Mercurial > nagslang

annotate nagslang/enemies.py @ 361:534eac55a178

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ChargingEnemy spits acid
author Stefano Rivera <stefano@rivera.za.net>
date Fri, 06 Sep 2013 20:10:46 +0200
parents 911547a1c378
children 3dd08e18580f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 ACID_SPEED, ACID_DAMAGE, ZORDER_MID)
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9 from nagslang.events import EnemyDeathEvent, FireEvent
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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 from nagslang.utils import vec_with_length
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14
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15
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16 def get_editable_enemies():
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17 classes = []
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18 for cls_name, cls in globals().iteritems():
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19 if isinstance(cls, type) and issubclass(cls, Enemy):
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20 if hasattr(cls, 'requires'):
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21 classes.append((cls_name, cls))
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22 return classes
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23
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24
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25 def get_alien_image(enemy_type, suffix, *transforms):
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26 image_name = 'alien_%s_%s.png' % (enemy_type, suffix)
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27 return resources.get_image('creatures', image_name, transforms=transforms)
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28
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29
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30 class Enemy(GameObject):
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31 """A base class for mobile enemies"""
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32 zorder = ZORDER_MID
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33 enemy_type = None # Which set of images to use
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34 enemy_damage = None
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35 health = None
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36 impulse_factor = None
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37
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38 def __init__(self, space, world, position):
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39 super(Enemy, self).__init__(
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40 self.make_physics(space, position), self.make_renderer())
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41 self.world = world
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42 self.angle = 0
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43
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44 def make_physics(self, space, position):
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45 raise NotImplementedError
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46
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47 def make_renderer(self):
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48 return render.FacingSelectionRenderer({
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49 'left': render.TimedAnimatedRenderer(
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50 [get_alien_image(self.enemy_type, '1'),
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51 get_alien_image(self.enemy_type, '2')], 3),
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52 'right': render.TimedAnimatedRenderer(
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53 [get_alien_image(self.enemy_type, '1', FLIP_H),
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54 get_alien_image(self.enemy_type, '2', FLIP_H)], 3),
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55 })
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56
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57 def attack(self):
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58 raise NotImplementedError
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59
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60 @classmethod
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61 def requires(cls):
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62 return [("name", "string"), ("position", "coordinates")]
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63
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64 def hit(self, weapon):
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65 self.lose_health(weapon.damage)
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66
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67 def lose_health(self, amount):
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68 self.health -= amount
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69 if self.health < 0:
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70 self.physicser.remove_from_space()
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71 self.remove = True
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72 EnemyDeathEvent.post(self.physicser.position, self.enemy_type)
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73
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74 def set_direction(self, dx, dy):
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75 vec = vec_with_length((dx, dy), self.impulse_factor)
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76 self.angle = vec.angle
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77 self.physicser.apply_impulse(vec)
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78
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79 def collide_with_protagonist(self, protagonist):
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80 if self.enemy_damage is not None:
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81 protagonist.lose_health(self.enemy_damage)
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82
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83 def collide_with_claw_attack(self, claw_attack):
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84 self.lose_health(claw_attack.damage)
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85
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86
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87 class DeadEnemy(GameObject):
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88 def __init__(self, space, world, position, enemy_type='A'):
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89 body = make_body(10, 10000, position, damping=0.5)
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90 self.shape = pymunk.Poly(
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91 body, [(-20, -20), (20, -20), (20, 20), (-20, 20)])
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92 self.shape.friction = 0.5
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93 self.shape.collision_type = COLLISION_TYPE_FURNITURE
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94 super(DeadEnemy, self).__init__(
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95 SingleShapePhysicser(space, self.shape),
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96 render.ImageRenderer(resources.get_image(
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97 'creatures', 'alien_%s_dead.png' % enemy_type)),
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98 )
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99
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100 @classmethod
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101 def requires(cls):
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102 return [("name", "string"), ("position", "coordinates")]
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103
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104
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105 class PatrollingAlien(Enemy):
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106 is_moving = True # Always walking.
