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 rocket_smoke_mutator(particle: arcade.LifetimeParticle):
particle.scale = arcade.lerp(
0.5, 3.0, particle.lifetime_elapsed / particle.lifetime_original)