Mercurial > mamba

annotate mamba/snake.py @ 198:2876658d0b98

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Don't allow the snake to reverse onto itself immediately.
author Simon Cross <hodgestar@gmail.com>
date Wed, 14 Sep 2011 19:29:15 +0200
parents d488731886dc
children 986e72d2cb4d
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rev   line source
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b1019923cb12 Direction control for snake.
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1 """The player snake object."""
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2
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3 from pygame.sprite import Group, spritecollide
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4
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5 from mamba.constants import TILE_SIZE
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6 from mamba.sprites import BaseSprite
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7 from mamba.engine import SnakeDiedEvent
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8 from mamba import mutators
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10
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11 class Snake(object):
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12
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13 UP, DOWN, LEFT, RIGHT = [(0, -1), (0, 1), (-1, 0), (1, 0)]
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14
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15 def __init__(self, tile_pos, orientation):
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16 self.segments = self.create_segments(tile_pos, orientation)
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17 self.segment_group = Group()
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18 self.segment_group.add(*reversed(self.segments))
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19 self.set_orientation(orientation)
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20 self.speed = 120.0 # pixel / s
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21 self.frac_ds = 0.0
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22 self.mutation = None
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23
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24 head = property(fget=lambda self: self.segments[0])
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25 tail = property(fget=lambda self: self.segments[-1])
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26
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27 def create_segments(self, tile_pos, orientation):
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28 tx, ty = tile_pos
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29 dx, dy = orientation
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30 segments = []
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31 for cls in [Head] + [Body] * 10 + [Tail]:
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32 segments.append(cls((tx, ty)))
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33 return segments
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34
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35 def draw(self, surface):
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36 self.segment_group.draw(surface)
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37
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38 def update(self, dt, world):
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39 ds = dt * self.speed + self.frac_ds
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40 ds, self.frac_ds = divmod(ds, 1)
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41 ds = int(ds)
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42 while True:
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43 tile_state = self.head.get_tile_state()
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44 shifted, ds = self.head.shift_head(ds)
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45 if not shifted:
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46 break
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47 self.head.set_orientation(self.orientation)
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48 for segment in self.segments[1:]:
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49 old_tile_state = segment.get_tile_state()
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50 segment.shift_tile(tile_state)
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51 tile_state = old_tile_state
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52
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53 for segment in self.segments:
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54 segment.shift_pixels(ds)
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55 world.interact(segment)
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56
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57 def set_orientation(self, orientation):
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58 if len(self.segments) > 1:
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59 neck_x, neck_y = self.segments[1].tile_pos
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60 head_x, head_y = self.head.tile_pos
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61 if (head_x + orientation[0] == neck_x and
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62 head_y + orientation[1] == neck_y):
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63 # Don't allow the snake to go back on itself
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64 # immediately. More creative self-inflicted
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65 # deaths are allowed though.
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66 return
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67 self.orientation = orientation
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68
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69 def crash(self):
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70 SnakeDiedEvent.post()
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71
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72 def mutate(self, mutation):
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73 self.mutation = mutation
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74
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75 def can_swim(self):
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76 return self.mutation == 'amphibious'
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79 class Segment(BaseSprite):
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80
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81 GREEN = mutators.SNAKE_GREEN
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82 BLUE = mutators.BLUE
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83 RED = mutators.RED
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84 YELLOW = mutators.YELLOW
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85
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86 _detail_mutators = ()
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87
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88 is_head = False
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89
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90 def __init__(self, image_name, tile_pos):
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91 super(Segment, self).__init__()
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92 self.set_base_image(image_name)
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93 self._colour_overlay = self.GREEN
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94 self.orientation = Snake.UP
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95
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96 self.make_images()
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97 self.update_image()
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98 self.set_tile_pos(tile_pos)
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99 self.on_tiles = []
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100
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101 def filter_collisions(self, group):
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102 collide = []
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103 tiles = spritecollide(self, group, False)
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104 for tile in tiles:
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105 if tile not in self.on_tiles:
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106 collide.append(tile)
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107 self.on_tiles = tiles
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108 return collide
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109
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110 def set_base_image(self, image_name):
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111 self._base_image = "/".join(["snake", image_name])
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112
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113 def make_images(self):
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114 self._images = {}
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115 for orientation, muts in [
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116 (Snake.RIGHT, (mutators.RIGHT,)),
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117 (Snake.LEFT, (mutators.LEFT,)),
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118 (Snake.UP, (mutators.UP,)),
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119 (Snake.DOWN, (mutators.DOWN,)),
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120 ]:
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121 all_muts = (self._colour_overlay,) + self._detail_mutators + muts
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122 self._images[orientation] = self.load_image(self._base_image,
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123 all_muts)
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124
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125 def update_image(self):
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126 self.image = self._images[self.orientation]
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127
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128 def set_orientation(self, orientation):
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129 self.orientation = orientation
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130 self.update_image()
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131
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132 def set_colour(self, colour_overlay):
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133 self._colour_overlay = colour_overlay
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134 self.make_images()
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135 self.update_image()
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136
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137 def get_tile_state(self):
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138 return self.tile_pos, self.orientation
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139
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140 def shift_tile(self, tile_state):
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141 """Shift this segment to the tile the other one was on.
