Mercurial > mamba
annotate mamba/snake.py @ 188:d76c069164c0
Much better interaction detection.
author | Jeremy Thurgood <firxen@gmail.com> |
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date | Wed, 14 Sep 2011 17:41:26 +0200 |
parents | 3449b51ae944 |
children | d488731886dc |
rev | line source |
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78 | 1 """The player snake object.""" |
2 | |
188
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3 from pygame.sprite import Group, spritecollide |
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4 from pygame.locals import BLEND_MULT |
110 | 5 |
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6 from mamba.constants import TILE_SIZE |
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7 from mamba.sprites import BaseSprite |
186 | 8 from mamba.engine import SnakeDiedEvent |
98 | 9 from mamba import mutators |
78 | 10 |
11 | |
110 | 12 class Snake(object): |
78 | 13 |
110 | 14 UP, DOWN, LEFT, RIGHT = [(0, -1), (0, 1), (-1, 0), (1, 0)] |
78 | 15 |
16 def __init__(self, tile_pos, orientation): | |
110 | 17 self.segments = self.create_segments(tile_pos, orientation) |
18 self.segment_group = Group() | |
178 | 19 self.segment_group.add(*reversed(self.segments)) |
78 | 20 self.set_orientation(orientation) |
178 | 21 self.speed = 120.0 # pixel / s |
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22 self.frac_ds = 0.0 |
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23 self.mutation = None |
78 | 24 |
110 | 25 head = property(fget=lambda self: self.segments[0]) |
26 tail = property(fget=lambda self: self.segments[-1]) | |
27 | |
28 def create_segments(self, tile_pos, orientation): | |
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29 tx, ty = tile_pos |
110 | 30 dx, dy = orientation |
178 | 31 segments = [] |
32 for cls in [Head] + [Body] * 10 + [Tail]: | |
33 segments.append(cls((tx, ty))) | |
34 return segments | |
110 | 35 |
36 def draw(self, surface): | |
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37 self.segment_group.draw(surface) |
98 | 38 |
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39 def update(self, dt, world): |
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40 ds = dt * self.speed + self.frac_ds |
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41 ds, self.frac_ds = divmod(ds, 1) |
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42 ds = int(ds) |
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43 while True: |
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44 tile_state = self.head.get_tile_state() |
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45 shifted, ds = self.head.shift_head(ds) |
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46 if not shifted: |
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47 break |
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48 self.head.set_orientation(self.orientation) |
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49 for segment in self.segments[1:]: |
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50 old_tile_state = segment.get_tile_state() |
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51 segment.shift_tile(tile_state) |
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52 tile_state = old_tile_state |
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53 |
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54 for segment in self.segments: |
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55 segment.shift_pixels(ds) |
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56 world.interact(segment) |
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57 |
78 | 58 def set_orientation(self, orientation): |
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59 self.orientation = orientation |
98 | 60 |
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61 def crash(self): |
186 | 62 SnakeDiedEvent.post() |
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63 |
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64 def mutate(self, mutation): |
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65 self.mutation = mutation |
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66 |
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67 def can_swim(self): |
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68 return self.mutation == 'amphibious' |
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69 |
98 | 70 |
110 | 71 class Segment(BaseSprite): |
72 | |
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73 GREEN = mutators.Overlay("tiles/common/snake/green.png", BLEND_MULT) |
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74 BLUE = mutators.BLUE |
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75 RED = mutators.RED |
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76 YELLOW = mutators.YELLOW |
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77 |
131 | 78 _detail_mutators = () |
79 | |
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80 is_head = False |
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81 |
110 | 82 def __init__(self, image_name, tile_pos): |
83 super(Segment, self).__init__() | |
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84 self.set_base_image(image_name) |
131 | 85 self._colour_overlay = self.GREEN |
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86 self.orientation = Snake.UP |
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87 |
131 | 88 self.make_images() |
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89 self.update_image() |
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90 self.set_tile_pos(tile_pos) |
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91 self.on_tiles = [] |
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92 |
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93 def filter_collisions(self, group): |
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94 collide = [] |
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95 tiles = spritecollide(self, group, False) |
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96 for tile in tiles: |
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97 if tile not in self.on_tiles: |
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98 collide.append(tile) |
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99 self.on_tiles = tiles |
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100 return collide |
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101 |
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102 def set_base_image(self, image_name): |
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103 self._base_image = "/".join(["snake", image_name]) |
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104 |
131 | 105 def make_images(self): |
110 | 106 self._images = {} |
107 for orientation, muts in [ | |
108 (Snake.RIGHT, (mutators.RIGHT,)), | |
109 (Snake.LEFT, (mutators.LEFT,)), | |
110 (Snake.UP, (mutators.UP,)), | |
111 (Snake.DOWN, (mutators.DOWN,)), | |
112 ]: | |
131 | 113 all_muts = (self._colour_overlay,) + self._detail_mutators + muts |
141 | 114 self._images[orientation] = self.load_image(self._base_image, |
115 all_muts) | |
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116 |
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117 def update_image(self): |
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118 self.image = self._images[self.orientation] |
