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annotate nagslang/enemies.py @ 308:3dee86b6c216

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Enemies leave corpses
author Stefano Rivera <stefano@rivera.za.net>
date Fri, 06 Sep 2013 00:36:14 +0200
parents c2bbb1e70d6f
children fa408430a174
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1 import math
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2
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3 import pymunk
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4 import pymunk.pygame_util
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5
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6 from nagslang import render
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7 from nagslang.constants import (COLLISION_TYPE_ENEMY, COLLISION_TYPE_BOX,
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8 ZORDER_MID)
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9 from nagslang.events import EnemyDeathEvent
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10 from nagslang.game_object import GameObject, SingleShapePhysicser, make_body
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11 from nagslang.mutators import FLIP_H
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12 from nagslang.resources import resources
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13
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14
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15 def get_editable_enemies():
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16 classes = []
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17 for cls_name, cls in globals().iteritems():
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18 if isinstance(cls, type) and issubclass(cls, Enemy):
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19 if hasattr(cls, 'requires'):
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20 classes.append((cls_name, cls))
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21 return classes
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22
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23
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24 class Enemy(GameObject):
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25 """A base class for mobile enemies"""
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26 enemy_type = None # Image to use for dead Enemy
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27
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28 def __init__(self, space, world, position):
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29 self._setup_physics(space, position)
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30 self._setup_renderer()
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31 self.health = 42
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32
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33 super(Enemy, self).__init__(
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34 self._physicser, self.renderer)
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35 self.zorder = ZORDER_MID
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36 self.world = world
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37
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38 def _get_image(self, name, *transforms):
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39 return resources.get_image('creatures', name, transforms=transforms)
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40
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41 def _setup_physics(self, space, position):
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42 raise NotImplementedError
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43
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44 def _setup_renderer(self):
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45 raise NotImplementedError
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46
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47 def attack(self):
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48 raise NotImplementedError
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49
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50 @classmethod
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51 def requires(cls):
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52 return [("name", "string"), ("position", "coordinates")]
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53
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54 def lose_health(self, amount):
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55 self.health -= amount
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56 if self.health < 0:
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57 self.physicser.remove_from_space()
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58 self.remove = True
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59 EnemyDeathEvent.post(self.physicser.position, 'A')
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60
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61
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62 class DeadEnemy(GameObject):
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63 def __init__(self, space, world, position, enemy_type='A'):
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64 body = make_body(10, 10000, position, damping=0.5)
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65 self.shape = pymunk.Poly(
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66 body, [(-20, -20), (20, -20), (20, 20), (-20, 20)])
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67 self.shape.friction = 0.5
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68 self.shape.collision_type = COLLISION_TYPE_BOX
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69 super(DeadEnemy, self).__init__(
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70 SingleShapePhysicser(space, self.shape),
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71 render.ImageRenderer(resources.get_image(
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72 'creatures', 'alien_%s_dead.png' % enemy_type)),
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73 )
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74
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75 @classmethod
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76 def requires(cls):
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77 return [("name", "string"), ("position", "coordinates")]
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78
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79
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80 class PatrollingAlien(Enemy):
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81 is_moving = True # Always walking.
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82 enemy_type = 'A'
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83
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84 def __init__(self, space, world, position, end_position):
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85 # An enemy that patrols between the two points
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86 super(PatrollingAlien, self).__init__(space, world, position)
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87 self._start_pos = position
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88 self._end_pos = end_position
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89 self._direction = 'away'
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90
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91 def _setup_physics(self, space, position):
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92 self._body = make_body(10, pymunk.inf, position, 0.8)
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93
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94 self._shape = pymunk.Circle(self._body, 30)
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95
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96 self._shape.elasticity = 1.0
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97 self._shape.friction = 0.05
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98 self._shape.collision_type = COLLISION_TYPE_ENEMY
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99 self._physicser = SingleShapePhysicser(space, self._shape)
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100 self.impulse_factor = 50
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101 self.angle = 0
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102
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103 def _setup_renderer(self):
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104 self.renderer = render.FacingSelectionRenderer({
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105 'left': render.TimedAnimatedRenderer(
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106 [self._get_image('alien_A_1.png'),
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107 self._get_image('alien_A_2.png')], 3),
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108 'right': render.TimedAnimatedRenderer(
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109 [self._get_image('alien_A_1.png', FLIP_H),
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110 self._get_image('alien_A_2.png', FLIP_H)], 3),
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111 })
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112
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113 def get_render_angle(self):
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114 # No image rotation when rendering, please.
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115 return 0
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116
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117 def get_facing_direction(self):
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118 # Enemies can face left or right.
