2,
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182 'fence' : 10,
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183 'guardtower' : 2, # We can pass under towers
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184 'henhouse' : 30, # Don't go into a henhouse unless we're going to
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185 # catch a chicken there
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186 'hendominium' : 30,
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187 }
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188
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189 def __init__(self, pos):
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190 image_left = imagecache.load_image(self.IMAGE_FILE)
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191 image_right = imagecache.load_image(self.IMAGE_FILE, ("right_facing",))
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192 Animal.__init__(self, image_left, image_right, pos)
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193 self.landmarks = [self.pos]
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194 self.hunting = True
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195 self.dig_pos = None
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196 self.tick = 0
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197 self.safe = False
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198 self.closest = None
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199 self.last_steps = []
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200
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201 def _cost_tile(self, pos, gameboard):
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202 if gameboard.in_bounds(pos):
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203 this_tile = gameboard.tv.get(pos.to_tuple())
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204 cost = self.costs.get(tiles.TILE_MAP[this_tile], 100)
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205 else:
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206 cost = 100 # Out of bounds is expensive
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207 return cost
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208
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209 def _cost_path(self, path, gameboard):
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210 """Calculate the cost of a path"""
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211 total = 0
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212 for pos in path:
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213 total += self._cost_tile(pos, gameboard)
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214 return total
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215
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216 def _gen_path(self, start_pos, final_pos):
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217 """Construct a direct path from start_pos to final_pos,
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218 excluding start_pos"""
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219 if abs(start_pos.x - final_pos.x) < 2 and \
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220 abs(start_pos.y - final_pos.y) < 2:
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221 # pgu gets this case wrong on occasion.
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222 return [final_pos]
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223 start = start_pos.to_tuple()
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224 end = final_pos.to_tuple()
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225 points = getline(start, end)
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226 points.remove(start) # exclude start_pos
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227 if end not in points:
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228 # Rounding errors in getline cause this
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229 points.append(end)
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230 return [Position(x[0], x[1]) for x in points]
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231
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232 def _find_best_path_step(self, final_pos, gameboard):
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233 """Find the cheapest path to final_pos, and return the next step
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234 along the path."""
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235 # We calculate the cost of the direct path
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236 direct_path = self._gen_path(self.pos, final_pos)
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237 min_cost = self._cost_path(direct_path, gameboard)
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238 min_path = direct_path
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239 # is there a point nearby that gives us a cheaper direct path?
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240 # This is delibrately not finding the optimal path, as I don't
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241 # want the foxes to be too intelligent, although the implementation
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242 # isn't well optimised yet
82
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243 poss = [Position(x, y) for x in range(self.pos.x - 3, self.pos.x + 4)
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244 for y in range(self.pos.y - 3, self.pos.y + 4)
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245 if (x, y) != (0,0)]
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246 for start in poss:
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247 cand_path = self._gen_path(self.pos, start) + \
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248 self._gen_path(start, final_pos)
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249 cost = self._cost_path(cand_path, gameboard)
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250 if cost < min_cost:
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251 min_cost = cost
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252 min_path = cand_path
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253 if not min_path:
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254 return final_pos
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255 return min_path[0]
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256
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257 def _find_path_to_woodland(self, gameboard):
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258 """Dive back to woodland through the landmarks"""
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259 # find the closest point to our current location in walked path
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260 if self.pos == self.landmarks[-1]:
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261 if len(self.landmarks) > 1:
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262 self.landmarks.pop() # Moving to the next landmark
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263 else:
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264 # Safely back at the start
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265 self.safe = True
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266 return self.pos
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267 return self._find_best_path_step(self.landmarks[-1], gameboard)
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268
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269 def _find_path_to_chicken(self, gameboard):
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270 """Find the path to the closest chicken"""
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271 # Find the closest chicken
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272 min_dist = 999
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273 if self.closest not in gameboard.chickens:
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274 # Either no target, or someone ate it
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275 for chicken in gameboard.chickens:
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276 dist = chicken.pos.dist(self.pos)
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277 if chicken.abode:
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278 dist += 10 # Prefer free-ranging chickens
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279 if dist < min_dist:
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280 min_dist = dist
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281 self.closest = chicken
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282 if not self.closest:
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283 # No more chickens, so leave
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284 self.hunting = False
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285 return self.pos
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286 if self.closest.pos == self.pos:
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287 # Caught a chicken
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288 self._catch_chicken(self.closest, gameboard)
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289 return self.pos
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290 return self._find_best_path_step(self.closest.pos, gameboard)
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291
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292 def _catch_chicken(self, chicken, gameboard):
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293 """Catch a chicken"""
158
