Mercurial > mamba

annotate mamba/snake.py @ 201:78f9cafb0819

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Fix uturns. Start of work on adding and removing segments.
author Simon Cross <hodgestar@gmail.com>
date Wed, 14 Sep 2011 20:14:41 +0200
parents 986e72d2cb4d
children 498c1d659a94
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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, UP, DOWN, LEFT, RIGHT
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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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9
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10
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11 class Snake(object):
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12
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13 def __init__(self, tile_pos, orientation):
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14 self.segments = self.create_segments(tile_pos, orientation)
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15 self.pending_segments = [] # segments waiting to be added
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16 self.segment_group = Group()
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17 self.segment_group.add(*reversed(self.segments))
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18 self.set_orientation(orientation)
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19 self.speed = 120.0 # pixel / s
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20 self.frac_ds = 0.0
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21 self.mutation = None
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22
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23 head = property(fget=lambda self: self.segments[0])
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24 tail = property(fget=lambda self: self.segments[-1])
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25
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26 def create_segments(self, tile_pos, orientation):
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27 tx, ty = tile_pos
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28 dx, dy = orientation
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29 segments = []
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30 for cls in [Head] + [Body] * 10 + [Tail]:
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31 segments.append(cls((tx, ty)))
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32 return segments
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33
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34 def add_segment(self, segment=None):
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35 if segment is None:
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36 segment = Body((0, 0))
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37 self.pending_segments.append(segment)
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38
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39 def remove_segment(self, segment=None):
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40 if segment is None:
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41 if len(self.segments) < 3:
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42 return
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43 segment = self.segments[-2]
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44 try:
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45 idx = self.segments.index(segment)
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46 except IndexError:
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47 return
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48 self.shiftup_segments(idx, segment.get_tile_state())
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49 del self.segments[idx]
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50
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51 def shiftup_segments(self, idx, state):
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52 for segment in self.segments[idx:]:
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53 next_state = segment.get_tile_state()
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54 segment.shift_tile(state)
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55 state = next_state
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56
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57 def draw(self, surface):
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58 self.segment_group.draw(surface)
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59
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60 def update(self, dt, world):
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61 ds = dt * self.speed + self.frac_ds
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62 ds, self.frac_ds = divmod(ds, 1)
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63 ds = int(ds)
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64 while True:
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65 tile_state = self.head.get_tile_state()
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66 shifted, ds = self.head.shift_head(ds)
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67 if not shifted:
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68 break
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69 self.shiftup_segments(1, tile_state)
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70 if not self.check_uturn():
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71 self.head.set_orientation(self.orientation)
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72
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73 for segment in self.segments:
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74 segment.shift_pixels(ds)
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75 world.interact(segment)
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77 def check_uturn(self):
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78 if len(self.segments) > 1:
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79 neck_x, neck_y = self.segments[1].tile_pos
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80 head_x, head_y = self.head.tile_pos
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81 if (head_x + self.orientation[0] == neck_x and
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82 head_y + self.orientation[1] == neck_y):
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83 # Don't allow the snake to go back on itself
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84 # immediately. More creative self-inflicted
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85 # deaths are allowed though.
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86 return True
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87 return False
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88
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89 def set_orientation(self, orientation):
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90 self.orientation = orientation
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91
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92 def crash(self):
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93 SnakeDiedEvent.post()
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94
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95 def mutate(self, mutation):
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96 self.mutation = mutation
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97
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98 def can_swim(self):
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99 return self.mutation == 'amphibious'
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100
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101
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102 class Segment(BaseSprite):
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103
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104 GREEN = mutators.SNAKE_GREEN
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105 BLUE = mutators.BLUE
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106 RED = mutators.RED
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107 YELLOW = mutators.YELLOW
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108
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109 _detail_mutators = ()
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110
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111 is_head = False
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112
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113 def __init__(self, image_name, tile_pos):
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114 super(Segment, self).__init__()
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115 self.set_base_image(image_name)
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116 self._colour_overlay = self.GREEN
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117 self.orientation = UP
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118
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119 self.make_images()
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120 self.update_image()
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121 self.set_tile_pos(tile_pos)
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122 self.on_tiles = []
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123
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124 def filter_collisions(self, group):
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125 collide = []
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126 tiles = spritecollide(self, group, False)
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127 for tile in tiles:
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128 if tile not in self.on_tiles:
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129 collide.append(tile)
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130 self.on_tiles = tiles
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131 return collide
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132
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133 def set_base_image(self, image_name):
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134 self._base_image = "/".join(["snake", image_name])
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135
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136 def make_images(self):
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137 self._images = {}
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138 for orientation, muts in [
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139 (RIGHT, (mutators.RIGHT,)),
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140 (LEFT, (mutators.LEFT,)),
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141 (UP, (mutators.UP,)),
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142 (DOWN, (mutators.DOWN,)),
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143 ]:
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144 all_muts = (self._colour_overlay,) + self._detail_mutators + muts
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145 self._images[orientation] = self.load_image(self._base_image,
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146 all_muts)
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148 def update_image(self):
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149 self.image = self._images[self.orientation]
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150
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151 def set_orientation(self, orientation):
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152 self.orientation = orientation
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153 self.update_image()
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154
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155 def set_colour(self, colour_overlay):
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156 self._colour_overlay = colour_overlay
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157 self.make_images()
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158 self.update_image()
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159
177
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160 def get_tile_state(self):
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161 return self.tile_pos, self.orientation
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162
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163 def shift_tile(self, tile_state):
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164 """Shift this segment to the tile the other one was on.
