Mercurial > nagslang

annotate nagslang/enemies.py @ 333:3dd32686dbc3

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Better wolf claw attack.
author Jeremy Thurgood <firxen@gmail.com>
date Fri, 06 Sep 2013 10:49:19 +0200
parents 26d1978fa1da
children a3f1b2f0e3fb
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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_FURNITURE,
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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 enemy_damage = None
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28
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29 def __init__(self, space, world, position):
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30 self._setup_physics(space, position)
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31 self._setup_renderer()
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32 self.health = 42
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33
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34 super(Enemy, self).__init__(
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35 self._physicser, self.renderer)
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36 self.zorder = ZORDER_MID
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37 self.world = world
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38
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39 def _get_image(self, name, *transforms):
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40 return resources.get_image('creatures', name, transforms=transforms)
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41
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42 def _setup_physics(self, space, position):
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43 raise NotImplementedError
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44
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45 def _setup_renderer(self):
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46 raise NotImplementedError
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47
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48 def attack(self):
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49 raise NotImplementedError
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50
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51 @classmethod
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52 def requires(cls):
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53 return [("name", "string"), ("position", "coordinates")]
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54
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55 def hit(self, weapon):
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56 self.lose_health(weapon.damage)
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57
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58 def lose_health(self, amount):
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59 self.health -= amount
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60 if self.health < 0:
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61 self.physicser.remove_from_space()
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62 self.remove = True
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63 EnemyDeathEvent.post(self.physicser.position, self.enemy_type)
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64
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65 def collide_with_protagonist(self, protagonist):
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66 if self.enemy_damage is not None:
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67 protagonist.lose_health(self.enemy_damage)
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68
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69 def collide_with_claw_attack(self, claw_attack):
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70 self.lose_health(claw_attack.damage)
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71
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72
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73 class DeadEnemy(GameObject):
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74 def __init__(self, space, world, position, enemy_type='A'):
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75 body = make_body(10, 10000, position, damping=0.5)
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76 self.shape = pymunk.Poly(
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77 body, [(-20, -20), (20, -20), (20, 20), (-20, 20)])
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78 self.shape.friction = 0.5
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79 self.shape.collision_type = COLLISION_TYPE_FURNITURE
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80 super(DeadEnemy, self).__init__(
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81 SingleShapePhysicser(space, self.shape),
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82 render.ImageRenderer(resources.get_image(
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83 'creatures', 'alien_%s_dead.png' % enemy_type)),
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84 )
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85
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86 @classmethod
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87 def requires(cls):
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88 return [("name", "string"), ("position", "coordinates")]
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89
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90
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91 class PatrollingAlien(Enemy):
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92 is_moving = True # Always walking.
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93 enemy_type = 'A'
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94
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95 def __init__(self, space, world, position, end_position):
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96 # An enemy that patrols between the two points
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97 super(PatrollingAlien, self).__init__(space, world, position)
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98 self._start_pos = position
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99 self._end_pos = end_position
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100 self._direction = 'away'
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101
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102 def _setup_physics(self, space, position):
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103 self._body = make_body(10, pymunk.inf, position, 0.8)
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104
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105 self._shape = pymunk.Circle(self._body, 30)
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106
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107 self._shape.elasticity = 1.0
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108 self._shape.friction = 0.05
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109 self._shape.collision_type = COLLISION_TYPE_ENEMY
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110 self._physicser = SingleShapePhysicser(space, self._shape)
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111 self.impulse_factor = 50
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112 self.angle = 0
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113
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114 def _setup_renderer(self):
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115 self.renderer = render.FacingSelectionRenderer({
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116 'left': render.TimedAnimatedRenderer(
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117 [self._get_image('alien_A_1.png'),
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118 self._get_image('alien_A_2.png')], 3),
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119 'right': render.TimedAnimatedRenderer(
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120 [self._get_image('alien_A_1.png', FLIP_H),
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121 self._get_image('alien_A_2.png', FLIP_H)], 3),
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122 })
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123
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124 def get_render_angle(self):
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125 # No image rotation when rendering, please.
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126 return 0
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127
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128 def get_facing_direction(self):
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129 # Enemies can face left or right.