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119 if - math.pi / 2 < self.angle <= math.pi / 2:
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120 return 'right'
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121 else:
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122 return 'left'
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123
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124 def _switch_direction(self):
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125 if self._direction == 'away':
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126 self._direction = 'towards'
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127 else:
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128 self._direction = 'away'
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129
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130 def set_direction(self, dx, dy):
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131 self.angle = pymunk.Vec2d((dx, dy)).angle
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132 self._body.apply_impulse(
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133 (dx * self.impulse_factor, dy * self.impulse_factor))
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134
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135 def update(self, seconds):
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136 # Calculate the step every frame
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137 if self._direction == 'away':
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138 target = self._end_pos
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139 else:
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140 target = self._start_pos
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141 x_step = 0
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142 y_step = 0
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143 if (target[0] < self._body.position[0]):
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144 x_step = max(-1, target[0] - self._body.position[0])
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145 elif (target[0] > self._body.position[0]):
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146 x_step = min(1, target[0] - self._body.position[0])
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147 if abs(x_step) < 0.5:
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148 x_step = 0
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149 if (target[1] < self._body.position[1]):
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150 y_step = max(-1, target[1] - self._body.position[1])
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151 elif (target[1] > self._body.position[1]):
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152 y_step = min(1, target[1] - self._body.position[1])
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153 if abs(y_step) < 0.5:
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154 y_step = 0
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155 if abs(x_step) < 1 and abs(y_step) < 1:
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156 self._switch_direction()
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157 self.set_direction(x_step, y_step)
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158 super(PatrollingAlien, self).update(seconds)
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159
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160 def collide_with_protagonist(self, protagonist):
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161 protagonist.lose_health(15)
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162
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163 def hit(self, weapon):
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164 self.lose_health(weapon.damage)
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165
235
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166 @classmethod
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167 def requires(cls):
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168 return [("name", "string"), ("position", "coordinates"),
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169 ("end_position", "coordinates")]
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170
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171
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172 class ChargingAlien(Enemy):
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173 # Simplistic charging of the protagonist
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174 is_moving = False
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175 enemy_type = 'B'
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176
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177 def __init__(self, space, world, position, attack_range=100):
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178 super(ChargingAlien, self).__init__(space, world, position)
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179 self._range = attack_range
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180
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181 def _setup_physics(self, space, position):
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182 self._body = make_body(100, pymunk.inf, position, 0.8)
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183
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184 self._shape = pymunk.Circle(self._body, 30)
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185
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186 self._shape.elasticity = 1.0
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187 self._shape.friction = 0.05
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188 self._shape.collision_type = COLLISION_TYPE_ENEMY
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189 self._physicser = SingleShapePhysicser(space, self._shape)
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190 self.impulse_factor = 300
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191 self.angle = 0
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192
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193 def _setup_renderer(self):
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194 self.renderer = render.FacingSelectionRenderer({
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195 'left': render.TimedAnimatedRenderer(
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196 [self._get_image('alien_B_1.png'),
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197 self._get_image('alien_B_2.png')], 3),
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198 'right': render.TimedAnimatedRenderer(
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199 [self._get_image('alien_B_1.png', FLIP_H),
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200 self._get_image('alien_B_2.png', FLIP_H)], 3),
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201 })
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202
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203 def get_render_angle(self):
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204 # No image rotation when rendering, please.
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205 return 0
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206
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207 def get_facing_direction(self):
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208 # Enemies can face left or right.
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209 if - math.pi / 2 < self.angle <= math.pi / 2:
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210 return 'right'
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211 else:
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212 return 'left'
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213
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214 def set_direction(self, dx, dy):
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215 self.angle = pymunk.Vec2d((dx, dy)).angle
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216 self._body.apply_impulse(
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217 (dx * self.impulse_factor, dy * self.impulse_factor))
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218
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219 def update(self, seconds):
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220 # Calculate the step every frame
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221 # Distance to the protagonist
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222 pos = self._body.position
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223 target = self.world.protagonist.get_shape().body.position
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224 if pos.get_distance(target) > self._range:
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225 # stop
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226 self.is_moving = False
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227 return
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228 self.is_moving = True
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229 x_step = 0
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230 y_step = 0
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231 if (target[0] < pos[0]):
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232 x_step = max(-1, target[0] - pos[0])
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233 elif (target[0] > pos[0]):
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234 x_step = min(1, target[0] - pos[0])
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235 if abs(x_step) < 0.5:
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236 x_step = 0
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237 if (target[1] < pos[1]):
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238 y_step = max(-1, target[1] - pos[1])
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239 elif (target[1] > pos[1]):
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240 y_step = min(1, target[1] - pos[1])
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241 if abs(y_step) < 0.5:
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242 y_step = 0
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243 self.set_direction(x_step, y_step)
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244 super(ChargingAlien, self).update(seconds)
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245
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246 def collide_with_protagonist(self, protagonist):
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247 protagonist.lose_health(20)
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248
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249 @classmethod
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250 def requires(cls):
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251 return [("name", "string"), ("position", "coordinates"),
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252 ("attack_range", "distance")]