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142
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143 Also reset the position to be the center of the tile.
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144 """
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145 tile_pos, orientation = tile_state
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146 self.set_tile_pos(tile_pos)
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147 self.orientation = orientation
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148
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149 def shift_pixels(self, distance):
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150 """Shift this segment a number of pixels."""
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151 dx, dy = self.orientation
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152 dx, dy = distance * dx, distance * dy
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153 self.rect = self.rect.move(dx, dy)
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154
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155
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156 class Head(Segment):
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157 CLOSED = "snake-head"
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158 OPEN = "snake-head-mouth-open-r"
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159 EYE = mutators.Overlay("tiles/common/snake/snake-head-eye-r.png")
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160 TONGUE = mutators.Overlay("tiles/common/snake/snake-head-tongue-r.png")
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161
182
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162 is_head = True
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163
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164 def __init__(self, tile_pos):
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165 self._detail_mutators = (self.EYE,)
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166 super(Head, self).__init__(self.CLOSED, tile_pos)
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167
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168 def mouth_open(self):
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169 self.set_base_image(self.OPEN)
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170 self.make_images()
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171 self.update_image()
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172
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173 def mouth_closed(self):
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174 self.set_base_image(self.CLOSED)
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175 self.make_images()
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176 self.update_image()
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177
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178 def tongue_out(self):
153
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179 self._detail_mutators = (self.EYE, self.TONGUE)
131
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180 self.make_images()
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181 self.update_image()
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182
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183 def tongue_in(self):
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184 self._detail_mutators = (self.EYE,)
131
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185 self.make_images()
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186 self.update_image()
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187
177
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188 def shift_head(self, ds):
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189 """Shift the head a number of pixels in the direction of it
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190 orientation.
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191 """
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192 dx, dy = self.orientation
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193 TX, TY = TILE_SIZE
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194 rx, ry = self.rect.left, self.rect.top
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195 tx, ty = self.tile_pos
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196 # WARNING: Tri-state logic ahead
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197 # (Tri-state logic is the mamba's natural habitat)
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198 if dx != 0:
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199 newdx = rx + ds * dx
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200 newtx = newdx / TX
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201 if newtx > tx:
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202 self.set_tile_pos((tx + 1, ty))
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203 ds = newdx - self.rect.left
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204 return True, ds
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205 elif newtx < tx - 1:
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206 self.set_tile_pos((tx - 1, ty))
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207 ds = self.rect.left - newdx
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208 return True, ds
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209 else:
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210 newdy = ry + ds * dy
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211 newty = newdy / TY
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212 if newty > ty:
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213 self.set_tile_pos((tx, ty + 1))
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214 ds = newdy - self.rect.top
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215 return True, ds
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216 elif newty < ty - 1:
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217 self.set_tile_pos((tx, ty - 1))
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218 ds = self.rect.top - newdy
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219 return True, ds
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220 return False, ds
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221
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222
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223 class Body(Segment):
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224 def __init__(self, tile_pos):
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225 super(Body, self).__init__("snake-body", tile_pos)
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226
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227
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228 class Tail(Segment):
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229 def __init__(self, tile_pos):
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230 super(Tail, self).__init__("snake-tail", tile_pos)