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130 if - math.pi / 2 < self.angle <= math.pi / 2:
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131 return 'right'
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132 else:
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133 return 'left'
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134
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135 def _switch_direction(self):
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136 if self._direction == 'away':
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137 self._direction = 'towards'
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138 else:
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139 self._direction = 'away'
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140
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141 def set_direction(self, dx, dy):
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142 self.angle = pymunk.Vec2d((dx, dy)).angle
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143 self._body.apply_impulse(
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144 (dx * self.impulse_factor, dy * self.impulse_factor))
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145
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146 def update(self, dt):
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147 # Calculate the step every frame
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148 if self._direction == 'away':
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149 target = self._end_pos
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150 else:
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151 target = self._start_pos
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152 x_step = 0
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153 y_step = 0
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154 if (target[0] < self._body.position[0]):
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155 x_step = max(-1, target[0] - self._body.position[0])
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156 elif (target[0] > self._body.position[0]):
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157 x_step = min(1, target[0] - self._body.position[0])
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158 if abs(x_step) < 0.5:
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159 x_step = 0
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160 if (target[1] < self._body.position[1]):
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161 y_step = max(-1, target[1] - self._body.position[1])
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162 elif (target[1] > self._body.position[1]):
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163 y_step = min(1, target[1] - self._body.position[1])
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164 if abs(y_step) < 0.5:
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165 y_step = 0
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166 if abs(x_step) < 1 and abs(y_step) < 1:
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167 self._switch_direction()
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168 self.set_direction(x_step, y_step)
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169 super(PatrollingAlien, self).update(dt)
258
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170
235
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171 @classmethod
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172 def requires(cls):
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173 return [("name", "string"), ("position", "coordinates"),
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174 ("end_position", "coordinates")]
278
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175
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176
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177 class ChargingAlien(Enemy):
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178 # Simplistic charging of the protagonist
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179 is_moving = False
308
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180 enemy_type = 'B'
278
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181
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182 def __init__(self, space, world, position, attack_range=100):
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183 super(ChargingAlien, self).__init__(space, world, position)
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184 self._range = attack_range
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185
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186 def _setup_physics(self, space, position):
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187 self._body = make_body(100, pymunk.inf, position, 0.8)
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188
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189 self._shape = pymunk.Circle(self._body, 30)
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190
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191 self._shape.elasticity = 1.0
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192 self._shape.friction = 0.05
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193 self._shape.collision_type = COLLISION_TYPE_ENEMY
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194 self._physicser = SingleShapePhysicser(space, self._shape)
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195 self.impulse_factor = 300
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196 self.angle = 0
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197
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198 def _setup_renderer(self):
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199 self.renderer = render.FacingSelectionRenderer({
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200 'left': render.TimedAnimatedRenderer(
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201 [self._get_image('alien_B_1.png'),
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202 self._get_image('alien_B_2.png')], 3),
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203 'right': render.TimedAnimatedRenderer(
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204 [self._get_image('alien_B_1.png', FLIP_H),
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205 self._get_image('alien_B_2.png', FLIP_H)], 3),
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206 })
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207
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208 def get_render_angle(self):
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209 # No image rotation when rendering, please.
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210 return 0
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211
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212 def get_facing_direction(self):
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213 # Enemies can face left or right.
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214 if - math.pi / 2 < self.angle <= math.pi / 2:
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215 return 'right'
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216 else:
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217 return 'left'
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218
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219 def set_direction(self, dx, dy):
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220 self.angle = pymunk.Vec2d((dx, dy)).angle
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221 self._body.apply_impulse(
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222 (dx * self.impulse_factor, dy * self.impulse_factor))
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223
333
3dd32686dbc3 Better wolf claw attack.
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224 def update(self, dt):
278
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225 # Calculate the step every frame
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226 # Distance to the protagonist
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227 pos = self._body.position
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228 target = self.world.protagonist.get_shape().body.position
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229 if pos.get_distance(target) > self._range:
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230 # stop
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231 self.is_moving = False
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232 return
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233 self.is_moving = True
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234 x_step = 0
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235 y_step = 0
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diff changeset
236 if (target[0] < pos[0]):
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237 x_step = max(-1, target[0] - pos[0])
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diff changeset
238 elif (target[0] > pos[0]):
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239 x_step = min(1, target[0] - pos[0])
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240 if abs(x_step) < 0.5:
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241 x_step = 0
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diff changeset
242 if (target[1] < pos[1]):
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243 y_step = max(-1, target[1] - pos[1])
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diff changeset
244 elif (target[1] > pos[1]):
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245 y_step = min(1, target[1] - pos[1])
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diff changeset
246 if abs(y_step) < 0.5:
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247 y_step = 0
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diff changeset
248 self.set_direction(x_step, y_step)
333
3dd32686dbc3 Better wolf claw attack.
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diff changeset
249 super(ChargingAlien, self).update(dt)
278
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diff changeset
250
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diff changeset
251 @classmethod
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252 def requires(cls):
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253 return [("name", "string"), ("position", "coordinates"),
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254 ("attack_range", "distance")]