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294 chicken.lives -= 1
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295 if not chicken.lives > 0:
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296 sound.play_sound("kill-chicken.ogg")
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297 gameboard.remove_chicken(chicken)
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298 self.closest = None
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299 self.hunting = False
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300 self.last_steps = [] # Forget history here
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301
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302 def _update_pos(self, gameboard, new_pos):
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303 """Update the position, making sure we don't step on other foxes"""
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304 if new_pos == self.pos:
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305 # We're not moving, so we can skip all the checks
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306 return new_pos
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307 final_pos = new_pos
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308 blocked = final_pos in self.last_steps
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309 moves = [Position(x, y) for x in range(self.pos.x-1, self.pos.x + 2)
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310 for y in range(self.pos.y-1, self.pos.y + 2)
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311 if Position(x,y) != self.pos and \
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312 Position(x, y) not in self.last_steps]
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313 for fox in gameboard.foxes:
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314 if fox is not self and fox.pos == final_pos:
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315 blocked = True
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316 if fox.pos in moves:
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317 moves.remove(fox.pos)
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318 if blocked:
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319 # find the cheapest point in moves to new_pos that's not blocked
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320 final_pos = None
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321 min_cost = 1000
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322 for poss in moves:
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323 cost = self._cost_tile(poss, gameboard)
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324 if cost < min_cost:
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325 min_cost = cost
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326 final_pos = poss
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327 if not final_pos:
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328 # No good choice, so stay put
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329 return self.pos
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330 if gameboard.in_bounds(final_pos):
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331 this_tile = gameboard.tv.get(final_pos.to_tuple())
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332 else:
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333 this_tile = tiles.REVERSE_TILE_MAP['woodland']
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334 if tiles.TILE_MAP[this_tile] == 'broken fence' and self.hunting:
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335 # We'll head back towards the holes we make/find
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336 self.landmarks.append(final_pos)
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337 elif tiles.TILE_MAP[this_tile] == 'fence' and not self.dig_pos:
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338 self._dig(final_pos)
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339 return self.pos
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340 self.last_steps.append(final_pos)
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341 if len(self.last_steps) > 3:
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342 self.last_steps.pop(0)
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343 return final_pos
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344
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345 def _dig(self, dig_pos):
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346 """Setup dig parameters, to be overridden if needed"""
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347 self.tick = 5
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348 self.dig_pos = dig_pos
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349
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350 def _make_hole(self, gameboard):
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351 """Make a hole in the fence"""
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352 gameboard.tv.set(self.dig_pos.to_tuple(),
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353 tiles.REVERSE_TILE_MAP['broken fence'])
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354 self.dig_pos = None
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355
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356 def move(self, gameboard):
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357 """Foxes will aim to move towards the closest henhouse or free
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358 chicken"""
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359 if self.dig_pos:
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360 if self.tick:
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361 self.tick -= 1
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362 # We're still digging through the fence
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363 # Check the another fox hasn't dug a hole for us
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364 # We're too busy digging to notice if a hole appears nearby,
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365 # but we'll notice if the fence we're digging vanishes
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366 this_tile = gameboard.tv.get(self.dig_pos.to_tuple())
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367 if tiles.TILE_MAP[this_tile] == 'broken fence':
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368 self.tick = 0
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369 return
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370 else:
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371 # We've dug through the fence, so make a hole
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372 self._make_hole(gameboard)
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373 return
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374 if self.hunting:
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375 desired_pos = self._find_path_to_chicken(gameboard)
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376 else:
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377 desired_pos = self._find_path_to_woodland(gameboard)
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378 final_pos = self._update_pos(gameboard, desired_pos)
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379 self._fix_face(final_pos)
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380 self.pos = final_pos
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381
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382 class NinjaFox(Fox):
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383 """Ninja foxes are hard to see"""
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384
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385 STEALTH = 60
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386 IMAGE_FILE = 'sprites/ninja_fox.png'
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387
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388 class DemoFox(Fox):
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389 """Demolition Foxes destroy fences easily"""
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390
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391 class GreedyFox(Fox):
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392 """Greedy foxes eat more chickens"""
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393
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394 def __init__(self, pos):
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395 Fox.__init__(self, pos)
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396 self.chickens_eaten = 0
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397
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398 def _catch_chicken(self, chicken, gameboard):
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399 gameboard.remove_chicken(chicken)
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400 self.closest = None
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401 self.chickens_eaten += 1
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402 if self.chickens_eaten > 2:
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403 self.hunting = False
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404 self.last_steps = []
114
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405
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406 def visible(watcher, watchee):
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407 roll = random.randint(1, 100)
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408 distance = watcher.pos.dist(watchee.pos) - 1
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409 return roll > watchee.STEALTH + 10*distance