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annotate nagslang/enemies.py @ 385:51deb78cae52

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Use a result object to get new drawables back to the area
author Stefano Rivera <stefano@rivera.za.net>
date Fri, 06 Sep 2013 23:58:15 +0200
parents 024304f6d068
children 866cdc74b26a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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329b3044ddef Much better facing renderers.
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1 import math
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2 import random
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3
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4 import pymunk
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5 import pymunk.pygame_util
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6 from pymunk.vec2d import Vec2d
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7
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8 from nagslang import render
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9 from nagslang.constants import (COLLISION_TYPE_ENEMY, COLLISION_TYPE_FURNITURE,
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10 ACID_SPEED, ACID_DAMAGE, ZORDER_MID)
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11 from nagslang.events import EnemyDeathEvent, FireEvent
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12 from nagslang.game_object import (GameObject, SingleShapePhysicser, Result,
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13 make_body)
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14 from nagslang.mutators import FLIP_H
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15 from nagslang.resources import resources
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16 from nagslang.utils import vec_with_length
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17
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18
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19 def get_editable_enemies():
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20 classes = []
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21 for cls_name, cls in globals().iteritems():
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22 if isinstance(cls, type) and issubclass(cls, Enemy):
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23 if hasattr(cls, 'requires'):
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24 classes.append((cls_name, cls))
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25 return classes
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26
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27
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28 def get_alien_image(enemy_type, suffix, *transforms):
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29 image_name = 'alien_%s_%s.png' % (enemy_type, suffix)
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30 return resources.get_image('creatures', image_name, transforms=transforms)
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31
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32
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33 class Enemy(GameObject):
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34 """A base class for mobile enemies"""
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35 zorder = ZORDER_MID
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36 enemy_type = None # Which set of images to use
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37 enemy_damage = None
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38 health = None
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39 impulse_factor = None
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40
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41 def __init__(self, space, world, position):
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42 super(Enemy, self).__init__(
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43 self.make_physics(space, position), self.make_renderer())
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44 self.world = world
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45 self.angle = 0
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46
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47 def make_physics(self, space, position):
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48 raise NotImplementedError
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49
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50 def make_renderer(self):
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51 return render.FacingSelectionRenderer({
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52 'left': render.TimedAnimatedRenderer(
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53 [get_alien_image(self.enemy_type, '1'),
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54 get_alien_image(self.enemy_type, '2')], 3),
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55 'right': render.TimedAnimatedRenderer(
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56 [get_alien_image(self.enemy_type, '1', FLIP_H),
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57 get_alien_image(self.enemy_type, '2', FLIP_H)], 3),
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58 })
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59
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60 def attack(self):
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61 raise NotImplementedError
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62
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63 @classmethod
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64 def requires(cls):
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65 return [("name", "string"), ("position", "coordinates")]
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66
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67 def hit(self, weapon):
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68 self.lose_health(weapon.damage)
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69
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70 def lose_health(self, amount):
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71 self.health -= amount
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72 if self.health <= 0:
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73 self.physicser.remove_from_space()
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74 EnemyDeathEvent.post(self.physicser.position, self.enemy_type)
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75
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76 def set_direction(self, dx, dy):
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77 vec = vec_with_length((dx, dy), self.impulse_factor)
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78 self.angle = vec.angle
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79 self.physicser.apply_impulse(vec)
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80
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81 def collide_with_protagonist(self, protagonist):
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82 if self.enemy_damage is not None:
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83 protagonist.lose_health(self.enemy_damage)
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84
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85 def collide_with_claw_attack(self, claw_attack):
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86 self.lose_health(claw_attack.damage)
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87
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88 def ranged_attack(self, range_, speed, damage, type_, reload_time):
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89 pos = self.physicser.position
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90 target = self.world.protagonist.get_shape().body.position
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91
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92 r = self.get_space().segment_query(pos, target)
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93 for collision in r:
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94 shape = collision.shape
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95 if (shape in (self.get_shape(), self.world.protagonist.get_shape())
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96 or shape.sensor):
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97 continue
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98 return
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99
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100 if not self.check_timer('reload_time'):
