Mercurial > rinkhals

annotate gamelib/buildings.py @ 108:437cbd856a03

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Add occupants and abodes. Allowing moving chickens around.
author Simon Cross <hodgestar@gmail.com>
date Wed, 02 Sep 2009 18:42:00 +0000
parents 7e9c8ad06d32
children 48019afde338
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1 """Classes for various buildings in the game."""
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2
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3 from pgu.vid import Sprite
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4
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5 import imagecache
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6 import tiles
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7
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8 class Building(Sprite):
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9 """Base class for buildings"""
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10
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11 GRASSLAND = tiles.REVERSE_TILE_MAP['grassland']
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12
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13 def __init__(self, pos):
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14 """Initial image, tile vid position, size and tile number for building."""
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15 self.day_image = imagecache.load_image(self.IMAGE)
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16 self.night_image = imagecache.load_image(self.IMAGE, ('night',))
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17 self.pos = pos
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18 self.size = self.SIZE
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19 self.tile_no = self.TILE_NO
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20 self._buy_price = self.BUY_PRICE
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21 self._sell_price = self.SELL_PRICE
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22 self._occupants = set()
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23
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24 # Create the building somewhere far off screen
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25 Sprite.__init__(self, self.day_image, (-1000, -1000))
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26
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27 def tile_positions(self):
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28 """Return pairs of (x, y) tile positions for each of the tile positions
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29 occupied by the building.
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30 """
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31 xpos, ypos = self.pos
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32 xsize, ysize = self.size
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33
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34 for dx in xrange(xsize):
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35 for dy in xrange(ysize):
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36 yield (xpos + dx, ypos + dy)
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37
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38 def loop(self, tv, _sprite):
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39 ppos = tv.tile_to_view(self.pos)
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40 self.rect.x = ppos[0]
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41 self.rect.y = ppos[1]
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42
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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 return self.pos
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47
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48 def place(self, tv):
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49 """Check that the building can be placed at its current position
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50 and place it if possible.
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51 """
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52 # check that all spaces under the structure are grassland
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53 for tile_pos in self.tile_positions():
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54 if not tv.get(tile_pos) == self.GRASSLAND:
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55 return False
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56
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57 # place tile
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58 for tile_pos in self.tile_positions():
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59 tv.set(tile_pos, self.tile_no)
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60
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61 return True
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62
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63 def covers(self, tile_pos):
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64 """Return True if build covers tile_pos, False otherwise."""
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65 xpos, ypos = self.pos
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66 xsize, ysize = self.size
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67 return (xpos <= tile_pos[0] < xpos + xsize) and \
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68 (ypos <= tile_pos[1] < ypos + ysize)
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69
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70 def remove(self, tv):
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71 """Remove the building from its current position."""
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72 # remove tile
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73 for tile_pos in self.tile_positions():
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74 tv.set(tile_pos, self.GRASSLAND)
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75
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76 def buy_price(self):
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77 return self._buy_price
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78
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79 def sell_price(self):
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80 return self._sell_price
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81
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82 def sun(self, sun_on):
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83 if sun_on:
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84 self.setimage(self.day_image)
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85 else:
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86 self.setimage(self.night_image)
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87
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88 def occupants(self):
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89 """Return list of buildings occupants."""
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90 return list(self._occupants)
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91
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92 def add_occupant(self, occupant):
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93 if occupant.abode is not None:
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94 occupant.abode.remove_occupant(occupant)
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95 occupant.abode = self
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96 self._occupants.add(occupant)
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97
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98 def remove_occupant(self, occupant):
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99 if occupant in self._occupants:
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100 self._occupants.remove(occupant)
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101 occupant.abode = None
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102
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103 class HenHouse(Building):
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104 """A HenHouse."""
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105
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106 TILE_NO = tiles.REVERSE_TILE_MAP['henhouse']
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107 BUY_PRICE = 100
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108 SELL_PRICE = 90
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109 SIZE = (3, 2)
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110 IMAGE = 'sprites/henhouse.png'
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111 NAME = 'Hen House'
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112
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113
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114 class GuardTower(Building):
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115 """A GuardTower."""
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116
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117 TILE_NO = tiles.REVERSE_TILE_MAP['guardtower']
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118 BUY_PRICE = 200
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119 SELL_PRICE = 150
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120 SIZE = (2, 2)
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121 IMAGE = 'sprites/watchtower.png'
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122 NAME = 'Watch Tower'
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123
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124 def is_building(obj):
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125 """Return true if obj is a build class."""
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126 return hasattr(obj, "NAME")
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127
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128 BUILDINGS = []
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129 for name in dir():
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130 obj = eval(name)
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131 try:
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132 if is_building(obj):
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133 BUILDINGS.append(obj)
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134 except TypeError:
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135 pass