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165
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166 Also reset the position to be the center of the tile.
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167 """
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168 tile_pos, orientation = tile_state
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169 self.set_tile_pos(tile_pos)
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170 self.orientation = orientation
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171
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172 def shift_pixels(self, distance):
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173 """Shift this segment a number of pixels."""
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174 dx, dy = self.orientation
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175 dx, dy = distance * dx, distance * dy
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176 self.rect = self.rect.move(dx, dy)
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177
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178
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179 class Head(Segment):
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180 CLOSED = "snake-head"
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181 OPEN = "snake-head-mouth-open-r"
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182 EYE = mutators.Overlay("tiles/common/snake/snake-head-eye-r.png")
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183 TONGUE = mutators.Overlay("tiles/common/snake/snake-head-tongue-r.png")
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184
182
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185 is_head = True
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186
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187 def __init__(self, tile_pos):
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188 self._detail_mutators = (self.EYE,)
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189 super(Head, self).__init__(self.CLOSED, tile_pos)
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190
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191 def mouth_open(self):
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192 self.set_base_image(self.OPEN)
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193 self.make_images()
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194 self.update_image()
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195
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196 def mouth_closed(self):
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197 self.set_base_image(self.CLOSED)
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198 self.make_images()
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199 self.update_image()
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200
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201 def tongue_out(self):
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202 self._detail_mutators = (self.EYE, self.TONGUE)
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203 self.make_images()
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204 self.update_image()
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205
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206 def tongue_in(self):
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207 self._detail_mutators = (self.EYE,)
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208 self.make_images()
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209 self.update_image()
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210
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211 def shift_head(self, ds):
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212 """Shift the head a number of pixels in the direction of it
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213 orientation.
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214 """
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215 dx, dy = self.orientation
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216 TX, TY = TILE_SIZE
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217 rx, ry = self.rect.left, self.rect.top
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218 tx, ty = self.tile_pos
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219 # WARNING: Tri-state logic ahead
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220 # (Tri-state logic is the mamba's natural habitat)
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221 if dx != 0:
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222 newdx = rx + ds * dx
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223 newtx = newdx / TX
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224 if newtx > tx:
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225 self.set_tile_pos((tx + 1, ty))
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226 ds = newdx - self.rect.left
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227 return True, ds
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228 elif newtx < tx - 1:
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229 self.set_tile_pos((tx - 1, ty))
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230 ds = self.rect.left - newdx
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231 return True, ds
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232 else:
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233 newdy = ry + ds * dy
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234 newty = newdy / TY
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235 if newty > ty:
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236 self.set_tile_pos((tx, ty + 1))
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237 ds = newdy - self.rect.top
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238 return True, ds
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239 elif newty < ty - 1:
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240 self.set_tile_pos((tx, ty - 1))
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241 ds = self.rect.top - newdy
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242 return True, ds
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243 return False, ds
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244
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245
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246 class Body(Segment):
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247 def __init__(self, tile_pos):
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248 super(Body, self).__init__("snake-body", tile_pos)
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249
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250
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251 class Tail(Segment):
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252 def __init__(self, tile_pos):
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253 super(Tail, self).__init__("snake-tail", tile_pos)