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101 self.start_timer('reload_time', reload_time)
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102 vec = Vec2d((target.x - pos.x, target.y - pos.y))
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103 if vec.length < range_:
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104 vec.length = speed
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105 FireEvent.post(pos, vec, damage, type_,
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106 COLLISION_TYPE_ENEMY)
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107
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108 def greedy_move(self, target):
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109 """Simple greedy path finder"""
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110 def _calc_step(tp, pp):
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111 if (tp < pp):
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112 step = max(-1, tp - pp)
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113 elif (tp > pp):
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114 step = min(1, tp - pp)
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115 if abs(step) < 0.5:
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116 step = 0
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117 return step
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118 x_step = _calc_step(target[0], self.physicser.position[0])
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119 y_step = _calc_step(target[1], self.physicser.position[1])
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120 return (x_step, y_step)
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121
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122 def random_move(self):
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123 """Random move"""
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124 x_step = random.choice([-1, 0, 1])
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125 y_step = random.choice([-1, 0, 1])
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126 return x_step, y_step
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127
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128 def update(self, dt):
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129 super(Enemy, self).update(dt)
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130 if self.health <= 0:
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131 return Result(remove=[self])
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132
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133
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134 class DeadEnemy(GameObject):
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135 def __init__(self, space, world, position, enemy_type='A'):
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136 body = make_body(10, 10000, position, damping=0.5)
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137 self.shape = pymunk.Poly(
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138 body, [(-20, -20), (20, -20), (20, 20), (-20, 20)])
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139 self.shape.friction = 0.5
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140 self.shape.collision_type = COLLISION_TYPE_FURNITURE
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141 super(DeadEnemy, self).__init__(
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diff changeset
142 SingleShapePhysicser(space, self.shape),
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143 render.ImageRenderer(resources.get_image(
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144 'creatures', 'alien_%s_dead.png' % enemy_type)),
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diff changeset
145 )
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146
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147 @classmethod
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148 def requires(cls):
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149 return [("name", "string"), ("position", "coordinates")]
305
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150
168
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151
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152 class PatrollingAlien(Enemy):
218
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153 is_moving = True # Always walking.
308
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154 enemy_type = 'A'
334
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155 health = 42
341
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156 enemy_damage = 15
334
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157 impulse_factor = 50
168
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158
277
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159 def __init__(self, space, world, position, end_position):
168
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160 # An enemy that patrols between the two points
277
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161 super(PatrollingAlien, self).__init__(space, world, position)
168
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162 self._start_pos = position
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163 self._end_pos = end_position
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164 self._direction = 'away'
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165
334
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166 def make_physics(self, space, position):
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167 body = make_body(10, pymunk.inf, position, 0.8)
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168 shape = pymunk.Circle(body, 30)
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169 shape.elasticity = 1.0
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170 shape.friction = 0.05
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171 shape.collision_type = COLLISION_TYPE_ENEMY
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172 return SingleShapePhysicser(space, shape)
168
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173
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174 def get_render_angle(self):
229
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175 # No image rotation when rendering, please.
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176 return 0
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177
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178 def get_facing_direction(self):
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179 # Enemies can face left or right.
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180 if - math.pi / 2 < self.angle <= math.pi / 2:
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181 return 'right'
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182 else:
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183 return 'left'
168
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184
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185 def _switch_direction(self):
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186 if self._direction == 'away':
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187 self._direction = 'towards'
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188 else:
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189 self._direction = 'away'
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190
333
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191 def update(self, dt):
168
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192 # Calculate the step every frame
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193 if self._direction == 'away':
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194 target = self._end_pos
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195 else:
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196 target = self._start_pos
368
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197 x_step, y_step = self.greedy_move(target)
168
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198 if abs(x_step) < 1 and abs(y_step) < 1:
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199 self._switch_direction()
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200 self.set_direction(x_step, y_step)
366
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201 self.ranged_attack(300, ACID_SPEED, ACID_DAMAGE, 'acid', 0.2)
385
51deb78cae52 Use a result object to get new drawables back to the area
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diff changeset
202 return super(PatrollingAlien, self).update(dt)
258
083053422a84 Added collision damage with enemies.