110 | 119 |
120 def set_orientation(self, orientation): | |
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121 self.orientation = orientation |
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122 self.update_image() |
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123 |
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124 def set_colour(self, colour_overlay): |
131 | 125 self._colour_overlay = colour_overlay |
126 self.make_images() | |
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127 self.update_image() |
110 | 128 |
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129 def get_tile_state(self): |
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130 return self.tile_pos, self.orientation |
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131 |
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132 def shift_tile(self, tile_state): |
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133 """Shift this segment to the tile the other one was on. |
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134 |
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135 Also reset the position to be the center of the tile. |
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136 """ |
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137 tile_pos, orientation = tile_state |
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138 self.set_tile_pos(tile_pos) |
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139 self.orientation = orientation |
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140 |
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141 def shift_pixels(self, distance): |
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142 """Shift this segment a number of pixels.""" |
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143 dx, dy = self.orientation |
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144 dx, dy = distance * dx, distance * dy |
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145 self.rect = self.rect.move(dx, dy) |
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146 |
110 | 147 |
148 class Head(Segment): | |
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149 CLOSED = "snake-head" |
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150 OPEN = "snake-head-mouth-open-r" |
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151 EYE = mutators.Overlay("tiles/common/snake/snake-head-eye-r.png") |
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152 TONGUE = mutators.Overlay("tiles/common/snake/snake-head-tongue-r.png") |
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153 |
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154 is_head = True |
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155 |
110 | 156 def __init__(self, tile_pos): |
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157 self._detail_mutators = (self.EYE,) |
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158 super(Head, self).__init__(self.CLOSED, tile_pos) |
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159 |
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160 def mouth_open(self): |
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161 self.set_base_image(self.OPEN) |
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162 self.make_images() |
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163 self.update_image() |
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164 |
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165 def mouth_closed(self): |
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166 self.set_base_image(self.CLOSED) |
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167 self.make_images() |
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168 self.update_image() |
110 | 169 |
131 | 170 def tongue_out(self): |
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171 self._detail_mutators = (self.EYE, self.TONGUE) |
131 | 172 self.make_images() |
173 self.update_image() | |
174 | |
175 def tongue_in(self): | |
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176 self._detail_mutators = (self.EYE,) |
131 | 177 self.make_images() |
178 self.update_image() | |
179 | |
177
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180 def shift_head(self, ds): |
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181 """Shift the head a number of pixels in the direction of it |
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182 orientation. |
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183 """ |
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184 dx, dy = self.orientation |
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185 TX, TY = TILE_SIZE |
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186 rx, ry = self.rect.left, self.rect.top |
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187 tx, ty = self.tile_pos |
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188 # WARNING: Tri-state logic ahead |
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189 # (Tri-state logic is the mamba's natural habitat) |
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190 if dx != 0: |
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191 newdx = rx + ds * dx |
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192 newtx = newdx / TX |
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193 if newtx > tx: |
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194 self.set_tile_pos((tx + 1, ty)) |
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195 ds = newdx - self.rect.left |
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196 return True, ds |
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197 elif newtx < tx - 1: |
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198 self.set_tile_pos((tx - 1, ty)) |
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199 ds = self.rect.left - newdx |
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200 return True, ds |
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201 else: |
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202 newdy = ry + ds * dy |
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203 newty = newdy / TY |
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204 if newty > ty: |
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205 self.set_tile_pos((tx, ty + 1)) |
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206 ds = newdy - self.rect.top |
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207 return True, ds |
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208 elif newty < ty - 1: |
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209 self.set_tile_pos((tx, ty - 1)) |
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210 ds = self.rect.top - newdy |
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211 return True, ds |
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212 return False, ds |
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213 |
110 | 214 |
215 class Body(Segment): | |
216 def __init__(self, tile_pos): | |
153
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217 super(Body, self).__init__("snake-body", tile_pos) |
110 | 218 |
219 | |
220 class Tail(Segment): | |
221 def __init__(self, tile_pos): | |
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222 super(Tail, self).__init__("snake-tail", tile_pos) |