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107 enemy_type = 'A'
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108 health = 42
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109 enemy_damage = 15
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110 impulse_factor = 50
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111
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112 def __init__(self, space, world, position, end_position):
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113 # An enemy that patrols between the two points
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114 super(PatrollingAlien, self).__init__(space, world, position)
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115 self._start_pos = position
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116 self._end_pos = end_position
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117 self._direction = 'away'
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118
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119 def make_physics(self, space, position):
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120 body = make_body(10, pymunk.inf, position, 0.8)
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121 shape = pymunk.Circle(body, 30)
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122 shape.elasticity = 1.0
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123 shape.friction = 0.05
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124 shape.collision_type = COLLISION_TYPE_ENEMY
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125 return SingleShapePhysicser(space, shape)
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126
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127 def get_render_angle(self):
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128 # No image rotation when rendering, please.
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129 return 0
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130
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131 def get_facing_direction(self):
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132 # Enemies can face left or right.
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133 if - math.pi / 2 < self.angle <= math.pi / 2:
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134 return 'right'
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135 else:
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136 return 'left'
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137
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138 def _switch_direction(self):
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139 if self._direction == 'away':
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140 self._direction = 'towards'
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141 else:
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142 self._direction = 'away'
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143
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144 def update(self, dt):
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145 # Calculate the step every frame
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146 if self._direction == 'away':
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147 target = self._end_pos
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148 else:
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149 target = self._start_pos
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150 x_step = 0
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151 y_step = 0
334
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152 if (target[0] < self.physicser.position[0]):
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153 x_step = max(-1, target[0] - self.physicser.position[0])
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154 elif (target[0] > self.physicser.position[0]):
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155 x_step = min(1, target[0] - self.physicser.position[0])
168
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156 if abs(x_step) < 0.5:
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157 x_step = 0
334
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158 if (target[1] < self.physicser.position[1]):
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159 y_step = max(-1, target[1] - self.physicser.position[1])
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160 elif (target[1] > self.physicser.position[1]):
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161 y_step = min(1, target[1] - self.physicser.position[1])
168
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162 if abs(y_step) < 0.5:
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163 y_step = 0
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164 if abs(x_step) < 1 and abs(y_step) < 1:
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165 self._switch_direction()
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166 self.set_direction(x_step, y_step)
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167 super(PatrollingAlien, self).update(dt)
258
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168
235
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169 @classmethod
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170 def requires(cls):
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171 return [("name", "string"), ("position", "coordinates"),
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172 ("end_position", "coordinates")]
278
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173
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174
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175 class ChargingAlien(Enemy):
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176 # Simplistic charging of the protagonist
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177 is_moving = False
308
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178 enemy_type = 'B'
334
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179 health = 42
341
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180 enemy_damage = 20
334
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181 impulse_factor = 300
361
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182 reload_time = 0.2
278
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183
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184 def __init__(self, space, world, position, attack_range=100):
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185 super(ChargingAlien, self).__init__(space, world, position)
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186 self._range = attack_range
361
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187 self._last_fired = 0
278
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188
334
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189 def make_physics(self, space, position):
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190 body = make_body(100, pymunk.inf, position, 0.8)
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191 shape = pymunk.Circle(body, 30)
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192 shape.elasticity = 1.0
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193 shape.friction = 0.05
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194 shape.collision_type = COLLISION_TYPE_ENEMY
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195 return SingleShapePhysicser(space, shape)
278
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196
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197 def get_render_angle(self):
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198 # No image rotation when rendering, please.
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199 return 0
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200
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201 def get_facing_direction(self):
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202 # Enemies can face left or right.
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203 if - math.pi / 2 < self.angle <= math.pi / 2:
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204 return 'right'
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205 else:
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206 return 'left'
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207
333
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208 def update(self, dt):
278
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209 # Calculate the step every frame
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210 # Distance to the protagonist
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211 pos = self.physicser.position
278
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212 target = self.world.protagonist.get_shape().body.position
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213 if pos.get_distance(target) > self._range:
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214 # stop
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215 self.is_moving = False
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216 return
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217 self.is_moving = True
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218 dx = target.x - pos.x
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219 dy = target.y - pos.y
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220 self.set_direction(dx, dy)
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221 if self.lifetime - self._last_fired >= self.reload_time:
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222 FireEvent.post(pos, vec_with_length((dx, dy), ACID_SPEED),
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223 ACID_DAMAGE, COLLISION_TYPE_ENEMY)
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224 self._last_fired = self.lifetime
333
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225 super(ChargingAlien, self).update(dt)
278
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226
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227 @classmethod
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228 def requires(cls):
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229 return [("name", "string"), ("position", "coordinates"),
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230 ("attack_range", "distance")]