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parents: 235
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203
235
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204 @classmethod
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205 def requires(cls):
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206 return [("name", "string"), ("position", "coordinates"),
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207 ("end_position", "coordinates")]
278
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208
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209
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210 class ChargingAlien(Enemy):
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211 # Simplistic charging of the protagonist
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212 is_moving = False
308
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213 enemy_type = 'B'
334
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214 health = 42
341
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diff changeset
215 enemy_damage = 20
334
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diff changeset
216 impulse_factor = 300
278
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diff changeset
217
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218 def __init__(self, space, world, position, attack_range=100):
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219 super(ChargingAlien, self).__init__(space, world, position)
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220 self._range = attack_range
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diff changeset
221
334
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diff changeset
222 def make_physics(self, space, position):
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diff changeset
223 body = make_body(100, pymunk.inf, position, 0.8)
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224 shape = pymunk.Circle(body, 30)
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diff changeset
225 shape.elasticity = 1.0
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diff changeset
226 shape.friction = 0.05
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diff changeset
227 shape.collision_type = COLLISION_TYPE_ENEMY
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diff changeset
228 return SingleShapePhysicser(space, shape)
278
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parents: 277
diff changeset
229
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diff changeset
230 def get_render_angle(self):
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diff changeset
231 # No image rotation when rendering, please.
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232 return 0
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diff changeset
233
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diff changeset
234 def get_facing_direction(self):
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diff changeset
235 # Enemies can face left or right.
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parents: 277
diff changeset
236 if - math.pi / 2 < self.angle <= math.pi / 2:
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diff changeset
237 return 'right'
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diff changeset
238 else:
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diff changeset
239 return 'left'
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diff changeset
240
368
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diff changeset
241 def _calc_movement(self):
334
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diff changeset
242 pos = self.physicser.position
278
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diff changeset
243 target = self.world.protagonist.get_shape().body.position
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diff changeset
244 if pos.get_distance(target) > self._range:
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diff changeset
245 # stop
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diff changeset
246 self.is_moving = False
368
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diff changeset
247 return 0, 0
278
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diff changeset
248 self.is_moving = True
368
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diff changeset
249 dx, dy = self.greedy_move(target)
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diff changeset
250 return dx, dy
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diff changeset
251
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diff changeset
252 def update(self, dt):
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diff changeset
253 # Calculate the step every frame
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diff changeset
254 # Distance to the protagonist
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diff changeset
255 self.ranged_attack(300, ACID_SPEED, ACID_DAMAGE, 'acid', 0.2)
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diff changeset
256 dx, dy = self._calc_movement()
361
534eac55a178 ChargingEnemy spits acid
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parents: 358
diff changeset
257 self.set_direction(dx, dy)
385
51deb78cae52 Use a result object to get new drawables back to the area
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parents: 372
diff changeset
258 return super(ChargingAlien, self).update(dt)
278
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parents: 277
diff changeset
259
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diff changeset
260 @classmethod
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diff changeset
261 def requires(cls):
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262 return [("name", "string"), ("position", "coordinates"),
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diff changeset
263 ("attack_range", "distance")]
368
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diff changeset
264
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diff changeset
265
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266 class RunAndGunAlien(ChargingAlien):
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diff changeset
267 # Simplistic shooter
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diff changeset
268 # Move until we're in range, and then randomly
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diff changeset
269 impulse_factor = 90
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diff changeset
270 is_moving = True
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diff changeset
271
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diff changeset
272 def __init__(self, space, world, position, attack_range=100):
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diff changeset
273 super(RunAndGunAlien, self).__init__(space, world, position,
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diff changeset
274 attack_range)
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diff changeset
275 self.count = 0
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diff changeset
276 self._old_move = (0, 0)
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diff changeset
277
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diff changeset
278 def make_physics(self, space, position):
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diff changeset
279 body = make_body(10, pymunk.inf, position, 0.8)
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diff changeset
280 shape = pymunk.Circle(body, 30)
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diff changeset
281 shape.elasticity = 1.0
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diff changeset
282 shape.friction = 0.05
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diff changeset
283 shape.collision_type = COLLISION_TYPE_ENEMY
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diff changeset
284 return SingleShapePhysicser(space, shape)
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diff changeset
285
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diff changeset
286 def _calc_movement(self):
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diff changeset
287 pos = self.physicser.position
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diff changeset
288 target = self.world.protagonist.get_shape().body.position
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diff changeset
289 if pos.get_distance(target) < self._range:
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diff changeset
290 if self.count > 10:
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diff changeset
291 self._old_move = self.random_move()
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diff changeset
292 self.count = 0
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diff changeset
293 return self._old_move
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diff changeset
294 else:
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diff changeset
295 return self.greedy_move(target)
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diff changeset
296
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diff changeset
297 def update(self, dt):
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298 self.count += 1
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299 return super(RunAndGunAlien, self).update(dt)
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300
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301 @classmethod
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302 def requires(cls):
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303 return [("name", "string"), ("position", "coordinates"),
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304 ("attack_range", "distance")]