def rocket_smoke_mutator(particle: arcade.LifetimeParticle):
particle.scale = arcade.lerp(
0.5, 3.0, particle.lifetime_elapsed / particle.lifetime_original)
# A Sprite's scale doesn't affect generated textures
# (ex: make_soft_circle_texture) or scale being animated over time.
# The fix below is copied from Sprite.update_animation().
# Bug may have been recorded here: https://github.com/pvcraven/arcade/issues/331
particle.width = particle._texture.width * particle.scale
particle.height = particle._texture.height * particle.scale
def _createWarpEffectEmitter(self) -> Emitter:
"""
Random particle textures
"""
texture0 = self._warpEffectTextures[0]
texture2 = self._warpEffectTextures[2]
e: Emitter = Emitter(
center_xy=self._centerPosition,
emit_controller=EmitterIntervalWithTime(DEFAULT_EMIT_INTERVAL, DEFAULT_EMIT_DURATION),
particle_factory=lambda emitter: LifetimeParticle(
filename_or_texture=randomChoice((texture0, texture2)),
change_xy=rand_on_circle((0.0, 0.0), PARTICLE_SPEED_FAST),
lifetime=DEFAULT_PARTICLE_LIFETIME,
scale=DEFAULT_SCALE
)
)
return e
def rocket_smoke_mutator(particle: arcade.LifetimeParticle):
particle.scale = arcade.lerp(
0.5, 3.0, particle.lifetime_elapsed / particle.lifetime_original)